Datasheet

LTC3728L/LTC3728LX
11
3728lxff
FuncTional DiagraM
Figure 2
SWITCH
LOGIC
–
+
0.8V
4.7V
5V
V
IN
V
IN
4.3V
BINH
CLK2 CLK1
0.18µA
R6 R5
+
–
FCB
+
–
–
+
–
+
–
+
V
REF
INTERNAL
SUPPLY
3.3V
OUT
INTV
CC
R
LP
C
LP
3V
FCB
EXTV
CC
INTV
CC
SGND (UH PACKAGE PAD)
+
5V
LDO REG
SW
SHDN
0.55V
TOP
BOOST
TG
C
B
C
IN
D
1
D
B
PGND
BOT
BG
INTV
CC
INTV
CC
V
IN
+
C
OUT
V
OUT
3728 FD/F02
R
SENSE
R2
+
V
OSENSE
DROP
OUT
DET
RUN
SOFT
START
BOT
TOP ON
S R
Q Q
OSCILLATOR
PHASE DET
PLLFLTR
PLLIN
FCB
EA
0.86V 0.80V
OV
V
FB
1.2µA
6V
R1
–
+
R
C
4(V
FB
)
RST
SHDN
RUN/SS
I
TH
C
C
C
C2
C
SS
4(V
FB
)
0.86V
SLOPE
COMP
3mV
+
–
–
+
SENSE
–
SENSE
+
INTV
CC
30k
45k
2.4V
45k
30k
I1 I2
B
DUPLICATE FOR SECOND CONTROLLER CHANNEL
+– –+
50k
F
IN
+
–
+
–
+
–
+
–
PGOOD
V
OSENSE1
V
OSENSE2
0.86V 0.74V 0.86V 0.74V