TPS61251
- 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).
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技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | TPS61251 Boost Converter for Battery Backup Charging With Adjustable Constant Current and Snooze Mode datasheet (Rev. C) | PDF | HTML | 2019/4/10 | ||
| 應用說明 | QFN and SON PCB Attachment (Rev. C) | PDF | HTML | 2023/12/6 | |||
| 應用說明 | Performing Accurate PFM Mode Efficiency Measurements (Rev. A) | 2018/12/11 | ||||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 應用說明 | Calculating and Measuring the No Load Input Current of the Boost Converter | 2016/9/23 | ||||
| 應用說明 | Five Steps to a Good PCB Layout of the Boost Converter | PDF | HTML | 2016/5/3 | |||
| 白皮書 | Complete Wireless M-Bus Solution (Rev. B) | 2014/11/5 | ||||
| 類比設計期刊 | Design considerations for a resistive feedback divider in a DC/DC converter | 2012/4/26 | ||||
| 應用說明 | Choosing an Appropriate Pull-up/Pull-down Resistor for Open Drain Outputs | 2011/9/19 | ||||
| 類比設計期刊 | IQ: What it is, what it isn’t, and how to use it | 2011/6/17 |
設計與開發
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TPS61251EVM-517 — 適用於 TPS61251 3.5MHz、1.5A 電流限制、92% 高效升壓轉換器的評估模組
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 (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (DSG) | 8 | Ultra Librarian |
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