LTC3708 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3708' PDF : 32 Pages View PDF
FUNCTIONAL DIAGRAM
LTC3708
FCB
EXTLPF
REPLL
CEPLL
INTLPF
CLOCK DETECTOR
FROM CHANNEL 2
TG
ENABLE
PHASE DETECTOR
(PD2)
PHASE DETECTOR
(PD1)
TO CHANNEL 2 OST
OST
tON
=
0.7
IION
(10pF)
R
Q
S
20k
+
ICMP
IREV
–
1.4V
VRNG
0.7V
s
3.3μA
RIPLL
CIPLL
ION RON
VCC
0.6V
+
CIN
VIN
REF
CVCC
FCNT
ON
SWITCH
LOGIC
SHDN
OV
BOOST
TG
SW
SENSE+
DRVCC
BG
PGND
SENSE–
CB
M1
L1
DB +
COUT
VOUT
CDRVCC
M2
0.66V
OV
VFB
R2
1
240k
ITH
CC
RC
TRACK
Q1 Q2
VREF
0.6V
DUPLICATE FOR SECOND
CHANNEL CONTROLLER
EA
Q4
R1
SGND
UV
0.54V
1.3V
Q3
RUN
SHDN
ENABLE
>100μs
BLANKING
FROM CHANNEL 2
OV AND UV COMPARATORS
1.2μA 6V
–+
1.3V
RUN/SS
CSS
NOTE: THE RUN/SS PIN ONLY CLAMPS
VREF FOR PHASE 1 NOT PHASE 2.
3708 FD
PGOOD
3708fb
9
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