LTC1649 Linear Technology, LTC1649 Datasheet - Page 5

• Manufacturer Part Number: LTC1649
• Description: 3.3V Input High Power Step-Down Switching Regulator Controller
• Manufacturer: Linear Technology

BLOCK DIAGRA
TEST CIRCUIT
COMP
SHDN
I
MAX
V
SS
IN
SHDN
3.3V
10 F
V
IN
V
CC
+
12 A
12 A
22
C1
220pF
W
I
LIM
MBR0530
R
7.5k
C
C
0.01 F
DELAY
+
C
50 s
R
50k
0.1 F
IMAX
+
+
1.26V
FB
P
P
V
I
SHDN
COMP
SS
GND
MAX
VCC1
VCC2
CC
LTC1649
MBR0530
INTERNAL
SHUTDOWN
CP
PWM
OUT
V
I
G1
G2
FB
C
C
FB
IN
Figure 1
+
–
+
+
MIN
40mV
1 F
10 F
1 F
1k
C
+
0.33 F
CHARGE
PUMP
+
C
Q1, Q2
IRF7801
TWO IN
PARALLEL
Q3
IRF7801
–
MAX
40mV
+
C
3300 F
1.2 H
IN
L
EXT
12.4k
12.7k
R1
R2
+
1649 TA03
C
4400 F
LTC1649
OUT
V
2.5V
OUT
1649 BD
CP
PV
G1
PV
G2
I
FB
FB
OUT
CC1
CC2
5