LX2202

Microsemi

Integrated Products Division

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

Page 6

Copyright

© 2004

Rev. 1.0a, 2006-02-09

2A Li-Ion Linear Charger and Power Control

TM

®

APPLICATION SCHEMATICS

AC/DC Adapter

USB POWER

USB Lo / Hi

To System

Power Bus

105k

2.55k

72.3k

2.49k

Charge

Indicator

VDD

USB

VDD

BAT

NU

BAT

CMP

VDD

VDD

BAT

B220

1N4148

1N5817

IRLMS6802

10µF

0.1µF

10µF

LX2202

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

Figure 3 – AC Adapter and USB Supply (Charge and Discharge Modes)

(1N4148 and IRLMS6802 are optional to lower USB voltage drop.)