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19-3795; Rev 0; 8/05
KIT ATION EVALU ILABLE AVA
USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN
General Description
The MAX8606 complete 1-cell Li+ battery charge-management IC operates from either a USB port or AC adapter. It integrates a battery disconnect switch, current-sense circuit, PMOS pass element, and thermalregulation circuitry, while eliminating the external reverse-blocking Schottky diode, to create a simple and small charging solution. The charging sequence initiates from power-OK indication, through prequalification, fast-charge, top-off charge, and finally charging-complete indication for single-cell Li+ batteries. Charging is controlled using constant current, constant voltage, or constant die-temperature (CCCVCTJ) regulation for safe operation in handhelds. Two logic inputs (EN1 and EN2) select suspend mode, 100mA, 500mA, or 1A input current limits to suit USB requirements. Proprietary thermal-regulation circuitry limits the die temperature to +100C to prevent excessive heat on the system PC board. Additional safety features include an NTC thermistor input (THM) and internal timers to protect the battery. A 3.5V to 4.2V SYS output, in conjunction with the low-R DSON battery switch, powers the system even when the battery is deeply discharged or not installed. The IC also offers a +3.3V/500A output (VL), a charging status flag (CHG), and an input-supply detection flag (POK). The MAX8606 operates from a +4.25V to +5.5V supply and includes undervoltage lockout below +3.4V and overvoltage protection up to +14V.
Features
Small 3mm x 3mm Thermally Enhanced TDFN Package (0.8mm max height) USB-Compliant Suspend Mode (20A) Selectable 100mA, 500mA, and Up to 1A Input Current Limits USB or AC Adapter Input +6V to +14V Input Overvoltage Protection Input UVLO Below +4V Rising (3.5V Falling) Automatic Current Sharing Between Battery Charging and System Die Temperature Regulation (+100C) Prequal, Fast-Charge, and Top-Off Timers Low Dropout Voltage, 250mV at 0.5A NTC Thermistor Input Charge Status and Input-Supply Detection Flags
MAX8606
Ordering Information
PART MAX8606ETD+ TEMP RANGE -40C to +85C PIN-PACKAGE 14 TDFN 3mm x 3mm (T1433-1) TOP MARK AAF
Applications
Cellular Phones, Smartphones, PDAs Digital Cameras, MP3 Players USB Appliances, Charging Cradles and Docks
+Denotes lead-free package.
Typical Operating Circuit
Pin Configuration
GND TMR SETI SYS SYS EN1 EN2
USB/AC-ADAPTER OVP UP TO 14V
STATUS INDICATORS IN GND VL CONTROL CHG POK SYS 3.5V TO 4.2V
TOP VIEW
0.1F
14 13 12 11 10
9
8
MA8606
INPUT CURRENT SELECTION P STAND-ALONE
EN1 EN2 TMR SETI
BAT THM Li+
+
1 BAT
2 BAT
3 IN
4 VL
5 THM
6 CHG
7 POK
MAX8606
TDFN
________________________________________________________________ Maxim Integrated Products
1
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN MAX8606
ABSOLUTE MAXIMUM RATINGS
