Datasheet

8
LTC3778
3778f
FU CTIO AL DIAGRA
U
U
W
1.4V
0.7V
V
RNG
4
+
–
+
–
+
–
+
–
+
–
+
82
I
ON
6
FCB EXTV
CC
11
V
IN
1µA
R
ON
V
VON
I
ION
t
ON
= (10pF)
R
SQ
20k
I
CMP
I
REV
×
Q6
1V
3.3µA
SHDN
SWITCH
LOGIC
BG
ON
FCNT
F
0.6V
–
+
4.7V
OV
1
240k
Q1
Q2
Q3
0.8V
0.6V
0.4V
I
TH
R
C
C
C1
EA
SS
0.6V
Q4
+
–
+
–
×5.3
Q5
5
RUN/SS
C
SS
1
1778 FD
SGND
R2
R1
7
9
RUN
SHDN/
LATCH-OFF
14
PGND
15
PGOOD
V
FB
3
DRV
CC
13
INTV
CC
12
SW
18
TG
C
B
V
IN
C
IN
19
BOOST
20
–
+
–
+
UV
0.54V
OV
0.66V
C
VCC
V
OUT
M2
M1
L1
C
OUT
+
0.6V
REF
5V
REG
1.2µA
6V
D
B
I
THB
V
OUT
0.7V
2.4V
V
ON
R
SENSE
(OPTIONAL)*
SENSE
+
SENSE
–
16
17
10
SENSE
+
SENSE
–
BG
M2
*CONNECTION W/O
SENSE RESISTOR
SW
PGND
(0.5~2)