SBVS180C – JANUARY 2012 – REVISED JUNE 2012
Low-Noise, 1-A Power Supply
with Integrated DC-DC Converter and Low-Dropout Regulator
Low-Noise Output: 17 µV
at 100 Hz to
Wide Input Voltage Range: 4.5 V to 17 V
High Efficiency: 72% at 1 A, 12V Input
Excellent Load/Line Transient Response
Synchronizable to External Clock: 200 kHz to
Small Package: 3.5 mm × 5.5 mm QFN-24
The TPS54120 combines the high-efficiency of a
step-down switching (dc-dc) converter with a high
power-supply rejection (PSR), low-noise, low-dropout
regulator (LDO) to provide an ultra low-noise power
supply that delivers quiet power rails to noise-
With a wide input range of 4.5 V to 17 V, the
TPS54120 is ideally suited for systems with 12-V
power busses, and supports a 1-A continuous output
current. The output voltage can be set from 0.8 V to
6.0 V using external resistors. The dc-dc converter
and LDO are completely configurable, allowing the
TPS54120 to be used in a wide range of low-noise
applications. In addition, the TPS54120 includes
features such as softstart, switching frequency
synchronization, and a power-good signal.
The device is available in a space-saving, 3.5-mm ×
5.5-mm QFN package, and is specified to operate
over a –40°C to +125°C junction temperature range.
Pico and Femto Base Stations
Powering Sensitive Clocking Distribution
Test and Measurement
Powering RF Components: VCOs, Receivers,
FUNCTIONAL BLOCK DIAGRAM
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated