SP7652ERL

SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator FEATURES • • • • • • • • • • • • • • • • 2.5V to 28V Dual Input Stepdown Output Voltage down to 0.8V 6A Output Capability Built-in Low RDSON Power FETs (15mΩ typ.) Highly Integrated Design, Minimal Components 600kHz Fixed-frequency Operation UVLO Detects Both Vcc and Vin Over Temperature Protection Short Circuit Protection with Auto-Restart Wide Bandwith 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 #6,922,041 DFN PACKAGE 7mm x 4m m 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 Heatsink Pad 3 Connect toVIN Heatsink Pad 2 Connect to GND TOP VIEW Heatsink Pad 1 Connect to Lx 26 LX 25 LX 24 LX 23 LX 2 2 VCC 21 GND 20 GND 19 GND 18 BST 17 NC 16 LX 15 LX 14 LX SP7652 The SP7652 is a 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 SP7652 is designed to provide a fully integrated buck regulator solution using a fixed 600kHz frequency, PWM voltage mode architecture. Protection features inc lude UVLO, thermal shutdown and output short circuit protection. The SP7652 is available in the space saving DFN package. DESCRIPTION TYPICAL APPLICATION CIRCUIT 00pF 5.KΩ 2.5kΩ ,1% RSET (note 2) nF 2KΩ  2 3 PGND PGND PGND GND VFB COMP UVIN GND SS VIN VIN VIN VIN U SP7652 LX LX LX LX VCC GND GND GND BST NC LX LX LX 26 25 24 23 22 2 20 19 8 7 6 5 4 68.kΩ ,1% VOUT 3.3V 0-6A 47uF Ceramic X5R 6.3V .5uH, Irate=8A 22pF 4 5 6 7 5V VCC CVCC uF CF 00pF 8 9 0 ENABLE VIN 5V - 20V C 22uF CSS 22nF  2 3 5.Ω uF SD0AWS Notes: Notes: .. U bottom-side layout should have U Bottom-Side Layout should have three contacts isolated from one three contacts isolated from one another: nother: VIN, and GND Vin,aSWnODE, SWNODE, and GND 2.2. RSET = 54.48 / (Vout - 0.8V) (kOhm) RSEt= 54.48 (VOut - 0.8V)(kOhmss) GND Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation  These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Storage Temperature ................................................... -65°C to 150°C Vcc................................................................................................... 7V Power Dissipation ..................................................... Internally Limited Vin .................................................................................................. 30V ESD Rating ........................................................................... 2kV HBM Ilx .................................................................................................. 0A Thermal Resistance Øjc ........................................................... 5°C/W BST................................................................................................ 35V LX-BST ...............................................................................-0.3V to 7V LX ........................................................................................-V to 30V All other pins ............................................................-0.3V to Vcc+0.3V ABSOLUTE MAXIMUM RATINGS Unless otherwise specified: -40°C < Tamb < 85°C, -40°C> Cp and R >> RZ 3 Output Load Resistance >> RESR and RDC Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation 9 APPLICATIONS INFORMATION Gain (dB) error Amplifier Gain Bandwidth Product Condition: C22 >> CP1, R1 >> RZ3 20 Log (RZ2/R1) /2π(Rz2)(CP1) /2π(Rz3)(Cz3) /2π(R22)(Cz2) /2π(R1)(Cz3) /2π(R1)(Cz2) Frequency (Hz) Bode Plot of Type III Error Amplifier Compensation. CP1 RZ3 V OUT R1 68.1k, 1% CZ3 CZ2 RZ2 R 5 VFB SET + + - 0.8V 6 COMP CF1 R SET =54.48/ (V OUT -0.8) (kΩ ) Type III Error Amplifier Compensation Circuit Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation 0 SP765X Thermal Resistance APPLICATIONS INFORMATION SP765X Thermal Resistance 4 Layer Board: Top Layer 3ounces Copper GND Layer 1ounce Copper Power Layer ounce Copper Bottom Layer 3ounces Copper Minimum Footprint: 44°C/W Top Layer: 0. square inch No Vias to other 3 Layers Medium Footprint: 36°C/W Top Layer: 0.7 square inch Vias to other 3 Layers Maximum Footprint: 36°C/W Top Layer: .0 square inch Vias to other 3 Layers The SP765X family has been tested with a variety of footprint layouts along with different copper area and thermal resistance has been measured. The layouts were done on 4 layer FR4 PCB with the top and bottom layers using 3oz copper and the power and ground layers using oz copper. For the Minimum footprint, only about 0. square inch (of 3 ounces of) Copper was used on the top or footprint layer, and this layer had no vias to connect to the 3 other layers. For the Medium footprint, about 0.7 square inches (of 3 ounces of) Copper was used on the top layer, but vias were used to connect to the other 3 layers. For the Maximum footprint, about .0 square inch (of 3 ounces of) Copper was used on the top layer and many vias were used to connect to the 3 other layers. The results show that only about 0.7 square inches (of 3 ounces of) Copper on the top layer and vias connecting to the 3 other layers are needed to get the best thermal resistance of 36°C/W. Adding area on the top beyond the 0.7 square inches did not reduce thermal resistance. Using a minimum of 0. square inches of (3 ounces of) Copper on the top layer with no vias connecting to the 3 other layers produced a thermal resistance of 44°C/W. This thermal impedance is only 22% higher than the medium and large footprint layouts, indicating that space constrained designs can still benefit thermally from the Powerblox family of ICs. This indicates that a minimum footprint of 0. square inch, if used on a 4 layer board, can produce 44°C/W thermal resistance. This approach is still very worthwhile if used in a space constrained design. The following page shows the footprint layouts from an ORCAD file. The thermal data was taken for still air, not with forced air. If forced air is used, some improvement in thermal resistance would be seen. Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation  APPLICATIONS INFORMATION Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation 2 TYPICAL PERFORMANCE CHARACTERISTICS Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation 3 TYPICAL PERFORMANCE CHARACTERISTICS Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation 4 PACkAGE: 26 PIN DFN Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation 5 ORDERING INFORMATION Part Number Temperature Package SP7652ER ............................................... -40°C to +85°C .................................. 26 Pin 7 X 4 DFN SP7652ER-L ............................................ -40°C to +85°C ...............(Lead Free) 26 Pin 7 X 4 DFN SP7652ER/TR ......................................... -40°C to +85°C .................................. 26 Pin 7 X 4 DFN SP7652ER-L/TR ...................................... -40°C to +85°C ...............(Lead Free) 26 Pin 7 X 4 DFN Bulk Pack minimum quantity is 500. /TR = Tape and Reel. Pack quantity is 3,000 DFN. Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Rev F: /0/06 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2006 Sipex Corporation 6