3V-17V, 300mA Buck Converter With Adjustable Enable Threshold And Hysteresis


Product details


Vin (Min) (V) 3 Vin (Max) (V) 17 Vout (Min) (V) 1.2 Vout (Max) (V) 10 Iout (Max) (A) 0.3 Iq (Typ) (uA) 13 Switching frequency (Min) (kHz) 1000 Switching frequency (Max) (kHz) 1000 Features Enable, Light Load Efficiency, Output Discharge, Power Good, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 85 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

WSON (DSG) 8 4 mm² 2 x 2 open-in-new Find other Buck converters (integrated switch)


  • Wide Input Voltage Range 3 V to 17 V
  • Input Supply Voltage Supervisor (SVS) With Adjustable Threshold and Hysteresis Consuming Typical 6-µA Quiescent Current
  • Wide Output Voltage Range 1.2 V to 10 V
  • Typical 13-µA Quiescent Current
  • 350-nA Typical Shutdown Current
  • Seamless Power Save Mode Transition
  • DCS-Control™ Scheme
  • Low Output Ripple Voltage
  • Up to 1-MHz Switching Frequency
  • Highest Efficiency over Wide VIN and VOUT Range
  • Pin to Pin Compatible with TPS62160/70
  • 100% Duty Cycle Mode
  • Power Good Open Drain Output
  • Output Discharge Function
  • Small 2-mm × 2-mm 8-pin WSON Package
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The TPS62125 device is a high-efficiency synchronous step-down converter optimized for low and ultralow power applications providing up to 300-mA output current. The wide input voltage range of 3 V to 17 V supports 4-cell alkaline and 1- to 4-cell Li-Ion batteries in series configuration as well as 9-V to 15-V powered applications. The device includes a precise low-power enable comparator which can be used as an input supply voltage supervisor (SVS) to address system specific power-up and power-down requirements. The enable comparator consumes only 6-µA quiescent current and features an accurate threshold of 1.2 V typical as well as an adjustable hysteresis. With this feature, the converter can generate a power supply rail by extracting energy from a storage capacitor fed from high impedance sources such as solar panels or current loops. With its DCS-Control scheme the converter provides power-save mode operation to maintain highest efficiency over the entire load current range. At light loads the converter operates in pulse frequency modulation (PFM) mode and transitions seamlessly and automatically in pulse width modulation (PWM) mode at higher load currents. The DCS-Control™ scheme is optimized for low-output ripple voltage in PFM mode in order to reduce output noise to a minimum and features excellent AC load regulation. An open-drain power good output indicates once the output voltage is in regulation.

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Technical documentation

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Type Title Date
* Data sheet TPS62125 3-V to 17-V, 300-mA Step-Down Converter With Adjustable Enable Threshold and Hysteresis datasheet (Rev. E) May 19, 2017
User guide TPS62125 Buck Converter Evaluation Module User's Guide (Rev. C) Jun. 08, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 2021
White paper Extending Battery Life in Smart E-Locks (Rev. A) Jun. 04, 2020
White paper Benefits of a Resistor-to-Digital Converter in Ultra-Low Power Supplies Oct. 14, 2019
Application note Methods of output-voltage adjustment for DC/DC converters Jun. 14, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note Performing Accurate PFM Mode Efficiency Measurements (Rev. A) Dec. 11, 2018
Application note QFN and SON PCB Attachment (Rev. B) Aug. 24, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Understanding 100% mode in low-power DC/DC converters Jun. 22, 2018
Application note A Topical Index of TI Low Power Buck DC/DC Application Notes Jan. 17, 2018
Application note Achieving a clean startup by using a DC/DC converter with a precise enable-pin t Oct. 24, 2017
Application note Extending the Soft Start Time Without a Soft Start Pin (Rev. B) Jun. 15, 2017
Technical article Cutting the last wire to unleash Industry 4.0 Oct. 27, 2016
Application note Testing tips for applying external power to supply outputs without an input volt Oct. 24, 2016
Application note Understanding frequency variation in the DCS-Control(TM) topology Oct. 30, 2015
Application note Basic Calculation of a Buck Converter's Power Stage (Rev. B) Aug. 17, 2015
Technical article What is that giant tantalum cap on the input of the EVM? May 20, 2015
Application note Five steps to a great PCB layout for a step-down converter Jan. 29, 2015
Application note Using the TPS62125 in an Inverting Buck-Boost Topology (Rev. B) Jul. 11, 2014
Technical article Oops! I need more current… May 30, 2014
Application note High-efficiency, low-ripple DCS-Control offers seamless PWM/pwr-save transitions Jul. 25, 2013
Application note 4Q 2012 Issue Analog Applications Journal Sep. 25, 2012
Application note Harnessing wasted energy in 4- to 20-mA current-loop systems Sep. 25, 2012
Application note How to Measure the Control Loop of DCS-Control Devices (Rev. A) Aug. 09, 2012
Application note 3Q 2012 Issue Analog Applications Journal Jul. 17, 2012
Application note Easy solar-panel maximum-power-point tracking for pulsed-load applications Jul. 17, 2012
Application note Designing for Lowest Noise with the TPS62125 Jun. 13, 2012
Application note Optimizing the TPS62125 Output Filter May 02, 2012
Application note Design considerations for a resistive feedback divider in a DC/DC converter Apr. 26, 2012
Application note Understanding the Absolute Maximum Ratings of the SW Node (Rev. A) Jan. 13, 2012
Application note Choosing an Appropriate Pull-up/Pull-down Resistor for Open Drain Outputs Sep. 19, 2011
Application note IQ: What it is, what it isn’t, and how to use it Jun. 17, 2011

