
10
LTC1729 Series
TYPICAL APPLICATIO
N
S
4A, 2-Cell Lithium-Ion Battery Charger
CLN
CLP
INFET
UV
SYNC
SHDN
FLAG
CAP
COMP1
GBIAS
TGATE
SW
BGATE
V
C
PROG
3 CELL
V
FB
4.2V
4.1V
AGND
PGND
TO
SYSTEM
POWER
BAT2 BAT SENSE SPIN
R
4.93k
1%
C
PROG
1
μ
BOOST BOOSTC
OVP
BAT
SENSE
GND
V
CC
V
C
STATUS
NTC
LTC1729-8.4
LT1505
C
IN
*
47
μ
F
35V
OPTION: TIE RESISTOR TO STATUS FOR
CHARGE TERMINATION AT
LOW CHARGING CURRENT
* SANYO OS-CON
** SUMIDA CDRH127-150
*** AVX TPSD226L025R0200
LUMEX SML-LX0805GW-TR
R
S1
0.025
R
S2
200
1%
R
S4
0.025
M3
Si4435
DBODY
V
IN
(FROM
ADAPTER)
R7
500
R5
3k
R1
1k
R4
3k
C5
0.33
μ
F
R6
5.1k
R
S3
200
1%
C1
1
μ
F
8.4V
+
D5
V
CC
C
OUT
***
22
μ
F
×
2
C9
0.1
μ
F
C8
0.1
μ
F
C7
0.68
μ
F
C3
2.2
μ
F
C4
0.1
μ
F
M1
Si4412
M2
Si4412
D2
MMSD4148
D3
MMSD4148
L1**
15
μ
H
D4
MBRS140
5
C2
0.68
μ
F
R3
300
C6
0.1
μ
F
R8
100
R9
1.4k
R
PULL-UP
10k
1729 F09
10k NTC THERMISTOR, NTHS1206N02 VISHAY/DALE
NOTE: EITHER A THERMISTOR OR 10k RESISTOR MUST BE PRESENT