IN to GND .............................................................. -0.3V to +16V BAT, SYS, EN1, EN2, POK, CHG, TMR to GND.......-0.3V to +6V VL, SETI, THM to GND .............................................-0.3V to +4V SYS to BAT ...............................................................-0.3V to +6V VL to IN...................................................................-16V to +0.3V IN to BAT Current ...........................................................1.0ARMS IN to SYS Current ...........................................................1.0ARMS BAT to SYS Current ........................................................1.0ARMS BAT Short-Circuit Duration .........................................Continuous Continuous Power Dissipation (TA = +70C) 14-Pin 3mm x 3mm TDFN (derate 18.2mW/C above +70C).............................................................1454mW Operating Temperature Range ...........................-40C to +85C Junction Temperature Range ............................-40C to +150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 5.0V, VBAT = 3.3V, EN1 = EN2 = GND, RSETI = 23.58k, CVL = 0.1F, CSYS = 4.7F, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER IN IN Voltage Range IN Operating Voltage Range IN Undervoltage Threshold IN Overvoltage Threshold IN Supply Current IN to BAT Switch Leakage SYS SYS Regulated Voltage SYS Current Limit SYS Dropout Voltage (VIN - VBAT) SYS Load Regulation BAT BAT Regulation Voltage Maximum Charging Current EN1 = low, EN2 = low BAT Charging Current EN1 = low, EN2 = high EN1 = high, EN2 = low ISYS = 0mA ISYS = 50mA ISYS = 0mA ISYS = 250mA ISYS = 0mA ISYS = 375mA 675 450 IBAT = 0mA TA = +25C TA = -40C to +85C 4.18 4.16 1 87 95 45 475 225 712 337 750 500 mA 100 4.20 4.20 4.22 4.24 V A ISYS = 0mA, VBAT = 3.3V EN1 = low, EN2 = low VSYS = 3.3V EN1 = low, EN2 = high EN1 = high, EN2 = low ISYS = 400mA, VSYS = 3.3V, EN1 = low, EN2 = high ISYS = 1mA to 675mA, EN1 = high, EN2 = low 3.4 90 450 675 3.5 95 475 712 350 10 3.6 100 500 750 700 mV mV mA V (Note 2) VIN rising, 500mV hysteresis (typ) VIN rising, 100mV hysteresis (typ) Charging, IBAT = ISYS = 0mA Suspend, EN1 = EN2 = high, IVL = 0mA VIN = 14V, BAT = GND TA = +25C TA = +85C 0 4.25 3.9 5.6 4.0 5.8 1.2 20 0.1 0.5 14 5.50 4.1 6.0 3.0 40 10 V V V V mA A A CONDITIONS MIN TYP MAX UNITS
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 5.0V, VBAT = 3.3V, EN1 = EN2 = GND, RSETI = 23.58k, CVL = 0.1F, CSYS = 4.7F, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER CONDITIONS EN1 = low, EN2 = low, ISYS = 0mA BAT Prequal Current VBAT = 2.0V EN1 = low, EN2 = high, ISYS = 0 to 350mA EN1 = high, EN2 = low, ISYS = 0 to 575mA Soft-Start Time BAT Prequal Threshold BAT Dropout Voltage (VIN - VBAT) BAT Short-Circuit Current Limit BAT to SYS Switch RON BAT to SYS Switch Threshold Battery-Removal Threshold VBAT rising, 150mV hysteresis (typ) VBAT = 4.1V, IBAT = 400mA BAT = GND VBAT = 3.5V, VSYS = 3.4V, VIN = 0V BAT rising, 160mV hysteresis (typ) BAT rising, 210mV hysteresis (typ) VIN = 0V BAT Leakage Current VIN = 2.4V EN1 = high, EN2 = high VL VL Output Voltage VL Shutdown Voltage THM THM Internal Pullup