TPS54120,TPS54120RGYR,TPS54120RGYT

Part No.:
TPS54120,TPS54120RGYR,TPS54120RGYT
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Description:
Low-Noise, 1-A Power Supply
File Size:
1296 K
Page:
31 Pages
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Maker:
TI [ TEXAS INSTRUMENTS ]
PCB Prototype

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PCB Datasheet:1PCB Datasheet:1
TPS54120
www.ti.com
SBVS180C – JANUARY 2012 – REVISED JUNE 2012
Low-Noise, 1-A Power Supply
with Integrated DC-DC Converter and Low-Dropout Regulator
1
FEATURES
Low-Noise Output: 17 µV
RMS
at 100 Hz to
1 MHz
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
1.2 MHz
Small Package: 3.5 mm × 5.5 mm QFN-24
DESCRIPTION
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-
sensitive applications.
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.
APPLICATIONS
Telecom Infrastructure
Pico and Femto Base Stations
Powering Sensitive Clocking Distribution
Circuits
Test and Measurement
Powering RF Components: VCOs, Receivers,
ADCs
Professional Audio
FUNCTIONAL BLOCK DIAGRAM
L1
C
DC-DC_OUT
R1
R2
C
BOOT
BOOT PH
V
IN
ON/OFF
VIN
PVIN
EN
RT/CLK
R
RT
C
SS
C2
SS
COMP
LDOIN
LDOEN
VSENSE
OUT
R4
C
OUT
FB
R5
V
(OUT)
TPS54120
NR
GND
C
NR
R3
C1
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
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