LM2771
- Low-Noise Fixed Frequency Operation
- 1.5V Output Voltage
- Li-Ion (3.6V) to 1.5V with 81% Efficiency
- 1.7% Output Voltage Accuracy
- Very Low Output Ripple: 8mV @ 250mA
- Output Currents up to 250mA
- 2.7V to 5.5V Input Range
- Shutdown Disconnects Load from VIN
- 1.1MHz Switching Frequency
- No Inductors…Small Solution Size
- Current Limit and Thermal Protection
- WSON-10 Package (3mm × 3mm × 0.8mm)
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The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output without the use of an inductor. It is capable of supplying loads up to 250mA. The LM2771 operates with an input voltage from 2.7V to 5.5V, and requires only 3 low-cost ceramic capacitors.
The LM2771 uses a regulated 0.5x charge pump to give power conversion efficiencies nearly twice as high as an LDO. Pre-regulated 1.1MHz fixed-frequency switching results in very low ripple and noise on both the input and the output. When output currents are low (<30mA typ.), the part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load range. At input voltages below 3.5V (Typ), the charge pump goes into pass mode, with efficiencies similar to an LDO.
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 | LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter datasheet (Rev. A) | 2013/5/1 | |||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 技術文章 | Charge pumps: An often unconsidered method of DC/DC conversion | PDF | HTML | 2015/7/17 | |||
| 技術文章 | Charge pump, inductor-based converter or LDO? | PDF | HTML | 2015/6/19 | |||
| 白皮書 | The Forgotten Converter | 2015/6/15 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (DSC) | 10 | Ultra Librarian |