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TPS54120

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Low-Noise 1A Power Supply with Integrated DC-DC Converter and Low-Dropout Regulator

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Data sheet

TPS54120

LAST TIME BUY
Data sheet Order now

Product details

Vin (min) (V) 4.5 Vin (max) (V) 17 Vout (min) (V) 0.8 Vout (max) (V) 6 Iout (max) (A) 1 Iq (typ) (mA) 0.04 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Enable, Power good, Synchronous Rectification Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 2 Control mode current mode Duty cycle (max) (%) 98 Type Converter
Vin (min) (V) 4.5 Vin (max) (V) 17 Vout (min) (V) 0.8 Vout (max) (V) 6 Iout (max) (A) 1 Iq (typ) (mA) 0.04 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Enable, Power good, Synchronous Rectification Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 2 Control mode current mode Duty cycle (max) (%) 98 Type Converter
VQFN (RGY) 24 19.25 mm² 5.5 x 3.5
  • Low-Noise Output: 17 µVRMS 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
  • Low-Noise Output: 17 µVRMS 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

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.

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.
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Technical documentation

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Type Title Date
* Data sheet Low-Noise, 1-A Power Supply with Integrated DC-DC Converter and LDO Regulator datasheet (Rev. C) 22 Jun 2012
User guide TPS54120 Step-Down Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 01 Nov 2021
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) 21 Mar 2018
Technical article Designing a power supply solution for pipeline ADCs – Part 2 04 Sep 2015
Technical article Designing a power supply solution for pipeline ADCs – Part 1 03 Sep 2015
Technical article How to filter out noise in your DC/DC design 18 Aug 2015
Application note Understanding Compensation Network for the TPS54120 (Rev. A) 09 May 2012
Application note Design Procedures for the TPS54120 15 Mar 2012
Application note TPS54120 Sequencing and Tracking 25 Jan 2012
Application note Design Guidelines for TPS54120 as a 3-A Switcher and 1-A Switcher Plus LDO 20 Jan 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS54120EVM-103 — Evaluation Module for TPS54120 1A Power Supply w/ Integrated DC-DC Converter & Low-Dropout Regulator

The Texas Instruments TPS54120EVM-103 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS54120 Low-Noise, 1A Power Supply with Integrated DC-DC Converter and Low-Dropout Regulator. The EVM configuration contains all of the external components required for a (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS54120 PSpice Transient Model

SBVM150.ZIP (41 KB) - PSpice Model
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Calculation tool

SLVC411 — TPS54120 Design Tool Calculator

Supported products & hardware

Supported products & hardware

Products
Buck converters (integrated switch)
TPS54120 — Low-Noise 1A Power Supply with Integrated DC-DC Converter and Low-Dropout Regulator
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Gerber file

TPS54120 Gerber Files

SLVC412.ZIP (678 KB)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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VQFN (RGY) 24 View options
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