Datasheet

LTC3868
10
3868fd
FUNCTIONAL DIAGRAM
SW
25, 16
TOP
BOOST
24, 17
TG
26, 15
C
B
C
IN
D
D
B
CLKOUT
PGND
BOT
BG
23, 18
INTV
CC
INTV
CC
V
IN
C
OUT
V
OUT
3868 FD
R
SENSE
DROP
OUT
DET
BOT
TOP ON
S
R
Q
Q
SHDN
SLEEP
0.425V
ICMP
2.7V
0.55V
IR
3mV
SLOPE COMP
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
SENSE
+
32, 10
SENSE
1, 9
PGOOD1
V
FB1
0.88V
0.72V
L
27
21
+
+
+
+
PGOOD2
FREQ
V
FB2
0.88V
0.72V
+
+
+
+
14
+
+
SWITCH
LOGIC
V
FB
31, 11
R
A
C
C
R
C
C
C2
R
B
0.80V
TRACK/SS
0.88V
0.5µA
11V
RUN
7, 8
I
TH
30, 12
SS
29, 13
+
C
SS
1µA
10µA
SHDN
CURRENT
LIMIT
FOLDBACK
SHDN
RST
2(V
FB
)
SHORT CKT
LATCH-OFF
4
PHASMD
3
2
PLLIN/MODE
20µA
VCO
LDO
EN
INTV
CC
5.1V
SYNC
DET
100k
C
LP
CLK2
CLK1
5
I
LIM
28
V
IN
EXTV
CC
20
22
LDO
PFD
EN
4.7V
5.1V
+
19
SGND
6
EA
OV