LT4254
8
4254fb
BLOCK DIAGRA
W
+
–
–
+
–
+
123µA
V
P
V
P
3.5mV
LOGIC
2V
12mV ~ 50mV
9.8V
4V
4V
V
CC
GND
0.65V
4.65V
–
+
–
+
4V4V
PWRGD
TIMER
4254 BD
V
CC
SENSE
V
P
GEN
FB
OV
3µA
UV
RETRY
GATE
OPEN
+
–
+
–
+
–
CHARGE
PUMP
AND
GATE
DRIVER
+
–
REF GEN
16
10
7
1
2
15
4
13
5
9
8
CURRENT
LIMIT
INTERNAL
UV
TIMER
LOW
TIMER
HIGH
FOLDBACK
OV
UV
OPEN-
CIRCUIT
DETECT
