Date: 03/05/2011

2 Amp sync step-down DC/DC converters from Torex

Torex Semiconductor has developed a new 2A synchronous step-down DC/DC converter. The XC9242/XC9243 series are synchronous step-down DC-DC converters capable of supporting output currents up to 2A with on-chip 0.11O (TYP.) P-channel MOS driver transistor and a 0.12O (TYP.) N-channel MOS switch transistor.

The operating voltage range is 2.7V to 6.0V. The output voltage can be freely set from 0.9V using the 0.8V ±2.0% internal reference voltage and an external resistor ladder. A switching frequency of 1.2MHz (±15%) or 2.4MHz (±15%) can be selected as appropriate for the application. PWM control (XC9242) and PWM/PFM automatic switching control (XC9243) can be selected for the control method, and low output ripple and high efficiency are achieved across a full range of load currents. The new series can be used with ceramic capacitors.

The XC9242/XC9243 series has an internal soft-start function that quickly starts the output power supply in 1ms (TYP.). The current limiting function is set to 4.0A (TYP.) and is ideal for large-current applications. A CL high-speed discharge function and UVLO function (forcibly turns off the internal driver transistor at an input voltage of 2.4V TYP. or less) are also built in. The XC9242/XC9243 is available in a small USP-10B package and the series is an environment-friendly product that complies with the EU RoHS Directive and is Pb-free.


For more info visit http://www.torex.co.jp/english/