Datasheet

LTC3773
12
3773fb
Figure 1. Functional Diagram
BOOST
TG
SW
V
DR
BG
PGND
SENSE
+
SENSE
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
PHASE DET
OSCILLATOR
+
–
0.54V
0.6225V
0.66V
CLK3
CLK2
CH3 PBAD
CH2 PBAD
CH1 PBAD
100s
DELAY
PGOOD
CLKOUT PHASEMD
V
FB
I
TH
1V
0.5V
3V
+
–
+
–
SWITCH
LOGIC
FORCE CONT
FORCE BOT
DROP
OUT
DET
S
R
Q
Q
TOP ON
RS
LATCH
SHDN
SLEEP
+– +–
3mV
I
1
I
2
TOP
BOT
BOT
+
V
DR
R
LP
V
IN
F
IN
C
IN
D
B
C
B
C
LP
PLLFLTR
PLLIN/FC
R
SENSE
L
V
CC
V
CC
C
C
V
CC
R
C
V
DR
V
CC
OV
EA
0.6V
TRACK
5.3 x V
FB
0.645V
1.8V
DUPLICATE FOR CH2 AND CH3
SLOPE
COMP
SLOPE
COMP
+
–
+
+
54k 54k
2.4V
V
OUT
+
+
–
2.4V 1.8V 1.2V
SDB3 SDB2 SDB1
R2
R1
SHDN
DRV
SDB3SDB2
CH3
SHDN
CH2
SHDN
CH1
SHDN
MASTER
SHDN
UV
RESET
INTERNAL
SUPPLY
3.94V
C
VCC
C
OUT
V
REF
0.6V
SGND
V
CC
V
CC
+
3773 F01
V
CC
36k
36k
CLK1
ENABLE
BURST
FUNCTIONAL DIAGRAM