LX2201

Microsemi

Integrated Products Division

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

Page 5

Copyright

© 2000

Rev. 1.2b, 2005-04-13

USB Li-Ion Battery Charger

TM

®

APPLI CATI ON CI RCUITS

START

YES

DISCHARG E

MO D E

NO

C O N D ITIO N

CHARG E

MO D E

NO

YE S

CO NSTA NT C URRENT

CH AR G E M O D E

TEM P <

140

REDUCE

CHARG E

CU RRENT

YE S

REDUCE

CH AR G E

C URRENT

YE S

NO

NO

CO NSTA NT VO LTAG E

CH AR G E M O D E

YE S

NO

VO LTAG E

M O NITO RIN G

MO D E (ST AT E ).

YE S

NO

TEM P <

140

REDUCE

CHARG E

C URRENT

YE S

REDUCE

CH AR G E

C URRENT

YE S

NO

NO

YE S

NO

R E TU R N TO STAR T IF

VIN > VB AT O R VIDX C H A N G E STATE.

R E TU R N TO TH E T O P

O F TH E C H AR T.

LX 2201 C O N TR O L F LO W D IA G R A M

VID 0 = 1

YES

SW IT CH

OFF

NO

S TATE O F VID 1.

VID 0 = 1

YE S

NO

VID0 = 1

YES

NO

Figure 2 – Control Flow Diagram