LM20343

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SNVS559A – MAY 2008 – REVISED AUGUST 2008

PIN DESCRIPTIONS (continued)

Pin(s)

Name

Description

Application Information

19

EN

Enable or UVLO input

An external voltage divider can be used to set the line undervoltage

lockout threshold. If the EN pin is left unconnected, a 2 µA pull-up

current source pulls the EN pin high to enable the regulator.

20

RT

Internal oscillator frequency adjust input

Normally biased at 550 mV. An external resistor connected between RT

and AGND sets the internal oscillator frequency.

EP

Exposed

Exposed pad

Exposed metal pad on the underside of the package with a weak

Pad

electrical connection to GND. Connect this pad to the PC board ground

plane in order to improve heat dissipation.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Copyright © 2008, Texas Instruments Incorporated

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