LT1270C 데이터 시트보기 (PDF) - Linear Technology
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LT1270C Datasheet PDF : 4 Pages
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LT1270A/LT1270
U
TYPICAL APPLICATIO S
Negative-to-Positive Buck-Boost Converter
OPTIONAL
INPUT
FILTER
L3
VIN
–12V
C4
200µF*
L1
55µH**
VIN
VSW
LT1270
L2
OPTIONAL
C3
OUTPUT
FILTER
D1
VOUT
12V, 3A
C2
R1
2000µF 11.3k
GND
FB
VC
R3
2.2k
C1
0.22µF
1.24k
LT1270 • TA06
*REQUIRED IF INPUT LEADS ≥ 2"
**PULSE ENGINEERING #PE-92116
Negative Buck Converter
OPTIONAL
INPUT FILTER
L3
10µH
VIN
–20V
VIN
VSW
+ C3
100µF*
LT1270
FB
GND
VC
C1
R3
D1
L1
100µH**
R2
1.24k
LT1270 • TA07
C2
1000µF
R1
4.64k
LOAD
–5.2V, 7.5A
12k
OPTIONAL
OUTPUT
FILTER
L2
4µF
C4
200µF
*REQUIRED IF INPUT LEADS ≥ 2"
**PULSE ENGINEERING #PE-92115
U
PACKAGE DESCRIPTIO
T Package
5-Lead Plastic TO-220 (Standard)
(Reference LTC DWG # 05-08-1421)
.390 – .415
(9.906 – 10.541)
.147 – .155
(3.734 – 3.937)
DIA
.165 – .180
(4.191 – 4.572)
.460 – .500
(11.684 – 12.700)
.230 – .270
(5.842 – 6.858)
.570 – .620
(14.478 – 15.748)
.330 – .370
(8.382 – 9.398)
.620
(15.75)
TYP
.700 – .728
(17.78 – 18.491)
.045 – .055
(1.143 – 1.397)
BSC .067
(1.70)
.028 – .038
(0.711 – 0.965)
SEATING PLANE
.152 – .202
.260 – .320 (3.861 – 5.131)
(6.60 – 8.13)
.135 – .165
(3.429 – 4.191)
.095 – .115
(2.413 – 2.921)
.155 – .195*
(3.937 – 4.953)
.013 – .023
(0.330 – 0.584)
* MEASURED AT THE SEATING PLANE
T5 (TO-220) 0801
RELATED PARTS
PART NUMBER
LT1074/HV
LTC3414
LT3430/LT3431
DESCRIPTION
4.4A (IOUT), 100kHz, High Efficiency Step-Down
DC/DC Converter
4A (IOUT), 4MHz, Synchronous Step-Down
DC/DC Converter
60V, 2.75A (IOUT), 200/500kHz, High Efficiency
Step-Down DC/DC Converter
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com
COMMENTS
VIN: 7.3V to 45/64V, VOUT (min) = 2.21V, IQ = 8.5mA, ISD = 10µA,
DD-5/7, TO220-5/7
VIN: 2.3V to 5.5V, VOUT (min) = 0.8V, IQ = 64µA, ISD <1µA,
TSSOP20E
VIN: 5.5V to 60V, VOUT (min) = 1.2V, IQ = 2.5mA, ISD = 30µA,
TSSOP16E
1270afc
LT/TP 1203 1K REV C • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1992
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