LP2950, LP2951, NCV2951
200
400
200
0
50
0
− 50
I
Load
− 200
− 400
0
0.5
1
1.5
2
t, TIME (ms)
2.5
3
3.5
4
0
1.0
150
100
OUTPUT VOLTAGE CHANGE (mV)
C
L
= 1.0
mF
V
out
= 5.0 V
I
L
= 400
mA
to 75 mA
T
A
= 25°C
80
RIPPLE REJECTION (dB)
LOAD CURRENT (mA)
60
I
L
= 0.1 mA
40
T
A
= 25°C
C
L
= 1.0
mF
V
in
= 6.0 V
V
out
= 5.0 V
10
100
1.0 k
10 k
100 k
V
out
20
f, FREQUENCY (Hz)
Figure 12. Load Transient Response
Figure 13. Ripple Rejection
VOLTAGE NOISE (
μ
V/
√
Hz)
C
L
= 1.0
mF
3.0
I
L
= 100 mA
T
A
= 25°C
V
O
= 5.0 V
LP2951C
SHUTDOWN THRESHOLD VOLTAGE (V)
4.0
1.8
1.6
1.4
1.2
1.0
0.8
− 40 − 20
Output Off"
Output On"
2.0
1.0
C
L
= 100
mF
0
100
1.0 k
10 k
100 k
0
20
40
60
80
100
120
140
160
f, FREQUENCY (Hz)
t, TEMPERATURE (°C)
Figure 14. Output Noise
Figure 15. Shutdown Threshold Voltage
versus Temperature
100
Vout , OUTPUT CURRENT (mA)
80
60
40
20
LP2951CN
0
0
5.0
10
15
20
25
30
35
T
A
= 25°C
T
A
= 75°C
4.0
2.0
0
− 2.0
− 4.0
− 6.0
40
10000
OUTPUT VOLTAGE CHANGE (mV)
ESR (ohms)
V
out
= 5 V
1000
100
10
1
0.1
Unstable Region
Stable Region
100
mF
0.1
mF
Unstable Region for 0.1
mF
capacitor only
Lower unstable region is for 0.1
mF
only.
1
mF
and 100
mF
show no instability with low ESR values.
0
10
20
30
40
50
60
70
80
90
100
Output Current (mA)
0.01
V
in
, INPUT VOLTAGE (V)
Figure 16. Maximum Rated
Output Current
Figure 17. Output Stability versus Output Capacitor
Change
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