LT1271CQ Linear Technology, LT1271CQ Datasheet - Page 2

• 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
A
Supply Voltage ....................................................... 30V
Switch Output Voltage ............................................ 60V
Feedback Pin Voltage (Transient, 1ms) ................ 15V
Storage Temperature Range ................ – 65 C to 150 C
PACKAGE/ORDER I FOR ATIO
*With device soldered to 1/2 square inch of 1oz copper over backside or internal layer
SYMBOL
V
I
gm
A
I
ELECTRICAL C
2
B
Q
ground plane. Consult factory for Industrial and Military grade parts.
REF
V
BSOLUTE
T
T
J MAX
J MAX
= 100 C,
= 100 C,
5-LEAD PLASTIC TO-220
PARAMETER
Reference Voltage
Feedback Input Current
Error Amplifier
Transconductance
Error Amplifier Source or
Sink Current
Error Amplifier Clamp
Voltage
Reference Voltage Line
Regulation
Error Amplifier Voltage Gain
Minimum Input Voltage (Note 3)
Supply Current
5-LEAD PLASTIC DD
FRONT VIEW
T PACKAGE
FRONT VIEW
Q PACKAGE
JC
JC
W
= 4 C/W,
= 4 C/W,
5
4
3
2
1
A
HARA TERISTICS
5
4
3
2
1
XI
JA
JA
W
= 30 C/W*
= 50 C/W
U
V
V
GND
FB
V
C
U
IN
SW
C
W
V
V
GND
FB
V
IN
SW
C
R
A
W
TI
ORDER PART
ORDER PART
CONDITIONS
Measured at Feedback Pin
V
V
V
Hi Clamp, V
Lo Clamp, V
3V V
0.9V V
3V V
C
FB
C
I
LT1271CQ
LT1269CQ
C
LT1271CT
LT1269CT
U
NUMBER
NUMBER
= 0.8V
= 1.5V
= V
= 25 A
G
IN
IN
REF
C
S
V
V
V
FB
IN
FB
1.4V
U
MAX,
MAX
= 1V
= 15V, V
= 1.5V
, V
V
C
C
= 0.8V
= 0.6V
SWITCH
POWER
Operating Junction Temperature Range
Lead Temperature (Soldering, 10 sec.)................ 300 C
C
= 0.5V, V
Operating .............................................. 0 C to 100 C
Short Circuit ......................................... 0 C to 125 C
WITH 0.75 SQ. IN. OF 1 OZ. COPPER TO 46 C/W
WITH 0.33 SQ. IN. OF 1 OZ. COPPER
AGND
WILL VARY FROM APPROXIMATELY 40 C/W
GND
GND
GND
GND
V
V
SW
SW
NC
V
FB
C
10
20-LEAD PLASTIC WIDE SO
1
2
3
4
5
6
7
8
9
FB
= V
SW PACKAGE
TOP VIEW
REF,
1.224
1.214
3000
2400
0.25
MIN
150
120
500
1.8
switch pin open, unless otherwise noted.
20
19
18
17
16
15
14
13
12
11
1.244
1.244
4400
V
V
NC
GND
GND
GND
GND
V
NC
NC
0.38
TYP
350
200
800
2.8
SW
SW
IN
7
POWER
SWITCH
1.264
1.274
MAX
1100
6000
7000
0.03
0.52
750
350
400
2.3
3.0
10
ORDER PART
LT1269CS
NUMBER
UNITS
mho
mho
%/V
V/V
mA
nA
nA
V
V
A
A
V
V
V