View SC805AMLTRT_4123291.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

POWER MANAGEMENT POWER MANAGEMENT Description Style Name _GreenBarText Description
SC805A Miniature Integrated High Current Lithium-Ion Battery Charger
Features Features
Fully integrated charger with FET pass transistor, Reverse-blocking diode, sense resistor and thermal protection High accuracy charge current* Tiny 3mm x 3mm 0-lead MLPD package Programmable pre-charge, fast-charge and termination current Battery voltage controlled to % accuracy Built-in timer for protection and complete charging NTC interface with battery detection Soft-start to reduce adapter in-rush current Up to A continuous charge current Input voltage range from 3V to 6V allows seamless charging from current limited adapter Applications Provides adapter voltage VCCIL to power external accessories Battery present detection and output indicator Operates in charger or LDO-Mode without battery 0.A battery drain current in shutdown and monitor modes Over-current protection in all charging modes CHRGB output communicates charging and end-of-charge cycle *US Patent 6,836,095
The SC805A is a fully integrated, single cell, constantcurrent (CC)/constant-voltage (CV) Lithium-Ion battery charger in a tiny 3x3 mm thermally enhanced lead-free MLP package. The SC805A can operate as a stand-alone charger or in conjunction with a Power Management Integrated Circuit (PMIC). The SC805A has a pre-charge function for trickle charging deeply discharged batteries. The fast-charge current is enabled automatically when the battery voltage reaches the required threshold. When the battery reaches the constant voltage or CV portion of the charge curve, the SC805A switches to CV regulation mode. In this mode the output current decays as the battery charges until the termination current is reached and the SC805A signals the charge cycle is complete. The SC805A can be configured to continue charging for a pre-determined time before turning off, or to turn off immediately upon termination. After turning off its output, the SC805A enters monitor mode. If the battery voltage drops by 00mV from the CV voltage a new charge cycle will begin. The timer function also protects against charging faulty batteries by turning off if the pre-charge time exceeds 1/4 of the total programmed charge duration. The SC805A also provides battery detection, and a battery NTC thermistor interface to disable charging when the battery temperature exceeds safe-to-charge limits. The SC805A can also function as a general purpose current source or as a current source for charging nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries.
Applications
Cellular Phones PDAs Handheld Meters Charging Stations USB Chargers Digital Cameras Programmable Current Source
Typical Application Circuit
SC805A CHARGER VIN
SC805A Typical Application Circuit
C1 1F
D1 LED
R2 3.01k
1 VCC VOUT 2 VCCIL CHRGB 7 EN/NTC ITERM 8 NOBAT IPRGM 9 RTIME GND
3 10 5 4 6 R4 3.01k
Charge Complete Indicator
D2 LED R5 3.01k
D3 LED
BATTERY
C1 R6 1k R7 1k 2.2F
Adapter Present Indicator
R1 3.01k
RT1 Thermistor
R3 39.2k
Charging Indicator
March 3, 2007
www.semtech.com
SC805A
POWER MANAGEMENT Absolute Maximum Rating
Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter VCC, VCCIL, EN/NTC to GND VOUT, NOBAT, IPRGM, CHRGB, ITERM, RTIME to GND Power Dissipation MLP (Derate 20mW/ C above 85C) Thermal Impedance, Junction to Case Junction Temperature Operating Ambient Temperature Range Peak IR Reflow Temperature, Soldering 20s-40s Storage Temperature Range VOUT Short to GND IVCCIL +IVOUT Total Output Current
Symbol
Maximum -0.3 to 7.0 -0.3 to +6.0
Units V V W C/W C C C C A A
PD JA TJ TA TPKG TSTG
2 40(1) 150 -40 to +85 260 -65 to 150 Continuous
IOUT_TOT
1
Notes: () Calculated from package in still air, mounted to 3" to 4.5", 4 layer FR4 PCB with thermal vias under the exposed pad per JESD5 standards.
