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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.
| Typ | Titel | Datum | ||
|---|---|---|---|---|
| * | Data sheet | LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter datasheet (Rev. A) | 01 Mai 2013 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Technical article | Charge pumps: An often unconsidered method of DC/DC conversion | PDF | HTML | 17 Jul 2015 | |
| Technical article | Charge pump, inductor-based converter or LDO? | PDF | HTML | 19 Jun 2015 | |
| White paper | The Forgotten Converter | 15 Jun 2015 | ||
| EVM User's guide | AN-1547 LM2771 Evaluation Board (Rev. A) | 30 Apr 2013 |
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