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TOREX: INNOVATIVE MANUAL RESET FUNCTION IN A DUAL-CHANNEL SYNCHRONOUS DC/DC CONVERTER!

2009-03-01
The new XC9515 series from TOREX SEMICONDUCTOR is a dual-channel synchronous step-down DC/DC converter with a voltage detector and built-in delay circuit. The series comes in a tiny QFN-20 package.

The DC/DC converter block operates with a supply voltage range between 2.5V and 5.0V, and provides output voltages that can be factory set in 100mV increments between 1.2V and 4V per channel, with output currents of up to 800mA. Thanks to the minimal ON-resistance of the built-in transistors, the XC9515 series can deliver an efficiency of up to 95% (VIN=5V, VOUT=3.3V) and a stable output current of up to 800mA per channel. The high switching frequency of 1MHz furthermore enables the use of small inductors, which helps designers significantly reduce system size. 

All XC9515 series converters offer a variety of supplemental functions, including safety features like short-circuit protection, thermal shutdown and overcurrent protection. An undervoltage lock out (UVLO) function is also incorporated to shut down the supply if the input voltage falls below 1.8V, thereby preventing anomalous operation and ensuring a normal start after power dips. The voltage detector block can be used to set a time delay by connecting an external capacitor. The voltage detection range extends from 2V to 5.5V (+/-2%) and the devices can output a reset signal at any time with the manual reset function.



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