APM8601

DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY

CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE

TIMER

APM8601

Document number: DS35138 Rev. 1 - 2

1 of 14

www.diodes.com

December 2010

© Diodes Incorporated

Description

The APM8601 is a dual input channel linear Li-Ion charger for

portable equipment that is optimized for small form-factor

applications.

The charge algorithm in the APM8601 covers all the charge

requirements for a single Li-Ion battery cell. Included is

pre-charging for deeply discharged cells, constant current /

constant voltage fast charging and a top-off feature to bring

the cell safely to a full-charge level.

The battery is constantly monitored for overvoltage, charge

time and cell temperature to ensure safe charging. A fault is

triggered once the charge time exceeds a value that is

programmable using a single capacitor and the temperature

measurement is achieved through a thermistor positioned

close to the battery cell.

The APM8601 automatically selects the USB or DC input,

depending on which is valid (DC has priority if both are valid).

The charging current from the USB input is set to 100mA or

500mA based on the logic level of the USEL input.

The APM8601 is packaged in U-DFN3030-14 package with a

thermal pad.

Applications

•

Handheld Consumer Devices

•

Cell Phones, PDAs, MP3 Players

•

Handheld Test Equipment

•

Digital Still Cameras

•

Multimedia players

Pin Assignments

Figure 1. Pin Out

Features

•

Linear Lithium Ion / Lithium Polymer charging IC

•

Supply input safe up to 28V

•

Fast charging with maximum current of 1A

•

100mA/500mA USB charge current selected with USEL

•

Resistor-programmable charging current

•

Resistor programmable end-of-charge

•

Capacitor programmable charge timer

•

Three charge indicator pins for a status display

•

Thermal protection

•

DFN3030-14: Available in “Green” Molding Compound

(No Br, Sb)

•

Lead Free Finish/ RoHS Compliant (Note 1)

Note 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions

applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit

Figure 2. Typical Application Circuit