LP2951 datasheet(10/30 Pages) MICROCHIP

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LP2951

DS20005736B-page 10



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Shutdown Input Current

ISHDN

—

µA

VSHUTDOWN = 2.4V

—

100

µA

—

450

600

µA

VSHUTDOWN = 30V

—

700

µA

Regulator Output Current

in Shutdown

—

µA

Note 9

—

µA

ELECTRICAL CHARACTERISTICS (CONTINUED)

Electrical Characteristics: Unless otherwise indicated, TA = +25°C

Parameters

Symbol

Min.

Typ.

Max.

Units

Conditions

Note 1: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by

the total temperature range.

2: 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 in the specification for thermal regulation.

3: Line regulation for the LP2951 is tested at 150°C for IL = 1 mA. For IL = 100 µA and TJ = 125°C, line regu-

lation is guaranteed by design to 0.2%. See Typical Performance Characteristics for line regulation versus

temperature and load current.

4: 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.

5: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipa-

tion is applied, excluding load or line regulation effects. Specifications are for a 50 mA load pulse at VIN =

30V (1.25W pulse) for t = 10 ms.

6: Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the

nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage

change, multiply by the error amplifier gain = VOUT/VREF =(R1 + R2)/R2. For example, at a programmed

output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x

5V/1.235V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the drop-

out warning occurring at typically 5% below nominal, 7.5% guaranteed.

7: VREF ≤ VOUT ≤ (VIN – 1 V), 2.3V ≤ VIN ≤ 30V, 100 µA < IL ≤ 100 mA, TJ ≤ TJMAX.

8: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by

the total temperature range.

9: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, with Feedback pin tied to 5V Tap.

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