Datasheet

8
LT1070/LT1071
10701fe
TYPICAL APPLICATIONS
U
(Note that maximum output currents are divided by 2 for the LT1071)
Negative Current Boosted Buck Converter
1070/71 TA13
R3
R2
1.24k
Q1
2N3906
R4
12k
C2
C3
R1
MINIMUM
LOAD = 10mA
–V
OUT
5V
10A
D1
T1
1:N
R5
•
•
C1
V
SW
V
C
V
IN
–V
IN
LT1070
GND
FB
+
+
V
OUT
– 0.6V
1mA
R1 =
1070/71 TA12
R3
R2
1.24k
*
**
REQUIRED IF INPUT LEADS ≥ 2"
PULSE ENGINEERING 92113
Q1
2N3906
R1
4.64k
C1
C2
1000µF
C3
100µF
V
IN
–20V
–5.2V
4.5A
D1
L1**
200µH
V
SW
V
C
V
IN
LT1070
GND
OPTIONAL INPUT
FILTER
FB
LOAD
C4
200µF
L2
4µH
OPTIONAL
OUTPUT
FILTER
+
+
+
L3
Negative Buck Converter
Positive Buck Converter
R2
1.24k
R4
10Ω
100mA
MINIMUM
1070/71 TA14
5V
4.5A
R3
470Ω
C1
1µF
D1
r
+
C3
2.2µF
+
C5*
100µF
+
C2
1µF
+
C4
1000µF
L1**
100µH
V
SW
V
C
V
IN
V
IN
LT1070
R1
3.74k
D2
1N914
GND
FB
D3
L2
4µH
C5
200µF
OPTIONAL
OUTPUT
FILTER
*
**
REQUIRED IF INPUT LEADS ≥2"
PULSE ENGINEERING 92112