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SP7650ER Datasheet(PDF) 1 Page - Exar Corporation |
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SP7650ER Datasheet(HTML) 1 Page - Exar Corporation |
1 / 16 page Date: /5/06 SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator © Copyright 2006 Sipex Corporation 1 Date: 2/16/06 SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator © Copyright 2006 Sipex Corporation FEATURES ■ 2.5V to 28V Step Down Achieved Using Dual Input ■ Output Voltage down to 0.8V ■ 3A Output Capability ■ Built in Low RDSON Power Switches (40 m typ) ■ Highly Integrated Design, Minimal Components ■ 300 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 95% Possible ■ Asynchronous Start-Up into a Pre-Charged Output ■ Small 7mm x 4mm DFN Package ■ U.S. Patent #6,922,041 The SP7650 is a synchronous step-down switching regulator optimized for high efficiency. The part is designed to be especially attractive for dual supply, 12V or 24V distributed power systems stepped down with 5V used to power the controller. This lower VCC voltage minimizes power dissipation in the part and is used to drive the top switch. The SP7650 is designed to provide a fully integrated buck regulator solution using a fixed 300kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The SP7650 is available in the space saving DFN package . TYPICAL APPLICATION CIRCUIT Now Available in Lead Free Packaging DESCRIPTION 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 BOTTOM VIEW Heatsink Pad 1 Connect to Lx Heatsink pad 2 Connect to GND Heatsink pad 3 Connect to VIN PGND PGND GND VFB COMP UVIN GND SS VIN LX LX LX LX VCC GND GND GND BST NC LX LX LX DFN PACKAGE 7mm x 4mm SP7650 PGND VIN VIN VIN CBST 6800pF L1 2.2uH, Irate=4.78A C1 22uF CVCC 2.2uF U1 SP7650 PGND 1 PGND 2 PGND 3 GND 4 VFB 5 COMP 6 UVIN 7 GND 8 SS 9 VIN 10 VIN 11 VIN 12 VIN 13 LX 14 LX 15 LX 16 NC 17 BST 18 GND 19 GND 20 GND 21 VCC 22 LX 23 LX 24 LX 25 LX 26 DBST CSS 47nF CP1 22pF 3.3V 0-3A RSET 21.5k ,1% GND C3 47uF Notes: 12V VIN 1. U1 Bottom-Side Layout should have three contacts isolated from one another: Vin, SWNODE and GND. SD101AWS VOUT RZ3 7.15k ,1% CZ3 150pF CZ2 1,000pF R1 68.1k ,1% RZ2 15k ,1% CF1 100pF fs=300Khz +5V VCC ENABLE 2. RSET=54.48/(Vout-0.8V) (KOhm) 16V 6.3V (note 2) SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator Power Blox TM 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 BOTTOM VIEW Heatsink Pad 1 Connect to Lx Heatsink Pad 2 Connect to GND Heatsink Pad 3 Connect to VIN PGND PGND GND VFB COMP NC LX LX LX LX VCC BST LX LX LX DFN PACKAGE 7mm x 4mm SP7650 PGND SS GND GND GND Pin 27 Pin 28 Pin 29 UVIN VIN VIN VIN VIN GND |
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