Electrical Characteristics
Unless otherwise noted: VCC = 4.75V - 5.25V.
Parameter Input Voltage
Symbol
Condition Min
25C Typ 5 Max
TA (-40C to +85C) Min 3.5 Max 5.9 1 1.55 1 4.16 44 44.5 4.24 54
Units V A mA A V
ICCDIS Operating Current ICCCHG IleakBAT VBAT IPREQ
Shutdown Mode, EN = 0 Charging Mode CHRGB, ITERM, IPRG = 0A VCC = 0V Vbat load = 75mA
0.1 1.2 0.1 4.20 50
Battery Leakage Current Regulated Voltage Battery Pre-Charge Current Battery Termination Current
2007 Semtech Corp.
ITERM Resistor = 3.01k ITERMQ 50 53.6
mA
2
www.semtech.com
SC805A
POWER MANAGEMENT Electrical Characteristics (Cont.)
Parameter Battery Fast-Charge Current(1) Symbol Condition Min IFastQ1 IFastQ2 IPRGM = 15k IPRGM = 1.87k VBATTERY = 3.8V Dropout Voltage = 500mV Battery Fast-Charge Max Current Limit IProg Regulated Voltage ITerm Regulated Voltage Vin OVP Rising Threshold Vin OVP Falling Theshold Vin OVP Hysteresis Vin UVLO Rising Threshold Vin UVLO Falling Threshold Vin UVLO Hysteresis Vbat Pre-Charge Threshold Vbat Recharge Threshold Pre-Charge Fault Time-Out Charge Complete Time-Out Time Disable Threshold LDO-Mode Select Threshold VIPRGM VITERM VTOVPR VTOVPF VTOVPH VTUVLOR VTUVLOF VTUVLOH VTPREQR VTREQ TPQFAULT TFASTQ VTTIMER VTIINTTS VBAT - VBATTERY Rtime = 39.2k Rtime = 39.2k Rtime VIL Voltage VCC-Rtime Voltage 2.8V < VBATTERY < VBAT 1.5 1.5 6.8 6.4 375 2.8 2.75 50 2.8 100 38 2.5 1.0 1.1 2.5 30 2.7 60 30.7 2.0 0.7 0.7 2.9 140 44.7 3.0 1.42 1.42 6.4 5.9 150 3.5 3.25 1.0 1.58 1.58 7.5 7.15 A V V V V mV V V mV V mV min hrs V V 25C Typ 100 787 Max TA (-40C to +85C) Min 91.5 -5 Max 111.5 +5 mA % Units
2007 Semtech Corp.
3
www.semtech.com
SC805A
POWER MANAGEMENT Electrical Characteristics (Cont.)
Parameter Symbol VTDIS VTNTCH En-NTC Thresholds VTNTCC VTNOBAT NTCHYS Over-Temperature Shutdown OT VCBVOH CHRGB LED Output VCBVOL ICBOFF VNBVOH NOBAT Output INBOFF VCCIL Resistance Reduced Fast-Charge Current VCCILR lfqRed Condition Min SC805A Disable NTC Hot Vth Vcc = 5 NTC Cold Vth Vcc = 5 No Battery Detect, Vcc = 5 Hot/Cold Hysteresis Hysteresis = 10C Charge Complete Isrc = 2mA Charging Isnk = 2mA Disable or LDO-mode Off-leakage EN = VCC, Isrc = 1mA EN = VCC/2 Off-Leakage R VCC to VCCIL, 1 = 100mA Vout = 3.8V, Rprog = 1.87k, VCCIL Load = 200mA 25C Typ < 1.1 0.3VCC 0.75VCC 0.95VCC 50 150 4.5 0.2 0.1 4.8 0.1 0.2 585 545 625 4.5 1.0 4.3 0.05 5.0 0.5 1.0 Max TA (-40C to +85C) Min 0.7 0.294VCC 0.314VCC 0.736VCC 0.756VCC 0.93VCC 0.97VCC Max V V V V mV C V V A V A mA Units
Note: (1) Charge current is reduced by VCCIL current. VCCIL current is not limited by the IC.
