TPS62125

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

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Product details

Parameters

Vin (Min) (V) 3 Vin (Max) (V) 17 Vout (Min) (V) 1.2 Vout (Max) (V) 10 Iout (Max) (A) 0.3 Iq (Typ) (mA) 0.013 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)

Features

  • 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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Description

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
* Datasheet TPS62125 3-V to 17-V, 300-mA Step-Down Converter With Adjustable Enable Threshold and Hysteresis datasheet (Rev. E) May 19, 2017
White papers Extending Battery Life in Smart E-Locks (Rev. A) Jun. 04, 2020
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
White papers Benefits of a Resistor-to-Digital Converter in Ultra-Low Power Supplies Oct. 14, 2019
User guides TPS62125EVM-044 User's Guide (Rev. B) Jul. 24, 2019
Application notes Methods of output-voltage adjustment for DC/DC converters Jun. 14, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application notes Performing Accurate PFM Mode Efficiency Measurements (Rev. A) Dec. 11, 2018
Application notes QFN and SON PCB Attachment (Rev. B) Aug. 24, 2018
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application notes Understanding 100% mode in low-power DC/DC converters Jun. 22, 2018
Application notes A Topical Index of TI Low Power Buck DC/DC Application Notes Jan. 17, 2018
Application notes Achieving a clean startup by using a DC/DC converter with a precise enable-pin t Oct. 24, 2017
Application notes Extending the Soft Start Time Without a Soft Start Pin (Rev. B) Jun. 15, 2017
Technical articles Cutting the last wire to unleash Industry 4.0 Oct. 27, 2016
Application notes Testing tips for applying external power to supply outputs without an input volt Oct. 24, 2016
Application notes Understanding frequency variation in the DCS-Control(TM) topology Oct. 30, 2015
Application notes Basic Calculation of a Buck Converter's Power Stage (Rev. B) Aug. 17, 2015
Technical articles What is that giant tantalum cap on the input of the EVM? May 20, 2015
Application notes Five steps to a great PCB layout for a step-down converter Jan. 29, 2015
Application notes Using the TPS62125 in an Inverting Buck-Boost Topology (Rev. B) Jul. 11, 2014
Technical articles Oops! I need more current… May 30, 2014
Application notes High-efficiency, low-ripple DCS-Control offers seamless PWM/pwr-save transitions Jul. 25, 2013
Application notes 4Q 2012 Issue Analog Applications Journal Sep. 25, 2012
Application notes Harnessing wasted energy in 4- to 20-mA current-loop systems Sep. 25, 2012
Application notes How to Measure the Control Loop of DCS-Control Devices (Rev. A) Aug. 09, 2012
Application notes 3Q 2012 Issue Analog Applications Journal Jul. 17, 2012
Application notes Easy solar-panel maximum-power-point tracking for pulsed-load applications Jul. 17, 2012
Application notes Designing for Lowest Noise with the TPS62125 Jun. 13, 2012
Application notes Optimizing the TPS62125 Output Filter May 02, 2012
Application notes Design considerations for a resistive feedback divider in a DC/DC converter Apr. 26, 2012
Application notes Understanding the Absolute Maximum Ratings of the SW Node (Rev. A) Jan. 13, 2012
Application notes Choosing an Appropriate Pull-up/Pull-down Resistor for Open Drain Outputs Sep. 19, 2011
Application notes 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

EVALUATION BOARDS Download
document-generic User guide
25
Description

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 (...)

Features
  • 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

SIMULATION MODELS Download
SLVM590.ZIP (41 KB) - PSpice Model
SIMULATION MODELS Download
SLVM683.TSC (145 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM684.ZIP (33 KB) - TINA-TI Spice Model
SIMULATION TOOLS Download
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 (...)
Features
  • 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
  • (...)
GERBER FILES Download
SLVC410A.ZIP (338 KB)
GERBER FILES Download
SLVC780.ZIP (138 KB)

Reference designs

REFERENCE DESIGNS Download
Switched capacitor integrated buck 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
REFERENCE DESIGNS Download
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 (...)
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REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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 (...)
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REFERENCE DESIGNS Download
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 (...)
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REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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

Package Pins Download
WSON (DSG) 8 View options

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