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Complete Backup-Management ICs
for Lithium and NiMH Batteries
MAIN BATTERY
2.8V TO 5.5V
BACKUP BATTERY
L1
10µH
I/O OUT
3.3V, 50mA
R1
OPEN
I/O IN
Q1
R2
0Ω
R3
100kΩ
MEM OUT
2.5V, 10mA
MEM IN Q2
R4
100kΩ
C1
4.7µF
C2
10µF
C3
10µF
C4
4.7µF
1
IN
2
BK
16
REF
MAX8568A
4
LX
15
TERMV
5
BKSU
14
STRTV
C5
0.22µF
R6
50kΩ
R7
0Ω
3
PGND
10
BKV
7
OD1
6
LDO
13
GND
R8
1.2MΩ
11
INOK
9
NI/LI
NI
LI
MAIN
BATTERY
R9
357kΩ
R10
1MΩ
8
OD2
12
CHGI
R5
169kΩ
Figure 7. Typical Application Circuit
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