2007 Semtech Corp.
4
www.semtech.com
SC805A
POWER MANAGEMENT Pin Configuration
Top View VCC VCCIL VOUT IPRGM ITERM 1 2 3 4 5 10 9 CHRGB RTIME NOBAT EN/NTC GND
Ordering Information
Device SC805AMLTRT(2) SC805AEVB Package(1) MLP-10 Evaluation Board
SC805A
T
8 7 6
Notes: () Only available in tape and reel packaging. A reel contains 3000 devices. (2) Lead-free product. This product is fully WEEE and RoHS compliant.
MLP-10 3mm x 3mm 10 Lead
Marking Information
805A yyww xxxx
Marking for the 3x3mm MLPD-10 Lead Package: nnnn = Part Number (Example: 805A) yyww = Datecode (Example: 0652) xxxx = Semtech Lot No. (Example: E901)
2007 Semtech Corp.
5
www.semtech.com
SC805A
POWER MANAGEMENT Block Diagram
VCC 1
Reference Voltages GND 6 Control NOBAT 8
Vout Ref Fast-Charge Ref Pre- Charge Ref VCCIL 2
Pre-Charge On Fast-Charge On Over-Temp Under-Voltage Over-Voltage
EN/NTC 7 RTIME 9 CHRGB 10
NTC Interface
Timer
VOUT 3 IPRGM 4 ITERM 5 Pre-Charge Ref
Fast-Charge Ref VOUT Vout Ref
2007 Semtech Corp.
6
www.semtech.com
SC805A
POWER MANAGEMENT Pin Descriptions (Cont.)
Pin 1 2 3 4 5 6 7 8 9 Pin Name VCC VCCIL VOUT IPRGM ITERM GND EN/NTC NOBAT RTIME Pin Function Supply pin - connect to adapter power Adapter input voltage - this pin provides a bias voltage approximately equal to the adapter input voltage. When charging, the output current will be reduced by the load current on VCCIL. Charger output - connect to battery Current limit program pin for charge and LDO-mode - requires a resistor to ground to program fast-charge current. Selection for current termination and pre-charge current - requires a resistor to ground to program pre-charge and termination current. Ground Combined device enable/disable and NTC input pin - logic low disables the device. Analog voltages between 0.3VCC and 0.75VCC enable the NTC function. Voltages above 95% of VCC force the NOBAT output high. Battery Present Indicator - this output goes high when the NTC voltage exceeds 95% of VCC indicating the battery and NTC have been removed. Charge time programming resistor - connect a resistor between RTIME and GND to program the charge time. Force the pin to GND to disable the timer. Force the pin to VCC to select LDO-mode. Output status indicator designed to drive two LEDs. Connect cathode of the `charging' LED to this pin to indicate charge in progress. Connect the anode of the `charge' completed to this pin to indicate charge complete. Pad is for heatsinking purposes - not connected internally. Connect exposed pad to ground plane with thermal vias directly under pad.
