LTC4268-1
12
42681fc
block DiagraM
19
SENSE

20
SENSE
+
C
CMP
V
CC
3V
TO FB
PGATE
SGATE
CURRENT
SENSE AMP
R
CMPF
50k
LOAD
COMPENSATION

+

+
+

+
V
CC
15.3V
V
CC
UVLO
10
UVLO
I
UVLO
18
OSC
15
t
ON
11
PGDLY
23
ENDLY
12
SYNC
13
1.237V
REFERENCE
(V
FB
)
INTERNAL
REGULATOR
UVLO
3V
COLLAPSE DETECT
ERROR AMP
CLAMPS
0.7
1.3
20V
+

S
R
Q
Q
1V
16
FB
17
V
CMP
14
SFST
TSD
CURRENT TRIP
SLOPE COMPENSATION
CURRENT
COMPARATOR
OVERCURRENT
FAULT
LOGIC
BLOCK

+
21
R
CMP
GATE DRIVE
22
PG
24
SG
9
GND
33
OSCILLATOR
SET
ENABLE
V
CC
GATE DRIVE
BOLD LINE INDICATES
HIGH CURRENT PATH
14V

+
32
NC
2
R
CLASS
3
I
LIM_EN
4
SHDN
PWRGD
V
PORTP
31
NC
1
30
PWRGD
29
V
NEG
28
V
NEG
V
NEG
26
CONTROL
CIRCUITS
INPUT
CURRENT
LIMIT
CLASSIFICATION
CURRENT LOAD
1.237V
1400mA
300mA
750mA

+
16k
25k
7
V
PORTN
V
PORTN
6
27
42681 BD
V
PORTN
5
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