LP2983 datasheet(5/11 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

device outside of its rated operating conditions.

Note 2: The ESD rating of pin 3 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 temperture is calculated using:

Where the value of

θJ-A for the SOT-23 package is 240˚C/W in a typical PC board mounting. Exceeding the maximum allowable 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 LP2983 output must be diode-clamped to ground.

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

turn on this diode and possibly cause a destructive latch-up condition (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: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.

Note 8: The LP2983 has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as VOUT is

forced down to ground (see Typical Performance Characteristics curves).

LP2983 数据表(PDF) 5 Page - National Semiconductor (TI)

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