DESCRIPTION

The SP6139 is a synchronous step-down switching regulator controller optimized for high efficiency. The part is designed to be especially attractive for dual supply, 12V step down with 5V used to power the controller. This lower VCC voltage minimizes power dissipation in the part. The SP6139 is designed to drive a pair of external NFETs using a fixed 1.3MHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output

short circuit protection. The SP6139 is available in the cost and space saving 10-pin MSOP.

FEATURES

■ 2.5V to 20V Step Down Achieved Using Dual Input

■ Small 10-Pin MSOP Package

■ Up to 15A Ouput Capability

■ Highly Integrated Design, Minimal Components

■ UVLO Detects Both VCC and VIN

■ Short Circuit Protection with Auto-Restart

■ On-Board 1.5Ω sink (2Ω source) NFET Drivers

■ Programmable Soft Start

■ Fast Transient Response

■ High Efficiency: Greater than 94% Possible

■ A Synchronous Start-Up into a Pre-Charged Output

APPLICATIONS

■ DSL Modems

■ Set-Top Boxes

■ 12V VIN Point of Load Apps.