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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger General Description
The AAT3686 BatteryManager is a member of AnalogicTech's Total Power Management ICTM (TPMICTM) product family. This device is a highly integrated single-cell lithium-ion/polymer battery charger IC designed to operate with USB port and AC adapter inputs. It requires the minimum number of external components. The AAT3686 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. Adapter charge current rates can be programmed up to 1.5A. In the absence of an adapter and with a USB port connected, the battery can also be charged by USB power. Depending on the USB port type, the AAT3686 charge current can be programmed for two separate levels up to 500mA. An optional Charge Reduction Loop is also built in to allow users to charge the battery with available current from a USB port, while keeping the port voltage regulated. USB charging is disabled when an adapter is present. Battery temperature and charge state are fully monitored for fault conditions. In the event of an over-voltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. Status monitor output pins are provided to indicate the battery charge status by directly driving two external LEDs. A serial interface output is available to report 22 various status states to a microcontroller. The AAT3686 is available in a Pb-free, thermallyenhanced, space-saving 16-pin 4x4mm TDFN package and is rated over the -40C to +85C temperature range.
AAT3686
Features
*
BatteryManagerTM
* * * *
* * * * * * * * *
USB Port/AC Adapter System Power Charger -- USB: Programmable to 500mA for USB Hi/Lo -- Adapter: Programmable to 1.5A Max 4.0V to 5.5V Input Voltage Range Adapter Present Indicator (ADPP# Pin) Adapter Presence Automatically Disables USB Charging High Level of Integration With Internal: -- Charging Devices -- Reverse Blocking Diodes -- Current Sensing Automatic Recharge Sequencing Digital Thermal Regulation in ADP Charge Charge Reduction Loop in USB Charge Battery Temperature Monitoring Full Battery Charge Auto Turn-Off Over-Voltage and Emergency Thermal Protection Power On Reset and Soft Start Serial Interface Status Reporting 16-Pin 4x4mm TDFN Package
Applications
* * * * * * Cellular Telephones Digital Still Cameras Hand-Held PCs MP3 Players Personal Data Assistants (PDAs) Other Lithium-Ion/Polymer Battery-Powered Devices
Typical Application
Enable USB Input USB Hi/Lo Select
USB USBSEL USBH RSETH RSETL USBL BAT TS CT CT C2 10F EN CHR
BATT+
AAT3686
BATT-
ADP Present ADP Input
RSET
ADPP# ADP ADPSET STAT1
GND
DATA STAT2
TEMP
Battery Pack
Serial Data
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Pin Descriptions
Pin #
1 2 3 4 5
AAT3686
Name
USB BAT ADP GND CHR
Type
In In/Out In Ground In/Out
Function
USB power supply input. Battery charging and sensing. Adapter input. Ground connection. Resistor divider to set USB voltage regulation for charge reduction mode. Leave this pin open for default 4.5V USB regulation point. Tie to USB pin to disable this function. Enable pin. Logic high enables the IC. Adapter present indicator. This pin is open drain until ADP pin reaches threshold. Connect to 10k NTC thermistor. Status report to microcontroller via serial interface, open-drain. Battery charge status indicator pin to drive an LED: active low, open-drain. Battery charge status indicator pin to drive an LED: active low, open-drain. Timing capacitor to adjust internal watchdog timer. Set maximum charge time for adapter powered trickle, CC, and CV charge modes. The watchdog timer only sets the timers for adapter battery charging; there is no timeout for the battery charging from the USB input. If timing function is not needed, terminate this pin to ground. When USB is present, use this pin to toggle between 100mA and 500mA limit. Connect resistor here to set charge current for low-current USB port. Connect resistor here to set charge current for high-current USB port. Use resistor at this pin to set adapter charging current. Exposed paddle (bottom); connect to GND directly beneath package.
6 7 8 9 10 11 12
EN ADPP# TS DATA STAT2 STAT1 CT
In Out In/Out In/Out Out Out In/Out
13 14 15 16 EP
USBSEL USBL USBH ADPSET
In In/Out In/Out In/Out
Pin Configuration
TDFN44-16 (Top View)
USB BAT ADP GND CHR EN ADPP# TS
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
ADPSET USBH USBL USBSEL CT STAT1 STAT2 DATA
2
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Absolute Maximum Ratings1
Symbol
VP VP VN TJ TLEAD
AAT3686
Description
USB, ADP Input Voltage, <30ms, Duty Cycle <10% USB, ADP Input Voltage, Continuous BAT, USBSEL, USBH, USBL, ADPSET, STAT1, STAT2, ADPP#, DATA, TS, CT, CHR, EN Operating Junction Temperature Range Maximum Soldering Temperature (at leads)
Value
-0.3 to 7.0 -0.3 to 6.0 -0.3 to VVP + 0.3 -40 to 150 300
Units
V V V C C
Thermal Information2
Symbol
JA PD
Description
Maximum Thermal Resistance Maximum Power Dissipation
Value
37 2.7
Units
C/W W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. 3686.2006.06.1.5
3
USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Electrical Characteristics1
VADP = 5V, TA = -25C to +85C, unless otherwise noted. Typical values are at TA = 25C. Symbol
Operation USB, ADP VADPP
AAT3686
Description
Conditions
Min
4.0 4.25 4.25
Typ
Max Units
5.5 4.7 4.7 V V V V mV mA A A
USB Port or Adapter Voltage Range Adapter Present Indicator Threshold Voltage VU_DSBL ADP Voltage Level to Disable USB Charging Under-Voltage Lockout VUVLO Under-Voltage Lockout Hysteresis IOP Operating Current ISLEEP Sleep Mode Current ILeakage Reverse Leakage Current from BAT Pin Voltage Regulation VBAT_EOC1 End of Charge Voltage Accuracy VBAT/VBAT EOC Voltage Tolerance VMIN Preconditioning Voltage Threshold VRCH Battery Recharge Voltage Threshold VUSB_CHR USB Charge Reduction Regulation VCHR CHR Pin Voltage Accuracy Current Regulation ICH Charge Current ICH/ICH Charge Current Regulation Tolerance VADPSET ADPSET Pin Voltage VUSBH USBH Pin Voltage VUSBL USBL Pin Voltage KIA Current Set Factor: ICHARGE/IADPSET KIUH Current Set Factor: ICHARGE/IUSBH KIUL Current Set Factor: ICHARGE/IUSBL Charging Devices RDS(ON)A Adapter Charging Transistor On Resistance RDS(ON)U USB Charging Transistor On Resistance
USB Present
4.5 4.5 3.0 150 0.75 0.3 1.0
Rising Edge CC Charge Current = 500mA VBAT = 4.25V VBAT = 4V, USB, ADP Pins Open 4.158 2.8 No Connection on CHR Pin 4.3 1.9 100 CC Mode CC Mode CC Mode
1.5 1.0
4.2 0.5 3.0 VBAT_EOC - 0.1 4.5 2.0
4.242 3.15 4.64 2.1 1500
V % V V V V mA % V V V
10 2.0 2.0 2.0 4000 2000 2000 0.2 0.4 0.25 0.5 0.35 0.65
VIN = 5.5V VIN = 5.5V

1. The AAT3686 output charge voltage is specified over the 0 to 70C ambient temperature range; operation over the -25C to +85C temperature range is guaranteed by design.
