LTC3709 Linear Technology, LTC3709 Datasheet - Page 9

• Manufacturer Part Number: LTC3709
• Description: No RSENSE Synchronous DC/DC Controller
• Manufacturer: Linear Technology

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FU CTIO AL DIAGRA
EXTLPF
FCB
U
C
C
R
SECOND CHANNEL
DUPLICATE FOR
C
TRACK
V
I
CLOCK DETECTOR
RNG
TH
U
t
ON
1.4V
0.7V
=
OST
I
0.7
ION
240k
Q1 Q2
I
CMP
(30pF)
1
+
–
×
PLL2
V
FROM CHANNEL 2
3.3µA
20k
0.6V
REF
R
S
Q
Q3
SHED
W
+
–
TG
EA
TO CHANNEL 2 OST
I
REV
–
+
I
THB
PLL1
Q4
SWITCH LOGIC
CHANNEL 2
INTLPF
SHDN TO
1.4V
–
+
+
–
SHDN
RUN
RUN/SS
1.4V
SHDN
FCNT
ON
OV
I
ON
SWITCH
0.6V
REF
LOGIC
R
C
ON
SS
OV
UV
1.2µA 6V
+
–
+
–
+
V
CC
C
0.66V
0.54V
VCC
BOOST
DRV
SENSE
PGND
SENSE
SW
TG
BG
CC
+
–
V
V
OS
OS
5V
+
–
40k
40k
40k
+
C
C
BLANKING
B
DRVCC
100µs
C
IN
+
–
D
B
M1
M2
DISABLE
40k
SGND
LTC3709
V
V
L1
FB
IN
DIFFOUT
PGOOD
+
R2
R1
C
V
OUT
OUT
9
3709f
3709 FD