The uP1542 is a compact synchronous-rectified buck controller specifically designed to operate from 5V or 12V supply voltage and to deliver high quality output voltage as low as 0.6V for uP1542S/U (linear OCP).
The uP1542 adopts constant frequency, voltage mode control scheme, featuring easy-to-use, low external component count, and fast transient response. Fixed 300kHz operation provides an optimal level of integration to reduce size and cost of the power supply.
This controller integrates internal MOSFET drivers that support 12V+12V bootstrapped voltage for high efficiency power conversion. The bootstrap diode is built-in to simplify the circuit design and minimize external part count.

Other features include internal soft start, over/under voltage protection, over current protection and shutdown function. With aforementioned functions, this part provides customers a compact, high efficiency, well-protected and cost-effective solutions. This part is available in PSOP8L and WDFN2x2-8L package.

• Power Supplies for Microprocessors or Subsystem Power Supplies 
• Cable Modems, Set Top Boxes, and DSL Modems
• Industrial Power Supplies; General Purpose Supplies 
• 5V or 12V Input DC-DC Regulators
• Low-Voltage Distributed Power Supplies