+

Current

Limit

IN

OUT

GND

LM3480

PNP

Bandgap

Reference

Thermal

Shutdown

NPN

LM3480

SNVS011H – JUNE 1999 – REVISED SEPTEMBER 2015

www.ti.com

7 Detailed Description

7.1 Overview

The LM3480 is an integrated linear voltage regulator with inputs that can be as high as 30 V. It ensures a

maximum dropout of 1.2 V at the full load of 100 mA. The LM3480 has different output options including 3.3-V, 5-

V, 12-V, and 15-V outputs, making LM3480 the tiny alternative to industry standard LM78Lxx series and similar

devices.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 3.3-V, 5-V, 12-V, and 15-V Versions Available

The 3.3-V, 5-V, 12-V, and 15-V versions of LM3480 series are intended as tiny alternatives to industry standard

LM78Lxx series and similar devices.

7.3.2 1.2-V Ensured Maximum Dropout

The 1.2-V quasi-low dropout of the LM3480 series devices make them a nice fit in many application where the 2-

V to 2.5-V dropout of LM78Lxx series devices precludes their use.

7.4 Device Functional Modes

The 3.3-V member of LM3480 can operate with an input of 5 V ±5%, its tiny SOT-23 package and quasi-low

dropout makes it suitable for providing a very tiny, 3.3-V, 100-mA bias supply from 5-V power supply.

10

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