Design & development

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

Hardware development

document-generic User guide

The TPS62125EVM-044 evaluation module (EVM) is designed to evaluate and test the operation and functionality of the TPS62125 device.  The TPS62125EVM-044 converts a 4-V to 17-V input voltage to a regulated 3.3-V output voltage that delivers 300 mA. The TPS62125 is a high efficiency and small (...)

  • Wide input voltage range 3 V to 17 V
  • Low power enable comparator with 6-µA quiescent current
  • Adjustable enable threshold and hysteresis
  • Wide output voltage range 1.2 V to 10 V
  • 13-µA quiescent current
  • Advanced DCS-Control™ scheme

Design tools & simulation

SLVM590D.ZIP (226 KB) - PSpice Model
SLVM683.TSC (145 KB) - TINA-TI Reference Design
SLVM684.ZIP (33 KB) - TINA-TI Spice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SLVC410A.ZIP (338 KB)
SLVC780.ZIP (138 KB)

Reference designs

Isolated power and data interface for low-power applications reference design
TIDA-010018 — This reference design provides power and data isolation for low and ultra-low power applications. Generating isolated and non-isolated power rails with a high efficiency and containing a power efficient isolated data interface for three forward- plus one reverse-direction channels. Targeted (...)
document-generic Schematic document-generic User guide
Switched capacitor integrated buck (SCIB) power converter reference design
PMP22510 — This switched capacitor integrated buck (SCIB) converter is a highly-optimized design for use in a high-power, high-density single output power converter, operating from a wide-range 40-V to 60-V input rail to produce a 8.0-V, 5.0-V, 3.3-V or 1.8-V rail up to 40A of load current each phase. This (...)
document-generic Schematic document-generic User guide
Energy Harvesting for Wireless Switch Power Reference Design
TIDA-00690 The TIDA-00690 reference design  offers a solution for energy harvesting switch. The switch, built like a linear dynamo, transforms the mechanical energy into electrical energy. This electrical energy is harvested in an optimal manner, thanks to the TIDA-00690 design. The design allows wireless (...)
document-generic Schematic document-generic User guide
Compact, efficient, 24-V input auxiliary power supply reference design for servo drives
TIDA-010009 — This reference design showcases a method to generate power supplies required in a servo or AC drive including the analog and digtal I/O interfaces, encoder supply, isolated transceivers and digital processing block. This design also implements protection against input reverse polarity, output (...)
document-generic Schematic document-generic User guide
Robust interface reference design for EnDat2.2 absolute encoders
TIDA-010026 — This reference design demonstrates a robust interface to EnDat 2.2 Encoders. That shows EMC immunity, particularly immunity against fast transients such as inverter switching noise. The Encoder supply voltage is configurable and integrates protection against short circuit to prevent damage due to (...)
document-generic Schematic document-generic User guide
480-W, 97% η efficiency, Ultra-Compact (480W/in3), Bi-Directional DC-DC Reference Design
TIDA-00705 — The TIDA-00705 is an ultra-compact (1”x1”x1”) high efficiency bi-directional DC-DC power converter capable of delivering 480W for use in Local Energy Storage (LES) and Battery Back-up power applications, specifically designed for server PSUs embedded with battery backup units (...)
document-generic Schematic document-generic User guide
6W 48V-72Vin Fly-Buck with Primary and Isolated Secondary Load Reference Design
PMP30082 — The PMP30082 reference design shows two stage power supply. The first stage is a fly-buck topology that converts an input of 48V-72V to a primary output voltage of 12V with a maximum load current of 250mA and to an isolated secondary output voltage of 24V with a load current of 160mA. Two Buck (...)
document-generic Schematic document-generic User guide
Highly Efficient Power & Data Transmission for Isolated Low Power Applications Reference Design
TIDA-00459 TIDA-00459 provides a turnkey solution for the design and evaluation of sensor transmitters and other applications requiring  isolated data transmission and isolated power conversion. The design is based on the LaunchPadTM form factor and showcases a unique power saving methode for transmitting (...)
document-generic Schematic document-generic User guide
Low Power Simple and Efficient Voltage Inverter for Optical Networking Modules Reference Design
PMP9760 In this reference design, the TPS62125 provides a simple and efficient voltage inverting circuit to be used for low power negative voltage rails, such as found in optical modules.  This configuration has been tested with a full test report and operation explanation.
document-generic Schematic

CAD/CAE symbols

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WSON (DSG) 8 View options

Ordering & quality

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