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Low-Z driver ICs boost multiphase, motor designs

Posted: 04 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:mosfet? mosfet driver ic? driver ic? siliconix? sip41103?

Four new high-speed, low-impedance n-channel MOSFET driver ICs from Siliconix Inc. are intended to improve high-current, single- and multiphase dc-dc switching power supply designs. One of the new drivers is specifically suited to brushless motor control applications.

The SiP41103, sip41104 and sip41105 dual-MOSFET devices, which drive both the lower and upper MOSFETs in a half-bridge configuration, work in systems powered by 4.5V to 50V sources and deliver up to 1A. These drivers operate at 240kHz to 1MHz and have an impedance of less than 1 ohm, according to Siliconix, allowing for reduced capacitor and inductor size. The fourth MOSFET driver, the sip42101, is equipped with a brake function for motor drive (50kHz) applications. It joins the company's existing family of motor drivers, including the Si9986, which has integrated 1A MOSFETs.

The new family's break-before-make logic prevents shoot-through currents in external MOSFETs as well as the internal bootstrap diode. A shutdown/control pin is used to enable the drivers, and a synchronous enable pin is 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 under-voltage lockout feature prevents driving of the MOSFET gates when the supply voltage is less than specified, thereby ensuring that output MOSFETs are turned on only when there's sufficient gate voltage. The devices have a shutdown quiescent current of less than 5?A.

All four new MOSFET drivers are available in both standard and Pb-free packages. The SiP42101 and SiP41103 come in a MLP33-10 package, while the SiP41104 is in an SO-8 package and the SiP41105 in a TSSOP-16 PowerPAK. These products are rated for operation over the -40C to 85C temperature range.

Samples and production quantities of the SiP42101, SiP41103, SiP41104 and SiP41105 are already available, with lead times of 8 to 10 weeks for larger orders. Pricing for U.S. delivery in 1,000-piece quantities is $1.96 each for the SiP41101 and $1.83 each for the SiP41103, SiP41104, SiP41105 and SiP42101.

- Vincent Biancomano


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