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发布者:微桥 发布时间:2011/11/11 阅读:5381次    关键字: DC-DC
PT1205-2MHz,3A Synchronous Step-Down Converter


 PT1205-2MHz,3A Synchronous Step-Down Converter PDF文档下载

     GENERAL DESCRIPTION

The PT1205 is a high efficiency synchronous, step-down DC/DC converter. Its input voltage range is from 2.6V to 5.5V and provides an adjustable regulated output voltage from 0.8V to 5V while delivering up to 3A of output current.

The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The switching frequency is set by an external resistor or can be synchronized to an external clock. The 100% duty cycle provides low dropout operation extending battery life in portable systems. Current mode operation with external compensation allows the transient response to be optimized over a wide range of loads and output capacitors. Forced continuous PWM mode appearing on light load could minimizes ripple voltage and reduces the noise and RF interference.

The PT1205 is available in the DFN -10L 3x3 package.

     FEATURES

High Efficiency: Up to 95%

Low RDS(ON) Internal Switches : 110m Ω

Programmable Frequency : 300kHz to 2MHz

No Schottky Diode Required

0.8V Reference Allows for Low Output Voltage

Forced Continuous Mode Operation

Low Dropout Operation : 100% Duty Cycle

RoHS Compliant and 100% Lead (Pb)-Free

     APPLICATIONS

Portable Instruments

Battery-Powered Equipment

Notebook Computers

Distributed Power Systems

IP Phones

Digital Cameras(micro-bridge)

     TYPICAL APPLICATION

 

 

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