lt1976 Linear Technology Corporation, lt1976 Datasheet - Page 5

• Manufacturer Part Number: lt1976
• Description: High Voltage 1.5a, 200khz Step-down Switching Regulator With 100?a Quiescent Current
• Manufacturer: Linear Technology Corporation

TYPICAL PERFOR A CE CHARACTERISTICS
100
250
240
230
220
210
200
190
180
170
160
150
25
25
20
15
10
75
50
0
5
0
–50
0.1
–50
Oscillator Frequency
Shutdown Supply Current
LT1976 Efficiency and Power Loss
vs Load Current
–25
–25
5V
1
V
IN
0
3.3V
0
LOAD CURRENT (mA)
EFFICIENCY
= 42V
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
10
50
50
V
V
IN
100
TYPICAL
POWER LOSS
IN
75
75
= 12V
= 60V
100
100
1000
W
125
125
1976 TA02
1976 G02
1976 G05
10000
U
150
150
10
0.1
0.01
0.001
1
1.40
1.35
1.30
1.25
1.20
0.15
1.10
1.05
1.00
100
240
220
200
180
160
140
120
100
75
50
25
80
60
40
20
0
0
–50
–50
0.1
LT1976 Sleep Mode Supply
Current
LT1976B Efficiency and Power
Loss vs Load Current
SHDN Threshold
–25
–25
1
0
0
LOAD CURRENT (mA)
TEMPERATURE (°C)
TEMPERATURE (°C)
EFFICIENCY
5V
V
V
25
25
BIAS
BIAS
10
3.3V
50
50
= 0V
= 5V
100
75
75
TYPICAL
POWER LOSS
100
100
1000
125
125
1976 G25
1976 G06
1976 G03
10000
150
150
0.01
0.001
10
0.1
1
1.30
1.29
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
200
180
160
140
120
100
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
LT1976/LT1976B
80
60
40
20
0
0
–50
–50
0
SHDN Pin Current
LT1976 Bias Sleep Current
FB Voltage
T
J
–25
= 25°C
–25
10
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
SHDN VOLTAGE (V)
20
25
25
50
50
30
75
75
40
100
100
50
1976bfg
125
125
5
1976 G01
1976 G04
1976 G07
150
150
60