Datasheet
LT3763
12
3763fa
For more information www.linear.com/LT3763
block DiagraM
–
+
8
IVINMON
15
SS
13
CTRL2
+
–
+
–
10
FBIN
GND (12, 23, 28, 29)
1.206V
–
+
+
14
CTRL1
–
+
–
1.5V
1.5V
90k
11µA
3763 BD
C
SS
10nF
5
V
REF
V
IN
C
REF
2.2µF
C
FILT
1µF
4
EN/UVLO
V
OUT
R
FB2
12.1k
R
FAULT
47.5k
R
FB1
47.5k
R
FILTA
1k
R
FILTB
1k
CURRENT
MIRROR
INPUT
CURRENT
MONITORING
g
m
= 400µA/V
2V REFERENCE
OSCILLATOR
INTERNAL
REGULATOR
AND UVLO
50k
R
S
2.5mΩ
VOLTAGE
REGULATOR AMP
g
m
= 850µA/V
CONTROL
BUFFER
C
IN1
4.7µF
C
IN2
47µF
C
VCC
22µF
C
BOOST
200nF
L1
1µH
7
IVINP
6
IVINN
3
V
IN
2
INTV
CC
BOOST
25
TG
26
SW
1
BG
21
SYNC
20
RT
24
PWM_OUT
22
PWM
27
SYNCHRONOUS
CONTROLLER
HIGH SIDE
DRIVER
LOW SIDE
DRIVER
R Q
S
+
–
R
T
82.5k
18
V
C
R
C
47.5k
C
C
4.7nF
–
+
1.5V
1.206V
1.16V
0.25V
+
–
19
ISMON
+
–
0.1V
+
–
17
SENSE
+
16
SENSE
–
11
FB
9
FAULT
OUTPUT
MONITORING
C/10
COMPARATOR
FAULT
DETECTION
COMPARATORS
+
–
+
–
C
OUT
200µF
×2
INTV
CC
3k
R
SENSE_IN
2.5mΩ
g
m
AMP
g
m
= 475µA/V
R
O
= 3.5M
V
CM(HIGH)
= V
IN
– 1.4V
Figure 1. Block Diagram