4
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Electrical Characteristics1
VADP = 5V, TA = -25C to +85C, unless otherwise noted. Typical values are at TA = 25C. Symbol Description Conditions Min Typ
1.6 0.4 1.6 ADPP# Pin Sinks 4mA CCT = 100nF, V_ADP = 5.5V CCT = 100nF, V_ADP = 5.5V CCT = 100nF, V_ADP = 5.5V STAT Pin Sinks 4mA 8.0 4.4 10 50 7.5 35 70 310 2.2 3 8 1.6 0.4 Status Request 200 50 20 90 110 85 145 80 330 15 2.3 10 90 350 2.4 0.4 0.4 25 3.0 3.0 0.4
AAT3686
Max
Units
V V V V V Minute Hour Hour V mA V % % % A mV V mV mA mA V V ns s kHz C C C C
Logic Control / Protection VUSBSEL(H) Input High Threshold VUSBSEL(L) Input Low Threshold VEN(H) Input High Threshold VEN(L) Input Low Threshold VADPP# Output Low Voltage TP Preconditioning Time Out (ADP mode only) Preconditioning and Constant Current Mode TC Time Out (ADP mode only) Constant Voltage Mode Time Out TV (ADP mode only) VSTAT Output Low Voltage ISTAT STAT Pin Current Sink Capability VOVP Over-Voltage Protection Threshold Pre-Charge Current ITK/ICHG Charge Termination Threshold Current ITERM/ICHG Charge Termination Threshold Current ITERM/ICHG Current Source from TS Pin TS Hot Temperature Fault TS Cold Temperature Fault DATA Pin Sink Current ADPP# Current Sink Capability Input High Threshold Input Low Threshold Status Request Pulse Width System Clock Period Data Output Frequency Thermal Loop Regulation Thermal Loop Entering Threshold Thermal Loop Exiting Threshold Over-Temperature Shutdown Threshold
For Adapter or USBH Mode For USBL Mode For Adapter or USBH Mode For USBL Mode Threshold Hysteresis Threshold Hysteresis DATA Pin is Active Low State ADPP# Pin is Active Low State
ITS TS1 TS2 I_DATA I_ADPP# VDATA(H) VDATA)(L) SQPULSE tPERIOD fDATA TREG TLOOP_IN TLOOP_OUT TOVSD
1. The AAT3686 output charge voltage is specified over the 0 to 70C ambient temperature range; operation over the -25C to +85C temperature range is guaranteed by design. 3686.2006.06.1.5
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
IFASTCHARGE vs. RSET
10000
AAT3686
Battery Voltage vs. Supply Voltage
4.242
IFASTCHARGE (mA)
4.221
VBAT (V)
1000
ADP USBL
USBH
4.200
ADP
4.179
100
USBH
10
1
10
100
4.158 4.5
4.75
5.0
5.25
5.5
RSET (k)
Supply Voltage (V)
Recharge Voltage vs. Temperature
4.140 4.130 4.120 4.110
End of Charge Voltage vs. Temperature
4.242
4.221
VRCH (V)
4.090 4.080 4.070 4.060 4.050 4.040 -50 -25 0 25 50 75 100
VBAT (V)
4.100
ADP USBH
ADP
4.200
4.179
USBH
4.158 -50
-25
0
25
50
75
100
Temperature (C)
Temperature (C)
Preconditioning Threshold Voltage vs. Temperature
3.05 3.04 3.03
Preconditioning Charge Current vs. Temperature
(ADPSET = 8.06k; USBH = 8.06k)
120 60
VMIN (V)
3.01 3.00 2.99 2.98 2.97 2.96 2.95 -50
USBH
ICH ADP (mA)
3.02
110
55
ICH USB (mA)
ADP
100 50
ADP
USBH
90 45
-25
0
25
50
75
100
80 -50 -25 0 25 50 75
40 100
Temperature (C)
Temperature (C)
6
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
Fast Charge Current vs. Temperature
(ADPSET = 8.0k; USBH = 8.06k)
1100 1080 1060 540 530 1.2 1.0
AAT3686
Charging Current vs. Battery Voltage
(Adapter; ADPSET = 8.06k)
ICH ADP (mA)
1040 1020 1000 980 960 940 920 900 -50 -25 0
USBH
520
ICH USB (mA)
510 500 490 480
0.8
ICH (A)
0.6 0.4 0.2 0.0 2.5 2.9 3.3 3.7 4.1 4.5
ADP
470 460 450 25 50 75 440 100
Temperature (C)
Battery Voltage (V)
Charging Current vs. Battery Voltage
(USBH; USBH = 8.06k)
600 500 400 300 200 100 0 2.5 120 100 80 60 40 20 0 3.0 3.5 4.0 4.5
Charging Current vs. Battery Voltage
(USBL; USBL = 40.2k)
ICH (mA)
ICH (mA)
2.5
3.0
3.5
4.0
4.5
Battery Voltage (V)
Battery Voltage (V)
Fast Charge Current vs. Supply Voltage
(Adapter; ADPSET = 8.06k)
1200
Fast Charge Current vs. Supply Voltage
(USBH; USBH = 8.06k)
600
VBAT = 3.3V
1000 800 600 400 200 0 4.0 4.5 5.0 5.5 6.0 500
VBAT = 3.3V VBAT = 3.5V VBAT = 3.9V
ICH (mA)
ICH (mA)
VBAT = 3.9V VBAT = 3.5V
400 300 200 100 0 4.0
4.25
4.5
4.75
5.0
5.25
5.5
5.75
6.0
Supply Voltage (V)
Supply Voltage (V)
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
Fast Charge Current vs. Supply Voltage
(USBL; USBL = 40.2k)
120
AAT3686
Fast Charge Current vs. Supply Voltage
(USBH; USBH = 8.06k)
600
VBAT = 3.5V
100 80 500
0C VBAT = 3.3V 70C 25C
300 200 100 0 4.4
ICH (mA)
60 40 20 0 4.0 4.5
VBAT = 3.9V
