3.5-MHz, 1.5-A, 92% efficient boost converter, adjustable input current Limit, ±10% current accuracy


Product details


Vin (Min) (V) 2.3 Vin (Max) (V) 6 Vout (Min) (V) 3 Vout (Max) (V) 6.5 Switch current limit (Typ) (A) 1.5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 3500 Switching frequency (Max) (kHz) 3500 Iq (Typ) (mA) 0.03 Features Synchronous Rectification Duty cycle (Max) (%) 100 Operating temperature range (C) -40 to 85 Rating Catalog open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

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


  • Resistor Programmable Input Current Limit
    • ±10% Current accuracy at 500 mA over full temperature range
    • Programmable from 100 mA up to 1500 mA
  • Snooze mode draws only 2 µA (typical) quiescent current
  • Designed to charge large capacitor values in the Farad range
  • Up to 92% Efficiency
  • Power good indicates appropriate output voltage level even in shutdown
  • VIN range from 2.3 V to 6 V
  • Adjustable output voltage up to 6.5 V
  • 100% Duty-cycle mode when VIN > VOUT
  • Load disconnect and reverse current protection
  • Short-circuit protection
  • Typical operating frequency 3.5 MHz
  • Available in a 2 × 2-mm WSON-8 package
  • Create a custom design using the TPS61251 with the WEBENCH® Power Designer
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The TPS61251 device provides a power supply solution for products powered by either a three-cell, NiCd or NiMH battery, or a one-cell Li-Ion or Li-polymer battery. The wide input voltage range is ideal to power portable applications like mobile phones, solid state drives (SSD) and wireless modems. The converter is designed to charge large capacitors in the Farad range to support battery back up applications. During capacitor charging, the TPS61251 device is working as a constant current source until VOUT has reached its programmed value. The charge current can be programmed by an external resistor RILIM and provides a ±10% accuracy for the 500-mA average input current limit.

The TPS61251 device in combination with a reservoir capacitor allows the converter to provide high current pules that would exceed the capability of the suppling circuit (PC slot, USB) and keeps the slot power safely within its capabilities. During light loads the device automatically enters an enhanced power save mode (snooze mode), which allows the converter to maintain the required output voltage, while only drawing 2 µA from the battery. This allows maximum efficiency at lowest quiescent currents.

TPS61251 device allows the use of small inductors and input capacitors to achieve a small solution size. During shutdown, the load is completely disconnected from the battery and will not discharge either the battery nor the charged bulk capacitor. The TPS61251 device is available in a 8-pin QFN package measuring 2 × 2 mm (DSG).

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Technical documentation

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Type Title Date
* Data sheet TPS61251 Boost Converter for Battery Backup Charging With Adjustable Constant Current and Snooze Mode datasheet (Rev. C) Apr. 10, 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 Calculating and Measuring the No Load Input Current of the Boost Converter Sep. 23, 2016
Application note Five Steps to a Good PCB Layout of the Boost Converter May 03, 2016
White paper Complete Wireless M-Bus Solution (Rev. B) Nov. 05, 2014
Application note Design considerations for a resistive feedback divider in a DC/DC converter Apr. 26, 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
User guide TPS61251 Evaluation Module Aug. 26, 2010

Design & development

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Hardware development

document-generic User guide

This TPS61251EVM-517contains the Texas Instruments 3.25 MHz, up to 6.5 V, step-up DC-DC converter TPS61251 with an adjustable input current limit. The user's guide includes EVM specifications, recommended test setup, the schematic diagram, bill of materials, the board layout, and test data. The (...)

  • Resistor Programmable Input Current Limit
  • Up to 92% Efficiency
  • VIN Range from 2.3 V to 6.0 V
  • Power Good Indicates the Appropriate Output Voltage Level
  • Adjustable Output Voltage up to 6.5 V
  • 100% Duty-Cycle Mode When VIN > VOUT
  • Load Disconnect and Reverse Current Protection
  • Double-sided, two-active-layer PCB (...)

Design tools & simulation

SLVMAA2A.ZIP (95 KB) - PSpice 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
  • (...)

CAD/CAE symbols

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WSON (DSG) 8 View options

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