Datasheet

LT3800
7
3800fc
FUNCTIONAL DIAGRAM
–
+
–
+
–
+
–
+
–
+
V
IN
UVLO
(<4V)
BST
UVLO
8V
REG
FEEDBACK
REFERENCE
–
+
1.231V
3.8V
REG
INTERNAL
SUPPLY RAIL
1
16
15
14
12
10
9
17
3
5
7
4
6
V
IN
V
CC
UVLO
(<6V)
SHDN
DRIVE
CONTROL
DRIVE
CONTROL
NOL
SWITCH
LOGIC
DRIVE
CONTROL
BURST_EN
V
C
C
SS
SENSE
–
V
FB
–
+
1.185V
1V
0.5V
ERROR
AMP
2µA
Burst Mode
OPERATION
8
SOFT-START
DISABLE/BURST
ENABLE
R
SQ
OSCILLATOR
SLOPE COMP
GENERATOR
BOOST
TG
SW
V
CC
11
BG
PGND
SENSE
+
GND
3800 FD
BOOSTED
SWITCH
DRIVER
CURRENT
SENSE
COMPARATOR
g
m
–+
R
S
Q
–
+
160mV
SYNCHRONOUS
SWITCH DRIVER
REVERSE
CURRENT
INHIBIT
10mV
–
+