4

LT1270A/LT1270

TYPICAL APPLICATIO S

Boost Converter (5V to 12V)

Negative-to-Positive Buck-Boost Converter

R3

FB

GND

LT1270

L1

100

µH**

C1

R2

1.24k

*REQUIRED IF INPUT LEADS

≥ 2"

**PULSE ENGINEERING #PE-92115

LT1270 • TA07

C3

100

µF*

–5.2V, 7.5A

–20V

OPTIONAL

INPUT FILTER

C2

1000

µF

D1

R1

4.64k

LOAD

12k

L3

10

µH

+

C4

200

µF

OPTIONAL

OUTPUT

FILTER

L2

4

µF

+

+

Negative Buck Converter

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

LT/GP 1292 5K REV B

© LINEAR TECHNOLOGY CORPORATION 1992

T5 (FORMED) 0392

0.028 – 0.035

(0.711 – 0.889)

0.057 – 0.077

(1.448 – 1.956)

0.139 – 0.153

(3.531 – 3.886)

DIA

0.079 – 0.135

(2.007 – 3.429)

0.380 – 0.420

(9.652 – 10.668)

0.970 – 1.050

(24.64 – 26.67)

0.560 – 0.650

(14.224 – 16.510)

0.866 – 0.913

(21.996 – 23.190)

0.327 – 0.335

(8.306 – 8.509)

0.700 – 0.728

(17.780 – 18.491)

0.035 – 0.055

(0.889 – 1.397)

0.169 – 0.185

(4.293 – 4.699)

0.170 – 0.185

(4.318 – 4.699)

0.620 ± 0.020

(15.75 ± 0.508)

0.460 – 0.500

(11.68 – 12.70)

0.210 – 0.240

(5.334 – 6.096)

0.055 – 0.090

(1.397 – 2.286)

0.015 – 0.025

(0.381 – 0.635)

0.079 – 0.115

(2.007 – 2.921)

1k

MBR1020

FB

GND

LT1270

10.7k

+

55

µH*

1

µF

1.24k

+

1000

µF

25V

5V

12V, 2A

PULSE ENGINEERING #PE-92116

LT1270 • TA05

R3

2.2k

FB

GND

LT1270

L1

55

µH**

C1

0.22

µF

1.24k

*REQUIRED IF INPUT LEADS

≥ 2"

**PULSE ENGINEERING #PE-92116

LT1270 • TA06

+

C2

2000

µF

D1

R1

11.3k

+

C4

200

µF*

12V, 3A

L2

C3

OPTIONAL

OUTPUT

FILTER

–12V

OPTIONAL

INPUT

FILTER

L3

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487