1 Features

1• Stable With or Without Capacitors of All Types

• Input Voltage Range of 1.7 V to 5.5 V

• Ultralow Dropout Voltage: 30 mV Typical (150-mA

Load)

• Excellent Load Transient Response—With or

Without Optional Output Capacitor

• New NMOS Topology Provides Low Reverse

Leakage Current

• Low Noise: 30 μV RMS Typical (10 kHz to 100 kHz)

• 0.5% Initial Accuracy

• 1% Overall Accuracy Over Line, Load, and

Temperature

• Less Than 1-μA Maximum I Q in Shutdown Mode

• Thermal Shutdown and Specified Minimum and

Maximum Current Limit Protection

• Available in Multiple Output Voltage Versions

– Fixed Outputs of 1.20 V to 5 V

– Adjustable Outputs from 1.2 V to 5.5 V

– Custom Outputs Available

2 Applications

• Smart Grid and Energy

• Building Automation

• Set-Top Boxes

• Medical Equipment

• Test and Measurement

• Point-of-Sale Terminals

• Wireless Infrastructure

3 Description

The TPS731xx family of low-dropout (LDO) linear

voltage regulators uses a new topology: an NMOS pass element in a voltage-follower configuration. This

topology is stable using output capacitors with low

equivalent series resistance (ESR), and even allows

operation without a capacitor. The device also

provides high reverse blockage (low reverse current)

and ground pin current that is nearly constant over all

values of output current.

The TPS731xx uses an advanced BiCMOS process

to yield high precision while delivering very low

dropout voltages and low ground pin current. Current

consumption, when not enabled, is less than 1 μA

and ideal for portable applications. The extremely low

output noise (30 μVRMS with 0.1-μF CNR) is ideal for

powering VCOs. These devices are protected by

thermal shutdown and foldback current limit.