Resistance THM Resistance Threshold, Hot THM Resistance Threshold, Cold THM Resistance Threshold, Disabled SETI EN1 = low, EN2 = low SETI Servo Voltage SETI Resistance Range POK POK Trip Threshold (VIN - VBAT) POK Voltage, Low POK Leakage Current, High 4.1V < VIN < 5.6V, VBAT = 4.1V IPOK = 5mA V POK = 6V TA = +25C TA = +85C VIN rising VIN falling 150 5 250 55 0.05 0.01 0.01 350 125 0.2 1 mV V A EN1 = low, EN2 = high EN1 = high, EN2 = low 17.68 0.28 1.4 2.1 23.58 35.36 k V 10% hysteresis 10% hysteresis 70% hysteresis 3.72 26.6 274 10 3.93 28.3 305 4.13 30.0 336 k k k IVL = 0 to 500A V EN1 = V EN2 = 5V 3.1 3.3 0 3.5 V V TA = +25C TA = +85C TA = +25C TA = +85C TA = +25C TA = +85C -10 3.4 4.5 70 2.9 MIN 87 TYP 95 95 95 1.5 3.0 200 95 50 3.5 4.75 0.1 0.1 0.1 0.1 0.1 0.1 +10 10 A 3.1 400 120 100 3.6 5.0 10 ms V mV mA m V V MAX 100 mA UNITS
MAX8606 MAX8606
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN MAX8606
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 5.0V, VBAT = 3.3V, EN1 = EN2 = GND, RSETI = 23.58k, CVL = 0.1F, CSYS = 4.7F, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER CHG Full-Battery Detection Current Threshold CHG Voltage, Low CHG Leakage Current, High EN1, EN2, TMR Logic Input Leakage Current Logic Input Low Voltage Logic Input High Voltage THERMAL LIMIT Thermal-Regulation Threshold Thermal-Regulation Gain TIMER Oscillator Accuracy Overvoltage Turn-On Delay Prequal Fault Timer Fast-Charge Fault Timer Top-Off Timer CHG Blinking Rate In fault state, 50% duty 1.68 24 112 140 800 30 480 30 2.10 2.52 36 168 kHz ms min min min Hz TJ to IBAT , TJ > +100C +100 -50 C mA/C 1.6 V TMR = V EN1 = V EN2 = 0 to 5.5V TA = +25C TA = +85C 0.01 0.01 0.4 1 A V V IBAT falling ICHG = 5mA V CHG = 6V TA = +25C TA = +85C 30 50 0.05 0.01 0.01 70 0.02 1 mA V A CONDITIONS MIN TYP MAX UNITS
Note 1: Specifications are 100% production tested at TA = +25C. Limits over the operating temperature range are guaranteed by design and characterization. Note 2: Guaranteed by undervoltage and overvoltage threshold testing.
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN
Typical Operating Characteristics
(VIN = +5V, VBAT = 3.6V, ISYS = 0, EN1 = 1, EN2 = 0, circuit of Figure 3, TA = +25C, unless otherwise noted.)
SUSPEND-MODE SUPPLY CURRENT vs. INPUT VOLTAGE
MAX8606 toc01 MAX8606 toc02
MAX8606 MAX8606
SUPPLY CURRENT vs. INPUT VOLTAGE
2.0 1.8 1.6 SUPPLY CURRENT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 2 4 6 8 10 12 14 INPUT VOLTAGE (V) VIN RISING VBAT = 3.3V VIN FALLING 100 90 80 SUPPLY CURRENT (A) 70 60 50 40 30 20 10 0 0
CHARGE CURRENT vs. BATTERY VOLTAGE
900 800 CHARGE CURRENT (mA) 700 600 500 400 300 200 100 0 14 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 VBAT (V)
MAX8606 toc03
1000
EN1 = 1 EN2 = 1 2 4 6 8 10 12
INPUT VOLTAGE (V)
CHARGE CURRENT vs. INPUT VOLTAGE
MAX8606 toc04
CHARGE CURRENT vs. INPUT VOLTAGE HEADROOM
MAX8606 toc05
BATTERY REGULATION VOLTAGE vs. TEMPERATURE
BATTERY REGULATION VOLTAGE (V) 4.23 4.22 4.21 4.20 4.19 4.18 4.17 4.16 4.15 -40 -15 10 TA (C) 35 60 85
