LP2950 Datasheet, PDF (6/14 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
LP2950/LP2951
Short Circuit Current
170
160
150
140
130
120
110
100
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (° C)
Dropout Voltage
600
500
400
300
~~
100
I_L= 100mA
50
I_L= 100µA
0
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (° C)
Dropout Voltage
500
400
300
200
T_J = 25°C
100
0
100µA 1mA
10mA
OUTPUT CURRENT
100mA
LP2951 Minimum Operating Voltage
2.2
2.1
2.0
1.9
1.8
1.7
1.6
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (° C)
LP2951 Feedback Bias Current
20
10
0
-10
-20
-30
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (° C)
LP2951 Feedback Pin Current
50 _{PIN 7 DRVEN BY EXTERNAL}
SOURCE (REGULATOR RUN
0
OPEN LOOP)
-50
-100
T_A = 125°C
-150
-200
-250
-2.0
T_A = 25°C
T_A = -55°C
-1.5 -1.0 -0.5 0 0.5 1.0
FEEDBACK VOLTAGE (V)
LP2951 Error Comparator Output
9
8
V_OUT= 5V
7
6
50k RESISTOR TO
EXTERNAL 5V SUPPLY
5
4
HYSTERESIS
3
50k
2
RESISTOR
1
TO V_OUT
0
0 123456 7 8
INPUT VOLTAGE (V)
LP2951 Comparator Sink Current
2.5
T_A = 125°C
2.0
1.5
T_A = 25°C
1.0
T_A = -55°C
0.5
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
OUTPUT LOW VOLTAGE (V)
Line Transient Response
100
mV
50
mV
0
-50
mV
~~
8V
C_L= 1µF
I_L= 1mA
V_OUT= 5V
6V
4V
0
200 400 600 800
TIME (µs)
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