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Power/Alternative Energy  

Linear touts 100% duty cycle DC/DC controller

Posted: 28 Dec 2007     Print Version  Bookmark and Share

Keywords:switching regulator  controller  DC/DC converter 

Linear Technology Corp. says its LT3742, a 100 per cent duty cycle dual output step-down switching regulator DC/DC controller produces output voltages up to 30V for applications including stepper motors, industrial controls, automotive, distributed power and telecom systems. LT3742 can be configured with one side as a step-down voltage regulator and the other a Super Capacitor charger (current source) for capacitor values up to several farads, a useful feature in robotic applications when longer hold-up times are needed or where high peak currents are required.

The LT3742's 100 per cent duty cycle allows the output voltage to be very close to the input voltage, suited for battery-powered systems. The 4V to 30V input voltage range enables operation from intermediate bus voltages. A simple step-up DC/DC converter is incorporated to generate its own gate drive voltage and also eliminates the extra parts required to drive the high-side MOSFETs. The on-board gate driver powers a single external N-Channel MOSFET for each output, enabling output currents up to 5A.

A constant 500kHz operating frequency with current mode control provides fast transient response and easy compensation. Output current sensing is precisely measured by monitoring the voltage drop across a sense resistor and protects the converter during overload and short circuit conditions. The LT3742 also has adjustable soft-start to control the output voltage ramp time and a power good signal for each output.

The LT3742 is offered in a 4-by-4mm QFN-24 package. Pricing for 1,000-piece quantities begins at Rs.90.76 ($2.30) each.




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