Servo

Error

Amp

Ref

27kW

8kW

Current

Limit

Charge

Pump

Thermal

Protection

Bandgap

NR

OUT

R

1

R

2

EN

GND

IN

R

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11

TPS732-Q1

www.ti.com

SGLS303F – MAY 2005 – REVISED APRIL 2016

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Copyright © 2005–2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TPS732-Q1 low-dropout linear regulator devices operate with an input voltage down to 1.7 V and support

output voltages down to 1.2 V while sourcing up to 500 mA of load current. These linear regulators use an

NMOS pass element with an integrated 4-MHz charge pump to provide a dropout voltage of less than 250 mV at

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

fact, the TPS732-Q1 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 TPS732-Q1 family of devices also features a

noise reduction (NR) pin that allows for additional reduction of the output noise. The low noise output featured by

the TPS732-Q1 family makes the device well-suited for powering VCOs or any other noise-sensitive load.

7.2 Functional Block Diagram

Fixed voltage version.

7.3 Feature Description

7.3.1 Internal Current Limit

The TPS732-Q1 internal current limit helps protect the regulator during fault conditions. Foldback helps to protect

0.5 V. See Figure 9.

7.3.2 Shutdown

turns the regulator off and drops the ground pin current to approximately 10 nA. When shutdown capability is not

required, use pullup resistor values below 50 k

Ω.