9
LTC3729
sn3729 3729fas
FU CTIO AL DIAGRA
U
U
W
SWITCH
LOGIC
0.80V
4.7V
5V
V
IN
V
IN
CLK2
CLK1
+
–
–
+
V
REF
PHASE LOGIC
INTERNAL
SUPPLY
PHASMD
±
2
µ
A
EXTV
CC
INTV
CC
SGND
+
5V
LDO
REG
SW
SHDN
TOP
BOOST
TG
C
B
C
IN
D
B
PGND
BOT
BG
INTV
CC
INTV
CC
V
IN
+
V
OUT
3729
FBD
R1
EAIN
DROP
OUT
DET
RUN
SOFT
START
BOT
FCB
FORCE BOT
S
R
Q
Q
OSCILLATOR
PLLLPF
50k
EA
0.86V
0.80V
OV
1.2
µ
A
6V
R2
–
+
R
C
4(V
FB
)
RST
SHDN
RUN/SS
I
TH
C
C
C
SS
4(V
FB
)
0.86V
SLOPE
COMP
+
–
SENSE
–
SENSE
+
INTV
CC
30k
45k
2.4V
45k
30k
I1
PHASE DET
PLLIN
CLKOUT
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
+
–
R
SENSE
L
C
OUT
+
F
IN
R
LP
C
LP
0.74V
0.86V
A1
+
–
DIFFOUT
V
OS
+
V
OS
–
40k
40k
40k
40k
+
–
+
–
EAIN
PGOOD
