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Details, datasheet, quote on part number:PSC1534-4.1
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Datasheet text preview:
Preliminary Data Sheet April 2003
PSC1534 Lithium-Ion Linear Battery Charger
Features
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Applications
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Low external component count and small footprint Charge termination indication and manual shutdown using PROG pin Programmable charge current: 200 mA to 800 mA 4.1 V or 4.2 V preset voltages Automatic trickle charging at IPROG/10 for heavily discharged batteries requires no additional external components Very low quiescent battery current during shutdown and standby (charger removed) Charger undervoltage lockout and battery overvoltage lockout Overcurrent/overtemperature protection Low-profile (1 mm) SOT-23 package
Any application that requires a compact, low-cost solution for Li-Ion battery charging
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Typical Application
VIN 5V 3 1 µF 10 k 2 ISENSE 1 FMMT549 IBAT = 500 mA + SI N G LE Li-I on BATTERY
VCC
PS C1534 6 GND DRIVE BAT 5
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To A/D
4 P RO G RPROG 3 k
10 µF
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Figure 1. 500 mA Li-Ion Battery Charger
5V VBAT (V)
Description
The PSC1534 is a constant-current/constant-voltage Li-Ion battery charger controller that is functionally equivalent and performance equivalent to the LTC ®1734. As an enhancement, the PSC1534 also includes automatic detection and trickle charging of deeply discharged batteries (VBAT <2.42 V). The PSC1534 allows charge current programming using a single external resistor, RPROG. The voltage on the PROG pin is proportional to the charging current at the ISENSE pin, allowing the user to use an external A/D to monitor charging progress. A low battery drain (BAT pin) manual shutdown state can be forced by floating the PROG pin. When the input supply (VIN) is removed, the PSC1534 enters a very lowcurrent sleep mode, during which BAT input supply current is <1 µA.
VBAT 4V 3V 2V 1. 5 V 1V 0V CONSTANT CURRE NT CONSTANT VOLTAGE VPROG
VPROG (V)
CHARGING BEGINS
CHARGING COMPLETE
Figure 2. PROG Pin Indicates Charge Status
PSC1534 Lithium-Ion Linear Battery Charger
Preliminary Data Sheet April 2003
Block Diagram
VIN 1 µF 3 1.5 V 2.15 V 2.5 V VCC
VOLTAGE
REFERENCE
IBAT/1000
90
IBAT
0.09 1 SHUTDOWN PNP DRIVER 6
ISENSE
+
OAI1 UVLO TEMP. LIMIT
CURRENT LIMIT
DRIVE FMMT529 IBAT
SHUTDOWN
2. 15 V
+
SHDN CMP SHUTDOWN
1.5 V OAI2 OAV1
2.5 V 5
BAT 10 µF SI N G LE Li-Ion CELL
3 µA
SHUTDOWN 4 PROG RPROG 2 GND
Figure 3. PSC1534 Block Diagram
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Agere Systems Inc.
Preliminary Data Sheet April 2003
PSC1534 Lithium-Ion Linear Battery Charger
Pin Information
TOP VIEW ISENSE 1 6 DRIVE
GND 2
5 BAT
VCC 3 TJMAX = 125 ºC, JA = 230 ºC/W
4 PROG
Figure 4. S6 Package, 6-Lead Plastic, 1 mm Thick, SOT-23 Table 1. Pin Descriptions Pin Number 1 2 3 Signal Name ISENSE GND VCC Type Output G ND Supply Description Charging current sense node. Supplies a monitored and controlled current from VCC to the PNP emitter. Ground reference for all internal circuits. Kelvin connects battery ground to GND to minimize battery top-off voltage error. Positive input supply for all internal circuits and external charging current (PNP emitter). The internal charging current control loop monitors and controls the current flow between VCC and ISENSE. Bypass this pin to GND with a 1 µF to 10 µF tantalum capacitor. Charge current programming pin. Use an external resistor, RPROG, to set current-mode charging current. ICHRG = 1.5 V/RPROG. If the voltage on PROG exceeds 2.15 V, the PSC1534 enters manual shutdown mode. This pin can be monitored by an external A/D converter. Battery voltage sense input. Bypass this pin with a 10 µF tantalum capacitor close to BAT and GND. Output base driver for PNP transistor. This driver output is current limited and monitored by an internal thermal shutdown circuit that will disable the driver if high-current fault conditions occur.
4
PROG
I/O
5 6
BAT DRIVE
I/O Output
Agere Systems Inc.
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