Thermal

Shutdown

Current

Limit

Bandgap

IN

OUT

EPROM

Logic

GND

EN

Mux

TPS783

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SBVS133A – FEBRUARY 2010 – REVISED NOVEMBER 2014

7 Detailed Description

7.1 Overview

The TPS783 family of low-dropout regulators (LDOs) designed specifically for battery-powered applications

where ultralow quiescent current is a critical parameter. The absence of pulldown circuitry at the output of the

LDO provides the flexibility to use the regulator output capacitor as a temporary backup power supply for a short

period of time (for example, during battery replacement). The TPS783 family is compatible with the TI MSP430

and other similar products. The enable pin (EN) is compatible with standard CMOS logic. This LDO family is

stable with any output capacitor greater than 1.0 µF.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Internal Current Limit

The TPS783 is internally current-limited to protect the regulator during fault conditions. During current limit, the

output sources a fixed amount of current that is largely independent of output voltage. For reliable operation, do

not operate the device in a current-limit state for extended periods of time.

The PMOS pass element in the TPS783 family has a built-in body diode that conducts current when the voltage

at OUT exceeds the voltage at IN. This current is not limited, so if extended reverse voltage operation is

anticipated, external limiting up to the maximum rated current for the device may be required.

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