LT1270 Linear Technology, LT1270 Datasheet - Page 4

• Manufacturer Part Number: LT1270
• Description: 8A and 10A High Efficiency Switching Regulators
• Manufacturer: Linear Technology

PACKAGE DESCRIPTIO
TYPICAL APPLICATIO S
LT1270A/LT1270
4
PULSE ENGINEERING #PE-92116
Boost Converter (5V to 12V)
GND
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
[phone]
LT1270
V
5V
IN
–20V
V
IN
V
INPUT FILTER
C
55 H*
V
+
OPTIONAL
1k
SW
FB
(9.652 – 10.668)
(14.224 – 16.510)
10 H
1 F
0.380 – 0.420
(1.448 – 1.956)
L3
0.560 – 0.650
0.057 – 0.077
FAX
: [phone]
10.7k
1.24k
MBR1020
+
+
(3.531 – 3.886)
LT1270 • TA05
1000 F
25V
0.139 – 0.153
12V, 2A
C3
100 F*
DIA
TELEX
U
: 499-3977
GND
U
LT1270
(0.711 – 0.889)
V
(21.996 – 23.190)
0.028 – 0.035
IN
Dimensions in inches (millimeters) unless otherwise noted.
0.866 – 0.913
(2.007 – 3.429)
V
0.079 – 0.135
C
V
R3
SW
Negative Buck Converter
FB
(24.64 – 26.67)
C1
0.970 – 1.050
LT1270 • TA07
–12V
V
IN
100 H**
OPTIONAL
D1
R2
1.24k
FILTER
INPUT
L1
L3
(0.381 – 0.635)
0.015 – 0.025
(5.334 – 6.096)
(8.306 – 8.509)
0.327 – 0.335
0.210 – 0.240
+
Negative-to-Positive Buck-Boost Converter
C2
1000 F
(4.293 – 4.699)
0.169 – 0.185
(11.68 – 12.70)
OPTIONAL
0.460 – 0.500
+
OUTPUT
FILTER
C4
200 F*
R1
4.64k
4 F
L2
LOAD
12k
GND
+
–5.2V, 7.5A
C4
200 F
LT1270
V
IN
(15.75 ± 0.508)
0.620 ± 0.020
(4.318 – 4.699)
(1.397 – 2.286)
0.170 – 0.185
(0.889 – 1.397)
0.055 – 0.090
V
0.035 – 0.055
(2.007 – 2.921)
0.079 – 0.115
55 H**
**PULSE ENGINEERING #PE-92115
C
V
*REQUIRED IF INPUT LEADS 2"
R3
2.2k
L1
SW
FB
C1
0.22 F
LT1270 • TA06
(17.780 – 18.491)
0.700 – 0.728
LINEAR TECHNOLOGY CORPORATION 1992
1.24k
T5 (FORMED) 0392
**PULSE ENGINEERING #PE-92116
D1
*REQUIRED IF INPUT LEADS 2"
OPTIONAL
OUTPUT
+
FILTER
C2
2000 F
L2
LT/GP 1292 5K REV B
C3
R1
11.3k
V
12V, 3A
OUT