6
LTC1624
FU
N
CTIO
N
AL DIAGRA
U
U
W
(Shown in a step-down application)
–
+
–
+
–
+
–
+
+
+
–
+
–
+
I
2
I
1
8
4k
8k
4k
V
IN
3
µ
A
RUN
C
B
V
OUT
C
OUT
C
IN
V
IN
BOOST
FLOATING
DRIVER
TG
SW
D1
L1
N-CHANNEL
MOSFET
N-CHANNEL
MOSFET
INTV
CC
R
SENSE
SENSE
–
D
B
5.6V
INTV
CC
REG
V
IN
0.8V
1.19V
200kHz
200kHz
1.19V
I
TH
/RUN
1.28V
1.19V
180k
1.5V
3
µ
A
30k
8k
2
3
4
5
6
7
GND
1624 FD
2.5
µ
A
SLOPE
COMP
SLOPE
COMP
ST
–
+
B
R
S
Q
OV
OSC
DROP-
OUT
DET
1-SHOT
400ns
SWITCH
LOGIC
INTV
CC
V
FB
V
FB
R2
R1
R
C
C
C
C
OSC
EA
1
g
m
= 1m
Ω
1.19V
REF
