TPS76301-Q1

OUT

IN

FB

GND

EN

VREF

TPS76316/18/25/30/33/50-Q1

OUT

IN

GND

EN

VREF

Current Limit/

Thermal

Protection

Current Limit/

Thermal

Protection

10

TPS763-Q1, TPS76301-Q1, TPS76316-Q1, TPS76318-Q1

TPS76325-Q1, TPS76330-Q1, TPS76333-Q1, TPS76350-Q1

SGLS247B – SEPTEMBER 2011 – REVISED MARCH 2016

www.ti.com

Product Folder Links: TPS763-Q1 TPS76301-Q1 TPS76316-Q1 TPS76318-Q1 TPS76325-Q1 TPS76330-Q1

TPS76333-Q1 TPS76350-Q1

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Copyright © 2011–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The TPS763xx-Q1 low-dropout (LDO) regulators are new families of regulators which have been optimized for

use in battery-operated equipment and feature low dropout voltages, low quiescent current (140

μA), and an

enable input to reduce supply currents to less than 2

μA when the regulator is turned off.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Regulator Protection

The TPS763xx-Q1 pass element has a built-in back diode that safely conducts reverse currents when the input

voltage drops below the output voltage (for example, during power down). Current is conducted from the output

to the input and is not internally limited. If extended reverse voltage is anticipated, external limiting might be

appropriate.

The TPS763xx-Q1 also features internal current limiting and thermal protection. During normal operation, the

TPS763xx-Q1 limits output current to approximately 800 mA. When current limiting engages, the output voltage

scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross

device failure, care should be taken not to exceed the power dissipation ratings of the package. If the

temperature of the device exceeds 165°C, thermal-protection circuitry shuts it down. Once the device has cooled

down to below 140°C, the regulator operation resumes.