Low-Cost, Multichemistry Battery-
Charger Building Block
RS1
0.04Ω
V
TO EXTERNAL
LOAD
IN
D1
8VDC TO 28VDC
C1
22μF
C2
22μF
R14
R15
4.7Ω
4.7Ω
MAX172
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 ]
