LX2202

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

Copyright

© 2004

Rev. 1.0, 2005-03-18

2A Li-Ion Linear Charger and Power Control

TM

®

DESCRI PTI O N

The LX2202 Linear Battery Charger is a

multi-state (2 stage) Li-Ion battery charger

(Constant current / Constant voltage) that is

designed to minimize battery charge time

(even from current limited sources such as

USB) and provide a simplified interface to

control battery discharge.

LX2202 features up to 2A charging

current from an AC adapter and an isolated

battery topology to minimize charge time

from current limited sources such as USB.

A thermal control loop maintains a safe

operating temperature at all times.

The

LX2202

provides

a

seamless

complete battery interface. When the input

power source is removed, the LX2202

provides the discharge path for the battery

with extremely low discharge impedance.

This eliminates the need for external

discharge switch and voltage supervisors.

In USB mode, the LX2202 provides

three levels of current limit: 100mA,

500mA, and off.

The LX2202 (compared to the LX2201)

has improved charge and discharge mode

detection circuitry. A UVLO feature prevents

battery charging when VDD is less than 3.6V.

The LX2202 uses three resistors to

program the constant charge current level, for

setting the termination charge current, and for

varying the USB charge current limits.

LX2202 support two types of Li-Ion

battery chemistry; 4.1V and 4.2V through

logical input (VM pin). The LX2202

provides a charging status indicator.

The

LX2202

features

a

pre-charge

conditioning mode for batteries that have

been deeply discharged and also has a top off

charge mode for batteries that are left on the

charger for extended periods.

The LX2202 is available in a high power

4mm x 4mm, 20-pin MLP, surface mount

package.

KEY FEATUR ES

Up to 2A Charge Current

Internal Pass Element Can

Function as a Reverse Direction

Load Switch

USB Compliant Charging States

using optional USB input

Isolated Battery Topology

Full Capacity Charging

True Charge Indicator

Wall Supply Regulator Tolerance

5V + 10%

Topping Charge with Voltage

Monitoring Mode

Improved charge/discharge mode

detection circuitry

Small, High Power 20-lead MLP

package

Selectable Li-Ion Battery for 4.1V

or 4.2V Applications

APPLI C ATION S

Batteries up to 4AH Ratings (C/2)

Cell Phones

PDAs

Charging Cradles

Digital Cameras

Low Cost Single Li-Ion Cell Chargers

PRODUCT H I GHLIGHT

105k

2.55k

72.3k

2.49k

Charge

Indicator

VDD

USB

VDD

BAT

NU

BAT

CMP

VDD

VDD

BAT

B220

10µF

0.1µF

10µF

LX2202

To VDD

Wall Adapter

Main Internal

Power Bus

Power On/Off

State Select Truth Table

VID0

VID1

0

0

Switch open – charging

disabled.

Switch open – discharge

disabled.

0

1

Charging – USB high level if

Switch open – discharge

disabled.

1

0

Charging – USB low level if

Battery Discharging. MOSFET

fully enhanced with current

1

1

Charging – USB high level if

Battery Discharging. MOSFET

fully enhanced with current

PACKAGE ORDER I N FO

LQ

Plastic MLP

4x4mm 20-Pin

°C)

RoHS Compliant / Pb-free

-40 to 125

LX2202CLQ

Note: Available in Tape & Reel.

Append the letters “TR” to the part number.

(i.e. LX2202CLQ-TR)