LT1271CQ Linear Technology, LT1271CQ Datasheet - Page 4
![IC SWTCHNG REG 4A HI-EFF 5-DD](/photos/7/55/75544/161-5-dd_sml.jpg)
LT1271CQ
Manufacturer Part Number
LT1271CQ
Description
IC SWTCHNG REG 4A HI-EFF 5-DD
Manufacturer
Linear Technology
Type
Step-Down (Buck), Inverting, Flybackr
Datasheet
1.LT1271CQ.pdf
(8 pages)
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)
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT1271CQ
Manufacturer:
Linear Technology
Quantity:
135
Part Number:
LT1271CQ
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1271CQ#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LT1271CQ#TR
Manufacturer:
SILICON
Quantity:
471
Part Number:
LT1271CQ#TR
Manufacturer:
LT/凌特
Quantity:
20 000
Part Number:
LT1271CQ#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
LT1271/LT1269
TYPICAL PERFOR
TYPICAL
4
12
6
0
9
3
A
Switch Current Limit vs Duty Cycle
0
PPLICATI
10 20 30
–55 C
125 C
DUTY CYCLE (%)
40
OPTIONAL
INTPUT
FILTER
W
L3
50 60 70 80 90 100
O
A
–12V
U
V
25 C
U
IN
CE
S
200 F
C4*
1271/69 G01
Negative-to-Positive Buck-Boost Converter
C
+
HARA TERISTICS
GND
C
LT1271
V
IN
V
C
100 H
R3
2.2k
V
L1**
SW
C1
0.22 F
FB
R2
1.24k
** COILTRONICS CTX100-2-52
MBR340
* REQUIRED IF INPUT LEADS 2"
200 F
D1
C2
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
+
0
Switch Saturation Voltage
T
2N3906
J
= 25 C
OPTIONAL
OUTPUT
Q1
FILTER
1
L2
SWITCH CURRENT (A)
R1
11.3k
V
12V, 1.5A
2
OUT
1271/69 TA04
C3
3
4
1271/69 G02
5