Low-Cost Multichemistry Battery Chargers
Typical Application Circuits (continued)
AC ADAPTER
INPUT
8.5V TO 28V
RS1
0.01Ω
TO EXTERNAL
LOAD
P1
R11
15kΩ
C1
2 × 10µF
0.01µF 0.01µF
R12
12kΩ
REFIN (4 CELLS SELECT)
CSSP
ACOK
CSSN
D2
R6
59kΩ
1%
CELLS
R7
19.6kΩ
1%
DCIN
LDO
C5
1µF
LDO
R14
10.5kΩ
1%
VCTL
LDO
C13
R13
1µF
33Ω
D3
REFIN
BST
R15
8.25kΩ
1%
DLOV
C15
C16
0.1µF
1µF
ICTL
N1a
16.8V OUTPUT VOLTAGE
2.5A CHARGE LIMIT
R16
8.25kΩ
1%
DHI
LX
ACIN
R19
C12
10kΩ
1%
1.5nF
N1b
FROM HOST µP
(SHUTDOWN)
N
DLO
MAX1908
MAX8724
L1
10µH
SHDN
PGND
R20
10kΩ
1%
ICHG
IINP
CSIP
CCV
R5
1kΩ
RS2
0.015Ω
C11
0.1µF
CSIN
BATT
GND
CCI
+
BATT
CCS
C9
0.01µF
C10
0.01µF
C4
22µF
BATTERY
THM
BATT-
REF
CLS
C12
1µF
R17
19.1kΩ
1%
PGND GND
R18
22kΩ
1%
4A INPUT CURRENT LIMIT
Figure 2. Typical Application Circuit with Fixed Charging Parameters
14 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
