Datasheet

21
LTC1479
TYPICAL APPLICATIONS N
U
Dual NiMH Battery Power Management System (Using an LT1510, 1A Charger)
1479 TA02
DCIN
BAT1
BAT2
+
+
V
+
SW V
GG
C3
1µF
50V
L1*
1mH
C4
1µF
50V
V
CC
R
SENSE
0.033Ω
SW A SW B
SW C SW D
SW E SW F
GA GB GC GD GE GFSAB SCD SEF SENSE
+
SENSE
–
V
CCP
C2
2.2µF
16V
C1
0.1µF
V
BAT
POWER
MANAGEMENT
µP
BDIV
V
BKUP
DCDIV
LTC1479
GG SG
GH SH
NiCD
CELL
1812LS-105 XKBC, COILCRAFT
CD43, SUMIDA
CTX33-2, COILTRONICS
*
**
***


R
B2

909k
1%
R
DC2

205k
1%
330Ω
R
DC1

12.1k
1%
R
B1

121k
1%
+
LOBAT
DCINGOOD
TO INPUT 
OF DC/DC 
CONVERTER
L2**
10µH
3DM
5V
CC

FROM 
DC/DC
V
CC
D1 
MBR0530
BATSEL
GND BATDIS DCIN/BAT
CHGSEL
DC INPUT
(FROM AC
ADAPTOR)
V
CC
D2
MBRS140T
R5
300Ω
C8
1µF
PROG
R
PROG

11k
1%
R6
1k
C9
0.1µF
V
C
SW
BOOST
SENSE
BAT
GND
C7
0.22µF
D3
1N4148
L3***
33µH
D4
MBRS140T
LT1510
SW H
Si9926DY
C6
10µF
CERAMIC
C
CHG

22µF
TANT
(CHARGER OUTPUT)
Si4936DY
Si4936DY
(BOLD LINES INDICATE HIGH CURRENT PATHS)
Si4936DY
SW G
Si9926DY
Q1
2N7002
R2
390k
1%
R3
100k
1%
+
+
C
BAT1

10µF
C
BAT2

10µF
SMBUS
BAT2
12-CELL
NiMH
BATTERY
PACK
BAT1
12-CELL
NiMH
BATTERY
PACK
R4
100k
1%
CHGMON
R
TH1
R
TH1
R
TH1
R
TH2
+
+
C5
0.1µF
C11
0.1µF
R1
22k
100k
R7
470k
4
8
7
3
5
C10
0.1µF
1
6
2
5V
CC
FROM
DC/DC
D5
BAS16LT1
Q2
2N7002
ROHM
DTA144E
R
CM2
909k
1%
R
CM1

100k
1%
R8
10k
(BACKUP)
3
6
7
8
5
4
2
1
SW
FB
SHDN
V
IN
GNDI
LIM
LBI
LBO
LT1304
+
C
DCIN

10µF
35V
ALUM
0.1µF