LT1082 Linear Technology, LT1082 Datasheet - Page 3

• Manufacturer Part Number: LT1082
• Description: 1A High Voltage/ Efficiency Switching Voltage Regulator
• Manufacturer: Linear Technology

I
f
BV
V
V
I
DC
SYMBOL
The
temperature range.
Note 1: Measured with V
ELECTRICAL C
Q
LIM
FB
SAT
I
I
SW
IN
MAX
denotes the specifications which apply over the operating
Supply Current
Control Pin Threshold
Normal/Flyback Threshold
on Feedback Pin
Switching Frequency
Output Switch Breakdown Voltage
Control Voltage to Switch
Current Transconductance
Flyback Reference Voltage
Change in Flyback Reference Voltage
Flyback Reference Voltage Line Regulation
Flyback Amplifier Transconductance (g
Flyback Amplifier Source
and Sink Current
Output Switch “On” Resistance (Note 1)
Switch Current Limit
(LT1082C)
Switch Current Limit
(LT1082I)
Switch Current Limit
(LT1082M)
Supply Current Increase
During Switch-On Time
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode Supply Current
Shutdown Mode
Threshold Voltage
PARAMETER
C
in hi clamp, V
HARA TERISTICS
FB
C
= 0.8V.
m
)
3V V
Duty Cycle = 0
CONDITIONS
800 A I
3V V
I
60 A I
I
V
I
I
Duty Cycle = 20%
Duty Cycle 50%
Duty Cycle = 80% (Note 2)
Duty Cycle = 20%
Duty Cycle 50%
Duty Cycle = 80% (Note 2)
Duty Cycle = 20%
Duty Cycle 50%
Duty Cycle = 80% (Note 2)
3V V
3V V
FB
FB
FB
SW
C
I
C
= 0.6V Source
= 60 A
= 60 A, 3V V
= 60 A Sink
= 10 A
= 0.7A (LT1082C), I
V
IN
IN
IN
IN
IN
FB
= 15V, V
FB
V
V
V
V
MAX
MAX
MAX
MAX
200 A
450 A
, V
, V
, I
SW
C
IN
Note 2: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current decreases linearly.
C
C
= 0.5V, V
= 0.6V
= 0.05V
= 1.5mA
V
SW
MAX
= 0.5A (LT1082M)
FB
= V
REF
, output pin open, unless otherwise specified.
0.58
MIN
0.7
0.5
50
45
100
150
3.5
1.07
1.0
0.8
0.85
0.8
0.65
0.75
0.7
0.6
17
16
15
30
85
70
50
0.67
18.6
0.01
115
300
120
150
4.5
TYP
0.9
1.5
4.6
0.8
1.5
60
12
32
50
35
92
7.0
MAX
1.1
1.25
0.8
20.5
21.5
0.03
70
75
500
350
250
300
6.5
1.2
2.6
2.6
2.4
2.8
2.8
2.6
3.0
3.0
2.8
70
90
45
97
LT1082
UNITS
mA/A
3
%/V
mho
A/V
kHz
kHz
kHz
mA
mV
mV
%
V
V
V
V
V
V
V
A
A
A
A
A
A
A
A
A
A
A
A
s