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LP2951-4.8 View Datasheet(PDF) - Micrel

Part NameDescriptionManufacturer
LP2951-4.8 100mA Low-Dropout Voltage Regulator Micrel
Micrel Micrel
LP2951-4.8 Datasheet PDF : 14 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
LP2950/2951
Micrel
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 DRIVEN BY EXTERNAL
0
SOURCE (REGULATOR RUN
OPEN LOOP)
-50
TA = 125°C
-100
-150
-200
TA = 25°C
-250
TA = –55°C
-2.0 -1.5 -1.0 -0.5 0
0.5 1.0
FEEDBACK VOLTAGE (V)
LP2951
Error Comparator Output
8
VOUT = 5V
6
LP2951
Comparator Sink Current
2.5
TA = 125°C
2.0
100 Line Transient Response
mV
50
mV
4
HYSTERESIS
2
0
1.5
TA = 25°C
3
1.0
-50
mV
TA = -55°C
8V
CL= 1 µF
IL = 1 mA
VOUT = 5V
0
PULLUP RESISTOR TO
-2
SEPARATE 5V SUPPLY
0 12 34 5
0.5
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
6V
4V
0 200 400 600 800
INPUT VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
TIME (µs)
Load Transient Response
250
200
150
100
50
0
-50
-100
100
mA
100
µA
CL= 1 µF
VOUT = 5V
0123 45
TIME (ms)
Load Transient Response
80
60
40
20
0
-20
-40
CL= 10 µF
-60
VOUT = 5V
100
mA
100
µA
0 4 8 12 16 20
TIME (ms)
LP2951
Enable Transient
7
6
LL= 1 µF
5
4
3
2
IL = 10 mA
1
0
VIN = 8V
CL = 10 µF VOUT = 5V
2
0
-2
-100 0 100 200 300 400 500 600 700
TIME (µs)
Output Impedance
10
5 I0 = 100 µA
2 I0 = 1 mA
1
0.5
0.2
0.1
0.05
I0 = 100 mA
VOUT = 5V
CL= 1 µF
0.02
0.01
10 100
1K 10K 100K 1M
FREQUENCY (Hz)
Ripple Rejection
90
80
70
IL = 0
60
50
40 CL = 1 µF
30
VIN = 6V
VOUT = 5V
20
101 102 103
IL = 100 µA
104 10 106
FREQUENCY (Hz)
Ripple Rejection
90
80
70 IL = 1 mA
60
CL = 1 µF
VIN = 6V
VOUT = 5V
50
40
30
20
101
IL = 10 mA
102 103 104
105 106
FREQUENCY (Hz)
February 1999
3-41
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