10 T
CHRGB Thermal Pad
2007 Semtech Corp.
7
www.semtech.com
SC805A
POWER MANAGEMENT Applications Information
General Operation The SC805A is configured based on the application for fastcharge and termination current, timing requirements, and operation with and without a battery (LDO mode). A typical charging cycle is described below. Details on alternate applications and output programmability are covered in the individual sections. The charging cycle begins when the adapter is plugged in. The SC805A performs glitch filtering on the VCC input and initiates a charge cycle when VCC > UVLO. At this time, the CHRGB signal is active low turning on the charging LED. If the battery voltage is less than 2.8V, the SC805A will charge the output with the pre-charge current. When the battery voltage exceeds 2.8V, the SC805A enters fast-charge or constant current (CC) mode. When the battery voltage reaches its final value, the charger enters the constant voltage (CV) mode. In this mode the output current decreases as the battery continues to charge until the termination current level is reached. The CHRGB pin goes high when VOUT output current is less than the programmed termination current, turning off the `charging' LED and turning on the `charge complete' LED. The SC805A continues to hold the battery in CV charge mode until the timer expires. At this point the charger enters the monitor mode where the output remains off until VOUT drops by 00mV and a new charge cycle is initiated. Pre-Charge Mode Pre-charge mode is automatically enabled whenever the battery voltage is below 2.8V. It is used to limit the power dissipation and precondition the battery for fast charging. The pre-charge current value is selected by the resistor on the ITERM pin. The pre-charge current is programmable from 0mA to 25mA. The equation to select the precharge current is given by:
PCI 1.5 RTERM 100
Fast-Charge Mode (CC) The fast-charge or CC mode is active when the battery voltage is above 2.8V and less than the CV or final float charge voltage of the battery. The fast-charge current can be set to a maximum of .0A and is selected by the program resistor on the IPRGM pin. The voltage on this pin will represent the current through the battery enabling a microprocessor via an analog-to-digital converter (ADC) to monitor battery current by sensing the voltage on the IPRGM pin. The equation to set the fast-charge current is given by:
FCI 1.5 RPRGM 1000
Note that for a given program resistor the current through the battery in CV mode can be determined by replacing .5 with the actual voltage on the IPRGM pin in the above equation. The superior fast-charge current accuracy of the SC805A is obtained by use of US patent 6,836,095 polarity-switched (i.e., chopped) current sense amplifier to nullify current measurement offset errors. Termination Current Once the battery reaches the program voltage of 4.2V the device will transition from a constant current source to a constant voltage source and the current through the battery begins to decrease while the voltage remains constant. When the current falls below the programmed termination current set by the termination resistor on the ITERM pin, the SC805A will transition the CHRGB pin from low to high. If the timer is enabled the output will continue to float charge in CV mode until the timer expires. If the timer is disabled than the output will turn off as soon as the termination current level is reached. If the part is in LDO mode the SC805A will remain on indefinitely at the regulated CV voltage. The equation to set the termination current is given by:
ITERM 1.5 RTERM 100
If the charge timer is in use there is also a maximum allowed pre-charge duration. If the pre-charge time exceeds 1/4 of the total charge cycle, the charger will turn off due to a pre-charge fault. This fault is cleared when EN or VCC is toggled or the output voltage rises above 2.8V.
2007 Semtech Corp.
8
www.semtech.com
SC805A
POWER MANAGEMENT Applications Information (Cont.)
Monitor Mode When a charge cycle is completed, the SC805A output turns off and the device enters monitor mode. If the voltage of the battery falls below the recharge threshold of CV-00mV the charger will clear the charge timer and re-initiate a charge cycle. The maximum current drain of the battery during monitor mode will be no more than A over temperature. The status of the charger output as a function of RTIME, and VOUT current is shown below.
