LT1082 Linear Technology, LT1082 Datasheet - Page 6

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

LT1082
TYPICAL PERFOR
6
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
–75 –50
Error Amplifier Transconductance
–25
TEMPERATURE (°C)
0
–100
–200
–300
–400
25
800
700
600
500
400
300
200
400
300
200
100
0
0
0
Feedback Pin Clamp Voltage
V
50
C
T
g
0.1
J
m
Pin Characteristics
= 25°C
75
=
(CURRENT OUT OF V
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
0.5
V
I
100
W
FEEDBACK CURRENT (mA)
(CURRENT INTO V
(V
(FB PIN)
V
C
125
V
PIN)
C
A
1082 G18
FB
PIN VOLTAGE (V)
V
1.0
T
T
T
FB
= 0.8V
U
J
J
150
J
= –55°C
= 150°C
= 25°C
= 1.5V
CE
1.5
C
C
400
350
300
250
200
150
100
PIN)
50
C
PIN)
0
–75 –50
HARA TERISTICS
Shutdown Thresholds
2.0
1082 G21
–25 0
1082 G23
VOLTAGE AT V
2.5
TEMPERATURE (°C)
C
25
50
C
CURRENT
(OUT OF V
75
PIN
100
–1000
7000
6000
5000
4000
3000
2000
1000
500
450
400
350
300
250
200
150
100
125
50
C
0
0
1k
PIN)
Switch “Off” Characteristics
0
Transconductance of Error
Amplifier
150 175
1082 G19
A. V
B. V
C. V
D. V
E. V
10
IN
IN
IN
IN
IN
–400
–350
–300
–250
–200
–150
–100
–50
0
20 30
= 75V
= 3V
= 15V
= 40V
= 55V
10k
A
SWITCH VOLTAGE (V)
FREQUENCY (Hz)
B
40
100k
50
g
10
m
9
8
7
6
5
4
3
2
1
–75 –50
60
C
Idle Supply Current vs
Temperature
V
70
C
1M
= 0.6V
D
–25 0
80
1082 G24
90 100
1082 G22
TEMPERATURE (°C)
E
10M
25
–30
0
30
60
90
120
150
180
210
V
V
IN
IN
50
= 75V
= 3V
75
100
125
150 175
1082 G20