LT1271CQ Linear Technology, LT1271CQ Datasheet - Page 8

• Manufacturer Part Number: LT1271CQ
• Description: IC SWTCHNG REG 4A HI-EFF 5-DD
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Inverting, Flybackr

Specifications of LT1271CQ

• Synchronous Rectifier: No
• Number Of Outputs: 1
• Current - Output: 4A
• Frequency - Switching: 60kHz
• Voltage - Input: 3.5 ~ 30 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: D²Pak, TO-263 (5 leads + tab)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Power - Output: -
• Internal Switch(s): -

LT1271/LT1269
RELATED PARTS
PART NUMBER
LT1171
LT1370
LT1371
LT1372
LT1374
LT1376
8
TYPICAL
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
APPLICATION
DESCRIPTION
100kHz, 2.5A Boost Switching Regulator
500kHz, 6A Boost Switching Regulator
500kHz, 3A Boost Switching Regulator
500kHz, 1.5A Boost Switching Regulator
500kHz, 4.5A Buck Switching Regulator
500kHz, 1.5A Buck Switching Regulator
OPTIONAL
INTPUT
–8V TO –30V
FILTER
10 H
L3
V
IN
100 F
C3*
U
+
GND
Negative Buck Converter
LT1271
V
IN
V
MBR735
C
R3
V
C1
SW
FB
D1
R2
1.24k
COMMENTS
Good for V
6A, 42V Internal Switch
3A, 42V Internal Switch, 90% Efficiency
Also Regulates Negative Flyback Outputs
V
V
100 H
100 F
IN
IN
L1**
Up to 25V, SO-8 Package
Up to 25V, Uses 4.7 H Inductor
** COILTRONICS CTX100-2-52
C2
* REQUIRED IF INPUT LEADS 2"
+
2N3906
IN
Q1
Up to 40V
OPTIONAL
R1
4.64k
OUTPUT
FILTER
4 H
L2
+
127169fb LT/TP 0798 2K REV B • PRINTED IN USA
LOAD
12k
C4
200 F
LINEAR TECHNOLOGY CORPORATION 1992
–5.2V AT 3.5A
1271/69 TA05