Output State ON ON OFF ON OFF Rtime VCC R R Low Low Timer N/A T < Timer T > Timer Disabled Disabled VOUT current N/A N/A N/A > termination < termination
The NOBAT output can be used to signal the system that the battery has been removed, drive an external LED, or fed back to the SC805A to select LDO-mode. Connect the NOBAT pin to the RTIME pin to select LDO mode when the battery is removed and re-enable the output of the SC805A. LDO Mode The SC805A is designed to work with or without a battery. If the battery is not in place the device can enter LDO mode. In this mode the SC805A will act like a low dropout regulator. The input pin RTIME is used to select LDO mode. If RTIME is high the device will be in LDO mode. When LDO mode is selected and the EN-NTC pin is greater than 90% of VCC the output will be on in LDO mode. During LDO mode the device will regulate the output voltage with a current limit set by the resistor tied to the IPRGM pin. EN-NTC Interface The enable pin on the SC805A provides three functions: device disable, battery detection, and NTC temperature protection. It can be used to turn off the device by driving the pin to GND. It can also be connected to an external resistor divider consisting of a resistor and an NTC Thermistor to disable the charge cycle when the temperature is out of range. If the pin is pulled to VCC the SC805A will signal a `No Battery' condition on the NOBAT pin. Note: the SC805A will be disabled due to the NTC function when the `No Battery' condition is detected due to the NTC feature. The NTC temperature fault can be overridden to re-enable the output of the charger for no battery conditions as described in the NOBAT section of the datasheet. The NTC external component configuration is shown in the typical application schematic on Page of the datasheet. When the NTC voltage from the divider is above or below the cold and hot temperature threshold values, the SC805A will suspend the charge cycle by turning off the output, freezing the charge timer, and indicating a fault on the CHRGB LED. Hysteresis is included for both hot and cold thresholds to avoid chatter at the NTC trip points. When the temperature returns to the valid range, the SC805A will automatically resume the charge cycle. The charge timer will time-out when the SC805A output on-time exceeds the timer setting regardless of how long it has been disabled
Charge Timer The timer on the SC805A is used as protection in the case of a faulty battery and to maximize charging capacity. Connect a resistor from the RTIME pin to GND to select the desired charge time duration according to the following equation.
CHARGE TIME RTIME 39.2k 2.5HRS
The timer is programmable over the range of to 0 hours. To disable the charge timer, connect RTIME to GND. Driving the RTIME pin to VCC will disable the timer and select LDOmode operation for the SC805A. One implementation of this feature is discussed in the NOBAT operating section. The SC805A will automatically turn off the output when the charge timer times out. NOBAT Output The SC805A detects the absence of the battery by monitoring the voltage on the NTC pin. When the NTC pin voltage exceeds 95% of VCC, the NOBAT output is driven high. This function utilizes the standard NTC configuration with the NTC component residing in the battery pack. When the battery is removed the NTC element in the resistor divider is missing and the NTC voltage is pulled up to VCC.
2007 Semtech Corp.
9
www.semtech.com
SC805A
POWER MANAGEMENT Applications Information (Cont.)
due to the NTC temperature. The internal NTC thresholds of 30% and 75% VCC were designed to work with Curve-2 type thermistors available from numerous vendors. Design example based on the typical application schematic of Page using a Curve--2, Vishay-Dale NTC. Thot = 50C Tcold = 0C Find R2 and RT Step : Pick an RT value high enough to prevent selfheating.
RT 1 V(RT 1) DC
2
CHRGB LED Flag The CHRGB LED driver on the SC805A can be used to drive two external LEDs: CHRGB=Low (charging) and CHRGB=High (charge complete). The CHRGB output will be high impedance when the VCC is in a UV condition. The table below defines the CHRGB LED output states.
LED CHRGB High Iout < Iterm Low Iout > term High-Z VCC < UV Blinking Pre-charge OV or NTC Fault
The CHRGB output can be used for a VCC indicator. When the SC805A is enabled, the CHRGB output is either high or low providing the VCC input is above UVLO. The CHRGB output signifies the charging status. When the output current is greater than termination current, CHRGB=low. CHRGB is high when Iout is < Itermination. The CHRGB output is latched high at the end of the charge cycle when the output current is less than Itermination. The CHRGB output will remain high until the timer expires and Vbatt enters a re-charge cycle, or if EN, or VCC are toggled. The CHRGB indicator operates the same way in both charge and LDO mode. The CHRGB output can be used for a VCC indicator. When the SC805A is enabled the CHRGB output is either high or low providing the VCC input is above UVLO. Alternately an LED connected to VCCIL can be used for a VCC indicator as shown in the typical application schematic on Page . There are five fault modes detected by the SC805A; (input under-voltage, input over-voltage, NTC temperature, max die temperature (or OT) and pre-charge timeout). The LED states for these fault modes are shown below.