5.0
5.5
6.0
6.5
ICH (mA)
400
4.5
4.6
4.7
4.8
4.9
5.0
Supply Voltage (V)
Supply Voltage (V)
VIH vs. Supply Voltage
EN Pin (Rising)
1.4 1.3 1.2 1.1 1.4 1.3 1.2
VIL vs. Supply Voltage
EN Pin (Falling)
-40C
+25C
1.1
-40C
+25C
VIH (V)
VIH (V)
+85C
1.0 0.9 0.8 0.7 0.6 0.5 0.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
1.0 0.9 0.8 0.7 0.6 0.5 0.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
+85C
Supply Voltage (V)
Supply Voltage (V)
VIH vs. Supply Voltage
USBSEL (Rising)
1.4 1.3 1.2 1.1 1.4 1.3
VIL vs. Supply Voltage
USBSEL (Falling)
-40C
+25C
1.2 1.1
-40C
+25C
VIH (V)
0.9 0.8 0.7 0.6 0.5 0.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.4 5.8 6.0
VIH (V)
+85C
1.0
1.0 0.9 0.8 0.7 0.6 0.5 0.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
+85C
Supply Voltage (V)
Supply Voltage (V)
8
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
Adapter Mode Supply Current vs. ADPSET Resistor
0.80 0.70 0.60
USB VBUS (200mV/div) USB Charge Current (200mA/div) Charge Reduction Mode Activated
AAT3686
USB Charge Current vs. Time
(USBH; USBH = 8.06k)
IQ (mA)
0.50 0.40 0.30 0.20 0.10 0.00 1 10
Constant Current
Pre-Conditioning
USB Peripheral Current Consumption (200mA/div) 0 2 4 6 8 10
100
1000
ADPSET Resistor (k)
Time (sec)
Counter Timeout vs. Temperature
(CT = 0.1F)
10
CT Pin Capacitance vs. Counter Timeout
2.0 1.8
Counter Timeout (%)
8
Capacitance (F)
6 4 2 0 -2 -4 -6 -8 -10 -50 -25 0 25 50 75 100
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 2
Precondition Timeout
Precondition + Constant Current Timeout or Constant Voltage Timeout
4
6
8
10
Temperature (C)
Time (hours)
Temperature Sense Output Current vs. Temperature
88
TS Pin Current (A)
86 84 82 80 78 76 74 72 -50 -25 0 25 50 75 100
Temperature (C)
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Functional Block Diagram
Reverse Blocking
AAT3686
USB USBSEL USBH USBL CHR
Charge Reduction Loop
Current Compare
CV/ Precharge
Constant Current
Charge Control
UVLO
BAT
ADPSET ADP ADPP# STAT1 STAT2 DATA EN
Voltage Sense Charge Status
Current Compare
OverTemperature Protect
Reverse Blocking
80A
TS
Window Comparator
Serial Data
IC enable
Watchdog Timer
CT
GND
Functional Description
The AAT3686 is a highly integrated single-cell lithiumion/polymer battery charger IC designed to operate with USB port and AC adapter inputs, while requiring a minimum number of external components. The AAT3686 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. The adapter charge input constant current level can be programmed up to 1.5A for rapid charging applications. In the absence of a high current adapter input source, the AAT3686 can be powered from a USB port VBUS supply. Depending on the USB port type, the AAT3686 constant charge current can be externally programmed for two levels, USB high and USB low, for maximum constant current charge levels up to 500mA. Typically, the USB charge levels are set at 500mA and 100mA for the USBH and USBL modes; however, the user may program either mode to any level up to 500mA. The USBH/L mode has automatic Charge Reduction Loop control to allow users to charge the battery with limited available current from a USB port, while 10
maintaining the regulated port voltage. This system assures the battery charge function will not overload a USB port while charging if other system demands also share power with the respective port supply. The USB charge function is automatically disabled when an adapter input power source greater than 4.4V is present. Status monitor output pins are provided to indicate the battery charge status by directly driving two external LEDs. A serial interface output is available to report 22 various status states to a microcontroller. Battery temperature and charge state are fully monitored for fault conditions. In the event of an overvoltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. In addition to internal charge controller thermal protection, the AAT3686 also provides a temperature sense feedback function (TS pin) from the battery to shut down the device in the event the battery exceeds its own thermal limit during charging. All fault events are reported to the user either by the simple status LEDs or via the DATA pin function.
