LM20323

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SNVS557B – 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

NC

No Connection

Recommend connecting this pin to GND.

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.

Absolute Maximum Ratings

(1)

VIN to GND

-0.3V to +38V

BOOT to GND

-0.3V to +43V

BOOT to SW

-0.3V to +7V

SW to GND

-0.5V to +38V

SW to GND (Transient)

-1.5V (< 20 ns)

FB, EN, SS/TRK, COMP, PGOOD to GND

-0.3V to +6V

VCC to GND

-0.3V to +8V

Storage Temperature

-65°C to 150°C

ESD Rating

2kV

(1)

Absolute Maximum Ratings indicate limits beyond witch damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test

conditions, see the Electrical Characteristics.

(2)

The human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor to each pin.

Operating Ratings

VIN to GND

+4.5V to +36V

Junction Temperature

−40°C to + 125°C

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