LTC1778 Linear Technology, LTC1778 Datasheet - Page 8

• Manufacturer Part Number: LTC1778
• Description: Wide Operating Range/ No RSENSE Step-Down Controller
• Manufacturer: Linear Technology

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