LP2950 / LP2951
CORPORATION
TYPICAL PERFORMANCE CHARACTERISTICS
(continued)
LP2951 MINIMUM
OPERATING VOLTAGE
LP2951 FEEDBACK
BIAS CURRENT
FEEDBACK CURRENT (µA)
MINIMUM OPERATING VOLTAGE (V)
2.2
2.1
2.0
1.9
1.8
1.7
20
50
LP2951 FEEDBACK
PIN CURRENT
BIAS CURRENT (nA)
10
PIN 7 DRIVEN BY
EXTERNAL SOURCE
0
(REGULATROR RUN
OPEN LOOP)
–50
T
A
= 125˚C
–100
–150
T
A
= 25˚C
–200
T
A
= –55˚C
–250
0
0.5
–2.0 –1.5 –1.0 –0.5
FEEDBACK VOLTAGE (V)
0
–10
–20
1.6
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (˚C)
1D-34
–30
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (˚C)
1D-35
1.0
1D-36
8
COMPARATOR OUTPUT (V)
LP2951 ERROR
COMPARATOR OUTPUT
V
OUT
= 5V
SINK CURRENT (mA)
2.5
LP2951 COMPARATOR
SINK CURRENT
T
A
= 125˚C
100mV
OUTPUT VOLTAGE
CHANGE
50mV
0
LINE TRANSIENT
RESPONSE
6
2.0
4
HYSTERESIS
2
1.5
T
A
= 25˚C
–50mV
8V
6V
4V
0
200
400
TIME (µs)
C
L
= 1µA
I
L
= 1mA
V
OUT
= 5V
1.0
T
A
= –55˚C
0.5
0
NOTE: PULLUP RESISTOR
TO SEPARATE 5V SUPPLY
–2
0
1
4
2
3
INPUT VOLTAGE (V)
5
1D-37
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)
1D-38
INPUT
VOLTAGE
600
800
1D-39
10
OUTPUT IMPEDANCE (OHMS)
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
10
OUTPUT IMPEDANCE
I
O
= 100µA
I
O
= 1mA
I
O
= 100mA
90
RIPPLE REJECTION (dB)
80
70
60
50
40
RIPPLE REJECTION
90
RIPPLE REJECTION (dB)
80
70
60
50
40
30
RIPPLE REJECTION
C
L
= 1µF
V
IN
= 6V
V
OUT
= 5V
I
L
= 1mA
I
L
= 0
V
OUT
= 5V
C
L
= 1µA
I
L
= 100µA
C
L
= 1µF
30 V
IN
= 6V
100
1K
10K
100K
FREQUENCY (Hz)
1M
1D-40
20
10
1
V
OUT
= 5V
10
2
10
3
10
4
10
5
FREQUENCY (Hz)
10
6
1D-41
I
L
= 10mA
20
10
1
10
2
10
3
10
4
10
5
FREQUENCY (Hz)
10
6
1D-42
250
OUTPUT VOLTAGE
CHANGE (mV)
200
150
100
50
0
–50
–100
100mA
100µA
0
LOAD TRANISENT
RESPONSE
OUTPUT VOLTAGE
CHANGE (mV)
80
60
40
20
0
–20
–40
–60
100mA
100µA
0
LOAD TRANSIENT
RESPONSE
OUTPUT
VOLTAGE (V)
7
6
5
4
3
2
LP2951
ENABLE TRANSIENT
C
L
= 1µF
I
L
= 10mA
V
IN
= 8V
C
L
= 10µF
V
OUT
= 5V
LOAD CURRENT
LOAD CURRENT
C
L
= 1µF
V
OUT
= 5V
C
L
= 10µF
V
OUT
= 5V
SHUTDOWN
PIN VOLTAGE (V)
1
0
2
0
–2
–100 0
1
2
3
TIME (ms)
4
5
1D-43
4
8
12
TIME (ms)
16
20
1D-44
100 200 300 400 500 600 700
TIME (µs)
1D-45
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CALOGIC [ CALOGIC, LLC ]
