LM20333

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SNVS558C – MAY 2008 – REVISED JANUARY 2009

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

SYNC

Frequency synchronization input

An external clock connected to this pin will set the switching frequency.

If left open the device will operate at approximately 200 kHz.

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.

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