LT1790BCS6 Datasheet, PDF (12/26 Pages) Linear Technology – Micropower SOT-23 Low Dropout Reference Family

LT1790
1.25V TYPICAL PERFORMANCE 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.
Line Regulation
1.285
1.280
1.275
T_A = 125°C
1.270
1.265
1.260
1.255
1.250
1.245
T_A = 25°C
T_A = –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
V_IN = 3V
0 C_L = 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
V_IN = 3V
100
C_L = 0.47μF
10
C_L = 4.7μF
C_L = 1μF
1
0
100
1k
10k
FREQUENCY (Hz)
100k
17901.25 G09
– 1.25V Characteristics
0.30
0.25
0.20
R1 10k
4
3V
LT1790-1.25
6
12
V_OUT
R_L
1μF
5k
0.15
–V_EE
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
Output Noise 0.1Hz to 10Hz
20
0.10
T_A = 25°C
0
0.05
T_A = 125°C
T_A = –55°C
–20
–40
0
–2.5
–2.0 –1.5 –1.0 –0.5
0
OUTPUT TO GROUND VOLTAGE (V)
17091.25 G10
–60
0
200 400 600 800 1000
HOURS
17901.25 G11
0 1 2 3 4 5 6 7 8 9 10
TIME (SEC)
17901.25 G12
12
Output Voltage Noise Spectrum
5.0
C_L = 1μF
4.5
4.0
3.5
3.0
2.5
2.0
I_O = 100μA
I_O = 0μA
1.5
I_O = 250μA
1.0
0.5
0
10
I_O = 1mA
100
1k
10k
FREQUENCY (Hz)
17901.25 G13
Integrated Noise 10Hz to 1kHz
100
10
1
10
100
1000
FREQUENCY (Hz)
17901.25 G14
1790fb