New Vishay Siliconix Synchronous Buck Step-Down Controller ICs Handle 10-A Currents, Provide Industry-Low Outputs to 0.6 V With 93% Efficiency.MALVERN, Pa. -- Vishay Intertechnology Inc. (NYSE NYSE See: New York Stock Exchange : VSH VSH Vegetarian Society of Houston (USA) VSH Vertical Split Head (railway defect) VSH Video Sensor Head VSH Virus Shield VSH Virtual Software House VSH Virtual Switch Header ) today 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 devices' 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 cooling systems for housed animals include spraying of roofs with water, evaporative pads with fans, foggers and misters; for pastured animals shelter from the sun by trees or artificial shade devices and cooling ponds are used. . The 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 controls, wireless and cable modems cable modem Modem used to convert analog data signals to digital form and vise versa, for transmission or receipt over cable television lines, especially for connecting to the Internet. , set-top boxes The cable TV box that sits on "top" of the TV "set," although it is often located several feet away in an equipment rack. The set-top box descrambles the premium channels and provides a tuner for the higher cable numbers that very old TVs did not support. , LCD TVs A flat panel TV that uses LCD technology or a rear-projection TV that is based on LCD microdisplay panels. See flat panel TV, rear-projection TV and LCD. , telecom power supplies and servers, point-of-load (POL) 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 Synchronous converter A synchronous machine used to convert alternating current (ac) to direct current (dc), or vice versa. The ac-to-dc converter has been superseded by the mercury arc rectifier (for reasons of efficiency, lower maintenance costs, and less , 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 (1) On magnetic media, a bit that has lost its strength due to a surface defect or recording malfunction. If the bit is in an audio or video file, it might be detected by the error correction circuitry and either corrected or not, but if not, it is often not noticed by the human (LDO LDO Low-Dropout (Used With Regulators) LDO Limited Duty Officer LDO Light Diesel Oil (petroleum) LDO Local Development Officer (Nepal) LDO Land Development Ordinance ) regulator by going to 100% duty cycle. The SiP12202 drives an n-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor) The most popular and widely used type of field effect transistor (see FET). MOSFETs are either NMOS (n-channel) or PMOS (p-channel) transistors, which are fabricated as individually packaged 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 A charge pump is an electronic circuit that uses capacitors as energy storage elements to create either a higher or lower voltage power source. Charge pump circuits are capable of high efficiencies, sometimes as high as 90-95% while being electrically simple circuits. 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. New SiP12201 and SiP12202 Step-Down Controller ICs: Summary Table
Input Adjustable Converter Frequency
Device Voltage Output Load Max. External MOSFETs
(V) (V) Max. (A) (kHz)
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Drives n-channel
SiP12201 4.2 to 26 0.6 to 20 10 500 MOSFETs for high-
side and low-side
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Drives p-channel
SiP12202 2.7 to 5.5 0.6 to 5.0 10 500 MOSFETs high-side
and n-channel
MOSFETs low-side
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Links to product datasheets: http://www.vishay.com/doc?73541 (SiP12201) http://www.vishay.com/doc?73542 (SiP12202) Because Vishay provides compatible controller and MOSFET devices, designers have access to the best complete solutions for high- and low-voltage step-down applications. The SiP12201 is optimized for use with Vishay's Si7114DN n-channel power MOSFETs A Power MOSFET is a specific type of Metal Oxide Semiconductor Field-Effect Transistor (MOSFET) designed to handle large powers. Compared to the other power semiconductor devices (IGBT, Thyristor... , while the SiP12202 is optimized for use with the Si7106DN p-channel and Si7110DN n-channel power MOSFETs. Both of the new step-down controllers include a combination compensation/shutdown pin, as well as additional protection features such as undervoltage lockout lockout, intentional closing up of a company, factory, or shop by an employer to prevent employees from working during a strike or labor dispute. The term lockout , power good output, output-current limit, and thermal shutdown. Internal soft start prevents voltage spikes during startup. Each controller is available in a lead (Pb)-free MLP (Meridian Lossless Packing) The compression technique used in DVD-Audio that provides the highest audio quality. It delivers two channels at 192 kHz with 24-bit samples or six channels at 96 kHz. 33-10 package and is specified to operate over a temperature range of -40 degrees C to +85 degrees C. Samples and production quantities of the new synchronous buck step-down controller ICs are available now, with lead times of six to seven weeks for larger orders. Vishay Intertechnology Inc., a Fortune 1000 company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, transistors, and optoelectronics) and selected ICs, and passive electronic components (resistors, capacitors, inductors, and transducers). Vishay's components can be found in products manufactured in a very broad range of industries worldwide. Vishay is headquartered in Malvern, Pa., and has operations in 17 countries employing more than 25,000 people. Vishay can be found on the Internet at http://www.vishay.com. |
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