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).
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | TPS61251 Boost Converter for Battery Backup Charging With Adjustable Constant Current and Snooze Mode datasheet (Rev. C) | PDF | HTML | 10 Apr 2019 |
| Application note | QFN and SON PCB Attachment (Rev. C) | PDF | HTML | 06 Dec 2023 | |
| Application note | Performing Accurate PFM Mode Efficiency Measurements (Rev. A) | 11 Dec 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 | PDF | HTML | 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 |
For additional terms or required resources, click any title below to view the detail page where available.
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WSON (DSG) | 8 | Ultra Librarian |
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