LT1071 Linear Technology, LT1071 Datasheet - Page 9

• Manufacturer Part Number: LT1071
• Description: 5A and 2.5A High Efficiency Switching Regulators
• Manufacturer: Linear Technology

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