LP3961, LP3964

SNVS056J – MAY 2000 – REVISED JUNE 2015

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The total output noise specification for LP396x is presented in the Electrical Characteristics table. The output

noise density at different frequencies is represented by a curve under typical performance characteristics.

8.2.2.8 Shutdown Operation

A CMOS logic level signal at the shutdown (SD) pin will turnoff the regulator. Pin SD must be actively terminated

through a 10-k

Ω pullup resistor for a proper operation. If this pin is driven from a source that actively pulls high

and low (such as a CMOS rail-to-rail comparator), the pull-up resistor is not required. This pin must be tied to the

IN pin if not used.

8.2.2.9 Maximum Output Current Capability

LP3961 and LP3964 can deliver a continuous current of 800 mA over the full operating temperature range. A

heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of

the application. Under all possible conditions, the junction temperature must be within the range specified under

operating conditions. The total power dissipation of the device is given by:

(4)

(5)

formula:

(6)

LP3961 and LP3964 are available in TO-220, SFM/TO-263, and SOT-223 packages. The thermal resistance

depends on amount of copper area or heat sink, and on air flow.

8.2.3 Application Curves

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