The PTN78000W is a series of high-efficiency, step-down Integrated Switching Regulator (ISR), that represent the third generation in the evolution of the popular 78ST100 series of products. In new designs it may be considered in place of the 78ST100, PT78ST100, PT5100, and PT6100 series of single in-line pin (SIP) products. The PTN78000 is smaller and lighter than its predecessors, and has either similar or improved electrical performance characteristics. The case-less, double-sided package, also exhibits improved thermal characteristics, and is compatible with TI's roadmap for RoHS and lead-free compliance. Operating from a wide-input voltage range of 7 V to 36 V, the PTN78000 provides high-efficiency, step-down voltage conversion for loads of up to 1.5 A. The output voltage is set using a single external resistor, and may be set to any value within the range, 2.5 V to 12.6 V. The output voltage can be as little as 2 V lower than the input, allowing operation down to 7 V, with an output voltage of 5 V. The PTN78000 has an integral on/off inhibit, and is suited to a wide variety of general-purpose applications that operate off 12-V, 24-V, or 28-V dc power. STANDARD APPLICATION