Datasheet

8
LTC3718
3718fa
FU CTIO AL DIAGRA S
U
U
W
1.4V
0.7V
V
RNG
4
V
REF
9
V
ON
2
+
–
+
–
+
–
+
–
+
7
I
ON
2.4V0.7V
16
V
IN1
R
ON
V
VON
I
ION
t
ON
= (10pF)
R
SQ
20k
I
CMP
I
REV
×
5.7µA
SHDN
SWITCH
LOGIC
BG
ON
OV
1
240k
Q1
Q2
0.6V
0.6V
I
TH
R
C
R1
40k
C
C1
EA
SS
+
–
Q5
5
R2
80k
RUN/SS
C
SS
1
3718 FD01
SGND1
6
8
RUN
SHDN
18
PGND1
19
SENSE
–
20
PGOOD
V
FB1
3
INTV
CC
17
SW1
22
SENSE
+
21
TG
C
B
V
IN
C
IN
23
BOOST
24
–
+
–
+
UV
3/10V
REF
11/30V
REF
OV
C
VCC
V
OUT
M2
M1
L1
C
OUT
+
0.8V
REF
5V
REG
1.2µA
6V
D
B
I
THB
R4
40k
R3
20k
–
+
–
+
FF
RQ
S
0.15Ω
SW2
DRIVER
COMPARATOR
14
SHUTDOWN
SHDN
10
13
–
+
Σ
RAMP
GENERATOR
R
C2
C
C2
1.4MHz
OSCILLATOR
PGND2
3718 FD02
R6
40k
R10
140k
R9
30k
Q2
x10
Q1
Q3
R8
(EXTERNAL)
R7
(EXTERNAL)
R5
40k
V
OUT2
V
IN2
15
V
FB2
FB2 12
SGND2
11
A2
A1
g
m