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SP7651 Datasheet(PDF) 1 Page - Exar Corporation |
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SP7651 Datasheet(HTML) 1 Page - Exar Corporation |
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1 / 15 page  Rev J: 3/4/07 SP765 Wide Input Voltage Range 3A, 900kHz, Buck Regulator © Copyright 2007 Sipex Corporation FEATURES • 2.5V to 20V Step Down Achieved Using Dual Input • Output Voltage down to 0.8V • 3A Output Capability (Up to 5A with Air Flow) • Built in Low RDSON Power FETs (40 mΩ typ) • Highly Integrated Design, Minimal Components • 900 kHz Fixed Frequency Operation • UVLO Detects Both VCC and VIN • Over Temperature Protection • Short Circuit Protection with Auto-Restart • Wide BW Amp Allows Type II or III Compensation • Programmable Soft Start • Fast Transient Response • High Efficiency: Greater than 92% Possible • Asynchronous Start-Up into a Pre-Charged Output • Small 7mm x 4mm DFN Package • U.S. Patent #6,922,04 The SP7651 is a high voltage synchronous step-down switching regulator optimized for high efficiency. The part is designed to be especially attractive for dual supply, 2V step down with 5V used to power the controller. This lower VCC voltage minimizes power dissipation in the part. The SP765 is designed to provide a fully integrated buck regulator solution using a fixed 900kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The SP765 is available in the space saving 7mm X 4mm DFN package . TYPICAL APPLICATION CIRCUIT DESCRIPTION CBST 6800pF L 4.7uH, Irate=3.87A C 22uF CVCC 2.2uF U SP7651 PGND PGND 2 PGND 3 GND 4 VFB 5 COMP 6 UVIN 7 GND 8 SS 9 VIN 0 VIN VIN 2 VIN 3 LX 4 LX 5 LX 6 NC 7 BST 8 GND 9 GND 20 GND 2 VCC 22 LX 23 LX 24 LX 25 LX 26 DBST CSS 5nF CP 22pF 3.3V 0-3A RSET 2.5kΩ,% GND C3 22uF Notes: 12V VIN 1. U1 Bottom-Side Layout should have three contacts isolated from one another: Vin, SWNODE, and GND. SD101AWS VOUT Rz3 7.5kΩ, 1% Cz3 50pF Cz2 ,000pF R 68.kΩ,% Rz2 5k,1% CF 00pF fs=900Khz +5V VCC ENABLE 2. RSET=54.48/(Vout-0.8V) (KOhm) 6.3V (note 2) 16V Solved by TM SP7651 Wide Input Voltage Range 3Amp 900kHz Buck Regulator SP7651 DFN PACKAGE 7mm x 4mm BOTTOM VIEW Heatsink Pad 1 Connect to Lx Heatsink Pad 2 Connect to GND Heatsink Pad 3 Connect to VIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 PGND PGND PGND GND VFB COMP UVIN GND SS VIN VIN VIN VIN LX LX LX LX VCC GND GND GND BST NC LX LX LX Pin 27 Pin 28 Pin 29 Solved by TM |
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