Power Electronics

N-Channel MOSFET Drivers Feature 1-A Drive Capability

Siliconix Inc. has announced four high-speed, half-bridge n-channel MOSFET driver ICs designed for use in high-frequency, high-current, single- and multiphase dc-dc switching power supplies. These chips include one driver with a brake for brushless motor control applications.

The new SiP41103, SiP41104 and SiP41105 dual MOSFET drivers, which drive both the lower and upper MOSFETs in a half-bridge configuration, work in systems with supply voltages from 4.5 V up to 50 V. Designed to supply output currents up to 1 A, these three drivers operate at switching frequencies of 250 kHz to 1 MHz with a driver impedance of less than 1 Ω, allowing for reduced capacitor and inductor size. The new SiP42101, which is equipped with a brake function for motor drive applications, operates at 50 kHz.

The family's break-before-make logic prevents shoot-through currents in the external MOSFETs as well as the internal bootstrap diode, which drives an n-channel high-side MOSFET that reduces the number of external components. A shutdown/control pin is used to enable the drivers, and a synchronous enable pin is additionally provided on the SiP41103 and SiP41105 to allow disabling of the low-side or "synchronous rectifier" MOSFET to maximize efficiency at light power loads.

All four new MOSFET drivers are available in both standard and lead (Pb)-free packages. The SiP42101 and SiP41103 have an MLP33-10 package, while the SiP41104 has an SO-8 package and the SiP41105 a TSSOP-16 PowerPAK. Samples and production quantities of the SiP42101, SiP41103, SiP41104 and SiP41105 are available now. Pricing for U.S. delivery in 1000-piece quantities is $1.96 for the SiP41101 and $1.83 for the SiP41103, SiP41104, SiP41105 and SiP42101.

For more information, visit www.vishay.com.

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