Datasheet

LTC3521
9
3521fb
For more information www.linear.com/LTC3521
block DiagraM
+
–
+
–
PGOOD1
PV
OUT
4
16
FB1
SHDN1
FILTER
REVERSE I
LIMIT
FORWARD
I
LIMIT
21
0.546V
2.1A
0.375A
+
–
+
–
0A
I
ZERO
BUCK-BOOST
PWM
LOGIC
GATE
DRIVES
GATE
DRIVES
BUCK
PWM
LOGIC
BANDGAP
REFERENCE
AND OT
SHUTDOWN
OSCILLATOR
UVLO
0.6V
SOFT-START
RAMP
+
+
–
SOFT-START
RAMP
10
SHDN2
1
SHDN3
9
8
D
V
OUT1
14
SW1B
15
SW1A
11
PV
IN1
22
PV
IN2
CB
A
PGND1BPGND1A
PGND2
ZERO CROSSING
5
V
IN
7
PWM
INTERNAL
V
CC
20
SW2
FB2
+
–
0A
+
–
+
–
1.05A
I
LIMIT
0.546V
3521 BD
0.60V
g
m
PGND1A
6
GND
12
PGND1B
18
PGND2
SLOPE
COMPENSATION
+
+
–
24
PGOOD2
+
+
–
1.2V
0.6V
0.546V
0.25V
3
PV
IN2
GATE
DRIVES
BUCK
PWM
LOGIC
SOFT-START
RAMP
PGND2
ZERO CROSSING
17
SW3
FB3
+
–
0A
+
–
+
–
1.05A
I
LIMIT
0.546V
0.60V
g
m
SLOPE
COMPENSATION
+
+
–
23
PGOOD3
+
+
–
2
PV
IN2
(UF Package)