3686.2006.06.1.5
USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger
Charging Operation
Regardless of which charge input function is selected (i.e., either the adapter input or USB input), the AAT3686 has four basic modes for the battery charge cycle: pre-conditioning/trickle charge; constant current/fast charge; constant voltage; and end of charge (see Figure 1).
Preconditioning Trickle Charge Phase Charge Complete Voltage Regulated Current I = Max CC Constant Current Charge Phase Constant Voltage Charge Phase
AAT3686
Constant Current Mode Voltage Threshold
Trickle Charge and Termination Threshold
I = CC / 10
Figure 1: Current vs. Voltage Profile During Charging Phases.
Battery Preconditioning
Before the start of charging, the AAT3686 checks several conditions in order to assure a safe charging environment. The input supply must be above the minimum operating voltage, or under-voltage lockout threshold (VUVLO), for the charging sequence to begin. Also, the cell temperature, as reported by a thermistor connected to the TS pin from the battery, must be within the proper window for safe charging. When these conditions have been met and a battery is connected to the BAT pin, the AAT3686 checks the state of the battery. If the cell voltage is below the preconditioning voltage threshold (VMIN), the AAT3686 begins preconditioning the cell. The battery preconditioning trickle charge current is equal to the fast charge constant current divided by 10 (USBL divided by 2). For example, if the programmed fast charge current is 500mA, then the preconditioning mode (trickle charge) current will be 50mA. Cell preconditioning is a safety precaution for a deeply discharged battery and also aids in limiting power dissipation in the pass transistor when the voltage across the device is at the greatest potential.
threshold (VMIN). At this point, the AAT3686 begins the constant current fast charging phase. The fast charge constant current (ICC) amplitude is determined by the charge mode, ADP, USBH or USBL, and is programmed by the user via the RSET, RSETH, and RSETL resistors. The AAT3686 remains in constant current charge mode until the battery reaches the voltage regulation point, VBAT.
Constant Voltage Charging
The system transitions to a constant voltage charging mode when the battery voltage reaches the output charge regulation threshold (VBAT) during the constant current fast charge phase. The regulation voltage level is factory programmed to 4.2V (1%). Charge current in the constant voltage mode drops as the battery cell under charge reaches its maximum capacity.
End of Charge Cycle Termination and Recharge Sequence
When the charge current drops to 7.5% (35% for USBL) of the programmed fast charge current level in the constant voltage mode, the device terminates charging and goes into a standby state. The charger will remain in a standby state until the battery voltage decreases to a level below the battery recharge voltage threshold (VRCH). 11
Fast Charge / Constant Current Charging
Cell preconditioning continues until the voltage on the BAT pin exceeds the preconditioning voltage
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger
When the input supply is disconnected or drops below UVLO or EN = 0, the charger will automatically enter power-saving sleep mode. Consuming an ultra-low 0.3A in sleep mode, the AAT3686 minimizes battery drain when it is not charging. This feature is particularly useful in applications where the input supply level may fall below the battery charge or under-voltage lockout level. In such cases where the AAT3686 input voltage drops, the device will enter sleep mode and automatically resume charging once the input supply has recovered from its fault condition.
AAT3686
System Operation Flow Chart
Output Output ADPP ADPP
Yes
ADP Voltage Test ADP > VADPP No ADP ADP Loop Loop
ADP Power Select
Yes
UVLO V P > VUVLO No
Yes
Switch Switch On On No
USB Enable No USB Detect USBSEL > 0 Yes Timing
Sleep Sleep Mode Mode
Power On Power On Reset Reset
USB Low USB Low Current Loop Current Loop
Thermal Thermal Loop Loop Enable Enable No Device Temp. Monitor TJ > 110C Yes Thermal Loop Thermal Loop Current Current Reduction in ADP Reduction in ADP Charging Mode Charging Mode
USB High USB High Current Loop Current Loop Fault Conditions Monitor OV, OT No Yes
Shutdown Shut Down Mode Mode Recharge Test VRCH > VBAT Yes Battery Temp. Monitor VTS1 Expire
No
Charge Charge Safety Safety Timer Timer Set
Preconditioning Test VMIN > VBAT
No Current Phase Test VCH > VBAT Yes Current Current Charging Charging Mode Mode
No Voltage Phase Test IBAT> IMIN No Charge Charge Completed Completed USB Voltage USB Voltage Regulation Regulation Enable Enable Yes Voltage Voltage Charging Charging Mode Mode USB Loop USB Loop Current Current Reduction in USB Reduction in USB Charging Mode Charging Mode Yes No
USB Voltage Test VUSB < 4.5V
12
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Application Information
AC Adapter / USB System Power Charging
Adapter Mode In the adapter mode, constant current charge levels up to 1.5A can be programmed by the user. The AAT3686 system control will always select the adapter input over the USB supply input whenever adapter voltage is present on the ADP pin. The AAT3686 will operate from the adapter input over a 4.0V to 5.5V range. The constant current fast charge current for the adapter input mode is set by the RSET resistor connected between the ADPSET and ground. Refer to Table 1 for recommended RSET values for a desired constant current charge level. The presence of voltage on the adapter input is indicated by the ADPP# pin function. This indicator pin is an open drain and will pull the ADPP# pin low when voltage is detected on the ADP pin. The precise charging function in the adapter mode may be read from the DATA pin and/or status LEDs. Please refer to the Battery Charge Status Indication discussion in this datasheet for further details on data reporting. Thermal Loop Control Due to the integrated nature of the linear charging control pass device for the adapter mode, a special thermal loop control system has been employed to maximize charging current under all operation conditions. The thermal management system measures the internal circuit die temperature and reduces the fast charge current when the device exceeds a preset internal temperature control threshold. Once the thermal loop control becomes active, the fast charge current is initially reduced by a factor of 0.44. The initial thermal loop current can be estimated by