MAX8606 toc06
1000 900 800 CHARGE CURRENT (mA) 700 600 500 400 300 200 100 0 0 2 4 6 8 10 12 VIN FALLING VIN RISING
1000 900 800 CHARGE CURRENT (mA) 700 600 500 400 300 200 100 0 VBAT = 4V
4.24
14
0
50 100 150 200 250 300 350 400 450 500 (VIN - VBAT) (mV)
VIN (V)
CHARGE CURRENT vs. AMBIENT TEMPERATURE
MAX8606 toc07
CHARGE CURRENT vs. AMBIENT TEMPERATURE
1000 900 CHARGE CURRENT (mA) 800 700 600 500 400 300 200 100 85 -40 -15 10 TA (C) VIN = 5.5V VBAT = 3.2V EN1 = 1 EN2 = 0 35 60 85 CONSTANT TJ REGULATION
MAX8606 toc08
600 550 CHARGE CURRENT (mA) 500 450 400 350 300 250 200 -40 -15 10 TA (C) 35 60 EN1 = 0 EN2 = 1
1100
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN MAX8606
Pin Description
PIN 1, 2 3 NAME BAT IN FUNCTION Battery Connection. The IC delivers charging current and monitors battery voltage using BAT. Connect both BAT outputs together externally. During suspend mode, BAT is internally connected to SYS. Supply Voltage Input. Connect IN to a 4.25V to 5.5V supply. Charging is suspended if VIN exceeds 6V. Bypass IN to GND with a 4.7F or larger ceramic capacitor. +3.3V Output Voltage and Logic Supply. VL is regulated to +3.3V and is capable of sourcing 500A to provide power for external circuits. Bypass VL to GND with a 0.1F or larger ceramic capacitor. VL is internally pulled to GND during suspend mode. Thermistor Input. Connect a 10k NTC thermistor from THM to GND in close proximity to the battery to monitor the battery temperature. The IC suspends charging when the temperature is outside the hot and cold limits. Connect THM to GND to disable the thermistor monitoring function. Charging Status Output. CHG is an open-drain output that goes low when the battery is charging. CHG goes high impedance when the charge current drops below 50mA (typ) and the battery voltage is 4.2V (typ). CHG is high impedance when the IC is in suspend mode. Power-OK Monitor. POK is an open-drain output that pulls low when a valid charging source is detected at IN. Timer-Selection Input. Drive TMR high to enable the microprocessor mode where the charge times are determined by an external device. Drive TMR low to use the internal prequal, fast-charge, and top-off timers. Charge-Current Selection Input. Drive EN_ high or low to select the charge current or to put the MAX8606 into suspend mode (see Table 1). Charge-Current Selection Input. Drive EN_ high or low to select the charge current or to put the MAX8606 into suspend mode (see Table 1). Ground. Connect directly to exposed paddle under the IC. Charge-Current Programming Input. Connect a resistor from SETI to GND to set the maximum charging current. RSETI must be between 17.68k and 35.36k. System Supply Output. SYS delivers up to 1ARMS to power an external system. Bypass SYS to GND with a 4.7F or larger ceramic capacitor. SYS is connected to BAT through an internal 50m switch when VBAT exceeds 3.5V or when the MAX8606 is in suspend mode. Exposed Paddle. Connect to GND under the IC. Connect to a large ground plane to improve power dissipation.
