Datasheet

LT1976/LT1976B
5
1976bfg
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LT1976 Efficiency and Power Loss
vs Load Current
Oscillator Frequency SHDN Threshold
SHDN Pin Current
Shutdown Supply Current
LT1976 Sleep Mode Supply
Current
LT1976 Bias Sleep Current
VOLTAGE (V)
1.35
1976 G03
1.20
1.10
1.05
1.00
1.40
1.30
1.25
0.15
TEMPERATURE (°C)
–50 0 50 75–25 25 100 150125
SHDN VOLTAGE (V)
0
0
CURRENT (μA)
1.5
2.5
3.5
10
20
30 40
1976 G04
50
4.5
5.5
1.0
2.0
3.0
4.0
5.0
60
T
J
= 25°C
CURRENT (μA)
1976 G05
20
10
5
0
25
15
TEMPERATURE (°C)
–50 0
50
75
–25
25
100
150125
V
IN
= 60V
V
IN
= 42V V
IN
= 12V
CURRENT (μA)
1976 G06
160
80
40
0
200
220
240
120
140
60
20
180
100
V
BIAS
= 0V
V
BIAS
= 5V
TEMPERATURE (°C)
–50 0
50
75
–25
25
100
150125
CURRENT (μA)
1976 G07
160
80
40
0
200
120
140
60
20
180
100
TEMPERATURE (°C)
–50 0
50
75
–25
25
100
150125
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
POWER LOSS (W)
50
75
5V
3.3V
1000
1976 TA02
25
0
1
10
100
10000
100
0.1
1
0.01
0.001
10
EFFICIENCY
TYPICAL
POWER LOSS
LT1976B Efficiency and Power
Loss vs Load Current
1.20
VOLTAGE (V)
1.21
1.23
1.24
1.25
1.30
1.27
1.22
1.28
1.29
1.26
TEMPERATURE (°C)
–50 0
50
75
1976 G01
–25
25
100
150125
FB Voltage
TEMPERATURE (°C)
–50
150
FREQUENCY (kHz)
160
180
190
200
250
220
0
50
75
1976 G02
170
230
240
210
–25
25
100
150125
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
POWER LOSS (W)
50
75
1000
1976 G25
25
0
1
10
100
10000
100
0.1
1
0.01
0.001
10
5V
3.3V
TYPICAL
POWER LOSS
EFFICIENCY