SI4728CY

www.DataSheet4U.com Si4728CY Vishay Siliconix N-Channel Synchronous MOSFETs with Break-Before-Make FEATURES D D D D 4.5- to 30-V Operation Driver Impedance—3 W Undervoltage Lockout Fast Switching Times (30 ns typ.) D D D D 30-V MOSFETs High Side: 0.018 W @ VDD = 4.5 V Low Side: 0.0105 W @ VDD = 4.5 V 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 FOOTR SO-16 package. FUNCTIONAL BLOCK DIAGRAM 4.5 V to 30 V 5V VDD Si4728 CBOOT D1 Q1 MOSFET Drive Circuitry with Break-BeforeMake S1 D2 CBOOT VOUT + SYNC EN DC-DC Controller IN GND Q2 S2 GND GND Document Number: 71286 S-03075—Rev. C, 03-Feb-03 www.vishay.com 1 www.DataSheet4U.com Si4728CY Vishay Siliconix ABSOLUTE MAXIMUM RATINGS (TA = 25_C UNLESS OTHERWISE NOTED) Parameter Logic Supply Logic Inputs Drain-Source Voltage Bootstrap Voltage Synchronous Pin Voltage Maximum Power Dissipationa Driver Operating Junction and Storage Tempera...