SP6137EU-L/TR

S P6137 Wide Input, 900kHz Synchronous PWM Step Down Controller January 2009 Rev. 2.0.0 GENERAL DESCRIPTION APPLICATIONS The SP6137 is a 900kHz constant frequency, voltage mode, synchronous PWM step down controller optimized for high efficiency. • 12V DPA • Communications Systems • Graphics Cards The SP6137 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 SP6137 can accommodate type II and type III compensation schemes. FEATURES • 2.5V to 20V Step Down Achieved Using Dual Input • On-Board 1.5Ω sink (2Ω source) NFET Drivers • Up to 10A Output Capability • UVLO Detects Both VCC and VIN Protection features include a programmable UVLO, thermal shutdown and output short circuit protection. • Short-Circuit Protection with AutoRestart The SP6137 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 SP6132, SP6132H, SP6134, SP6134H and SP6139 for complete details. • Supports Type II or III Compensation • Programmable Soft Start • Fast Transient Response • High Efficiency: Greater than 94% • Non-synchronous Start-Up The SP6137 is available in lead free, RoHS compliant, space saving 10-pin MSOP package. • Small 10-Pin MSOP Package • U.S. Patent #6,922,041 TYPICAL APPLICATION DIAGRAM VIN 2.5V -20V C1 22μF 16V 8 7 6 5 C2 22μF 16V VCC = 5V @ 30mA FDS6676S 14.5A, 6mΩ QT 4 RLF 3.0,5% GND C1, C2 Ceramic 1210 X5R 1 2 3 CBST 0.1μF U1 DBST MBR0530 1 R3 221k, 1% CVCC 10μF 6.3V GND 3 2 3 4 0.8V 5 UVIN R4 100k, 1% CVCC Ceramic 8050 X5R VCC GL BST 10 SP6137 R5 Bead SWN 8 VFB SS 7 COMP UVIN 6 CZ2 RZ2 L1 SC5018-2R7M 2.7μH @ 12A DCR=4.30mΩ GH 9 GND 8 7 6 5 QB 4 SS CSS 47nF C3 47μF 6.3V C4 47μF 6.3V 1 2 3 CZ3 220pF VOUT≤VIN 3.3V @ 10A R1 68.1k, 1% FDS6676S 14.5A, 6.0mΩ GND2 820pF 40.2k, 1% CP1 CF1 100pF RZ3 4.64k, 1% C3, C4 Ceramic 1210 X5R 56pF R2 21.5k, 1% Fig. 1: SP6137 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 P6137 Wide Input, 900kHz 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. 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 P6137 Wide Input, 900kHz Synchronous PWM Step Down Controller TYPICAL APPLICATION DIAGRAM VIN 2.5V -20V C1 22μF 16V 8 7 6 5 C2 22μF 16V VCC = 5V @ 30mA FDS6676S 14.5A, 6mΩ QT 4 RLF 3.0,5% GND C1, C2 Ceramic 1210 X5R 1 2 3 CBST 0.1μF U1 DBST MBR0530 1 R3 221k, 1% CVCC 10μF 6.3V GND 3 2 3 4 0.8V 5 UVIN R4 100k, 1% CVCC Ceramic 8050 X5R VCC GL BST 10 SP6137 SWN 8 VFB SS 7 CZ2 L1 SC5018-2R7M 2.7μH @ 12A QB 4 SS UVIN 6 RZ2 8 7 6 5 DCR=4.30mΩ GH 9 GND COMP R5 Bead CSS 47nF C3 47μF 6.3V C4 47μF 6.3V 1 2 3 CZ3 220pF VOUT≤VIN 3.3V @ 10A R1 68.1k, 1% FDS6676S 14.5A, 6.0mΩ GND2 820pF 40.2k, 1% CP1 CF1 100pF RZ3 4.64k, 1% C3, C4 Ceramic 1210 X5R 56pF R2 21.5k, 1% Note: Components highlighted in bold are those used on the SP6137 Evaluation Board. Table 1. Input and Output Stage Components Selection Charts. © 2008 Exar Corporation 13/15 Rev. 2.0.0 S P6137 Wide Input, 900kHz Synchronous PWM Step Down Controller PACKAGE SPECIFICATION © 2008 Exar Corporation MSOP-10 14/15 Rev. 2.0.0 S P6137 Wide Input, 900kHz Synchronous PWM Step Down Controller REVISION HISTORY – TO BE DELETED PRIOR TO PUBLICATION Revision 2.0.0 Date 1/20/2009 Description Complete re-formatting Changes from PCN #09-0120-01 FOR FURTHER ASSISTANCE Email: customersupport@exar.com Exar Technical Documentation: 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. or its in all Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. © 2008 Exar Corporation 15/15 Rev. 2.0.0