the following equation: controls the system charge level; therefore, the AAT3686 will always provide the highest level of constant current in the fast charge mode possible for any given ambient temperature condition. Adapter Input Charge Inhibit and Resume The AAT3686 has an under-voltage lockout and power on reset feature so that the charger will suspend charging and shut down if the input supply to the adapter pin drops below the UVLO threshold. When power is re-applied to the adapter pin or the UVLO condition recovers and ADP > VBAT, the system charge control will assess the state of charge on the battery cell and will automatically resume charging in the appropriate mode for the condition of the battery. USB Mode The AAT3686 provides an input for intelligent USB charging. When no voltage is present on the adapter input pin, the charge controller will automatically switch to accepting power from the USB input. The USB charge mode provides two programmable fast charge levels up to 500mA each, USB high and USB low, USBH and USBL, respectively. The USBH or USBL modes may be externally selected by the USB select pin (USBSEL). USBSEL is internally pulled low through a 1M resistor. When the USBSEL pin is connected to a logic high level, the USBH level will be active. Conversely, when USBSEL is pulled to a logic low level (ground), the USBL level will be used for charging. Typically, USBH is set for 500mA and USBL is set for 100mA. However, these two USB charge levels may be user programmed to any level between 50mA and 500mA by selecting the appropriate resistor values for RSETH and RSETL. Refer to Table 1 for recommended RSETH and RSETL values for the desired USB input constant current charge levels. USB Charge Reduction In many instances, product system designers do not know the real properties of a potential USB port used to supply power to the battery charger. Typically, powered USB ports found on desktop and notebook PCs should supply up to 500mA. In the event a USB port being used to supply the charger is unable to provide the programmed fast charge current or if the system under charge must also share supply current with other functions, the AAT3686 will automatically reduce USB fast charge current to maintain port integrity and protect the host system. 13
AAT3686
ITLOOP = ICC * 0.44
The thermal loop control re-evaluates the circuit die temperature every three seconds and adjusts the fast charge current back up in small steps to the full fast charge current level or until an equilibrium current is discovered and maximized for the given ambient temperature condition. The thermal loop
3686.2006.06.1.5
USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger
AAT3686
ICC
50 75 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
ADP RSET (k)
N/A N/A 84.5 43.2 28.0 21.0 16.9 13.3 11.5 10.2 9.09 8.06 7.32 6.65 6.04 5.62 5.36
USBH RSET (k)
86.6 57.6 42.2 21.0 13.7 10.2 8.06 6.65 5.62 4.87 4.32 3.83 3.48 3.16 2.87 2.67 2.43
USBL RSET (k)
86.6 57.6 42.2 20.5 13.7 10.2 8.06 6.65 5.62 4.87 4.32 3.83 3.48 3.16 2.87 2.67 2.43
VUSB
USB
R11
1.025M
CHR
VCHR = 2.0V
825k
R12
Figure 2: Internal Equivalent Circuit for the CHR Pin.
Table 1: Resistor Values.
The USB charge reduction system becomes active when the voltage on the USB input falls below the USB charge reduction threshold (VUSBCHR), which is typically 4.5V. Regardless of which USB charge function is selected (USBH or USBL), the charge reduction system will reduce the fast charge current level in a linear fashion until the voltage sensed on the USB input recovers above the charge reduction threshold voltage. The USB charge reduction threshold (VUSBCHR) can be externally set to a value lower than 4.5V by placing a resistor divider network between VUSB and ground with the center connected to the CHR pin. The USB charge reduction feature can be disabled by connecting a 10k resistor from the CHR pin directly to the USB input pin (see Figure 2). The following equation can be used to approximate a USB charge reduction threshold below 4.5V:
USB Input Charge Inhibit and Resume The AAT3686 UVLO and power on reset feature will function when the USB input pin voltage level drops below the UVLO threshold. At this point, the charger will suspend charging and shut down. When power is re-applied to the USB pin or the UVLO condition recovers, the system charge control will assess the state of charge on the battery cell and will automatically resume charging in the appropriate mode for the condition of the battery.
Enable / Disable
The AAT3686 provides an enable function to control the charger IC on and off. The enable (EN) pin is active high. When pulled to a logic low level, the AAT3686 will be shut down and forced into the sleep state. Charging will be halted regardless of the battery voltage or charging state. When the device is re-enabled, the charge control circuit will automatically reset and resume charging functions with the appropriate charging mode based on the battery charge state and measured cell voltage.
VUSBCHR = 2.0V /
Where R11/R12 << 1M. 14
R12 R12 + R11
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Programming Charge Current
The fast charge constant current charge level for both adapter and USB input modes are programmed with set resistors placed between the ADPSET, USBH, and USBL pins and ground. The accuracy of the fast charge, as well as the preconditioning trickle charge current, is dominated by the tolerance of the set resistor used. For this reason, 1% tolerance metal film resistors are recommended for the set resistor function. Fast charge constant current levels from 50mA to 1.5A can be set by selecting the appropriate resistor value from Table 1. The RSET resistor should be connected between the ADPSET pin and ground. The USB input fast charge constant current charge control provides for two current set levels, USBH and USBL. The USBSEL pin is used to select the high or low charge current levels in the USB charge mode. When the USBSEL pin is pulled to a voltage level above the VUSBSEL(H) threshold, the USBH current level will be selected. Conversely, this pin should be pulled below VUSBSEL(L) to enable the USBL charge level. Typically, the two RSETH and RSETL resistors for the USBH and USBL functions are fixed for 500mA and 100mA USB fast charge levels. However, these two charge levels can be set to any level between 50mA and 500mA depending upon the system design requirements for a given USB charge application. Refer to Table 1 and Figure 3 for recommended RSETH and RSETL values.
