Torex Introduces New 2A Synchronous Step-Down DC-DC Converter Series
Torex Semiconductor Ltd. 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. The internal 0.11Ω (TYP.) P-channel MOS driver transistor and a 0.12Ω (TYP.) N-channel MOS switch transistor enable the stable drive of output currents up to 2A together with high efficiency.
The operating voltage range is 2.7 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.
