LM2771

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低紋波 250mA 開關電容器降壓直流/直流轉換器

產品詳情

Rating Catalog Iout (max) (A) 0.25 Vin (max) (V) 5.5 Vin (min) (V) 2.7 Vout (max) (V) 1.5 Vout (min) (V) 1.5 Features Adjustable current limit, Regulated Switching frequency (min) (kHz) 800 Switching frequency (max) (kHz) 1400 Operating temperature range (°C) -30 to 110 Iq (typ) (μA) 45 Type Charge pump
Rating Catalog Iout (max) (A) 0.25 Vin (max) (V) 5.5 Vin (min) (V) 2.7 Vout (max) (V) 1.5 Vout (min) (V) 1.5 Features Adjustable current limit, Regulated Switching frequency (min) (kHz) 800 Switching frequency (max) (kHz) 1400 Operating temperature range (°C) -30 to 110 Iq (typ) (μA) 45 Type Charge pump
WSON (DSC) 10 9 mm2 3 x 3
  • 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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  • 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.

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.

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.
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類型 標題 下載最新的英語版本 日期
* 數據表 LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter 數據表 (Rev. A) 2013年 5月 1日
選擇指南 電源管理指南 2018 (Rev. K) 2018年 7月 31日
選擇指南 電源管理指南 2018 (Rev. R) 2018年 6月 25日
技術文章 Charge pumps: An often unconsidered method of DC/DC conversion PDF | HTML 2015年 7月 17日
技術文章 Charge pump, inductor-based converter or LDO? PDF | HTML 2015年 6月 19日
白皮書 The Forgotten Converter 2015年 6月 15日
EVM 用戶指南 AN-1547 LM2771 Evaluation Board (Rev. A) 2013年 4月 30日
應用手冊 Application Note 1547 LM2771 Evaluation Board (cn) 最新英語版本 (Rev.A) 2006年 11月 3日

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封裝 引腳 CAD 符號、封裝和 3D 模型
WSON (DSC) 10 Ultra Librarian

訂購和質量

包含信息：
  • RoHS
  • REACH
  • 器件標識
  • 引腳鍍層/焊球材料
  • MSL 等級/回流焊峰值溫度
  • MTBF/時基故障估算
  • 材料成分
  • 鑒定摘要
  • 持續可靠性監測
包含信息：
  • 制造廠地點
  • 封裝廠地點

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