9
LT3781
3781f
BLOCK DIAGRA
W
–
+
–
+
–
+
–
+
–
+
–
+
ERROR AMP
5V
REF
R
SQ
R
S
225mV
Q
10µA
S
Q
T
PHASE
DETECT
NOL
LOGIC
f = ×2
×12
20
19
18
15
12
V
BST
TG
BSTREF
BG
SG
14
PWRGND
BLANKING
–
+
1.25V
1.25V
1.25V
1.25V
REFERENCE
GENERATOR
×4
UVLO
(<8V)
I
LIM
13
V
CC
6
FSET
7
SYNC
10
V
C
11
SENSE
9
V
FB
1
SHDN
3
THERM
5
5V
REF
2
OVLO
4
SGND
8
SS
1681 BD
18V
