SP6139EU-L

S P6139 Wide Input, 1.3MHz Synchronous PWM Step Down Controller January 2009 Rev. 2.0.0 GENERAL DESCRIPTION The SP6139 is a 1300kHz constant frequency, voltage mode, synchronous PWM step down controller optimized for high efficiency. The SP6139 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 SP6139 can accommodate type II and type III compensation schemes. Protection features include a programmable UVLO, thermal shutdown and output short circuit protection. The SP6139 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 SP6137 for complete details. The SP6139 is available in lead free, RoHS compliant, space saving 10-pin MSOP package. APPLICATIONS • DSL Modems • Set-Top Boxes • 12V VIN Point of Load Applications FEATURES • 2.5V to 20V Step Down Achieved Using Dual Input • On-Board 1.5Ω sink (2Ω source) NFET Drivers • Up to 7A 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 VIN 12V C1 22μF 16V Si4922DY 8.3A, 18mΩ 1 87 VCC = 5V @ 30mA QT 2 GND C1, C2 Ceramic 1210 X5R RLF 3.0,5% CBST 0.1μF DBST MBR0530 1 VCC GL U1 BST 10 GH 9 DCR=31mΩ L1 SD25-2R2 2.2μH @ 2.8A VOUT≤VIN 3.3V @ 2A R1 68.1k, 1% R5 Bead QB 4 56 R3 150k, 1% UVIN R4 100k, 1% CVCC 10μF 6.3V CVCC Ceramic 8050 X5R GND 3 2 3 4 SP6139 RZ3 2.26k, 1% Si4922DY 8.3A, 18mΩ GND VFB COMP SWN 8 SS 7 UVIN 6 C3 47μF 6.3V C4 47μF 6.3V 0.8V 5 SS CSS 47nF 3 CZ3 220pF CZ2 1.2nF CF1 100pF RZ2 12.7k, 1% CP1 39pF GND2 C3, C4 Ceramic 1210 X5R R2 21.5k, 1% Fig. 1: SP6139 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 P6139 Wide Input, 1.3MHz Synchronous PWM Step Down Controller 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 ...................................................................... 27V BST-SWN ......................................................-0.3 to 7V SWN ............................................................-1V to 20V 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 12/16 Rev. 2.0.0 S P6139 Wide Input, 1.3MHz Synchronous PWM Step Down Controller TYPICAL APPLICATION DIAGRAM VIN 12V C1 22μF 16V Si4922DY 8.3A, 18mΩ 1 87 VCC = 5V @ 30mA QT 2 GND C1, C2 Ceramic 1210 X5R RLF 3.0,5% CBST 0.1μF DBST MBR0530 1 VCC GL L1 SD25-2R2 2.2μH @ 2.8A DCR=31mΩ U1 BST 10 GH 9 R5 Bead QB 4 56 R3 150k, 1% UVIN R4 100k, 1% CVCC 10μF 6.3V CVCC Ceramic 8050 X5R GND 3 2 3 4 SP6139 RZ3 2.26k, 1% Si4922DY 8.3A, 18mΩ VOUT≤VIN 3.3V @ 2A R1 68.1k, 1% GND VFB COMP SWN 8 SS 7 UVIN 6 C3 47μF 6.3V C4 47μF 6.3V 0.8V 5 SS CSS 47nF 3 CZ3 220pF CZ2 1.2nF CF1 100pF RZ2 12.7k, 1% CP1 39pF GND2 C3, C4 Ceramic 1210 X5R R2 21.5k, 1% Note: Components highlighted in bold are those used on the SP6139 Evaluation Board. Table 1. Input and Output Stage Components Selection Charts. © 2008 Exar Corporation 13/16 Rev. 2.0.0 S P6139 Wide Input, 1.3MHz Synchronous PWM Step Down Controller PACKAGE SPECIFICATION MSOP-10 © 2008 Exar Corporation 14/16 Rev. 2.0.0 S P6139 Wide Input, 1.3MHz Synchronous PWM Step Down Controller REVISION HISTORY – TO BE DELETED PRIOR TO PUBLICATION Revision 0.1 1.0 Date Initial Data Sheet Approved and first release of data sheet Converted datasheet to new format ESD rating: 1.5kV BST pin, 2kV all other pins In Electrical Specifications changed Temperature range to -40C to +85C Added VCC supply current Max spec Removed VCC UVLO Stop Threshold Removed UVIN Stop Threshold UVIN Hysteresis changed to 260mV Typ, 390mV Max Removed thermal recovery temp Added driver pull-up and pull-down resistance specs Added operating input voltage range Changed wording regarding type II/III compensation and gm of amp Changed “12” to operating voltage range at start of applications section Updated block diagram Changed Asynchronous to non-synchronous throughout Released Datasheet Description 1.1 Shahin 12/16/2008 1.2 Jon 1/13/2009 2.0 1/15/2009 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 or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in © 2008 Exar Corporation 15/16 Rev. 2.0.0 S P6139 Wide Input, 1.3MHz Synchronous PWM Step Down Controller writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all 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. © 2008 Exar Corporation 16/16 Rev. 2.0.0