LT3581 LINER [Linear Technology], LT3581 Datasheet - Page 8

• Manufacturer Part Number: LT3581
• Description: 3.3A Boost/Inverting DC/DC Converter with Fault Protection
• Manufacturer: LINER [Linear Technology]

LT3581
block DiagraM
V

IN
C
SS
**SW OVERVOLTAGE PROTECTION IS NOT GUARANTEED TO PROTECT THE LT3581 DURING SW OVERVOLTAGE EVENTS
C
IN
SS
SHDN
V
FB
1.33V
IN
START
SOFT-
+
–
250k
REFERENCE
2.1V
1.215V
V
C
50mV
14.6k
14.6k
GATE
+
–
LDO
–
–
1.8V
+
+
A1
A2
UVLO
933µA
–
+
C
C
R
R
FAULT
FAULT
C
AND FAULT
STARTUP
LOGIC
L1
DIE TEMP
V
Figure 1. Block Diagram
C
FREQUENCY
FOLDBACK
DRIVER
DISABLE
165°C
D1
MIN
22V
÷N
SYNC
V
IN
ADJUSTABLE
OSCILLATOR
GENERATOR
BLOCK
SYNC
RAMP
C
OUT1
∑
COMPARATOR
750mV
–
+
R
A3
RT
T
A3
OPTIONAL
R
GATE
SS
**
**
+
–
+
–
+
–
M1
SAMPLE
CLKOUT
SW1
42V
MIN
SW2
42V
MIN
I
1.9A
MIN
SW1
R
C
SAMPLE MODE BLOCK
SR1
TD ~ 30ns
OUT2
S
+
–
Q
VBE • 0.9
V
DRIVER
OUT
A4
+
–
+
–
+
–
1.17V
45mV
FB
Q2
20m
27m
R
S
SW2
SW1
GND
Q1
3581 BD
3581f
R
FB