5
LTC3490
3490fa
FU CTIO AL DIAGRA
U
U
W
–
+
2
3
6
SW
CAP
GATE
CONTROL
AND
DRIVERS
BATTERY
MONITOR
PWM
LOGIC
LIMIT
V
IN
8
CTRL/
SHDN
START-UP
OSCILLATOR
I
REF
SENSE
AMP
OVERVOLTAGE
DETECT
DIMMING
AMP
19.2Ω
0.1Ω
250k
40k
V
REF
/2
–
+
–
+
–
+
P BODY
CONTROL
5
LED
LOBAT
3490 FD
1
CELLS
GND
SHUTDOWN
7
4
