SP6137HV

® Preliminary SP6137HV Dual Supply Synchronous Buck Controller FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 3V to 28V 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 A Synchronous Start-Up into a Pre-Charged Output VCC 1 GL 2 GND 3 VFB 4 COMP 5 10 BST SP6137H 10 Pin MSOP 9 GH 8 SWN 7 SS 6 UVIN Now Available in Lead Free Packaging APPLICATIONS ■ 12V DPA ■ Communications Systems ■ Graphics Cards DESCRIPTION The SP6137HV 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 SP6137HV is designed to drive a pair of external NFETs using a fixed 900kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The SP6137HV is available in the cost and space saving 10-pin MSOP. TYPICAL APPLICATION CIRCUIT VIN 3.5V - 28V C1 22µF 16V FDS6676S 14.5A, 6mΩ 1 2 3 8 7 6 5 C2 22µF 16V GND VCC = 5V @ 30mA QT 4 RLF 3.0,5% CBST 1µF DBST MBR0530 1 C1, C2 Ceramic 1210 X5R U1 SP6137H VCC GL GND VFB COMP BST 10 GH 9 SWN 8...