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New Vishay Siliconix synchronous buck step-down controller

Vishay Electronic : 08 April, 2007  (New Product)
Vishay Intertechnology, Inc. released two new synchronous buck step-down controller ICs designed to operate with external MOSFETs, and a minimum of external components, in dc to dc converter circuits that require output currents upwards of 10 A.
The high-voltage SiP12201 and low-voltage SiP12202 controllers both are designed to enable flexible, efficient voltage conversion in a broad range of applications in battery-powered, telecom, and industrial end systems. The new devicesí synchronous buck architecture allows voltages to be converted with efficiencies of 93%, prolonging battery life while lowering heat in enclosed field-mounted or rack-mounted systems and reducing the need for cooling systems.

Input voltage range is 4.2 V to 26 V for the SiP12201 and 2.7 to 5.5 V for the SiP12202. Adjustable output voltages for the two devices range from 0.6 V to 20 V for the SiP12201 and from 0.6 V to 5.5 V for the SiP12202. The ability to reach 0.6 V at the low end is a unique capability for a device with a 500-kHz operating frequency and ensures the SiP12201 and SiP12202 will be able to satisfy the future requirements of lower voltages, predicted to decrease to 0.6 V during the next decade.

SiP12201 High-Voltage Step-Down Controller

The high-voltage SiP12201 synchronous buck step-down controller is designed for industrial control; wireless and cable modems; set-top boxes; LCD TVs; telecom power supplies and servers; point of load modules; and for delivering regulated power to microprocessors, ASICs, FPGAs, and DSPs in a wide variety of end products. Able to drive n-channel MOSFETs for both the high-side and low-side in a synchronous converter, the SiP12201 helps to reduce overall design costs by allowing the use of two lower-cost n-channel devices instead of one n-channel and one p-channel device. The SiP12201 also offers the advantage of 500 kHz operation, which allows the use of smaller passive components in converter designs.

SiP12202 Low-Voltage Step-Down Controller

The low-voltage SiP12202 synchronous buck step-down controller is intended for power conversion in battery-powered electronics, as well as in notebook and desktop computers and a wide range of other systems using point-of-load or distributed power converters. The controller can be set to 100% duty cycle to assure continued efficiency during low input-voltage conditions. In the event of a low-battery condition, the chip is able to operate as a low dropout regulator by going to 100% duty cycle.

The SiP12202 drives an n-channel MOSFET on the low side and a p-channel MOSFET on the high side. Use of the p-channel MOSFET on the high side eliminates the need for an external charge pump while also simplifying the high-side gate driver. High-frequency operation up to 500 kHz enables use of smaller passive components for more compact end systems.
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