4
VL
5
THM
6 7 8
CHG POK TMR
9 10 11 12
EN2 EN1 GND SETI
13, 14
SYS
--
EP
Detailed Description
The MAX8606 charger uses current, voltage, and thermal control loops to charge and protect a single Li+ battery cell. It can start the system even when the battery is in deep saturation. The MAX8606 provides a SYS output that supplies the external system with a minimum 3.5V at 1A. Two active-low enable inputs (EN1 and EN2) are supplied to set the SYS and charging current limits. During prequal and fast-charge modes, the CHG output status flag is pulled low. As the battery voltage approaches
4.2V, the charging current is reduced. When the charging current drops below 50mA and the battery voltage equals 4.2V, the CHG output goes high impedance, signaling a full battery. At any time during charging, if both EN1 and EN2 are driven high, the charger enters suspend mode, charging stops, and CHG goes high impedance. The MAX8606 contains an internal timer to measure the prequal, fast-charge, and top-off charge time. If the battery voltage has not risen above 3V after 30 minutes or has not completed fast-charge in 8 hours, the charger goes into a fault state where the charging is
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN MAX8606 MAX8606 MAX8606
NOT READY POK = Hi-Z, CHG = Hi-Z, IIN = 0mA 4V < VIN < 5.8V AND VIN > VBAT AND EN1 OR EN2 = 0 SET TIMER = 0 PREQUAL POK = 0V, CHG = 0, IBAT = 100mA IIN ILIM VBAT < 2.9V SET TIMER = 0 VBAT > 3V SET TIMER = 0
VIN < 4V OR VIN > 5.8V OR VIN < VBAT
ANY STATE
4V < VIN < 5.8V AND VIN > VBAT AND EN1 = EN2 = 1
EN1 OR EN2 = 0 SET TIMER = 0
SUSPEND POK = 0, CHG = Hi-Z, IIN < 40A
TIMER > 30MIN AND TMR = 0 FAULT POK = 0, CHG = BLINK, IBAT = 0A TIMER > 8 HOURS AND TMR = 0 (TIMER SUSPENDED IN 100mA MODE)
FAST-CHARGE POK = 0, CHG = 0, VIN(MAX) = 4.2V, IIN(MAX) = ILIM ITOTAL < 50mA AND VBAT = 4.2V, SET TIMER = 0 ANY CHARGING STATE RTHM > 3.93k AND RTHM < 28.3k 305 < RTHM < 3.93k OR RTHM > 28.3k TOP-OFF POK = 0, CHG = Hi-Z, VIN(MAX) = 4.2V, IIN(MAX) = ILIM TIMER > 30min AND TMR = 0 TEMPERATURE SUSPEND IBAT = 0A POK = PREVIOUS STATE CHG = PREVIOUS STATE TIMER STOPPED DONE POK = 0, CHG = Hi-Z, IIN = 0A
VBAT < 4.06V
ILIM = 100mA, 500mA, OR UP TO 1A
Figure 1. MAX8606 State Diagram
suspended and the CHG flag turns on and off at 2Hz. Either the input power must be cycled or the suspend mode enabled to clear the fault.
EN1 and EN2 Inputs
EN1 and EN2 are logic inputs that enable the charger and select the charging current (see Table 1). Drive EN1 and EN2 high to place the IC in suspend mode.
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN MAX8606
SYS IN BODYDIODE CONTROL BAT
P
CHG EN1 EN2 CURRENT-LIMIT CIRCUITRY POK SETI THERMAL REGULATION THM COLD LOGIC CIRCUITRY
VL
THM
OVLO
THM HOT
UVLO OSCILLATOR
THM DISABLE
VL
VL LDO BIAS
PREQUAL FAST-CHARGE TOP-OFF TIMERS
TMR
MAX8606
GND
Figure 2. MAX8606 Block Diagram
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN
VL Internal Voltage Regulator
The MAX8606 linear charger contains an internal linear regulator to supply the power for the IC. Bypass VL to GND with a 0.1F ceramic capacitor. VL is regulated to 3.3V whenever the input voltage is above the battery voltage and can source up to 500A for external loads.
Table 1. EN1 and EN2 Control
EN1 0 0 1 1 EN2 0 1 0 1 100mA 500mA 8000 x 2.1V / RSETI Suspend MODE
MAX8606 MAX8606
CHG Charge-Indicator Output
CHG is an open-drain output that indicates charger status and can be used with an LED. CHG goes low during charging. CHG goes high impedance when VBAT equals 4.2V and the charging current drops below 50mA. When the MAX8606 is used in conjunction with a microprocessor (P), connect a pullup resistor between CHG and the logic I/O voltage to indicate charge status to the P. CHG also indicates a timer fault. If the internal prequal or fast-charge timer expires without completing the charge cycle, charging is suspended and the CHG output "blinks" at 2.1Hz.
the remaining available current goes to charge the battery. SYS is connected to BAT when VIN is not valid.
