FEATURES

50-mA LDO

Available in 1.5-V, 1.6-V, and 1.8-V

Fixed-Output and Adjustable Versions

Low Input Voltage Requirement

Down to 1.8 V)

Small Output Capacitor, 0.1-μF

Dropout Voltage Typically 50 mV at 50 mA

Less Than 1 μA Quiescent Current in

Shutdown Mode

Thermal Protection

Over Current Limitation

5-Pin SOT-23 (DBV) Package

APPLICATIONS

Portable Communication Devices

Battery Powered Equipment

PCMCIA Cards

Personal Digital Assistants

Modems

Bar Code Scanners

Backup Power Supplies

SMPS Post Regulation

Internet Audio

DESCRIPTION

The TPS722xx family of LDO regulators is available in

fixed voltage options that are commonly used to power

the latest DSP’s and microcontrollers with an adjustable

option ranging from 1.22 V to 2.5 V. These regulators

can be used in a wide variety of applications ranging

from portable, battery-powered equipment to PC

peripherals. The family features operation over a wide

range of input voltages (1.8 V to 5.5 V) and low dropout

voltage (50 mV at full load). Therefore, compared to

many other regulators that require 2.5-V or higher input

voltages for operation, these regulators can be

operated directly from two AAA batteries. Also, the

typical quiescent current (ground pin current) is low,

starting at 85 μA during normal operation and 1 μA in

shutdown mode. Thus, these regulators can be

operated very efficiently and, in a battery-powered

application, help extend the longevity of the device.

Similar LDO regulators require 1-μF or larger output

capacitors for stability. However, this regulator uses an

internal compensation scheme that stabilizes the

feedback loop over the full range of input voltages and

load currents with output capacitances as low as

0.1-μF. Ceramic capacitors of this size are relatively

inexpensive and available in small footprints.

This family of regulators is particularly suited as a

portable power supply solution due to its minimal board

space requirement and 1.8-V minimum input voltage.

Being able to use two off-the-shelf, AAA, batteries

makes system design easier and also reduces

component cost. Moreover, the solution will be more

efficient than if a regulator with a higher input voltage is

used.