Semtech Smart LDO Dual Linear FET Controller Improves Design of Dual Output Power Supplies in Notebooks, Desktops, and Other Applications.Business Editors/High-Tech Writers CAMARILLO, Calif.--(BUSINESS WIRE)--Dec. 16, 2002 Space- and Cost-Saving Device is Optimized for Low Voltage Low voltage is an electrical engineering term that broadly identifies safety considerations of an electricity supply system based on the voltage used. While different definitions exist for the exact voltage range covered by "low voltage", the most commonly used ones include "mains Input-to-Output Differential Supplies Semtech Corp. (Nasdaq:SMTC SMTC Southern Maine Technical College SMTC Science/Mathematics/Technology Center (Central Michigan University) SMTC Saluda Mountain Telephone Company (Knoxville, Tennessee) SMTC Short-To-Medium Term Control ), a leading supplier of analog and mixed-signal semiconductors for communications, portable devices, computers, and industrial equipment, today announced a power controller that allows designers to implement simpler and more compact distributed dual power supplies. The SC338 Dual Linear FET FET: see transistor. (Field Effect Transistor) One of two major categories of transistor; the other is bipolar. FETs use a gate element that, when charged, creates an electromagnetic field that changes the conductivity of a silicon Controller provides two regulated output voltages to support power supply requirements in the latest notebook and desktop computers, PC expansion cards, embedded Inserted into. See embedded system. computers, set top boxes, network hubs, routers, and other communications systems. Since the desired 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 voltage performance and output currents for target applications are set using external MOSFETs, maximum flexibility is afforded to designers. The SC338 dual linear FET controller is designed for input supplies ranging from 4.5V to 13.2V, with two independent and fully adjustable outputs, depending on input supply. For instance, with a 12V input the output range is 0.5V to 3.3V, while a 5V input yields output voltage range of 0.5V to 1.8V. The SC338 provides two output accuracy options, +/-1.5% or +/-2.5% reference voltage. The device also exhibits very low quiescent quiescent at rest; latent; the G0 stage of the cell cycle. current in shutdown mode, typically 500 to 600uA depending on input voltage. The SC338 provides superior voltage regulation Voltage regulation The change in voltage magnitude that occurs when the load (at a specified power factor) is reduced from the rated or nominal value to zero, with no intentional manual readjustment of any voltage control, expressed in percent of nominal despite variations in line, load, and temperature, yet the device dissipates very little power. Designed to control two external pass N-channel FETs for regulation of two independent supply planes, the device is optimized for use in modern microprocessor-based designs. For example, the SC338 can be used to provide 1.8V, 1.5V, or 1.2V required by the latest generation of chipset and peripheral components. Adjustability down to 0.5V means existing designs can be easily adapted as future voltage requirements move below 1V. For low voltage input-to-output differential supplies, the SC338 enables designs to be built without a switching regulator, thereby reducing component count. Eliminating the inductor inductor, electric device consisting of one or more turns of wire and typically having two terminals. An inductor is usually connected into a circuit in order to raise the inductance to a desired value. and bulk capacitance capacitance, in electricity, capability of a body, system, circuit, or device for storing electric charge. Capacitance is expressed as the ratio of stored charge in coulombs to the impressed potential difference in volts. requirements required in switching regulator designs also provides a significant reduction in total solution cost. The SC338 also avoids the ripple and transient response In electrical engineering and Mechanical Engineering, a transient response or natural response is the response of a system to a change from equilibrium. Specifically, transient response in Mechanical Engineering is the portion of the response that approaches zero after a limitations that can arise from using a switching regulator, helping to meet increasing tight voltage accuracy requirements without incurring higher solution costs. The SC338 devices provide enable inputs for each linear FET controller, as well as separate power good signals, which provides complete flexibility in meeting power-sequencing requirements. An under-voltage protection mechanism turns off an output if it falls below 50% of the nominal voltage, providing inherent over-current protection in the process. "The SC338, the latest in our Smart 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 family of application-specific power management devices, gives system engineers a new edge in their challenge to shrink, simplify, and cut costs from designs," said Eddie Yeow, Director of Portable Power Management. "These devices will continue to serve as a testament to Semtech's commitment to deliver advanced power control solutions." Key Features of the SC338 -- Simplifies layouts and reduces component count, board space, and costs -- