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发布者:微桥 发布时间:2011-11-11 阅读:5730次    关键字: DC-DC
PT1311-Synchronous Boost DC/DC Converter


PT1311-High Efficiency Synchronous Boost  DC/DC Converter PDF文档下载

PT1311应用说明

    PT1311 是一款低启动电压,高效率的同步整流升压型直流-直流转换器。输入一节AA 干电池能提供100mA/3.3V电流能力。1.2MHz 开关频率减小了外围元器件尺寸,降低了系统成本。电流模式工作使其具备良好的电源和负载变化的响应,并具有逐开关电感峰值限流。内部环路补偿进一步减少了外围元器件。抗振铃电路减少了由非连续模式工作带来的EMI。PFM 模式提高了轻载时的转换效率。输出短路保护避免了输出短路时对电池的损害。

GENERAL DESCRIPTION

The PT1311 is a high efficiency synchronous fixed frequency step-up DC/DC converter. The device is available in an adjustable version and fixed output voltages of 3.3V or 5.0V. Supply current during operation is only 25μA and drops to ≤1μA in shutdown. The 0.85V to 4.2V input voltage range makes the PT1311 ideally suited for single Li-Ion battery  or single AA battery applications. Automatic Burst Mode operation increases efficiency at light loads, further extending battery life. Switching frequency is internally set at 1.2MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Anti-ringing control circuitry reduces EMI concerns by damping the inductor in DCM mode. The internal short protect circuitry can protect battery when output short to ground.  The PT1311 is available in a SOT23-6 package.

FEATURES
 High Efficiency: Up to 93%
 Very Low Quiescent Current: Only 25μA During Operation
 600mA Output Current
 0.85V to 4.2V Input Voltage Range
 1.2MHz Constant Frequency Operation
 No Schottky Diode Required
 Anti-ringing Control Minimizes EMI
 Output Short Protect
 Shutdown Mode Draws≤1μA Supply Current
 Current Mode Operation for Excellent Line and Load Transient Response
 Over temperature Protected
 Feedback Voltage Auto Detect
 SOT23-6 Package

APPLICATIONS
 Li-ion Battery Chargers                                   
 USB Audio Devices
 Wireless Mice
 Digital Still Cameras
 MP3/MP4 Players
 Portable Instruments

TYPICAL APPLICATION DIAGRAM

 

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