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| L1 Vin C1 ON/OFF GND Vin C1 Vin GND C1 ON/OFF ON/OFF D1 C2 Vout Q1 FETKY GND L1 Vout FETKY Q1 Q1 D1 D1 C2 Vout C2 GND R1 Typical Uses for FETKY(R) Devices (MOSFET + Schottky Co-packaged) Introduction In consumer electronic circuits, Schottky diodes are often seen working with power MOSFETs to implement system level power solutions. There are different reasons for integrating a Schottky diode with a MOSFET. Typical examples of these circuits include reverse protection, asynchronous DC/DC conversion, free-wheeling rectification, switching efficiency improvement, and more. Protection Circuit GND GND FETKY The Schottky diode actually provides a by-pass channel and keeps D1 reverse voltage across the MOSFET to less than a P-N diode drop. Vin Vout C1 GND Vin C1 ON/OFF GND ON/OFF FETKY Q1 D1 C2 R1 GND Vout Examples DC-DC Buck Circuit A MOSFET plus a Schottky diode is the most typical buck converter circuit seen throughout the portable electronics market. The Schottky diode is used as a rectifying element closing the current loop after the main switch turns off. FETKY L1 Vin C1 ON/OFF GND Vin D1 C2 Vout Q1 FETKY D1 C2 R1 GND Protection Circuit Switching Efficiency Improvement Vin Vout Q1 A Schottky diode can be placed in parallel L1 C2 synchronous with the R1 C1 Vin Vout rectifying MOSFET ON/OFF efficiency. It conducts during the deadto improve FETKY time between the on/off cycle of the two power MOSFETs preventing GND the body diode of the bottom MOSFET from turning on andGND storing Q1 charge during the dead-time. This approach can improve efficiency D1 C1 C2 as much as 2%. L1 Vin GND Vout Q1 FETKY DC-DC Buck Circuit FETKY Q1 D1 GND L1 GND Vout C1 C2 Li-Ion Charging Circuit FETKY D1 C1 C2 The FETKY device can be used Q1charging elements for multiple as ON/OFF D1 power sources such as car battery charger, wall charger, or USB Vin Vout connection. A Schottky is preferred over a standard diodeGND because GND of the lower Vf rating resulting in minimum power consumption during ON/OFF Q1 C2 R1 normal C1 operations. GND Vin C1 GND Vin C1 ON/OFF GND Vin ON/OFF GND GND Switching Circuit FETKY D1 Portfolio Please see our lastest portfolio of FETKY devices on the reverse side of this card. For additional information on our FETKY, and other MOSFET portfolio devices, please visit our website at www.onsemi.com. GND Vout C2 R1 GND Q1 FETKY D1 Li-Ion Charging Circuit Q1 FETKY D1 C2 Vout FETKY is a registered trademark of International Rectifier. R1 GND Vout Orderable FETKY Devices from ON Semiconductor mCoolTM Products in WDFN (2 x 2 mm) Device (Max Rating) NTLJF3117P NTLJF4156N NTLJF3118N* *Coming soon. Polarity P-Channel N-Channel N-Channel BVDSS -20 V 30 V 20 V RDS(on) at VGS = 4.5 V 100 mW 70 mW 60 mW Vf If = 1 A 0.47 V 0.47 V 0.365 V Ir Vr = 10 V 1200 mA 1200 mA 1200 mA Pd 1.5 W 1.5 W 1.5 W ChipFETTM Package (3 x 2 mm) Device (Max Rating) NTHD3100F NTHD4P02 NTHD4N02 Polarity P-Channel P-Channel N-Channel BVDSS -20 V -20 V 20 V RDS(on) at VGS = 4.5 V 80 mW 155 mW 80 mW Vf If = 1 A 0.575 V 0.575 V 0.365 V Ir Vr = 10 V 1 mA 1 mA 750 mA Pd 1.1 W 1.1 W 0.91 W SO-8 Dual Package (5 x 6 mm) Device (Max Rating) NTMSD3P303 NTMSD3P102 NTMSD6N303 Polarity P-Channel P-Channel N-Channel BVDSS -30 V -20 V 20 V RDS(on) at VGS = 4.5 V 85 mW 125 mW 40 mW Vf If = 1 A 0.42 V 0.58 V 0.42 V Ir Vr = 10 V 250 mA 500 mA 250 mA Pd 2.0 W 2.0 W 2.0 W mCool is a trademark of Semiconductor Components Industries, LLC. FETKY is a registered trademark of International Rectifier. ChipFET is a trademark of Vishay Siliconix. ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: LiteratureDistributionCenterforONSemiconductor P.O.Box5163,Denver,Colorado80217USA Phone:303-675-2175or800-344-3860TollFreeUSA/Canada Fax:303-675-2176or800-344-3867TollFreeUSA/Canada Email:orderlit@onsemi.com N. American Technical Support:800-282-9855TollFree USA/Canada. Europe, Middle East and Africa Technical Support: Phone:421337902910 Japan Customer Focus Center Phone:81-3-5773-3850 ON Semiconductor Website:www.onsemi.com Order Literature:http://www.onsemi.com/orderlit Foradditionalinformation,pleasecontactyourlocal SalesRepresentative SGD524/D |
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