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.