LP2951-4.8BM Micrel Semiconductor, LP2951-4.8BM Datasheet - Page 7

• Manufacturer Part Number: LP2951-4.8BM
• Description: 100mA Low-Dropout Voltage Regulator
• Manufacturer: Micrel Semiconductor

LP2950/2951
February 1999
-100
0.05
0.02
0.01
250
200
150
100
100
100
-50
mA
0.5
0.2
0.1
2.2
2.1
2.0
1.9
1.8
1.7
1.6
10
50
-2
A
5
2
1
8
6
4
2
0
0
-75 -50 -25 0 25 50 75 100 125 150
10
0
LP2951
Minimum Operating Voltage
LP2951
Error Comparator Output
Load Transient Response
Output Impedance
I = 1 mA
0
0
I = 100 A
0
100
PULLUP RESISTOR TO
SEPARATE 5V SUPPLY
TEMPERATURE ( C)
INPUT VOLTAGE (V)
1
FREQUENCY (Hz)
1
HYSTERESIS
TIME (ms)
1K
V
2
OUT
2
C = 1 F
V
OUT
L
10K 100K 1M
= 5V
3
I = 100 mA
V
C = 1 F
0
3
= 5V
OUT
L
= 5V
4
4
5
5
100
100
-10
-20
-30
-20
-40
-60
mA
2.5
2.0
1.5
1.0
0.5
0.0
20
10
90
80
70
60
50
40
30
20
80
60
40
20
0
A
0
-75 -50 -25 0 25 50 75 100 125 150
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
10
LP2951
Feedback Bias Current
LP2951
Comparator Sink Current
Load Transient Response
Ripple Rejection
1
OUTPUT LOW VOLTAGE (V)
C = 1 F
V = 6V
V
0
IN
OUT
L
TEMPERATURE ( C)
10
= 5V
FREQUENCY (Hz)
3-41
2
4
TIME (ms)
10
8
3
I = 0
L
10
C = 10 F
V
I = 100 A
12
T = 25 C
T = -55 C
T = 125 C
L
OUT
L
A
A
A
4
= 5V
10
16
20
10
6
-100
-150
-200
-250
100
mV
mV
mV
-50
-50
8V
6V
4V
50
50
90
80
70
60
50
40
30
20
-2
0
7
6
5
4
3
2
1
0
2
0
0
-2.0 -1.5 -1.0 -0.5
-100 0 100 200 300 400 500 600 700
10
Line Transient Response
LP2951
Feedback Pin Current
LP2951
Enable Transient
Ripple Rejection
T = 125 C
I = 1 mA
1
L
PIN 7 DRIVEN BY EXTERNAL
SOURCE (REGULATOR RUN
OPEN LOOP)
A
FEEDBACK VOLTAGE (V)
0
10
FREQUENCY (Hz)
2
T = –55 C
C = 10 F
200
A
I = 10 mA
L
L
TIME ( s)
10
L = 1 F
TIME ( s)
T = 25 C
L
A
3
400
C = 1 F
V = 6V
V
10
C = 1 F
I = 1 mA
V
IN
OUT
L
L
I = 10 mA
V = 8V
V
OUT
4
L
L
0
IN
OUT
600
= 5V
= 5V
10
0.5 1.0
= 5V
5
800
10
6
Micrel
3