Fault VCC UVLO VCC OVP NTC Fault Pre-Charge Time-Out TJ > 150C CHRGB High-Z Blinking Blinking Blinking Blinking
In general, lower values of RT provide more noise immunity for the NTC voltage at the expense of bias current from the input adapter. The dissipation constant DC is the power rating of the NTC resulting in a C self-heating error. The DC value for this NTC is 3mW and the voltage across the NTC is 2.5V for a 5V adapter. Therefore, RT > 2K, Set RT = 0k Step 2: Find R2 to set the correct hot level trip point,
R2 2.33 RT25 RT50 RT25 9.52k
The closest standard resistor value is 9.53k. RT(temp)/ RT(25C) is often referred to as the ratio at the given temp. For this NTC at 50C, the ratio is 0.4086. Step 3: Calculate the Tcold value.
RTCOLD RT25 3 R2 10K 2.86
The ratio for the Curve-2 NTC at 0C is 2.86. The difference represents less than /2C (i.e., actual trip would be -0.5C instead of 0C.) For temperature trip values other than 0C and 50C, alternate curve-type NTC elements can be used or an additional resistor can be added to the Rntc divider to alter the temperature coefficient.
2007 Semtech Corp.
0
www.semtech.com
SC805A
POWER MANAGEMENT Applications Information (Cont.)
Over-Current and Max Temperature Protection Over-current protection is inherent in all modes of operation. When the device is in charge-mode the output is current-limited to either the pre-charge current limit value or the fast-charge current limit value depending on the voltage at the output. When the device is in LDO mode, the output current is limited to the fast-charge current limit. Max die temperature protection is included on the SC805A. This feature allows the SC805A to operate with maximum power dissipation by disabling the output current when the die temperature reaches OT. The result is that the SC805A will operate as a pulse charger in extreme power dissipation applications delivering the maximum allowable output current while regulating the internal die temperature to a safe level. Layout Guidelines The two most critical aspects of the PCB layout are the power path and thermal layout. The power path starts at the Adapter + input and runs to the VCC input of the SC805A, then from the VOUT pin of the SC805A to the Battery + terminal, and completes with the return trace from the battery - terminal to the adapter - input. All of these traces need to be designed to handle the required charging current. The trace from VOUT of the SC805A is most critical and should be made as wide as possible to minimize IxR drops between the regulated voltage at the SC805A VOUT pin and the battery terminal. Keep the Adapter+ to SC805A VCC input trace wide to minimize voltage drops that will add to the dropout voltage of the SC805A. The GND pin of the SC805A should be connected in a Kelvin fashion at the battery-terminal to eliminate voltage drops in the return path which reduce the regulated battery voltage. The thermal performance of the SC805A package requires a low impedance connection from the heat slug on the bottom of the package to an external ground plane. This is best accomplished by using a single large via under the device connected to a ground plane on the bottom exposed side of the PCB. The evaluation board uses square inch of copper on the bottom of the PCB and is capable of A charging current. The input and output bulk decoupling capacitors for the SC805A should be placed near the external terminals for the adapter and battery. This short low impedance loop is for the high current spikes that result from input/output hot-plugging of the charger. To minimize these current spikes the value of the decoupling capacitor should be minimized. A typical application requires a 0.F input/output capacitor. If the distance from the external terminals to the SC805A is greater than inch, 0.F local decoupling capacitors at the SC805A may be required.
