LTC3708 LINER [Linear Technology], LTC3708 Datasheet - Page 9

• Manufacturer Part Number: LTC3708
• Description: Fast 2-Phase, No RSENSE Buck Controller with Output Tracking
• Manufacturer: LINER [Linear Technology]

FUNCTIONAL DIAGRAM
EXTLPF
R
FCB
EPLL
C
C
C
EPLL
R
C
DUPLICATE FOR SECOND
CHANNEL CONTROLLER
TRACK
V
I
CLOCK DETECTOR
RNG
TH
t
ON
1.4V
0.7V
=
OST
I
0.7
ION
Q1
240k
I
CMP
(10pF)
1
PHASE DETECTOR
+
–
Q2
ENABLE
(PD2)
V
FROM CHANNEL 2
REF
3.3μA
20k
0.6V
R
S
Q
–
+
Q3
TG
NOTE: THE RUN/SS PIN ONLY CLAMPS
V
EA
REF
TO CHANNEL 2 OST
I
PHASE DETECTOR
REV
FOR PHASE 1 NOT PHASE 2.
–
+
(PD1)
Q4
INTLPF
1.3V
–
–
+
+
1.3V
SHDN
RUN
SHDN
FCNT
ON
OV
I
ON
RUN/SS
R
IPLL
C
IPLL
SWITCH
LOGIC
R
ON
C
OV
UV
1.2μA 6V
SS
+
+
–
–
0.6V
3708 FD
REF
0.66V
0.54V
BOOST
DRV
SENSE
PGND
SENSE
SW
TG
BG
FROM CHANNEL 2
OV AND UV COMPARATORS
CC
V
CC
+
–
C
VCC
+
C
C
BLANKING
B
DRVCC
ENABLE
>100μs
C
IN
D
B
LTC3708
M1
M2
+
SGND
V
V
L1
FB
IN
C
OUT
PGOOD
R2
R1
3708fb
9
V
OUT