TPS54122RHLT Datasheet, PDF (1/30 Pages) Texas Instruments – Dual-Output 3-A Quiet Supply with Integrated DC-DC Converter and Low-Noise LDO

TPS54122
www.ti.com
SBVS221A – NOVEMBER 2013 – REVISED NOVEMBER 2013
Dual-Output, 3-A, Quiet Supply™
with Integrated DC-DC Converter and Low-Noise LDO
Check for Samples: TPS54122
FEATURES
1
•23 Low-Noise Output: 17 µV_RMS at 10 Hz to
1 MHz
• Provides Two Configurable Supply Rails
• Wide Input Voltage Range: 2.95 V to 5.5 V
• Output Voltage Adjustable from 0.8 V to 3.6 V
• 1% Overall Accuracy
• Excellent Load and Line Transient Response
• Sync to External Clock: 300 kHz to 2 MHz
• Small Package: 3,5-mm × 5,5-mm QFN-24
APPLICATIONS
• Telecom Infrastructure
• Pico and Femto Base Stations
• Powering Sensitive Clocking-Distribution
Circuits
• Test and Measurement
• Powering RF Components: VCOs, Receivers,
ADCs
• Professional Audio
DESCRIPTION
The TPS54122 combines the 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 ultralow-noise power
supply that delivers Quiet Supply rails to noise-
sensitive applications.
With a wide input range of 2.9 V to 5.5 V, the
TPS54122 is ideally suited for systems with 5-V
power busses, and supports a 3-A continuous output
current. The output voltage can be set from 0.8 V to
3.6 V using external resistors. The TPS54122 can be
used in a wide range of low-noise applications
because the dc-dc converter and LDO are completely
configurable. In addition, the TPS54122 includes
features such as soft-start, switching frequency
synchronization, and a power-good signal.
The TPS54122 can also be configured as a dual
supply rail device, supplying a total of 3 A.
The TPS54122 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.
TYPICAL APPLICATION
VIN
VIN
CIN
EN
CBOOT
BOOT
LO
PH
DC-DC_OUT
CSS
RRT
SS
RT/CLK
COMP
C8
TPS54122
VSENSE
PWRGD
CO
R5
R6
LDOIN
R4
PG
BIAS
OUT
LDOEN
NR
FB
CNR
GND
AGND
PGND
RRPG
R1
R2
LDO_OUT
COUT
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.
Quiet Supply is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
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 © 2013, Texas Instruments Incorporated