The HT1541ARTZ is a DC-DC step-down power converter manufactured by HTCSEMI. It is offered in a RoHS compliant, SOT-23-5 package. This converter has an input voltage range of 2.7V to 6.5V and an output voltage of 1.5V. It has an internal power MOSFET with a peak current rating of 1A and a maximum output current of 800mA. This part also provides over-voltage protection with an externally adjustable threshold, short-circuit protection, and a soft-start feature. The converter has a typcial efficiency of over 95% and offers excellent load and line regulation. The device is designed for use in a wide range of portable applications such as handheld instruments, communications, PDAs, and digital audio players.