RT9501A/B

Preliminary

1

DS9501A/B-03P

October 2004

Features

For Single Lithium-Ion or Lithium-Polymer Cell

Battery Pack (4.1V or 4.2V)

A Few External Components are Required

Precharge, Constant Current, Constant Voltage

Modes

Battery Temperature Monitor

Charge Status Indication

Automatic Battery Recharge

Charge Termination Detect

Auto Low Power Sleep Mode when VDD Power is

Removed

MSOP-8 Package

Pin Configurations

Advanced Lithium-Ion Linear Battery Charger

Ordering Information

General Description

The RT9501 is a single Lithium-Ion or Lithium-Polymer

cell linear battery charger which is designed for compact

and cost-sensitive handheld devices. It combines charge

status indication, charge termination, battery temperature

monitoring, and high accuracy current and voltage

regulation in a MSOP-8 package.

The RT9501 charges the battery in three modes,

precharge, constant current, constant voltage. If the

the RT9501 precharges the battery with a lower

conditioning current. After precharge, the RT9501 applies

a constant current to the battery. An external sense-

resister sets the charge current. The constant voltage

mode continues until the battery reaches the regulation

voltage.

The battery temperature is continuously measured by an

external thermistor through the TS pin. The RT9501

inhibits charge until the temperature is within the range

defined by users.

Applications

Digital Cameras

PDAs

Cellular Phones

Information Appliance

(TOP VIEW)

MSOP-8

1

5

6

7

8

4

3

2

VDD

BATT

CS

FB/CE

CC

GND

STAT

TS

Marking Information

For marking information, contact our sales representative directly or through a RichTek distributor located in your area,

otherwise visit our website for detail.

RT9501

Package Type

F : MSOP-8

Voltage Version

A : 4.1V

B : 4.2V

Operating Temperature Range

C : Commercial Standard

P : Pb Free with Commercial Standard

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