AAT3686
Protection Circuitry
Programmable Watchdog Timer The AAT3686 contains a watchdog timing circuit for the adapter input charging mode. No watchdog timing functions are active for the USB input mode. Typically, a 0.1F ceramic capacitor is connected between the TC pin and ground. When a 0.1F ceramic capacitor is used, the device will time a shutdown condition if the trickle charge mode exceeds 25 minutes and a combined trickle charge plus fast charge mode of three hours. When the device transitions to the constant voltage mode, the timing counter is reset and will time out after three hours and shut down the charger (see Table 2). Mode
Trickle Charge (TC) Time Out Trickle Charge (TC) + Fast Charge (CC) Time Out Constant Voltage (VC) Mode Time Out
Time
25 minutes 3 hours 3 hours
Table 2: Summary for a 0.1F Used for the Timing Capacitor. The CT pin is driven by a constant current source and will provide a linear response to increases in the timing capacitor value. Thus, if the timing capacitor were to be doubled from the nominal 0.1F value, the time-out times would be doubled. If the programmable watchdog timer function is not needed, it can be disabled by connecting the CT pin to ground. The CT pin should not be left floating or un-terminated, as this will cause errors in the internal timing control circuit. The constant current provided to charge the timing capacitor is very small, and this pin is susceptible to noise and changes in capacitance value. Therefore, the timing capacitor should be physically located on the printed circuit board layout as closely as possible to the CT pin. Since the accuracy of the internal timer is dominated by the capacitance value, 10% tolerance or better ceramic capacitors are recommended. Ceramic capacitor materials, such as X7R and X5R type, are a good choice for this application.
10000
IFASTCHARGE (mA)
1000
ADP USBL
100
USBH
10
1
10
100
RSET (k)
Figure 3: IFASTCHARGE vs. RSET.
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Over-Voltage Protection An over-voltage event is defined as a condition where the voltage on the BAT pin exceeds the maximum battery charge voltage and is set by the overvoltage protection threshold (VOVP). If an over-voltage condition occurs, the AAT3686 charge control will shut down the device until voltage on the BAT pin drops below the over-voltage protection threshold (VOVP). The AAT3686 will resume normal charging operation after the over-voltage condition is removed. During an over-voltage event, the STAT LEDs will report a system fault, and the actual fault condition may be read via the DATA pin signal. Over-Temperature Shutdown The AAT3686 has a thermal protection control circuit which will shut down charging functions should the internal die temperature exceed the preset thermal limit threshold. Battery Temperature Fault Monitoring In the event of a battery over-temperature condition, the charge control will turn off the internal pass device and report a battery temperature fault on the DATA pin function. The STAT LEDs will also display a system fault. After the system recovers from a temperature fault, the device will resume charging operation. The AAT3686 checks battery temperature before starting the charge cycle, as well as during all stages of charging. This is accomplished by monitoring the voltage at the TS pin. This system is intended to use negative temperature coefficient thermistors (NTC), which are typically integrated into the battery package. Most of the commonly used NTC thermistors in battery packs are approximately 10k at room temperature (25C). The TS pin has been specifically designed to source 80A of current to the thermistor. The voltage on the TS pin that results from the resistive load should stay within a window from 335mV to 2.32V. If the battery becomes too hot during charging due to an internal fault, the thermistor will heat up and reduce in value, pulling the TS pin voltage lower than the TS1 threshold and the AAT3686 will signal the fault condition. If the use of the TS pin function is not required by the system, it should be terminated to ground using a 10k resistor.
AAT3686
Battery Charge Status Indication
The AAT3686 indicates the status of the battery under charge with two different systems. First, the device has two status LED driver outputs. These two LEDs can indicate simple functions such as no battery charge activity, battery charging, charge complete, and charge fault. The AAT3686 also provides a bi-directional data reporting function so that a system microcontroller can interrogate the DATA pin and read any one of 22 system states. Status Indicator Display Simple system charging status states can be displayed using one or two LEDs in conjunction with the STAT1 and STAT2 pins on the AAT3686. These two pins are simple switches to connect the LED cathodes to ground. It is not necessary to use both display LEDs if a user simply wants to have a single lamp to show "charging" or "not charging." This can be accomplished by using the STAT1 pin and a single LED. Using two LEDs and both STAT pins simply gives the user more information to the charging states. Refer to Table 3 for LED display definitions. The LED anodes should be connected to either VUSB or VADP, depending upon system design requirements. The LEDs should be biased with as little current as necessary to create reasonable illumination; therefore, a ballast resistor should be placed between the LED cathodes and the STAT1/2 pins. LED current consumption will add to the overall thermal power budget for the device package, so it is wise to keep the LED drive current to a minimum. 2mA should be sufficient to drive most low-cost green or red LEDs. It is not recommended to exceed 8mA for driving an individual status LED.
