LT1790 Просмотр технического описания (PDF) - Linear Technology
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LT1790 Datasheet PDF : 24 Pages
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1.25V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
LT1790
Line Regulation
1.285
1.280
1.275
TA = 125°C
1.270
1.265
1.260
1.255
1.250
1.245
TA = 25°C
TA = –55°C
1.240
1.235
1.230
1.225
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
17901.25. G07
Power Supply Rejection Ratio
vs Frequency
10
VIN = 3V
0 CL = 1µF
–10
–20
–30
–40
–50
–60
–70
–80
–90
100
1k
10k
100k
1M
FREQUENCY (Hz)
17901.25 G08
Output Impedance vs Frequency
500
VIN = 3V
100
CL = 0.47µF
10
CL = 4.7µF
CL = 1µF
1
0
100
1k
10k
FREQUENCY (Hz)
100k
17901.25 G09
– 1.25V Characteristics
0.30
0.25
0.20
0.15
R1 10k
4
3V
LT1790-1.25
6
12
VOUT
RL
5k
1µF
–VEE
0.10
TA = 25°C
TA = 125°C
0.05
TA = –55°C
0
–2.5 –2.0 –1.5 –1.0 –0.5
0
OUTPUT TO GROUND VOLTAGE (V)
17091.25 G10
Long-Term Drift
(Data Points Reduced After 500 Hr)
140
LT1790S6-1.25V
120 2 TYPICAL PARTS SOLDERED TO PCB
100 TA = 30°C
80
60
40
20
0
–20
–40
–60
0
200 400 600 800 1000
HOURS
17901.25 G10
Output Noise 0.1Hz to 10Hz
0 1 2 3 4 5 6 7 8 9 10
TIME (SEC)
17901.2 G12
Output Voltage Noise Spectrum
5.0
CL = 1µF
4.5
4.0
3.5
3.0
2.5
2.0
IO = 100µA
IO = 0µA
1.5
IO = 250µA
1.0
0.5
0
10
IO = 1mA
100
1k
10k
FREQUENCY (Hz)
17901.25 G13
Integrated Noise 10Hz to 1kHz
100
10
1
10
100
1000
FREQUENCY (Hz)
LT1790 G01
1790fa
11
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