LT1270 Linear Technology, LT1270 Datasheet - Page 2

• Manufacturer Part Number: LT1270
• Description: 8A and 10A High Efficiency Switching Regulators
• Manufacturer: Linear Technology

A
ELECTRICAL CHARACTERISTICS
LT1270A/LT1270
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
SYMBOL
V
I
gm
A
I
V
V
BV
V
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 1, 3)
Control Voltage to Switch
Current Transconductance
W
A
XI
W
U
W
R
A
CONDITIONS
0.9V V
Duty Cycle = 0
T
Measured at Feedback Pin
V
V
V
Hi Clamp, V
Lo Clamp, V
3V V
3V V
I
0.05 I
I
3V V
V
I
3V V
I
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
= 5mA
100 C
125 C
U
IN
IN
IN
IN
REF
FB
C
G
V
V
V
V
FB
FB
1.4V
1mA
MAX
MAX
MAX
MAX
S
= 1V
= 1.5V
V
, V
, V
IN
C
C
= 15V, V
= 0.8V
= 0.6V
PACKAGE/ORDER I FOR ATIO
C
= 0.5V, V
T
JMAX
= 100 C,
FB
5-LEAD TO-220
FRONT VIEW
= V
T PACKAGE
JA
REF
= 2 C/W,
5
4
3
2
1
1.224
1.214
3000
2400
1.80
0.25
0.80
0.60
0.40
15.0
14.0
MIN
150
120
500
150
4.5
15
25
60
, switch pin open, unless otherwise noted.
JA
= 50 C/ W
1.244
1.244
4400
0.38
0.90
0.45
16.3
0.01
0.12
TYP
350
200
800
300
2.8
6.8
32
40
75
12
7
V
V
GND
FB
V
U
IN
SW
C
1.264
1.274
1100
6000
7000
MAX
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
LT1270CT
LT1270ACT
W
NUMBER
UNITS
mho
mho
mho
U
%/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