POK
The MAX8606 contains an open-drain POK output that goes low when a valid input source is detected at IN. A valid input source is one whose voltage is between 4V and 5.8V and exceeds the battery voltage by 250mV. After a valid input has been established, charging is sustained with inputs as low as 3.5V as long as the input voltage remains above the battery voltage by at least 55mV. POK is high impedance otherwise.
Soft-Start
To prevent input transients, the rate of change of the charge current is limited when the charger is turned on or changes its current compliance. It takes approximately 1ms for the charger to go from 0mA to the maximum fast-charge current.
Applications Information
Charge-Current Selection
For USB applications, the charging current is internally limited to 100mA or 500mA. For wall-cube applications requiring a different current requirement, set the charging current with an external resistor from SETI to GND (RSETI). Calculate RSETI as follows: RSETI = 8000 x 2.1V / (IBAT + ISYS) where EN1 = high and EN2 = low. The SETI input also enables the user to monitor the charging current. Under fast-charge operation, the SETI voltage regulates to 1.4V (EN1 low and EN2 high) or 2.1V (EN1 high and EN2 low). As the charging current decreases, VSETI decreases. This is due to either the thermal regulation control or voltage regulation control (4.2V) of the MAX8606. VSETI is calculated using the following equation: VSETI = (IBAT + ISYS) x RSETI / 8000
TMR Input
The MAX8606 includes a 30-minute prequalification fault timer, an 8-hour fast-charge fault timer, and a 30minute top-off timer to terminate the changing cycle. Drive TMR low to enable the internal timers. Drive TMR high to disable the internal timers and allow an external device to determine charge times.
THM Input
The MAX8606 monitors the battery temperature with an external NTC thermistor that is in close thermal contact with the battery. Select a thermistor resistance that is 10k at +25C and has a beta of 3500 Kelvins. The IC compares the resistance from THM to GND and suspends charging when it is greater than 28.3k or less than 3.93k, which translates to a battery temperature of 0C or +50C, respectively. Connect THM to GND to disable the temperature control function.
Thermal Regulation
The MAX8606 features a thermal limit that reduces the charge current when the die temperature exceeds +100C. As the temperature increases, the IC lowers the charge current by 50mA/C above +100C.
SYS Output
The MAX8606 contains a SYS output that delivers up to 1ARMS at 3.5V to 4.2V to power an external system. Bypass SYS to GND with a 4.7F or larger ceramic capacitor. When V BAT exceeds 3.5V or when the MAX8606 is in suspend mode, the MAX8606 internally connects SYS to BAT through a 50m switch. When charging a battery, the load on SYS is serviced first and
Capacitor Selection
Connect a ceramic capacitor from SYS to GND as close to the IC as possible for proper stability. Use a 4.7F X5R ceramic capacitor for most applications.
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN MAX8606
Connect a 4.7F ceramic capacitor from IN to GND as close to the IC as possible. Use a larger input bypass capacitor to reduce supply noise.
Thermal Considerations
The MAX8606 is available in a thermally enhanced TDFN package with exposed paddle. Connect the exposed paddle to a large copper ground plane to provide a good thermal contact between the device and the circuit board. The exposed paddle transfers heat away from the device, allowing the MAX8606 to charge the battery with maximum current while minimizing the increase in die temperature.
USB/AC-ADAPTER OVP UP TO 14V C1 4.7F IN GND VL MAX8606
VI/O D1 R2 1k CHG POK
STATUS INDICATORS R3 100k
C4 0.1F +3.5V TO +4.2V C2 4.7F
C3 0.1F
SYS EN1 EN2 TMR
DC Input Sources
The MAX8606 operates from well-regulated DC sources. The full-charging input voltage range is 4.25V to 5.8V. The device survives input voltages up to 14V without damage to the IC. If VIN is greater than 5.8V (typ), the IC stops charging. An appropriate power supply must provide at least 4.25V when sourcing the desired peak charging current. It also must stay below 5.8V when unloaded.