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AAT3686
Event Description
Charge Disabled or Low Supply Charge Enabled Without Battery Battery Charging Charge Completed Fault
STAT1
Off Flash1 On Off On
STAT2
Off Flash1 Off On On
Table 3: Status LED Display Conditions. The required ballast resistor value can be estimated using the following formulas: For connection to the adapter supply:
RB(STAT1/2) = VADP - VF(LED) ILED(STAT1/2)
Digital Charge Status Reporting
The AAT3686 has a comprehensive digital data reporting system by use of the DATA pin feature. This function can provide detailed information regarding the status of the charging system. The DATA pin is a bi-directional port which will read back a series of data pulses when the system microcontroller asserts a request pulse. This single strobe request protocol will invoke one of 22 possible return pulse counts which the microcontroller can look up based on the serial report table shown in Table 4. The DATA pin function is active low and should normally be pulled high to VADP or VUSB. This data line may also be pulled high to the same level as the high state for the logic I/O port on the system microcontroller. In order for the DATA pin control circuit to generate clean, sharp edges for the data output and to maintain the integrity of the data timing for the system, the pull-up resistor on the data line should be low enough in value so that the DATA signal returns to the high state without delay. If too small a pull-up resistor is used, the strobe pulse from the system microcontroller could exceed the maximum pulse time and the DATA output control could issue false status reports. A 1.5k resistor is recommended when pulling the DATA pin high to 5.0V on either VADP or VUSB inputs. If the data line is pulled high to a voltage level less than 5.0V, the pull-up resistor can be calculated based on a recommended minimum pull-up current of 3mA. Use the following formula:
Example:
RB(STAT1) =
5.5V - 2.0V = 1.75k 2mA
Note: Red LED forward voltage (VF) is typically 2.0V @ 2mA. For connection to the USB supply:
RB(STAT1/2) = VUSB - VF(LED) ILED(STAT1/2)
Example:
RB(STAT2) =
5.0V - 3.2V = 900 2mA
Note: Green LED forward voltage (VF) is typically 3.2V @ 2mA. The four status LED display conditions are described in Table 3.
RPULL-UP
VPULL-UP 3mA
1. Flashing rate depends on output capacitance. 3686.2006.06.1.5
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AAT3686
Number
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
DATA Report Status
Chip Over-Temperature Shutdown Battery Temperature Fault Over-Voltage Turn Off Not Used ADP Watchdog Time-Out in Battery Condition Mode ADP Battery Condition Mode ADP Watchdog Time-Out in Constant Current Mode ADP Thermal Loop Regulation in Constant Current Mode ADP Constant Current Mode ADP Watchdog Time-Out in Constant Voltage Mode ADP Constant Voltage Mode ADP End of Charging USBH Battery Condition Mode USBH Charge Reduction in Constant Current Mode USBH Constant Current Mode USBH Constant Voltage Mode USBH End of Charging USBL Battery Condition Mode USBL Charge End of Charging Reduction in Constant Current Mode USBL Constant Current Mode USBL Constant Voltage Mode USBL End of Charging Data Report Error
Table 4: Serial Data Report Table.
1.8V to 5.0V
IN
AAT3686 Status Control
OUT
RPULL_UP DATA Pin
GPIO
IN
OUT
P GPIO Port
Figure 4: Data Pin Application Circuit. Data Timing The system microcontroller should assert an active low data request pulse for minimum duration of 200ns; this is specified by the SQPULSE. Upon sensing the rising edge of the end of the data request pulse, the AAT3686 status data control will reply 18 the data word back to the system microcontroller after a delay defined by the data report time specification TDATA(RPT). The period of the following group of data pulses will be defined by the TDATA specification.
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Timing Diagram
AAT3686
SQ
SQPULSE System Reset System Start
PDATA
CK
TSYNC TLAT TOFF
Data
TDATA(RPT) = TSYNC + TLAT < 2.5 PDATA TOFF > 2 PDATA
N=1
N=2
N=3
Thermal Considerations
The AAT3686 is offered in a 4x4mm TDFN package which can provide up to 2.7W of power dissipation when it is properly bonded to a printed circuit board and has a maximum thermal resistance of 37C/W. Many considerations should be taken into account when designing the printed circuit board layout, as well as the placement of the charger IC package in proximity to other heat generating devices in a given application design. The ambient temperature around the charger IC will also have an effect on the thermal limits of a battery charging application. The maximum limits that can be expected for a given ambient condition can be estimated by the following discussion: First, the maximum power dissipation for a given situation should be calculated: Eq. 1: PD = [(VIN - VBAT) * ICC + (VIN * IOP)]
VBAT = Battery voltage as seen at the BAT pin ICC IOP = Maximum constant fast charge current programmed for the application = Quiescent current consumed by the charger IC for normal operation
Next, the maximum operating ambient temperature for a given application can be estimated based on the thermal resistance of the 4x4mm TDFN package when sufficiently mounted to a PCB layout and the internal thermal loop temperature threshold. Eq. 2: TA = TJ - (JA * PD)
Where: TA TJ PD JA = Ambient temperature in degrees C = Maximum device junction temperature below the thermal loop threshold = Total power dissipation by the device = Package thermal resistance in C/W
Where: PD VIN = Total power dissipation by the device = Either VADP or VUSB, depending on which mode is selected
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Example: For an application where the fast charge current for the adapter mode is set to 1A, VADP = 5.0V, and the worst case battery voltage is 3.0V, what is the maximum ambient temperature where the thermal limiting will become active? Given: VADP = 5.0V VBAT = 3.0V ICC IOP TJ JA = 1A = 0.75mA = 110C = 37C/W 1F to 22F is recommended. If the source supply is unregulated, it may be necessary to increase the capacitance to keep the input voltage above the under-voltage lockout threshold during device enable and when battery charging is initiated. If the AAT3686 adapter input is to be used in a system with an external power supply source, such as a typical AC-to-DC wall adapter, then a CIN capacitor in the range of 10F should be used. A larger input capacitor in this application will minimize switching or power bounce effects when the power supply is "hot plugged." Likewise, a 10F or greater input capacitor is recommended for the USB input to help buffer the effects of USB source power switching, noise, and input cable impedance. Output Capacitor The AAT3686 only requires a 1F ceramic capacitor on the BAT pin to maintain circuit stability. This value should be increased to 10F or more if the battery connection is made any distance from the charger output. If the AAT3686 is to be used in applications where the battery can be removed from the charger, such as in the case of desktop charging cradles, an output capacitor greater than 10F may be required to prevent the device from cycling on and off when no battery is present.
