4
LT1270A/LT1270
1270afc
PART NUMBER DESCRIPTION COMMENTS
LT1074/HV 4.4A (I
OUT
), 100kHz, High Efficiency Step-Down V
IN
: 7.3V to 45/64V, V
OUT
(min) = 2.21V, I
Q
= 8.5mA, I
SD
= 10µA,
DC/DC Converter DD-5/7, TO220-5/7
LTC3414 4A (I
OUT
), 4MHz, Synchronous Step-Down V
IN
: 2.3V to 5.5V, V
OUT
(min) = 0.8V, I
Q
= 64µA, I
SD
<1µA,
DC/DC Converter TSSOP20E
LT3430/LT3431 60V, 2.75A (I
OUT
), 200/500kHz, High Efficiency V
IN
: 5.5V to 60V, V
OUT
(min) = 1.2V, I
Q
= 2.5mA, I
SD
= 30µA,
Step-Down DC/DC Converter TSSOP16E
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1992
LT/TP 1203 1K REV C • PRINTED IN USA
RELATED PARTS
PACKAGE DESCRIPTIO
U
T5 (TO-220) 0801
.028 – .038
(0.711 – 0.965)
.067
(1.70)
.135 – .165
(3.429 – 4.191)
.700 – .728
(17.78 – 18.491)
.045 – .055
(1.143 – 1.397)
.095 – .115
(2.413 – 2.921)
.013 – .023
(0.330 – 0.584)
.620
(15.75)
TYP
.155 – .195*
(3.937 – 4.953)
.152 – .202
(3.861 – 5.131)
.260 – .320
(6.60 – 8.13)
.165 – .180
(4.191 – 4.572)
.147 – .155
(3.734 – 3.937)
DIA
.390 – .415
(9.906 – 10.541)
.330 – .370
(8.382 – 9.398)
.460 – .500
(11.684 – 12.700)
.570 – .620
(14.478 – 15.748)
.230 – .270
(5.842 – 6.858)
BSC
SEATING PLANE
* MEASURED AT THE SEATING PLANE
T Package
5-Lead Plastic TO-220 (Standard)
(Reference LTC DWG # 05-08-1421)
TYPICAL APPLICATIO S
U
R3
V
IN
V
SW
FB
V
C
GND
LT1270
L1
100µH**
C1
R2
1.24k
*REQUIRED IF INPUT LEADS ≥ 2"
**PULSE ENGINEERING #PE-92115
LT1270 • TA07
C3
100µF*
–5.2V, 7.5A
V
IN
–20V
OPTIONAL
INPUT FILTER
C2
1000µF
D1
R1
4.64k
LOAD
12k
L3
10µH
+
C4
200µF
OPTIONAL
OUTPUT
FILTER
L2
4µF
+
+
Negative Buck ConverterNegative-to-Positive Buck-Boost Converter
R3
2.2k
V
IN
V
SW
FB
V
C
GND
LT1270
L1
55µH**
C1
0.22µF
1.24k
*REQUIRED IF INPUT LEADS ≥ 2"
**PULSE ENGINEERING #PE-92116
LT1270 • TA06
+
C2
2000µF
D1
R1
11.3k
+
C4
200µF*
V
OUT
12V, 3A
L2
C3OPTIONAL
OUTPUT
FILTER
V
IN
–12V
OPTIONAL
INPUT
FILTER
L3
