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BLOCK DIAGRAM
MODE/PLLIN
FREQ
MODE/SYNC
DETECT
PLL-SYNC
CLKOUT
OSC
IFAST
(CHANNEL 2
ONLY)
5k
+
I
CMP
–
ILIM
INTV
CC
1
50k
I
THB
SLEEP
V
IN
0.6V
REF
0.55V
TCOMP/ITEMP
ENTMPB
(Functional diagram shows one channel only)
EXTV
PHASMD
TCOMP/ITEMP
TEMPSNS
0.6V
–
+
F
FCNT
S
R Q
–
I
REV
+
RUN
SLOPE
COMPENSATION
UVLO
ACTIVE CLAMP
SS
RUN
EA
0.5V
1.22V
C
ITH
C1
R
C
30µA
MIRROR
+
AMP
–
TRSET
R
TCOMP
For more information
CC
4.7V
–
+
F
5.5V
REG
BURST EN
ON
SWITCH
LOGIC
AND
ANTISHOOT-
THROUGH
OV
+
0.555V
UV
–
+
OV
–
1.25µA
V
FB
C
RUN
TK/SS
SS
*n EQUALS THE NUMBER
OF CHANNELS IN PARALLEL
TAVG
+
R
g
TCOMP
m
n*
–
REPEAT FOR
MULTICHIP OPERATIONS
www.linear.com/LTC3875
LTC3875
V
IN
V
IN
+
C
IN
INTV
CC
BOOST
TG
C
B
M1
SW
+
SNSA
D
B
–
SNS
BG
M2
C
PGND
VCC
PGOOD
+
SNSD
+
AMP
–
–
SNS
20k
0.66V
+
20k
DIFFAMP
–
–
V
OSNS
20k
20k
1µA/5.5µA
3875 BD
V
OUT
R2
+
C
OUT
R1
SGND
+
+
V
OSNS
–
3875fb
11
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