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.