BAT THM T1 10k NTC 4.2V Li+
SETI R1 23.58k
Application Circuits
Stand-Alone Li+ Charger The MAX8606 provides a complete Li+ charging solution. Figure 3 shows the MAX8606 as a stand-alone Li+ battery charger. The 23.58k resistor connected to SETI sets a charging current of 712mA (typ). The LED indicates when either prequal or fast-charging has begun. When the battery is charged the LED turns off. USB Application with AC Adapter The MAX8606 can be configured for USB applications with an optional AC-adapter input (Figure 4). The pchannel MOSFET disconnects the USB port when the AC adapter is installed. Alternately, the USB port and AC adapter may be excluded from each other by mechanical means, such as using a single connector. USB-Powered Li+ Charger The universal serial bus (USB) provides a high-speed serial communication port, as well as power for the remote device. The MAX8606 can be configured to charge a battery at the highest current possible from the host port. Figure 5 shows the MAX8606 as a USB battery charger. To make the circuit compatible with either 100mA or 500mA USB ports, the system software begins at 100mA charging current. The microprocessor then enumerates with the host to determine its current capability. If the host port is capable, the charging current is increased to 475mA to avoid exceeding the 500mA USB specification.
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Figure 3. Stand-Alone Application
Layout and Bypassing
Place the input capacitor as close to the device as possible. Provide a large copper ground plane to allow the exposed paddle to sink heat away from the device. Connect the battery to BAT as close to the device as possible to provide accurate battery voltage sensing. Make all high-current traces short and wide to minimize voltage drops. A sample layout is available in the MAX8606 evaluation kit to help speed designs.
Chip Information
PROCESS: BiCMOS
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN MAX8606 MAX8606
+5V AC-ADAPTER INPUT VUSB +5V R3 10k VSYS CHG C2 0.1F VL POK C1 4.7F Q1 IRF7534D1 SYS C3 4.7F IN GND BAT 4.2V Li+ SYS LDO OUTPUT
MAX8606
THM
VI/O R2 100k C4 0.1F POWER-OK OUTPUT
EN1 SETI TMR R1 23.58k EN2
CHARGE-CURRENT SELECTION INPUTS
Figure 4. USB Application with AC Adapter
SYS VBUS GND C1 4.7F IN GND BAT C3 4.7F 4.2V Li+ VI/O THM R2 100k POK C2 0.1F USB PORT SETI TMR R1 23.58k R3 100k VL C4 0.1F SYSTEM
MAX8606
CHG
EN1 EN2 VI/O
D+ D-
Figure 5. USB Charger Application
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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Battery Switch in TDFN MAX8606
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
D2 D A2
N
PIN 1 ID
0.35x0.35 b
PIN 1 INDEX AREA
E DETAIL A
E2 e
[(N/2)-1] x e REF.
A1
k
C L
C L
A
L e e
L
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
G
1 2
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 MAX. 0.80 3.10 3.10 0.05
0.20 0.40 0.25 MIN. 0.20 REF.
PACKAGE VARIATIONS PKG. CODE T633-1 T633-2 T833-1 T833-2 T833-3 T1033-1 T1433-1 T1433-2 N 6 6 8 8 8 10 14 14 D2 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.700.10 1.700.10 E2 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 e 0.95 BSC 0.95 BSC 0.65 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEEC MO229 / WEED-3 ------b 0.400.05 0.400.05 0.300.05 0.300.05 0.300.05 0.250.05 0.200.05 0.200.05 [(N/2)-1] x e 1.90 REF 1.90 REF 1.95 REF 1.95 REF 1.95 REF 2.00 REF 2.40 REF 2.40 REF
DOWNBONDS ALLOWED
NO NO NO NO YES NO YES NO
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
G
2 2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
6, 8, &10L, DFN THIN.EPS

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