Servo

Error

Amp

Ref

27 kW

8 kW

Current

Limit

Thermal

Protection

Bandgap

NR

OUT

R

1

R

2

EN

GND

IN

R

4-MHZ

Charge Pump

TPS731

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SBVS034N – SEPTEMBER 2003 – REVISED DECEMBER 2015

7 Detailed Description

7.1 Overview

The TPS731xx family of low-dropout linear regulators operates down to an input voltage of 1.7 V and supports

output voltages down to 1.2 V while sourcing up to 150 mA of load current. This linear regulator uses an NMOS

pass element with an integrated 4-MHz charge pump to provide a dropout voltage of less than 100 mV at full

load current. This unique architecture also permits stable regulation over a wide range of output capacitors. In

fact, the TPS731xx family of devices does not require any output capacitor for stability. The increased

insensitivity to the output capacitor value and type makes this family of linear regulators an ideal choice when

powering a load where the effective capacitance is unknown.

The TPS731xx family of devices also features a noise reduction (NR) pin that allows for additional reduction of

the output noise. With a noise reduction capacitor of 0.01 µF connected from the NR pin to GND, the TPS73115

suited for powering VCOs or any other noise sensitive load.

7.2 Functional Block Diagrams

Figure 29. Fixed-Voltage Version

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Product Folder Links: TPS731