AAT3686
Using Equation 3, calculate the device power dissipation for the stated condition: Eq. 3: PD = (5.0V - 3.0V)(1A) + (5.0V * 0.75mA)
= 2.00375W
The maximum ambient temperature before the AAT3686 thermal loop becomes active can now be calculated using Equation 4: Eq. 4: TA = 110C - (37C/W * 2.00375W) = 35.86C
Printed Circuit Board Layout Considerations
For the best results, it is recommended to physically place the battery pack as close to the AAT3686 BAT pin as possible. To minimize voltage drops on the PCB, keep the high current carrying traces adequately wide. For maximum power dissipation of the AAT3686 TDFN package, the metal substrate should be solder bonded to the board. It is also recommended to maximize the substrate contact to the PCB ground plane layer to further increase local heat dissipation. Refer to the AAT3686 evaluation board for a good layout example.
= 35.86C
Therefore, under the stated conditions for this worst case power dissipation example, the AAT3686 will enter the thermal loop and lower the fast charge constant current when the ambient operating temperature rises above 35.86C.
Capacitor Selection
Input Capacitor In general, it is good design practice to place a decoupling capacitor between the VADP and VUSB pins and ground. An input capacitor in the range of
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AAT3686 Evaluation Board Schematic Diagram
AAT3686
Figure 5: AAT3686 Evaluation Board Component Side Layout.
Figure 6: AAT3686 Evaluation Board Solder Side Layout.
ON/OFF J1
3 2 1
Figure 7: AAT3686 Evaluation Board Assembly Layout.
USBSEL J2
3 2 1
HI D4 (b) USB BAV74LT1 D4 (a) BAV74LT1
LO
D3
RED LED
GREEN RED LED LED D2 D1
ADP
R9 4.99K
R7 4.99K U1
1 3 2
R8
R10
R6 R11 Open Open
4.99K 1K
AAT3686 USBSEL STAT2 STAT1 DATA USBH USBL ADPSET CT
12 13 10 11 9 15 14 16
USB ADP BAT EN CHR ADPP# TS
BAT
6 5 7
DATA SW1
C1 10F
C2 10F
C3 10F R12 R1 Open 10K
8
R3
R5
R4
C6
GND
4
8.06K 40.2K 8.06K Open (Optional) C5 0.1F
TS
CT
Figure 8: AAT3686 Evaluation Board Schematic Diagram.
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USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger
AAT3686 Evaluation Board Bill of Materials (BOM)
Quantity Description
2 2 1 1 3
AAT3686
Desig.
Footprint
Manufacturer
Mill-Max Phoenix Contact Phoenix Contact Hirose Electronic Co., Ltd. Murata
Part #
6821-0-0001-00-00-08-0 277-1274-ND 277-1273-ND H2959CT-ND 490-1717-1-ND
1
2 1 1 2 1 1 1 3 1 1 1
Test Pin TS, CT Conn Term Block USB, GND/ TBLOK2 2.54mm 2POS ADP, GND Conn Term Block BAT, TS, TBLOK3 2.54mm 3POS GND USB 2.0 Receptacle, USB USB-MINI-B 5POS Capacitor, Ceramic, C1, 2, 3 0805 10F 6.3V 10% X5R 0805 Capacitor, Ceramic, C5 0603 0.1F 25V 10% X5R 0603 Typical Red LED D1, D3 1206LED Typical Green LED D2 1206LED Switching Diode D4 a, b SOT23-3 Header, 3-Pin J1, 2 Header 2mm-3 RES 10k 1/16W R1 0603 5% 0603 SMD RES 8.06k 1/16W R3, 4 0603 1% 0603 SMD RES 40.2k 1/16W R5 0603 1% 0603 SMD RES 4.99k 1/16W R7, 8, 9 0603 1% 0603 SMD RES 1.0k 1/16W R10 0603 5% 0603 SMD Switch Tact 6mm SW1 Switch SPST H = 5.0mm AAT3686 USB Port/AC U1 TDFN44-16 Adapter Lithium-Ion/ Polymer Battery Charger
Murata
478-1244-2-ND
Chicago Miniature Lamp Chicago Miniature Lamp On Semi Sullins Panasonic/ECG Panasonic/ECG Panasonic/ECG Panasonic/ECG Panasonic/ECG ITT Industries/C&K Div AnalogicTech
CMD15-21SRC/TR8 CMD15-21SRC/TR8 BAV74LT1 6821-0-0001-00-00-08-0 P10KJTR-ND P9.76KHCT-ND P40.2KHTR-ND P4.99KHTR-ND P1.0KCGCT-ND CKN9012-ND AAT3686IXN-4.2
22
3686.2006.06.1.5
USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Ordering Information
Package
TDFN44-16
AAT3686
Marking1
PHXYY
Part Number (Tape and Reel)2
AAT3686IXN-4.2-T1
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
TDFN44-16
Index Area (D/2 x E/2) Detail "B"
4.00 0.05
3.30 0.05
0.3 0.10 0.16
0.375 0.125
0.075 0.075 0.1 REF Detail "A"
Top View
Bottom View
Pin 1 Indicator (optional)
7.5 7.5
+ 0.05 0.8 -0.20
0.229 0.051
Detail "B"
Option A: C0.30 (4x) max Chamfered corner Option B: R0.30 (4x) max Round corner
0.05 0.05
Side View Detail "A"
All dimensions in millimeters.
1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3686.2006.06.1.5
0.23 0.05
0.45 0.05
4.00 0.05
2.60 0.05
23
USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger
AAT3686
(c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech's standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 24
3686.2006.06.1.5

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