LP2982 Datasheet, PDF(6/17 Page) National Semiconductor (TI) – Micropower 50 mA Ultra Low-Dropout Regulator

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LP2982 Datasheet, PDF (6/17 Pages) National Semiconductor (TI) – Micropower 50 mA Ultra Low-Dropout Regulator

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Electrical Characteristics (Continued)

Limits in standard typeface are for TJ = 25ËC, and limits in boldface type apply over the full operating temperature range. Un-

less otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 ÂµF, COUT = 4.7 ÂµF, VON/OFF = 2V.

Symbol

Parameter

Conditions

Typ

LP2982AI-X.X

LP2982I-X.X

Units

(Note 6)

Min

Max

Min

Max

Ripple Rejection

f = 1 kHz

COUT = 10 ÂµF

IO(MAX)

Short Circuit Current

RL = 0 (Steady State)

150

(Note 9)

Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-

vice outside of its rated operating conditions.

Note 2: The ESD rating of pins 3 and 4 is 1 kV.

Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, Î¸JA, and

the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:

The value of Î¸JA for the SOT-23 package is 220ËC/W and the micro SMD package is 320ËC/W. Exceeding the maximum allowable power dissipation will cause ex-

cessive die temperature, and the regulator will go into thermal shutdown.

Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2982 output must be diode-clamped to ground.

Note 5: The output PNP structure contains a diode between the VIN and VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT

will turn on this diode.

Note 6: temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate Nationalâs Average

Outgoing Quality Level (AOQL).

Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.

Note 8: The ON/OFF inputs must be properly driven to prevent possible misoperation. For details, refer to Application Hints.

Note 9: See Typical Performance Characteristics curves.

Typical Performance Characteristics Unless otherwise specified: TA = 25ËC, VIN = VO(NOM) + 1V,

COUT = 4.7 ÂµF, CIN = 1 ÂµF, all voltage options, ON/OFF pin tied to VIN.

Output Voltage vs

Temperature

Output Voltage vs

Temperature

DS012679-4

www.national.com

DS012679-5

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