PNP

GND

SCHOTTKY DIODE

LP2986

PNP

GND

LP2986

LP2986

SNVS137I – MARCH 1999 – REVISED SEPTEMBER 2015

www.ti.com

A typical aluminum electrolytic can exhibit an ESR increase of 50× when going from +20°C to

−40°C. Also, some

aluminum electrolytics can not be used below

−25°C because the electrolyte will freeze.

8.2.2.4 Reverse Input-Output Voltage

The PNP power transistor used as the pass element in the LP2986 has an inherent diode connected between

the regulator output and input.

During normal operation (where the input voltage is higher than the output) this diode is reverse-biased.

However, if the output voltage is pulled above the input, or the input voltage is pulled below the output, this diode

will turn ON and current will flow into the regulator OUT pin.

Figure 33. Inherent Diode

pin), which can damage the part.

In any application where the output voltage may be higher than the input, an external Schottky diode must be

0.3 V (see Absolute Maximum Ratings).

Figure 34. Inherent and External Schottky Diodes

8.2.2.5 WSON Package Devices

The LP2986 is offered in the 8-pin WSON surface mount package to allow for increased power dissipation

compared to the 8-pin SOIC-8 and 8-pin VSSOP. For details on WSON thermal performance as well as

mounting and soldering specifications, refer to WSON Mounting.

18

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