Li+ Battery Charger and Low Dropout Linear Regulator Combo

Copyright

© ANPEC Electronics Corp.

Rev. A.3 - Sep., 2012

APL3207

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

Accuracy

Board Design

(RoHS Compliant)

Features

Applications

General Description

Simplified Application Circuit

The APL3207 combines a constant-current/constant-volt-

age linear single cell Li+ battery charger with a low drop-

out linear regulator. Both charger and linear regulators

can work independently. The small DFN-10 package and

low external component count make the APL3207 ideally

suit to portable applications.

The charger of APL3207 provides 0.7A charge current

with thermal regulation protection to optimize the board

design for compact size and typical thermal conditions.

When the junction temperature reaches the thermal regu-

lation threshold, the charger does not shut down but sim-

ply reduces the charge current. The charge current can

be programmed by connecting an external resistor from

the ISET pin to the GND. Using an external MOSFET to

disconnect the resistor from the ground shuts down the

charger, and reduces the input current down to 25

µA.

The APL3207 also has the STAT pin to indicate charge

status.

The LDO regulator of APL3207 can deliver up to 150mA

current and dropout voltage is only 200mV. The 4

µA low

quiescent current makes it ideally suit to battery-power

systems. The LDO regulator also has built-in current limit

and thermal shutdown protection.

Pin Configuration

8 STAT

BATT 2

GND 3

LDOIN 4

VIN 1

NC 5

6 LDOOUT

9 GND

7 LDOOUT

10 ISET

GND

(Bottom)

APL3207

DFN-10 3x3 Top View

VIN

ISET

STAT

BATT

LDOIN

LDOOUT

GND

USB/Adapter 5V

3.3V

Li+

Battery

BATT