Datasheet

LTC3827
10
3827ff
FUNCTIONAL DIAGRAM
SHDN
SWITCH
LOGIC
+
–
4.7V
V
IN
V
IN
INTV
CC
-0.5V
0.8V
FC
BURSTEN
CLK2
CLK1
+
–
+
–
–
+
–
+
INTERNAL
SUPPLY
R
LP
C
LP
PLLIN/MODE
EXTV
CC
INTV
CC
SGND
+
5.25V/
7.5V
LDO
SW
25, 16
SHDN
SLEEP
0.4V
TOP
BOOST
24, 17
TG
26, 15
C
B
C
IN
D
D
B
PGND
BOT
BG
23, 18
INTV
CC
INTV
CC
V
IN
C
OUT
V
OUT
3827 FD
R
SENSE
R
B
V
FB
31, 11
DROP
OUT
DET
FOLDBACK
BOT
TOP ON
S
R
Q
Q
OSCILLATOR
PHASE DET
PLLLPF
PLLIN/MODE
FC
BURSTEN
EA
0.88V
0.80V
TRACK/SS
OV
V
FB
0.5µA
1µA
6V
R
A
–
+
R
C
2(V
FB
)
RST
SHDN
TRACK/SS
29, 13
I
TH
30,12
C
C
C
C2
C
SS
2(V
FB
)
0.45V
SLOPE
COMP
6mV
+
–
–
+
SENSE
–
1, 9
SENSE
+
32, 10
ICMP IR
B
RUN
7, 8
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
+– –+
PHASMD
CLKOUT
F
IN
+
–
+
–
+
–
+
–
PGOOD1
PGOOD2
V
FB1
V
FB2
0.88V
0.72V
0.88V
0.72V
L
FOLDDIS
5
3
2
4
27
28
22
21
20
19
14
6, 33
100k