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