SSPP66666699EEBB 660000mmAA 11..55MMHHzz SSyynncchhrroonnoouuss SStteepp--DDoowwnn CCoonnvveerrtteerr February 2012 Rev. 1.0.0 GENERAL DESCRIPTION EEVVAALLUUAATTIIOONN BBOOAARRDD MMAANNUUAALL The SP6669 is a synchronous current mode PWM step down (buck) converter capable of delivering up to 600mA of current and optimized for portable battery-operated applications. Based on a current-mode 1.5MHz constant frequency PWM control scheme, the SP6669 reduces the overall component count and solution footprint. It provides low output voltage ripple and excellent line and load regulation. It also implements a 100% duty cycle LDO mode. Output voltage is adjustable FEATURES to as low as 0.6V with a better than 3% accuracy while a low quiescent current  Guaranteed 600mA Output Current supports the most stringent battery operating  Input Voltage: 2.5V to 5.5V conditions.  1.5MHz PWM Current Mode Control Built-in over temperature and under voltage lock-out protections insure safe operations  100% Duty Cycle LDO Mode Operations under abnormal operating conditions.  Achieves 95% Efficiency The SP6669 is offered in a RoHS compliant,  Adjustable Output Voltage Range “green”/halogen free 5-pin SOT23 package.  As Low as 0.6V with ±3% Accuracy  Over Temperature & UVLO Protection EVALUATION BOARD SCHEMATICS Fig. 1: SP6669 Evaluation Board Schematics Exar Corporation www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 – Fax. +1 510 668-7001

SSPP66666699EEBB 660000mmAA 11..55MMHHzz SSyynncchhrroonnoouuss SStteepp--DDoowwnn CCoonnvveerrtteerr PIN ASSIGNMENT Fig. 2: SP6669 Pin Assignment PIN DESCRIPTION Name Pin Number Description Enable Pin. Do not leave the pin floating. EN 1 V <0.4V: Shutdown mode EN V >1.2V: Device enabled EN GND 2 Ground Signal Pin. SW 3 Switching node. Power Supply Pin. VIN 4 Must be decoupled to ground with a 4.7µF or greater ceramic capacitor. Adjustable Version Feedback Input Pin. VFB 5 Connect VFB to the center point of the resistor divider. ORDERING INFORMATION Refer to SP6669’s datasheet and/or www.exar.com for exact and up to date ordering information. © 2012 Exar Corporation 2/6 Rev. 1.0.0

SSPP66666699EEBB 660000mmAA 11..55MMHHzz SSyynncchhrroonnoouuss SStteepp--DDoowwnn CCoonnvveerrtteerr USING THE EVALUATION BOARD JUMPER J1 FUNCTION Jumper J1 can be used to either short EN pin INITIAL SETUP to VIN or to GND. The Board is supplied from Set the input supply to a voltage between EXAR with the jumper set to connect EN to 2.5V to 5.5V and connect it to VIN and GND VIN. connectors on the left side of the evaluation board. Connect the load to the VOUT and GND V PROGRAMMING OUT connectors on the right hand side of the The SP6669 has a dynamically programmable board. Check to make sure that jumper J1 is output voltage using 2 feedback resistors to set to VIN. The board will power-up and control the output voltage: regulate to the desired output voltage VOUT set by the feedback resistors. The board will operate with a load current I of up to OUT 600mA. © 2012 Exar Corporation 3/6 Rev. 1.0.0

SSPP66666699EEBB 660000mmAA 11..55MMHHzz SSyynncchhrroonnoouuss SStteepp--DDoowwnn CCoonnvveerrtteerr EVALUATION BOARD SCHEMATICS © 2012 Exar Corporation 4/6 Rev. 1.0.0

SSPP66666699EEBB 660000mmAA 11..55MMHHzz SSyynncchhrroonnoouuss SStteepp--DDoowwnn CCoonnvveerrtteerr BILL OF MATERIAL Ref. Qty Manufacturer Part Number Size Component Board 1 Exar Corp. 146-6595-00 1"x1.5" SP6669 Eval board U1 1 Exar Corp. SP6669AEK-L SOT23-5L 600mA Buck Reg. CIN 1 Murata GRM188R60J475KE19D 0603 Ceramic 4.7µF 6.3V X5R COUT 1 Murata GRM21BR60J106KE19 0805 Ceramic 10µF 6.3V X5R CF 1 Murata GRM1885C1H101JA01B 0603 Ceramic 100pF 50V COG 2.8mm x 2.8mm x L1 1 Wurth Electronik 744025004 Inductor 4.7µH, 1.35A, 100mΩ 2.8mm R1 1 Vishay CRCW06032003F 0603 0603 200KΩ, 1/10W, 1% R2 1 Vishay CRCW06031003F 0603 100KΩ, 1/10W, 1% J1 1 Wurth Electronik 61303611121 0.64mm SQ x 6mm 3 Pin Header, 2.54mm pitch J1 (Jumper) 1 Wurth Electronik 609002115121 0.1” Jumper short TP 3 Mill-Max 0300-115-01-4727100 0.042” dia Test Point Female Pin © 2012 Exar Corporation 5/6 Rev. 1.0.0

SSPP66666699EEBB 660000mmAA 11..55MMHHzz SSyynncchhrroonnoouuss SStteepp--DDoowwnn CCoonnvveerrtteerr REVISION HISTORY Revision Date Description 1.0.0 09/16/2010 Initial release of document 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 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 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. © 2012 Exar Corporation 6/6 Rev. 1.0.0

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