© 2008 Exar Corporation

LP2950/51

PARAMETER

CONDITIONS

(Note 2)

LP2951AC

Min. Typ.

Max.

LP2951C

Min. Typ. Max.

UNITS

8-Pin Versions only (Continued)

Reference Voltage

Temperature

Coefficient

20

50

ppm/°C

Feedback Pin Bias

Current

Temperature

Coefficient

0.1

0.1

nA/°C

Error Comparator

Output Leakage

Current

0.01 1

0.01

1

μ

A

Output Low Voltage

150

250

150

250

mV

Upper Threshold

Voltage

(Note 7)

40

60

40

60

mV

Lower Threshold

Voltage

(Note 7)

75

95

75

95

mV

Hysteresis

(Note7)

15

15

mV

Shutdown Input

Input logic Voltage

Low (Regulator ON)

High (Regulator OFF)

2.0

1.3

0.7

2.0

1.3

0.7

V

V

Shut down Pin Input

Current

30

675

50

800

30

675

50

800

μ

A

μ

A

Regulator Output

Current in Shutdown

(Note 8)

3

10

3

10

μ

A

8 Pin SOIC

128.4

°C/W

Thermal

3 Pin TO-92

131.

9

°C/W

Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are

covered under the specification for thermal regulation.

performance characteristics for line regulation versus temperature and load current.

Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential. At

very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be taken into account.

Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To

is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.

Note 9: All typical values are not guaranteed. The value could vary from lot to lot.

Rev G

LP2950-5 Low Dropout Linear Regulators

3