SP7650

® Advanced SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator 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 mΩ 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 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 SP7650 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 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 step 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 U1 SP7650 1 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 26 25 24 23 22 21 20 19 18 17 16 15 14 L1 2.2uH, Irate=4.78A CZ2 1,000pF RZ2 15k,1% 2 3 4 5 6 RZ3 C3 47uF 6.3V 7.15k,1% VOUT 3.3V 0-3A R1 68.1k,1% CP1 22pF CZ3 150pF CVCC 2.2uF CF1 100pF ENABLE 7 8 9 DBST SD101AWS RSET 21.5k,1% (note 2) CSS 47nF 10 11 12 CBST 6800pF VIN 12V C1 22uF 16V 13 +5V VCC fs=300Khz Notes: 1. U1 Bottom-Side Layout should has three contacts isolated from one another Vin SWNODE and GND 2. RSET=54.48/(Vout-0.8V) (KOhm) GND Date: 08/24/04 SP7650 Wide Input Voltage Range 3A, 300kHz, 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 ............................................................................................................................................... 5A 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 via OTP 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 >> Rz3 Output Load Resistance >> RESR and RDC Date: 08/24/04 SP7650 Wide Input Voltage Range 3A, 300kHz, 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: 08/24/04 SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator © Copyright 2004 Sipex Corporation 10 PACKAGE: 26 PIN DFN D E (7 x 4 mm) Top View e L b E2 D2 D3 D2 Bottom View 26 Pin DFN SYMBOL A A3 A1 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 Side 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: 08/24/04 SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator © Copyright 2004 Sipex Corporation 11 ORDERING INFORMATION Part Number Temperature Package SP7650ER/TR ......................................... -40°C to +85°C ................................. 26 Pin 7 X 4 DFN SP7650ER-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: 08/24/04 SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator © Copyright 2004 Sipex Corporation 12