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UC3666 Datasheet

DUAL CHANNEL 800mA HIGH EFFICIENCY STEP-DOWN DC/DC CONVERTER
 


DESCRIPTION
 
The UTC UC3666 is a dual channel high efficiency step-down
DC/DC converter with constant frequency and current mode. A
main 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 from
2.5V ~ 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.
 



 
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  
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