Datasheet

LT3514
10
3514fa
For more information www.linear.com/LT3514
BLOCK DIAGRAM
3514 BD
V
IN
Σ
S
R NQ
S
R NQ
Σ
SYNC
DETECT
CLK1
CLK2
OSC
FREQUENCY
TO CURRENT
TO CH3, CH4
STARTUP/SHUTDOWN
THERMAL SHUTDOWN
0.4V
1µA
1.44V
ON
REF
PRECISION UVLO
V
IN
EN/UVLO
LOCK
1SHOT
SLOPE
SLOPE
1SHOT
SKY
5V
BOOST ERROR AMP
0.7V
BOOST SWITCH AND DRIVE
SW5
SW1
DA1
PG
FB1
SKY
V
IN
PGOOD
OUT1
COMPARATORS FROM OTHER CHANNELS
FB1
0.72V
CURRENT LIMIT FOLDBACK
0.8V
0.7V
SKYBAD
0.8V
BOOST REGULATOR
Q5
D5
Q1
SWITCH AND DRIVE
ONE OF THREE BUCK REGULATORS SHOWN
POWER GOOD LOGIC
RT/SYNC RUN/SS1 GND
2.2V
0.1V
1µA
SKYBAD
0
1
+
–
4.5V
SKYBAD
SKY
V
IN