LT1777 Linear Technology, LT1777 Datasheet - Page 7

• Manufacturer Part Number: LT1777
• Description: Low Noise Step-Down Switching Regulator
• Manufacturer: Linear Technology

BLOCK DIAGRA
OUTPUT STAGE SI PLIFIED SCHE ATIC
12
14
13
4
3
7
V
FB
V
SHDN
SYNC
SGND
C
CC
V
OSC
BG
W
BIAS
Q6
I
1
W
I
g
Q2
m
V
FEEDBACK
BG
SWITCH ON
SIGNAL
LOGIC
AMP
V
B
R1
C1
SWDR
SWON
Q3
R2
Q5
Q4
W
I
R1
I
2
Q1
R3
R4
I
COMP
V
V
SW
D
V
IN
L
SENSE
1777 SS
I
I
1
NOTE: R3 = R4
Q2
L
MAIN
LIMITER
LIMITER
– dV/dt
dI/dt
+
1777 BD
V
OUT
Q1
R
SENSE
V
V
SW
V
IN
D
10
6
5
LT1777
7