6
LTC1731-8.2/LTC1731-8.4
sn1731 17318fs
BLOCK DIAGRA
W
–
+
–
+
–
+
–
+
LOGIC
C1
–
+
C4
–
+
–
+
C3 A1
CA
C2
VA
CHARGE
GND
1731 BD
PROG
BATTERY CURRENT I
BAT
= (2.457V • 800Ω)/(R
PROG
• R
SENSE
)
R
PROG
V
REF
2.457V
4.9V
LBO
80Ω
V
CC
800Ω
54mV
R
SENSE
SENSE
DRV
BAT
720Ω
100µA
TIMER
OSCILLATOR
V
REF
COUNTER
STOP
SHDN SLP
C/10 C/10
2.5µA
V
CC
CHRG
4
5
2
3
8
7
6
1
+
–
