LP2950 / LP2951

CORPORATION

CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

TEMPERATURE (˚C)

2.2

1.6

–75

150

1D-34

LP2951 MINIMUM

OPERATING VOLTAGE

–50 –25 0

25 50 75 100 125

2.0

1.8

1.7

2.1

1.9

FEEDBACK VOLTAGE (V)

50

–250

–2.0

1.0

1D-36

LP2951 FEEDBACK

PIN CURRENT

–100

–150

–200

–1.5

–1.0

0.5

0

–0.5

–50

0

PIN 7 DRIVEN BY

EXTERNAL SOURCE

(REGULATROR RUN

OPEN LOOP)

TEMPERATURE (˚C)

20

–30

–75

150

1D-35

LP2951 FEEDBACK

BIAS CURRENT

–50 –25 0

25 50 75 100 125

10

0

–10

–20

INPUT VOLTAGE (V)

8

–2

5

1D-37

LP2951 ERROR

COMPARATOR OUTPUT

6

4

2

0

4

3

2

1

0

NOTE: PULLUP RESISTOR

TO SEPARATE 5V SUPPLY

HYSTERESIS

TIME (

µs)

100mV

4V

800

1D-39

LINE TRANSIENT

RESPONSE

0

200

400

600

0

8V

6V

50mV

–50mV

OUTPUT LOW VOLTAGE (V)

2.5

0.0

0.0

0.9

1D-38

LP2951 COMPARATOR

SINK CURRENT

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

2.0

1.5

1.0

0.5

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

FREQUENCY (Hz)

10

0.01

10

1M

OUTPUT IMPEDANCE

100

1K

100K

10K

0.1

1

0.02

0.05

0.2

0.5

2

5

1D-40

FREQUENCY (Hz)

90

20

1D-42

RIPPLE REJECTION

80

70

60

50

40

30

= 5V

FREQUENCY (Hz)

90

20

1D-41

RIPPLE REJECTION

80

70

60

50

40

30

TIME (ms)

250

100

µA

5

1D-43

LOAD TRANISENT

RESPONSE

50

100mA

150

4

3

2

1

0

200

100

0

–50

–100

TIME (

µs)

1D-45

LP2951

ENABLE TRANSIENT

–100

700

0

100 200 300 400 500 600

7

–2

0

2

0

1

2

3

4

5

6

TIME (ms)

80

100

µA

20

1D-44

LOAD TRANSIENT

RESPONSE

0

100mA

40

16

12

8

4

0

60

20

–20

–40

–60

OUT

V

= 5V