SP6134

S P613 4 600kHz Synchronous PWM Step Down Controller January 2009 Rev. 2.0.0 GENERAL DESCRIPTION The SP6134 is a 600kHz constant frequency, voltage mode, synchronous PWM step down controller optimized for high efficiency. The SP6134 is adequately suited for split plane applications utilizing a low power 5V rail to power the controller circuitry, minimizing power dissipation. Its wide input voltage range of 3V to 15V allows for conversions from the standard 3.3V, 5V, 9.6V and 12V power rails to an output voltage adjustable down to 0.8V. Developed around a wide bandwidth internal amplifier, the SP6134 can accommodate type II and type III compensation schemes. Protection features include a programmable UVLO, thermal shutdown and output short circuit protection. The SP6134 is part of a larger family of step down controllers operating at various switching frequencies up to 1300kHz and input voltages up to 28V. Refer to Exar’s SP6134H, SP6132, SP6132H, SP6137 and SP6139 for complete details. The SP6134 is available in lead free, RoHS compliant, space saving 10-pin MSOP package. APPLICATIONS • 12V DPA • Communications Systems • Graphics Cards FEATURES • 3V to 15V Step Down Achieved Using Dual Input • On-Board 1.5Ω sink (2Ω source) NFET Drivers • Up to 15A Output Capability • UVLO Detects Both VCC and VIN • Short-Circuit Protection with AutoRestart • Supports Type II or III Compensation • Programmable Soft Start • Fast Transient Response • High Efficiency: Greater than 94% • Non-synchronous Start-Up • Small 10-Pin MSOP Package • U.S. Patent #6,922,041 TYPICAL APPLICATION DIAGRAM Fig. 1: SP6134 Application Diagram Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 – Fax. +1 510 668-7001 S P613 4 600kHz Synchronous PWM Step Down Controller 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 BST ...................................................................... 22V BST-SWN ......................................................-0.3 to 7V SWN ............................................................-1V to 15V GH................................................... -0.3V to BST+0.3V GH-SWN.................................................................. 7V All other pins ..................................... -0.3V to VCC+0.3V GH, GL peak output current > Cp1 and R1 >> Rz3 Output Load Resistance >> Resr and Rdc Bode Plot of Type III Error Amplifier Compensation. © 2008 Exar Corporation 12/15 Rev. 2.0.0 S P613 4 600kHz Synchronous PWM Step Down Controller TYPICAL APPLICATION DIAGRAM Note: Components highlighted in bold are those used on the SP6134 Evaluation Board. Table 1. Input and Output Stage Components Selection Charts. © 2008 Exar Corporation 13/15 Rev. 2.0.0 S P613 4 600kHz Synchronous PWM Step Down Controller PACKAGE SPECIFICATION MSOP-10 © 2008 Exar Corporation 14/15 Rev. 2.0.0 S P613 4 600kHz Synchronous PWM Step Down Controller REVISION HISTORY – TO BE DELETED PRIOR TO PUBLICATION Revision 2.0.0 Date 1/20/2009 Complete re-formatting Changes from PCN #09-0120-01 Description FOR FURTHER ASSISTANCE Email: Exar Technical Documentation: customersupport@exar.com http://www.exar.com/TechDoc/default.aspx? EXAR CORPORATION HEADQUARTERS AND SALES OFFICES 48720 Kato Road Fremont, CA 94538 – USA Tel.: +1 (510) 668-7000 Fax: +1 (510) 668-7030 www.exar.com NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. or its in all © 2008 Exar Corporation 15/15 Rev. 2.0.0