LP2980-ADJ datasheet(4/9 Pages) NSC

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Electrical Characteristics (Continued)

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, θJ-A, and

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

The value of

θJ-A for the SOT-23 package is 300˚C/W. Exceeding the maximum allowable power dissipation will cause excessive 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 LP2980-ADJ 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 (see Application Hints).

Note 6: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s 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 input 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: T

A = 25˚C, VIN =VO(NOM) + 1V,

L = 1 mA, ON/OFF pin tied to VIN,RADJ = 86.6k, and test circuit is as shown in Basic Application Circuit.

Output Voltage vs. Temperature

DS100001-5

Dropout Characteristics

DS100001-6

Dropout Voltage vs. Temperature

DS100001-7

Dropout Voltage vs. Load Current

DS100001-8

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