SP6134

® SP6134 Dual Supply Synchronous Buck Controller FEATURES ■ 3V to 15V Step Down Achieved Using Dual Input ■ Small 10-Pin MSOP Package ■ 2A 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 ■ Asynchronous Start-Up into a Pre-Charged Output ■ U.S. Patent #6,922,041 VCC 1 GL 2 GND 3 VFB 4 COMP 5 SP6134 10 Pin MSOP 10 BST 9 GH 8 SWN 7 SS 6 UVIN Now Available in Lead Free Packaging APPLICATIONS ■ 12V DPA ■ Communications Systems ■ Graphics Cards DESCRIPTION The SP6134 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 SP6134 is designed to drive a pair of external NFETs using a fixed 600kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The SP6134 is available in the cost and space saving 10-pin MSOP. TYPICAL APPLICATION CIRCUIT VCC = 5V @ 30mA RLF 3.0,5% R3 221k, 1% UVIN R4 100k, 1% DBST MBR0530 CVCC 10µF 6.3V GND 3 0.8V CVCC Ceramic 8050 X5R CF1 100pF U1 1 VCC BST 10 2 SP6134 GL GH 9 3 GND SWN 8 4 VFB SS 7 5 COMP...