L1 Vin Vout C1 D1 Q1 ON/OFF C2 FETKY GND GND L1 Vin Vout FETKY C1 Typical Uses for FETKY® Devices Vin ON/OFF GND C1 ON/OFF Q1 D1 C2 Vout Q1 C2 GND R1 Protection Circuit GND GND FETKY The Schottky diode actually provides a by-pass channel and keeps D1 reverse drop. Vinvoltage across the MOSFET to less than a P-N diodeVout (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. C1 FETKY Q1 ON/OFF C2 D1 GND Vin R1 GND Vout C1 ON/OFF Examples Q1 FETKY C2 R1 D1 GND DC-DC Buck Circuit GND Protection 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 Vout C1 D1 Q1 ON/OFF Vin Q1in parallel L1 A Schottky diode can be placed with C2 the synchronous C1 R1 Vin Vout rectifying MOSFET ON/OFF to improve efficiency. It conducts during the deadtime between the on/off cycle of the twoFETKY 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 D1 improve efficiency C1 C2 as much as 2%. Vin Vout FETKY GND DC-DC Buck Circuit GND L1 Vout Switching Efficiency Improvement L1 C2 FETKY GND Vin D1 Vout GND Q1 D1 C1 C2 Li-Ion Charging Circuit FETKY D1 C1 C2 The FETKY device can be used Q1 as charging elements for multiple ON/OFF D1 powerVinsources such as car battery charger, wall charger,Vout or USB 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. FETKY GND Vin C1 GND D1 Q1 FETKY ON/OFF D1 Vout C2 GND Vin GND GND Switching Circuit 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. R1 GND Li-Ion Charging Circuit Q1 FETKY C1 ON/OFF Vout FETKY is a registered trademark of International Rectifier. C2 R1 D1 GND GND Vin Vout Orderable FETKY Devices from ON Semiconductor mCool™ Products in WDFN (2 x 2 mm) Device (Max Rating) Polarity BVDSS RDS(on) at VGS = 4.5 V Vf If = 1 A Ir Vr = 10 V Pd NTLJF3117P P-Channel -20 V 100 mW 0.47 V 1200 mA 1.5 W NTLJF4156N N-Channel 30 V 70 mW 0.47 V 1200 mA 1.5 W NTLJF3118N* N-Channel 20 V 60 mW 0.365 V 1200 mA 1.5 W Polarity BVDSS RDS(on) at VGS = 4.5 V Vf If = 1 A Ir Vr = 10 V Pd NTHD3100F P-Channel -20 V 80 mW 0.575 V 1 mA 1.1 W NTHD4P02 P-Channel -20 V 155 mW 0.575 V 1 mA 1.1 W NTHD4N02 N-Channel 20 V 80 mW 0.365 V 750 mA 0.91 W Polarity BVDSS RDS(on) at VGS = 4.5 V Vf If = 1 A Ir Vr = 10 V Pd NTMSD3P303 P-Channel -30 V 85 mW 0.42 V 250 mA 2.0 W NTMSD3P102 P-Channel -20 V 125 mW 0.58 V 500 mA 2.0 W NTMSD6N303 N-Channel 20 V 40 mW 0.42 V 250 mA 2.0 W *Coming soon. ChipFET™ Package (3 x 2 mm) Device (Max Rating) SO-8 Dual Package (5 x 6 mm) Device (Max Rating) 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. 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