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
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
WSON (DSG) 8 4 mm² 2 x 2
  • 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
  • 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

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).

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) 10 Apr 2019
Application note Performing Accurate PFM Mode Efficiency Measurements (Rev. A) 11 Dec 2018
Application note QFN and SON PCB Attachment (Rev. B) 24 Aug 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Calculating and Measuring the No Load Input Current of the Boost Converter 23 Sep 2016
Application note Five Steps to a Good PCB Layout of the Boost Converter 03 May 2016
White paper Complete Wireless M-Bus Solution (Rev. B) 05 Nov 2014
Analog design journal Design considerations for a resistive feedback divider in a DC/DC converter 26 Apr 2012
Application note Choosing an Appropriate Pull-up/Pull-down Resistor for Open Drain Outputs 19 Sep 2011
Analog design journal IQ: What it is, what it isn’t, and how to use it 17 Jun 2011
User guide TPS61251 Evaluation Module 26 Aug 2010

Design & development

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Evaluation board

TPS61251EVM-517 — Evaluation Module for TPS61251 3.5MHz, 1.5A Current Limit, 92% Efficient Boost Converter

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 (...)

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Simulation model

TPS61251 Unencrypted PSpice Transient Model Package (Rev. A)

SLVMAA2A.ZIP (95 KB) - PSpice Model
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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WSON (DSG) 8 View options

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