LM2771是TI公司的一款电荷泵（无感应器）产品，LM2771是低纹波 250mA 开关电容器降压 DC/DC 转换器，本页介绍了LM2771的产品说明、应用、特性等，并给出了与LM2771相关的TI元器件型号供参考。
LM2771 - 低纹波 250mA 开关电容器降压 DC/DC 转换器 - 电荷泵（无感应器） - DC/DC开关稳压器 - TI公司（Texas Instruments，德州仪器）
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.
- 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)
