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LT1070 Datasheet(PDF) 9 Page - Linear Technology

Part # LT1070
Description  5A and 2.5A High Efficiency Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1070 Datasheet(HTML) 9 Page - Linear Technology

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9
LT1070/LT1071
TYPICAL APPLICATIONS (Note that maximum output currents are divided by 2 for the LT1071)
Positive Current Boosted Buck Converter
R3
680
C1
0.33
µF
200pF
*REQUIRED IF INPUT LEADS
≥ 2"
R4
1.24k
C2
5000
µF
VOUT
5V
10A
VIN
28V
R1
5k
VSW
VIN
C3
0.47
µF
C6
0.002
µF
D2
470
2W
1:N
N
≈ 0.25
LT1070
GND
VC
FB
1070/71 TA19
R6
470
COMP
LM308
VIN
R2
1k
R7
1.24k
R5
5k
V
7
D1
2
3
8
4
6
V +
+
C5*
100
µF
+
Positive to Negative Buck/Boost Converter
+
R1
11.3k
1070/71 TA05
VOUT
12V
2A
VIN
– 12V
R3
2.2k
C1
0.22
µF
R2
1.24k
*
**
REQUIRED IF INPUT LEADS
≥ 2"
PULSE ENGINEERING 92113
C2
1000
µF
+
C4*
100
µF
L1**
150
µH
Q1
D1
VSW
VC
VIN
LT1070
GND
FB
C3
L2
OPTIONAL
OUTPUT
FILTER
L3
OPTIONAL
INPUT
FILTER
+
R6
470
1070/71 TA09
VIN
10V TO 30V
*
**
REQUIRED IF INPUT LEADS
≥ 2"
PULSE ENGINEERING 92113
TO AVOID START-UP
PROBLEMS FOR INPUT
VOLTAGES BELOW 10V,
CONNECT ANODE OF D3
TO VIN AND REMOVE R5.
C1 MAY BE REDUCED FOR
LOWER OUTPUT CURRENTS.
C1
≈ (500µF)(IOUT) FOR 5V
OUTPUTS, REDUCE R3 TO
1.5k, INCREASE C2 TO 0.3
µF
AND REDUCE R6 TO 100
Ω.
VOUT
– 12V
2A
R3
5k
R2
1.24k
C1
0.1
µF
C5*
100
µF
C3
2
µF
+
C4
5
µF
+
C1
1000
µF
L1**
200
µH
VSW
VC
VIN
LT1070
R5
470
1W
D3
1N4001
R1
10.7k
R4
47
D2
1N914
D1
GND
FB
Negative to Positive Buck/Boost Converter


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