Preliminary Data Sheet

April 2003

PSC1534 Lithium-Ion Linear Battery Charger

Features

s

Low external component count and small footprint

s

Charge termination indication and manual shut-

down using PROG pin

s

Programmable charge current: 200 mA to 800 mA

s

4.1 V or 4.2 V preset voltages

s

discharged batteries requires no additional exter-

nal components

s

Very low quiescent battery current during shut-

down and standby (charger removed)

s

Charger undervoltage lockout and battery over-

voltage lockout

s

Overcurrent/overtemperature protection

s

Low-profile (1 mm) SOT-23 package

Description

The PSC1534 is a constant-current/constant-voltage

Li-Ion battery charger controller that is functionally

equivalent and performance equivalent to the

includes automatic detection and trickle charging of

The PSC1534 allows charge current programming

on the PROG pin is proportional to the charging cur-

external A/D to monitor charging progress. A low bat-

tery drain (BAT pin) manual shutdown state can be

forced by floating the PROG pin. When the input sup-

current sleep mode, during which BAT input supply

current is <1

µA.

Applications

s

Any application that requires a compact, low-cost

solution for Li-Ion battery charging

Typical Application

Figure 1. 500 mA Li-Ion Battery Charger

Figure 2. PROG Pin Indicates Charge Status

5 V

3

2

3 k

Ω

4

1

µF

PROG

GND

DRIVE

BAT

PSC1534

1

6

5

FMMT549

SINGLE

Li-Ion

BATTERY

10

µF

+

10 k

Ω

To A/D

CHARGING

COMPLETE

CHARGING

BEGINS

0 V

1 V

2 V

3 V

4 V

5 V

1.5 V

CONSTANT

VOLTAGE

CONSTANT

CURRENT