Datasheet

23
LTC1479
Dual Li-Ion Battery Power Management System (Using an LT1511, 3A Charger)
TYPICAL APPLICATIONS N
U
1479 TA04
DCIN
BAT1
BAT2
+
+
V
+
SW V
GG
C3
1µF
50V
L1*
1mH
C4
1µF
50V
V
CC
R
SENSE
0.033Ω
SW A
330Ω
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
DT1608-223, COILCRAFT
CTX20-4, COILTRONICS
*
**
***

R
B2

1.05M
1%
R
DC2

205k
1%
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)
SW H
Si9926DY
Si4936DY
Si4936DY
Si4936DY
SW G
Si9926DY
R2
390k
1%
R3
100k
1%
+
+
C
BAT1

10µF
C
BAT2

10µF
SMBUS
BAT2
4 Li-ION
SMART
BATTERY
PACK
BAT1
4 Li-ION
SMART
BATTERY
PACK
CHGMON
R
BAT1
R
BAT1
R
BAT2
R
BAT2
+
C5
0.1µF
C15
0.1µF
R1
22k
R11
470k
100k
4
8
7
3
5
C14
0.1µF
1
6
2
5V
CC
FROM
DC/DC
D5
BAS16LT1
Q2
2N7002
ROHM
DTA144E
R12
10k
(BACKUP)
SW
FB
SHDN
V
IN
GNDI
LIM
LBI
LBO
LT1304
V
CC
R5
500Ω
C9
0.33µF
C8
1µF
PROG
10
19
18
11
6
2
18
8
14 12
3
1, 4, 5, 7,
16, 23, 24
9
20 TO 22
R
PROG

4.93k
1%
C10
200pF
V
C
SW
UV
BOOSTCOMP1
SPIN
BAT SENSE
GND
C13
0.47µF
C11
50pF
C12
1µF
C7
10µF
D3
MBR0540T
L3***
20µH
D2
MBRS340T
LT1511
C6
10µF
CERAMIC
+
C
CHG

22µF
TANT
+
C
DCIN

10µF
35V
ALUM
+
(CHARGER OUTPUT)
Q1
2N7002
R6
1k
R7
649k
0.25%
R9
6.8k
R10
5k
R4
500Ω
R
S4

0.05Ω
R8
115k
0.25%
R
S3

200Ω
1%
R
S2

200Ω
1%
R
S1

0.033Ω
OVP
CLPCLN
D1
MBRS340T
(BOLD LINES INDICATE HIGH CURRENT PATHS)

0.1µF
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.