UC3666中文资料DUAL CHANNEL 800mA HIGH EFFICIENCY STEP-DOWN DC/DC CONVERTER数据手册UTC规格书

描述 Description

The UTC UC3666 is a dual channel high efficiency step-down DC/DC converter with constant frequency and current mode. Amain switch and a synchronous rectifier for high efficiency are contained in each converter, and thus an external Schottky diode is saved. Supply current is only 300μA during normal operation and is reduced to less than 1μA in shutdown mode. The output voltage can be adjusted to as low as 0.6V. With input voltage range from2.5V ~ 5.5V , each converter can deliver 800mA current to the load. Due to the internally fixed 1.8MHz switching frequency , small surface mount inductors and capacitors can be used. It can also run 100% duty cycle for low dropout applications.   The UTC UC3666 is generally used in digital still cameras, portable instruments, slim-type DVD, microprocessors and DSP core supplies, wireless and DSL card, PDAs, smart phones, cellular telephones and so on.

特性 Features

• high efficiency    
• Current mode operation  
• Low quiescent current less than 300uA (Active mode)
• Input voltage varying from 2.5V to 5.5V
• Output current on each channel: 800mA
• Fixed frequency operation
• 0 - 100% full duty ratio in dropout
• 0.6V reference allows low output voltages
• Over-temperature protection circuit
• Shutdown current less than 0.1μA
• RoHS Compliant (100% green available)
• Halogen Free