RT9524

2

DS9524-01 April 2011

www.richtek.com

Function Block Diagram

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

VIN

The Input Power Source.

2

ISET

Charging Current Setting.

3, 7,

11 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected to

GND for maximum power dissipation.

4

LDO

LDO Output (4.9V). This pin provides 50mA output current.

5

IEOC

programmed by the ISET pin.

6

EN/SET

Enable and Operation Mode Setting.

8

CHGSB

Indicator Output for Charging Status.

9

PGB

Indicator Output for Power Status.

10

BATT

Battery Charge Current Output.

Typical Application Circuit

VIN

GND

RT9524

PGB

8

3, 7, 11(Exposed Pad)

10

1

9

BATT

CHGSB

LDO 4

+

Adapter or USB

BATT

BATT

ISET

2

IEOC

5

EN/SET 6

CC/CV/TR

Multi Loop

Controller

Logic

LDO

Current

Set Block

Current

Set Block

200k

Status

Switch

Well

Sleep

Mode

Block

OVP

UVLO

Base

VIN

IEOC

BATT

CHGSB

PGB

ISET

EN/SET

LDO

GND