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Si4728CY
Vishay Siliconix
N-Channel Synchronous MOSFETs with Break-Before-Make
FEATURES
D D D D 4...
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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
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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...