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SI4728CY Arkusz danych(PDF) 1 Page - Vishay Siliconix |
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SI4728CY Arkusz danych(HTML) 1 Page - Vishay Siliconix |
1 / 9 page Si4728CY Vishay Siliconix Document Number: 71286 S-03075—Rev. C, 03-Feb-03 www.vishay.com 1 N-Channel Synchronous MOSFETs with Break-Before-Make FEATURES D 4.5- to 30-V Operation D Driver Impedance—3 W D Undervoltage Lockout D Fast Switching Times (30 ns typ.) D 30-V MOSFETs D High Side: 0.018 W @ VDD = 4.5 V D Low Side: 0.0105 W @ VDD = 4.5 V D Switching Frequency: 250 kHz to 1 MHz DESCRIPTION The Si4728CY n-channel synchronous MOSFET with break-before-make (BBM) is a high speed driver designed to operate in high frequency dc-dc switchmode power supplies. It’s purpose is to simplify the use of n-channel MOSFETs in high frequency buck regulators. This device is design to be used with any single output PWM IC or ASIC to produce a highly efficient low cost synchronous rectifier converter. A synchronous enable pin (disable = low, enable = high) controls the synchronous function for light load conditions. The Si4728CY is packaged in Vishay Siliconix’s high performance LITTLE FOOT R SO-16 package. FUNCTIONAL BLOCK DIAGRAM MOSFET Drive Circuitry with Break-Before- Make Si4728 CBOOT CBOOT D1 S1 D2 S2 VDD SYNC EN IN GND + VOUT GND DC-DC Controller 4.5 V to 30 V 5 V GND Q1 Q2 |
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