New Product Bulletin Compact Non-Isolated 3-Pin DC/DC Converters Energy Saving BP5275 Series (BP5275-50, BP5275-33, BP5275-25, BP5275-18) Step-down synchronous rectification switching regulators enable high efficiency DC/DC operation using no external parts No Input/ Output Capacitor Easy DC/DC Operation EnergySaving Pin-compatible with 3-pin LDOs Product Outline The compact, high performance BP5275 series utilizes synchronous rectification for high efficiency, high frequency operation. All components required for DC/DC conversion are built in, simplifying layout along with circuit/thermal design. Compact package (TO-220) and no external parts required Dimensions (Unit: mm) 13.6 5.4 5.2 BP5275-50 947 * All necessary components are integrated into the TO-220 package. And no input or output capacitors are required. The result is a mounting area 6 times smaller than conventional solutions. In addition, the units are pin-compatible with the 3-terminal LDOs, making replacement easy. Original high heat dissipation configuration Heat generated by the chip is dissipated through the attached aluminum heat sink, eliminating the need for thermal countermeasures. In addition, an external heat sink can be attached, making it possible to increase the output current. Cross-Sectional Diagram Magnified Aluminum Heat Sink Board Chip H E A T 2.95 2.0 0.25 Heat is dissipated through the aluminum heat sink Internal Circuit Diagram All-in-One No external input capacitor Control Circuit No external output capacitor Heat dissipation is required, even for surface mount DC/DC converter ICs. The BP5275 series was specially designed for optimum heat dissipation in a compact form factor, minimizing mounting area. Size Comparison BP5275 Surface Mount IC 1/6th the size 20.0mm Input/output capacitors are included 31.5mm Synchronous rectification results in 93% efficiency Minimum required mounting area (2.5W output, 2-layer board) 100% BP5275 90% Conventional Product 80% 70% 60% 0 100 200 300 400 Load Current Io [mA] 500 Conversion efficiency is significantly increased over conventional products, making it easy to lower set power consumption. In addition, the output voltage is accurate to within ±2%. Access Our Website 6.0mm Absolute Maximum Ratings No. Parameter Symbol Rating Unit 1 Input Voltage Vin 15 V 2 Operating Temp. Topr -20 to 80 ˚C 3 Storage Temp. Tstg -40 to 85 ˚C 4 Surface Temp. Tcmax 105 ˚C 5 Output Current Iomax 500 mA Remarks *1: 800mA possible with heat sink Lineup available in different output voltages : 1.8V/2.5V/3.3V/5.0V The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request.Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage.The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information.If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. www. rohm. com 13.6mm Catalog No.52F6252E 12. 2009 ROHM © 21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585 Japan TEL : +81-75-311-2121 FAX : +81-75-315-0172 www.rohm.com