LTC1778/LTC1778-1
FU CTIO AL DIAGRA
R
ON
2 V
ON
**
0.7V
2.4V
7 I
ON
1
t
ON
=
V
冯
(10pF)
I
离子
R
S
Q
FCNT
ON
+
I
CMP
20k
+
I
转
开关
逻辑
–
1.4V
–
SHDN
OV
V
RNG
3
保护地
×
0.7V
3.3A
1
240k
Q2 Q4
I
THB
Q6
Q3 Q1
Q5
OV
+
–
×4
0.8V
SS
EA
RUN
SHDN
0.6V
0.8V
*LTC1778
**LTC1778-1
5
I
TH
C
C1
R
C
8
+
–
W
V
IN
4 FCB
4.7V
1A
9 EXTV
CC
10 V
IN
–
+
U
U
+
C
IN
+
–
0.8V
REF
0.8V
5V
REG
–
F
+
BOOST
16
TG
15
SW
14
L1
D
B
INTV
CC
11
BG
12
C
VCC
M2
V
OUT
C
B
M1
+
C
OUT
13
PGOOD *
2
R2
1V
UV
+
–
0.76V
V
FB
8
+
–
1.2A
0.84V
R1
SGND
6
+
–
6V
1
RUN / SS
SS
1778 FD
0.6V
1778fa
