Datasheet

LT3742
7
3742fa
block DiagraM
Σ
+
–
+
+
–
+
–
+
–
500kHz SLAVE
OSCILLATOR
R
S
Q
PHASE SYNC
LT3742 CONTROLLER 1 AND 2
CURRENT
SENSE
AMPLIFIER
GATE
DRIVER
ERROR
AMPLIFIER
SS
1µA
TO ENABLE
COMPARATOR
SENSE
+
SW
G
V
IN
V
OUT
BIAS
SENSE
–
RUN/SS
3
UVLO
V
IN
2
V
IN
25
GND
PG
FB
V
C
0.80V
FB
3742 BD1
0.88V
0.72V
PWM
COMPARATOR
POWER GOOD
COMPARATORS
4
BIAS
BIAS
1.25V
0.88V
0.80V
0.72V
SWB
V
IN
5
SHDN
PGOOD
+
–
GATE DRIVE BIAS
BOOST REGULATOR
V
REF
INTERNAL
SUPPLY
1MHz MASTER
OSCILLATOR
THERMAL
SHUTDOWN
ENABLE
ENABLE
COMPARATOR
≈0.5V
TO
RUN/SS1
RUN/SS2
UNDERVOLTAGE
LOCKOUT
3µA
UVLO
1.25V
+
–
+
+
–
ENABLE
PHASE SYNC FOR
DC/DC CONTROLLERS
Q
D
Q