LT1270ACT Linear Technology, LT1270ACT Datasheet - Page 2

• Manufacturer Part Number: LT1270ACT
• Description: IC SW-REG 10A HI-EFF TO220-5
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost), Inverting, Flybackr

Specifications of LT1270ACT

• Synchronous Rectifier: No
• Number Of Outputs: 1
• Current - Output: 10A
• Frequency - Switching: 60kHz
• Voltage - Input: 3.5 ~ 30 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Bent and Staggered Leads)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Power - Output: -
• Internal Switch(s): -

A
LT1270A/LT1270
(Note 1)
Supply Voltage ....................................................... 30V
Switch Output Voltage ............................................ 60V
Feedback Pin Voltage (Transient, 1ms) ................ 15V
Operating Junction Temperature Range
Storage Temperature Range ................ – 65 c to 150 C
Lead Temperature (Soldering, 10 sec)................ 300 C
ELECTRICAL C
SYMBOL
V
I
gm
A
I
V
V
BV
V
LIM
ture range, otherwise specifications are at T
2
B
Q
REF
V
FB
FB
SAT
BSOLUTE
LT1270AC/LT1270C (Oper.) ................ 0 C to 125 C
LT1270AC/LT1270C (Short-Ckt) ......... 0 C to 140 C
PARAMETER
Reference Voltage
Feedback Input Current
Error Amplifier
Transconductance
Error Amplifier Source of
Sink Current
Error Amplifier Clamp Voltage
Reference Voltage Line Regulation
Error Amplifier Voltage Gain
Minimum Input Voltage
Supply Current
Control Pin Threshold
Normal/Flyback Threshold
on Feedback Pin
Flyback Reference Voltage
Change in Flyback Reference
Voltage
Flyback Reference Voltage
Line Regulation
Flyback Amplifier
Transconductance (gm)
Flyback Amplifier Source
and Sink Current
Output Switch Breakdown
Voltage
Output Switch ON
Resistance (Note 2, 4)
Control Voltage to Switch
Current Transconductance
Switch Current Limit (LT1270)
(Note 4)
W
A
HARA TERISTICS
XI
W
U
C
W
R
A
A
= 25 C. V
CONDITIONS
Measured at Feedback Pin
V
V
V
Hi Clamp, V
Lo Clamp, V
3V V
0.9V V
3V V
Duty Cycle = 0
I
0.05 I
I
3V V
V
I
3V V
I
T
T
Duty Cycle = 50%, T
Duty Cycle = 80%, T
FB
FB
FB
SW
J
J
C
FB
C
C
l
l
C
C
TI
= 0.8V
= 1.5V
= 0.6V Source
= 50 A
= 50 A
= 50 A Sink
= 25 A
= 10 A
= V
= 1.5mA
100 C
125 C
U
IN
IN
IN
IN
REF
FB
C
G
IN
V
V
V
V
FB
FB
1.4V
1mA
MAX
MAX
MAX
MAX
= 15V, V
S
The
= 1V
= 1.5V
, V
, V
C
C
J
J
= 0.8V
= 0.6V
denotes specifications which apply over the full operating tempera-
C
100 C
100 C
= 0.5V, V
Consult LTC Marketing for parts specified with wider operating temperature ranges.
PACKAGE/ORDER I FOR ATIO
GND
TAB
IS
T
JMAX
FB
= V
= 100 C,
REF
5-LEAD PLASTIC TO-220
, switch pin open, unless otherwise noted.
T PACKAGE
FRONT VIEW
JA
= 2 C/W,
1.224
1.214
3000
2400
1.80
0.25
0.70
0.50
0.40
15.0
14.0
MIN
150
120
500
150
4.5
15
25
60
8
6
5
4
3
2
1
JA
= 50 C/ W
1.244
1.244
4400
0.38
0.90
0.45
16.3
0.01
0.12
TYP
300
350
200
800
2.8
6.8
32
40
75
12
7
U
V
V
GND
FB
V
IN
SW
C
1.264
1.274
MAX
1100
6000
7000
2.30
0.52
0.03
1.08
1.25
0.54
17.6
18.0
0.03
0.18
0.22
ORDER PART
750
350
400
650
3.0
8.5
10
70
70
16
14
W
LT1270CT
LT1270ACT
NUMBER
UNITS
1270afc
U
mho
mho
mho
%/V
%/V
A/V
V/V
mA
nA
nA
V
V
A
A
V
V
V
V
V
V
V
V
V
A
A
V
A
A