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LTC1649 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC1649
Description  3.3V Input High Power Step-Down Switching Regulator Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1649 Datasheet(HTML) 5 Page - Linear Technology

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5
LTC1649
BLOCK DIAGRA
–
+
–
+
ILIM
FB
MIN
PWM
MAX
+
40mV
+
1.26V
12
µA
40mV
12
µA
PVCC1
CPOUT
C+
SHDN
COMP
SS
IMAX
VCC
PVCC2
G1
G2
IFB
FB
1649 BD
INTERNAL
SHUTDOWN
50
µs
DELAY
VIN
CHARGE
PUMP
C–
TEST CIRCUIT
Figure 1
VCC
VOUT
2.5V
IMAX
SHDN
1
µF
G2
FB
VIN
VIN
3.3V
C+
LTC1649
PVCC2
PVCC1
G1
IFB
COMP
SS
C–
GND
CPOUT
1
µF
10
µF
MBR0530
0.1
µF
CC
0.01
µF
RC
7.5k
LEXT
1.2
µH
C1
220pF
10
µF
MBR0530
RIMAX
50k
22
Ω
1k
Q3
IRF7801
Q1, Q2
IRF7801
TWO IN
PARALLEL
COUT
4400
µF
CIN
3300
µF
SHDN
R2
12.7k
R1
12.4k
1649 TA03
+
0.33
µF
+
+
+


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