TPS799 datasheet(11/49 Pages) TI2

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7 Detailed Description

7.1 Overview

The TPS799 low-dropout (LDO) regulator combines the high performance required of many RF and precision

analog applications with ultra-low current consumption. High PSRR is provided by a high-gain, high-bandwidth

error loop with good supply rejection at very low headroom (VIN – VOUT). A noise-reduction pin is provided to

bypass noise generated by the band-gap reference and to improve PSRR, while a quick-start circuit quickly

charges this capacitor at start-up. The combination of high performance and low ground current also make this

device an excellent choice for portable applications. This device has thermal and overcurrent protection, and is

fully specified from –40°C to +125°C.

The TPS799 also features inrush current protection with an EN toggle start-up, and overshoot detection at

the output. When the EN toggle is used to start the device, current limit protection is immediately activated,

restricting the inrush current to the device. If voltage at the output overshoots 5% from the nominal value,

a pulldown resistor reduces the voltage to normal operating conditions, as shown in the Functional Block

Diagrams.

7.2 Functional Block Diagrams

Thermal

Shutdown

UVLO

Current

Limit

2µA

Overshoot

Detect

500k

Quickstart

1.193V

Bandgap

OUT

GND

400Ω

Figure 7-1. Fixed-Voltage Versions

Thermal

Shutdown

UVLO

Current

Limit

3.3MΩ

Overshoot

Detect

500k

1.193V

Bandgap

OUT

GND

400Ω

Figure 7-2. Adjustable-Voltage Versions

www.ti.com

TPS799

SBVS056L – JANUARY 2005 – REVISED FEBRUARY 2022

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