2007 Semtech Corp.
www.semtech.com
SC805A
POWER MANAGEMENT Evaluation Board Schematic
Vout+ 1
R806 No Pop
R805 0
Charge Complete Indicator C2 1uF D1 LED R1 1k Charging Indicator D2 LED R2 1k R12 0
CHRGB VCCIL 1 D3
No Pop
R4 1e6 3 10 2 8 7 SC805A VCC VOUT CHRGB RTIME VCCIL ITERM NOBAT IPRGM EN-NTC GND R7 No Pop R8 No Pop 1 9 5 4 6
CHRG+ 1
1 EN-NTC 1
C1 2.2uF ITRM 1 RTIME 1
R3
No Pop
Adapter Present Indicator
NOBAT 1
IPGM 1 R9 3.01K
R6 3.01K VOUT1
R5 1e6
R10 3.01K
R11 40K
CHRG1
2007 Semtech Corp.
2
www.semtech.com
SC805A
POWER MANAGEMENT Typical Characteristics
Battery Charge Profile
CURRENT (Amps)
Pre-Charge Current
VOLTAGE (Volts)
4.4 4.2 4 3.8 3.6 3.4 3.2
0:00:00 0:12:30 0:25:00 0:37:30 0:50:00 1:02:30 1:15:00 1:27:30 1:40:00 1:52:30 2:05:00 2:17:30 2:30:00 2:42:30 2:55:00 3:07:30 3:20:00 3:32:30 3:45:00
0.6 0.5 0.4 0.3 0.2 0.1 0
3
VCHRGB voltage not to scale. Shown to indicate timing
TIME V CHARGE V CHRGB I CHARGE
900 800
Fast-Charge Current vs. Rprgm Value
Fast Charge Current
Pre-Charge/Termination Current vs. Rterm
90 80
Output Current (mA)
600 500 400 300 200 100
1870 2140 2500 3000 3750 5000 7500 15000 30000
Output Current (mA)
700
70 60 50 40 30 20 10
15000 30000 1870 2140 2500 3000 3750 5000 7500
0
0
Rpgrm Value ()
Rpgrm Value ()
9
Charge Timer vs. Rtime
140
0.25
Drop-out Voltage f(Iout)
Vdrop Rout
Fast-Charge Time-out (hrs)
7 6 5 4 3 2 1 0
Pre-Charge Time-out Fast-Charge Timeout
100 80 60 40 20
1E+05
Drop-out Voltage (V)
120
Pre-Charge Time-out (min)
0.2 0.15 0.1 0.05 0 100 250 500
0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25
15000
30000
50000
70000
90000
1E+05
0
Rtime ()
Output Current (mA)
2007 Semtech Corp.
3
www.semtech.com
Drop-out Resistance ()
8
0.75 0.7
SC805A
POWER MANAGEMENT Typical Characteristics (Cont.)
Fast-Charge Current Line Regulation f(Vin)
502 501 500 499 498 497 496 495 494 493 492 4.3 4.5 4.7 4.9 5.1 5.5 5.75 6 6.5
Fast Charge Current Fast Charge Error (%)
Fast-Charge Current Line Regulation f(Vin)
5.00% 4.00% 3.00% 501 500 5.00% 4.00% 3.00% 1.00% 0.00% -1.00%
Fast Charge Current Fast Charge Error (%)
Output Current (mA)
Percent Error (%)
1.00% 0.00% -1.00% -2.00% -3.00% -4.00% -5.00%
499 498 497 496 495
3.00 3.20 3.40 3.60 3.80 4.00 4.10 4.15 4.20
-2.00% -3.00% -4.00% -5.00%
Input Voltage VCC (V)
Output Voltage Vout (V)
Output Voltage Line Regulation f(Vin, Iout)
4.21 4.209 4.208 0.10% 0.08% 0.06% 0.02% 0.00% -0.02% -0.04%
Unloaded Vout Loaded Vout Unloaded Error (%) Loaded Error (%)
Output Voltage Load Regulation f(Iout)
4.211 4.21 0.00% -0.01% -0.02% -0.04% -0.05%
Loaded Vout Loaded Error (%)
Output Voltage (V)
Output Voltage (V)
Percent Error (%)
4.207 4.206 4.205 4.204 4.203 4.202 4.201 4.5
4.208 4.207 4.206 4.205 4.204
0 50 100 150 200 250 300 350 400 450 500
-0.06% -0.07% -0.08% -0.09% -0.10%
-0.06% -0.08% -0.10% 6.0 6.5
5.0
5.5
Input Voltage VCC (V)
Output Current (mA)
510.0 490.0
CC Current Limit, VCC < 4.2V
Pre-Charge Current Limit, Vcc < 4.2V
5.00% 0.00% 51.0 49.0 5.00% 0.00% -5.00% -10.00%
Pre-Charge Current % Error
Output Current (mA)
430.0 410.0 390.0 370.0
3.5
-10.00%
Fast-Charge Current % Error
-15.00% -20.00% -25.00%
43.0 41.0 39.0 37.0
3 4 3.5 4.5
-15.00% -20.00% -25.00%
4.5
5.5
3
4
5
5
Input Voltage VCC (V)
Input Voltage Vcc (V)
