Low-Cost, Multichemistry Battery-
Charger Building Block
RS1
0.04Ω
TO EXTERNAL
LOAD
V
IN
8VDC TO 28VDC
D1
C1
22µF
C2
22µF
R14
4.7Ω
R15
4.7Ω
C6
O.47µF
C7
O.47µF
3.30V
1.5kΩ
D4
910Ω
3.30V
R6
59.0kΩ
CSSP
DCIN
CSSN
CELLS
R7
19.6kΩ
C5
1µF
R19
29.4kΩ
R21
10kΩ
LDO
C13
1µF
R13
33Ω
D3
REFIN
VCTL
R20
10kΩ
R22
10kΩ
BST
DLOV
C15
0.1µF
C16
1.0µF
ICTL
R8
1M
ACIN
ACOK
ICHG
N1
DHI
LX
N2
DLO
D2
MAX1772
L1
22µH
PGND
R11
1Ω
IINP
CCV
CSIP
C14
0.1µF
C20
0.1µF
R9
15.4kΩ
R10
12.4kΩ
C18
0.1µF
R5
RS2
0.05Ω
1kΩ
C11
0.1µF
R12
1Ω
C19
0.1µF
CSIN
BATT
GND
CCI
+
BATT
CCS
C9
0.01µF
C10
0.01µF
C3
22µF
C4
22µF
BATTERY
BATT-
REF
CLS
C12
1µF
Figure 1b. Stand-Alone Typical Application Circuit
______________________________________________________________________________________ 13
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
