API9221

Car/Wall or USB Supply Input Lithium Battery Charger

with OVP USB Bypass and 10mA LDO

API9221

Document number: DS32204 Rev. 1 - 2

1 of 17

www.diodes.com

May 2010

© Diodes Incorporated

Description

The API9221 has two supply inputs for highly integrated

portable applications, enabling charging from a USB host,

wall adapter, or car adapter.

valid supply is connected to either VUSB or VDC. The higher

charge current option from VDC will take priority if both

supplies are connected. The host controller can control the

implements the constant current/constant voltage (CC/CV)

charge algorithm for Lithium based battery cells. The

connected cell will be charged to 4.2V with an accuracy of 1%

over the entire temperature range. The termination current is

The

maximum

charge

current

can

be

programmed

The API9221 comes with several protection features. To

prevent system damage, the VUSB pin uses over voltage

protection (OVP) at 5.4V, and the VDC OVP is at 6.9V. Above

these levels, the non-operating device is protected against

damage up to 28V. For control and system start-up the

API9221 has a current limited linear regulator.

To protect the chip against excessive power dissipation,

temperature monitoring is integrated, which folds back the

current to a safe level. As the temperature rises, this fold-back

begins at 125°C without completely interrupting charging.

Applications

•

Handheld Consumer Devices

•

Cell Phones, PDAs, MP3 Players

•

Handheld Test Equipment

•

Digital Still Cameras

•

Multimedia players

Pin Assignments

CHG

IMIN

PPR

IUSB

EN

VDC_LDO

USB_BYP

BAT

7

6

5

4

3

2

1

10

11

12

9

8

VUSB

VDC

DFN4030-12

Exposed Pad

( Top View )

GND

IVDC

Features

•

Linear Lithium Ion / Lithium Polymer charging IC

•

Supplied from USB host or car/wall adapter

•

Overvoltage protection USB: 5.4V, wall:6.9V

•

Supply inputs safe up to 28V

•

Fast charging with maximum current of 1.2A

•

Integrated linear regulator of 4.9V at 10mA with

current limit

•

Separate resistor-programmable charging

current for wall and USB

•

Resistor programmable end-of-charge

•

Current limit on USB bypass path

•

Indicator pins for charging and power present

•

Enable pin to enable host control charging

•

Reverse current protection

•

Thermal protection

•

DFN4030-12: 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

API9221

ON

OFF

VDC_LDO

EN

PPR

CHG

BAT

GND

USB_BYP

IMIN

IUSB

IVDC

To Battery

To MCU

USB_BYP

LDO Output

VDC

VUSB

USB Input

DC Input

I/O_VDD

I/O_VDD