Datasheet

LTC3809
7
3809fc
FUNCTIONAL DIAGRAM
–
+
–
+
–
+
–
+
–
+
SLOPE
SENSE
+
IPRG
CLK
ICMP
R
S
Q
ANTI-SHOOT-
THROUGH
GND
PV
IN
TG
BG
OV
UV
I
REV
0.68V
0.54V
V
FB
FCB
V
REF
0.6V
SS
FCB
SLEEP
BURSTDIS
0.15V
V
IN
0.3V
I
TH
3809 FD
V
FB
R
C
C
C
SW
L
MP
MN
C
OUT
V
OUT
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
R
A
R
B
–
+
+
SW
GND
–
+
EAMP
RICMP
CLK
BURSTDIS
SYNC/MODE
PLLLPF
I
REV
V
CO
PHASE
DETECTOR
CLOCK DETECT
BURST DEFEAT
t = 1ms
INTERNAL
SOFT-START
RUN
V
IN
V
IN
C
IN
2.6μA
0.4V
V
IN
UVSD
V
REF
0.6V
V
IN
0.7μA
UNDERVOLTAGE
LOCKOUT
VOLTAGE
REFERENCE
9
6
5
GND
SS
11
2
1
8
10
7
4
3