RT9502

1

DS9502-02 April 2011

www.richtek.com

Features

Automatic Input Supplies Selection

18V Maximum Rating for AC Adapter

Integrated Selectable 100mA and 500mA USB

Charge Current

Internal Integrated P-MOSFETs

AC Adapter Power Good Status Indicator

Charge Status Indicator

Under Voltage Protection

Over Voltage Protection

Automatic Recharge Feature

Battery Temperature Monitoring

Small 10-Lead WDFN Package

Thermal Feedback Optimizing Charge Rate

RoHS Compliant and 100% Lead (Pb)-Free

Pin Configurations

Applications

Digital Cameras

Cellular Phones

Personal Digital Assistants (PDAs)

MP3 Players

Hand Held PCs

Ordering Information

General Description

The RT9502 is a fully integrated low cost single-cell Li-

Ion battery charger IC ideal for portable applications. The

RT9502 is capable of being powered up from AC adapter

and USB (Universal Serial Bus) port inputs. The RT9502

can automatically detect and select the AC adapter and

the USB port as the power source for the charger. The

RT9502 enters sleep mode when both supplies are

removed.

The RT9502 optimizes the charging task by using a control

algorithm including precondition mode, fast charge mode

and constant voltage mode. The charging task is

terminated as the charge current drops below the preset

threshold. The USB charge current can be selected from

preset ratings of 100mA and 500mA, while the AC adapter

charge current can be programmed up to 1A with an

external resister. The internal thermal feedback circuitry

regulates the die temperature to optimize the charge rate

for all ambient temperatures.

The RT9502 features 18V and 7V maximum rating voltages

for AC adapter and USB port inputs respectively. The other

features are under voltage protection, over voltage

protection for AC adapter supply and battery temperature

monitoring.

(TOP VIEW)

WDFN-10L 3x3

Linear Single Cell Li-Ion Battery Charger IC with

Dual Input Supply

Note :

Richtek products are :

RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

ACIN

USB

GND

BATT

TS

ISETA

ISETU

9

8

7

1

2

3

4

5

10

GND

CHG_S

PGOOD

EN

11

RT9502

Package Type

QW : WDFN-10L 3x3 (W-Type)

Lead Plating System

P : Pb Free

G : Green (Halogen Free and Pb Free)