2007 Semtech Corp.
4
5.5
350.0
-30.00%
35.0
-30.00%
www.semtech.com
Percent Error (%)
450.0
Percent Error (%)
470.0
Output Current (mA)
-5.00%
47.0 45.0
Percent Error (%)
0.04%
4.209
-0.03%
Percent Error (%)
2.00%
Output Current (mA)
2.00%
SC805A
POWER MANAGEMENT State Diagram
Shutdown Mode Vout/Iout off CHRGB High Z
Under-Voltage will force the SC805A into Shutdown Mode from any state. Over-Voltage will disable the output, suspend the timer, and blink CHRGB.
OVP> Vin > UVLO
En=Hi Yes Soft Start Vout CHRGB Low CC=Constant Current CV=Constant Voltage
Soft Start CC Mode Iout=1500/Rprog
Timer Enabled? Yes Start Timer Start Pre -Charge Time=0
Vout=CV Yes Start CV Mode Timer Enabled? Yes Yes CHRGB High Yes Monitor Mode Vout=off Yes Vout< CV-100mV Yes Time>Tmax Time>Tmax IoutYes
Vout>2.8V Iout =150/Rterm Time>Tmax/4 Yes Pre - Charge Timeout Fault CHRGB blinks at 1Hz Cleared by Vbat >2.8V or Re - cycle EN or VCC 0o C > NTC Temp >50o C
IoutFloat Charge Mode Vout = CV
NTC out of Range Fault CHRGB blinks at 1Hz Timer is frozen Charge resumes when NTC Temperature is valid
2007 Semtech Corp.
5
www.semtech.com
SC805A
POWER MANAGEMENT Outline Drawing - MLPD-3x3-0
A
E
B
DIM
A A1 A2 b C D E e L N aaa bbb
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.039 .002 (.008) .009 .011 .079 .083 .048 .052 .118 .122 .020 BSC .012 .016 .020 10 .003 .004 .031 .000 .007 .074 .042 .114 1.00 0.05 (0.20) 0.23 0.30 2.02 2.12 1.21 1.31 3.00 3.10 0.50 BSC 0.30 0.40 0.50 10 0.08 0.10 0.80 0.00 0.18 1.87 1.06 2.90
E PIN 1 INDICATOR (LASER MARK)
A aaa C C 1 LxN 2 A1 C
SEATING PLANE
A2
D
N e bxN bbb CAB
NOTES:
1. 2.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.
2007 Semtech Corp.
6
www.semtech.com
SC805A
POWER MANAGEMENT Land Pattern - MLPD-3x3-0
K
DIM
G Y Z C G H K P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.112) .075 .055 .087 .020 .012 .037 .150 (2.85) 1.90 1.40 2.20 0.50 0.30 0.95 3.80
(C)
H
X P
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
2007 Semtech Corp. www.semtech.com
7

▲Up To Search▲

Price & Availability of SC805AMLTRT

	To Download SC805AMLTRT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .