The uP3861P is a compact dual-channel synchronous rectified buck controller specifically designed to operate with single 12V supply voltage and to deliver high quality output voltage for high power application. The two channels are operated with 180 degree phase interleaved. The twochannel output voltage has power on sequence set. It adopts external compensated voltage mode control to tightly regulate the feedback voltage to internal 1V reference voltage. The switching frequency is programmable from 50KHz to 400KHz, providing an optimal level of integrating to reduce size and const of the power supply. The uP3861P integrates MOSFET drives that supply 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 under voltage lockout (UVLO), under voltage protection ,over voltage protection (OVP) and user programmable over temperature protection (OTP). With aforementioned functions, this part provides customers a compact, high efficiency, well-protected and cost-effective solutions. This part is available in SOP-20L package.

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