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Siliconix unveils four new MOSFET driver ICs

Posted: 02 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:siliconix? vishay intertechnology? mosfet driver ic? sip41103? sip41104?

Siliconix Inc., a subsidiary of Vishay Intertechnology Inc., announced four new high-speed, half-bridge, n-channel MOSFET driver ICs.

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 4.5V up to 50V. Designed to supply output currents up to 1A, these three drivers device at switching frequencies of 250kHz to 1MHz with a driver impedance of less than 1?, allowing for reduced capacitor and inductor size. The fourth productthe sip42101, is equipped with a brake function for motor drive applications and operates at 50kHz.

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.

An undervoltage lockout feature prevents driving of the MOSFET gates when the supply voltage (at VDD) is less than is specified, ensuring that output MOSFETs are only turned on when sufficient gate voltage is present. The devices have a shutdown quiescent current of less than 5?A.

Designed for use in high-frequency, high-current, single- and multiphase dc-to-dc switching power supplies, including one driver with a brake for brushless motor control applications, the four MOSFET drivers are available in both standard and Pb-free packages. The SiP42101 and SiP41103 have an MLP33-10 package, while the SiP41104 has an SO-8 package and the SiP41105 an TSSOP-16 PowerPAK. Operating temperature range is from -40C to 85C.

Samples and production quantities of the ICs are available, with lead times of 8 to 10 weeks for larger orders.




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