LX2201

Microsemi

Integrated Products Division

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

Page 1

Copyright

© 2000

Rev. 1.2b, 2005-04-13

USB Li-Ion Battery Charger

TM

®

DESCRI PTI O N

The LX2201 Linear Battery Charger is a

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

(Constant current / Constant voltage) that

can supply up to 2A of charging current into

a single cell Li-Ion battery.

LX2201 is a cost effective , high perfor-

mance USB battery charger. The LX2201

features a 2A high charge current, with

automatic power savings using isolated

battery topology, user programmability in

USB charging, and an extended battery life

In

USB

mode,

the

LX2201

has

advantages over competition chargers with

the USB Limit Control circuit and low

Control circuit allows simultaneous battery

charging while the device is in operation.

transient.

The LX2201 is a low cost, highly

integrated battery charger solution. . It only

requires three external resistors: one for

setting the constant charge current level, one

for setting the termination charge current,

in thermostat that will throttle back the

charge current to keep the die temperature

from exceeding 150°C; this feature insures

the LX2201 delivers the maximum charge

rate for a given thermal environment.

LX2201 support two types of Li-Ion

battery chemistry; 4.1V and 4.2V through

logical input (VM pin).. A high accuracy

current sensing circuit allows batteries to

be fully charged before terminating the

charge

cycle.

The

LX2201

design

enhances system battery life by avoiding

premature discharge of Li-Ion battery with

a separate battery terminal voltage from

system load when adaptor charging is used,

i.e. trickle charge.

The LX2201 provides a charging status

indicator. The integrated PMOS pass element

features low drop out voltage while providing

an inherent load disconnect with virtually no

drain on the battery when disabled or when

the input power is removed. Additionally a

battery load disconnect switch has been

integrated which provides seamless power

switching when transitioning between charge

and discharge modes.

The

LX2201

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 LX2201 is available in a high power

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

package.

KEY FEATUR ES

2A Charge Current

USB Compliant Charging States

Power Saving and Conditional

Mode for Deep Discharge

Selectable Li-Ion Battery for 4.1V

or 4.2V Applications

Internal Pass Element Can

Function as a Reverse Direction

Load Switch

No Sense Resistor Required

Full Capacity Charging

True Charge Indicator

Wall Supply Regulator Tolerance

5V + 10%

Built In MOSFET Driver For Easy

AC Adapter/USB Implementation

Topping Charge with Voltage

Monitoring Mode

Inherent Load Disconnect

Small, High Power 20-lead MLP

package

APPLI C ATION S

Batteries with 350mAH to 2AH

Ratings

Cell Phones

PDAs

Charging Cradles

Digital Cameras

Low Cost Single Li-Ion Cell

Chargers

PRODUCT H I GHLIGHT

LX2201

LX2201

AC/DC Adapter

To System

Regulator

USB POWER

USB Lo / Hi

VIN

VDD

BAT

BAT

BAT

CMP

VDD

VDD

BAT

VDD

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 Complaint / Pb-free

0 to 70

LX2201CLQ

Note: Available in Tape & Reel.

Append the letters “TR” to the part number.

(i.e. LX2201CLQ-TR)