ltc3728legn-trpbf Linear Technology Corporation, ltc3728legn-trpbf Datasheet - Page 10

• Manufacturer Part Number: ltc3728legn-trpbf
• Description: Dual, 550khz, 2-phase Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

FUNCTIONAL DIAGRAM
LTC3728
10
R6
R5
V
F
IN
+
IN
R
V
C
5V
SEC
LP
LP
PLLFLTR
PGOOD
3.3V
EXTV
INTV
PLLIN
SGND
FCB
V
IN
OUT
50k
CC
0.18μA
CC
1.5V
OSCILLATOR
4.7V
PHASE DET
+
–
4.5V
0.8V
+
–
+
–
–
+
CLK1
CLK2
INTERNAL
–
+
–
+
–
+
–
+
SUPPLY
V
LDO
REG
5V
REF
0.86V
0.74V
0.86V
0.74V
BINH
FCB
V
V
OSENSE1
OSENSE2
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
1.2μA
6V
4(V
0.86V
FB
SLOPE
COMP
)
I1
S
R
+
–
0.55V
Q
Q
–
DROP
Figure 2
OUT
DET
45k
+
–
+
4(V
SHDN
+
RST
FB
B
3mV
)
BOT
TOP ON
–
SHDN
FCB
START
45k
SOFT
RUN
–
+
OV
2.4V
EA
I2
SWITCH
–
+
+
–
LOGIC
V
FB
0.80V
0.86V
TOP
BOT
INTV
CC
INTV
30k
30k
CC
V
SENSE
SENSE
RUN/SS
BOOST
PGND
OSENSE
SW
BG
I
TG
TH
+
–
INTV
CC
R1
D
C
C
C
B
D
R2
C2
SS
B
C
SEC
C
V
IN
R
C
R
D
SENSE
1
+
+
C
C
IN
SEC
+
3728fd