SP7652

® Preliminary SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 2.5V to 28V Step Down Achieved Using Dual Input Output Voltage down to 0.8V 6A Output Capability (Up to 8A with Air Flow) Built in Low RDSON Power FETs (15 mΩ typ) Highly Integrated Design, Minimal Components 600 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 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 to VIN Heatsink pad 2 Connect to GND TOP VIEW Heatsink Pad 1 Connect to Lx SP7652 DFN PACKAGE 7mm x 4mm 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 Now Available in Lead Free Packaging DESCRIPTION The SP7652 is a synchronous step-down switching regulator 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 SP7652 is designed to provide a fully integrated buck regulator solution using a fixed 600kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The SP7652 is available in the space saving DFN package. TYPICAL APPLICATION CIRCUIT 100pF 5.1K 21.5k,1% U1 1nF 12K 1 2 3 PGND PGND PGND GND VFB COMP UVIN GND SS VIN VIN VIN VIN RSET (note 2) 68.1k,1% 26 25 24 23 22 21 20 19 18 17 16 15 14 SP7652 LX LX LX LX VCC GND GND GND BST NC LX LX LX VOUT 3.3V 0-8A 47uF Ceramic X5R 6.3V 1.5uH, Irate=8A 22pF 4 5 6 7 5V VCC CVCC 1uF CF1 100pF 8 9 ENABLE VIN 10 CSS 22nF 5.1 SD101AWS 11 12 13 1uF 2.5V - 20V Notes: C1 22uF 1. U1 Bottom-Side Layout should has three contacts isolated from one another VIN and SWNODE and GND 2. RSET = 54.48 / (Vout - 0.8V) (kOhm) GND Date: 08/12/04 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2004 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS 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. VCC .................................................................................................. 7V VIN ........................................................................................................................................... 30V ILX ............................................................................................................................................ 10A BST ............................................................................................... 35V BST-SWN ......................................................................... -0.3V to 7V SWN ................................................................................... -1V to 30V GH ......................................................................... -0.3V to BST+0.3V GH-SWN ......................................................................................... 7V All other pins .......................................................... -0.3V to VCC+0.3V Storage Temperature .................................................. -65°C to 150°C Power Dissipation .................................................... Internally Limited Lead Temperature (Soldering, 10 sec) ...................................... 300°C ESD Rating .......................................................................... 2kV HBM Thermal Resistance ϑJC .................................................................................... 5°C/W ELECTRICAL SPECIFICATIONS Unless otherwise specified: -40°C < TAMB < 85°C, -40°C> Cp1 and R1 >> RZ 3 Output Load Resistance >> RESR and RDC Date: 08/12/04 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2004 Sipex Corporation 9 APPLICATIONS INFORMATION Gain (dB) Error Amplifier Gain Bandwidth Product Condition: C22 >> CP1, R1 >> RZ3 20 Log (RZ2/R1) 1/6.28 (RZ2) (CP1) 1/6.28 (RZ3) (CZ3) 1/6.28 (R1) (CZ3) 1/6.28(R22) (CZ2) 1/6.28 (R1) (CZ2) Frequency (Hz) Bode Plot of Type III Error Amplifier Compensation. CP1 RZ3 VOUT R1 68.1k, 1% CZ3 CZ2 RZ2 R SET 5 VFB + + - 0.8V 6 COMP CF1 R SET =54.48/ (VOUT -0.8) (kΩ) Type III Error Amplifier Compensation Circuit Date: 08/12/04 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2004 Sipex Corporation 10 TYPICAL PERFORMANCE CHARACTERISTICS 96.0 94.0 Efficiency (%) SP7652 Effi. vs Iout Plots @ Vin=8V, 12V, 15V, and Vout=5.0V 4.96 Output Voltage (V) SP7652 Vout vs Iout Plots @ Vin=8V, 12V, and 15V 92.0 90.0 88.0 86.0 84.0 82.0 80.0 1 2 3 4 5 6 Load Current (A) Vin=12V Vin=8V Vin=15V 4.955 4.95 4.945 4.94 0 Vin=12V Vin=8V Vin=15V 1 2 3 Load Current (A) 4 5 6 93.5 93.0 SP7652 Effi. vs Iout Plots @ Vin=5V, and Vout=3.3V 3.31 3.305 Output Voltage (V) SP7652 Vout vs Iout Plots @ Vin=5V, and Vout=3.3V Efficiency (%) 92.5 92.0 91.5 91.0 90.5 90.0 1 2 3 4 5 6 Load Current (A) 3.3 3.295 3.29 3.285 3.28 0 1 2 3 4 5 6 Load Current (A) SP7652 Effi. vs Iout Plots @ Vin=3.3V, and Vout=0.8V 80.0 79.0 77.0 76.0 75.0 74.0 73.0 72.0 71.0 70.0 1 2 3 4 5 6 SP7652 Vout vs Iout Plots @ Vin=3.3V, and Vout=0.8V 0.794 Output Voltage (V) 78.0 Efficiency (%) 0.792 0.79 0.788 0.786 0 1 2 3 4 5 6 Load Current (A) Load Current (A) Date: 08/12/04 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2004 Sipex Corporation 11 PACKAGE: 26 PIN DFN D E (7 x 4 mm) Top View A A3 A1 Side View b e L E2 D2 D3 D2 26 Pin DFN SYMBOL DIMENSIONS in (mm) MIN NOM MAX 0.800 0.850 0.900 0.000 - 0.050 0.178 0.203 0.228 0.17 0.22 0.27 6.95 2.00 0.45 3.95 7.00 2.05 0.50 4.00 7.05 2.10 Bottom View A A1 A3 b D D2 D3 e E E2 L 1.78 1.83 1.88 0.55 4.05 2.730 2.780 2.830 0.350 0.400 0.450 26 Pin DFN Date: 08/12/04 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2004 Sipex Corporation 12 ORDERING INFORMATION Part Number Temperature Package 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 /TR = Tape and Reel Pack quantity is 3000 DFN. Corporation ANALOG EXCELLENCE 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. Date: 08/12/04 SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator © Copyright 2004 Sipex Corporation 13