- 制造厂商：TI
- 产品类别：电源管理
- 技术类目：直流/直流开关稳压器 - 电荷泵（无电感器）
- 功能描述：低纹波 250mA 开关电容器降压直流/直流转换器
- 点击这里打开及下载LM2771的技术文档资料
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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.
- 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)
All trademarks are the property of their respective owners.
- Vin (Min) (V)
- 2.7
- Vin (Max) (V)
- 5.5
- Vout (Min) (V)
- 1.5
- Vout (Max) (V)
- 1.5
- Iout (Max) (A)
- 0.25
- Regulated outputs (#)
- 1
- Switching frequency (Min) (kHz)
- 800
- Switching frequency (Max) (kHz)
- 1400
- Iq (Typ) (mA)
- 0.045
- Features
- Adjustable Current Limit
- Rating
- Catalog
LM2771的完整型号有：LM2771SD/NOPB，以下是这些产品的关键参数及官网采购报价：
LM2771SD/NOPB，工作温度：-30 to 110，封装：WSON (DSC)-10，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM2771SD/NOPB的批量USD价格：.341（1000+）
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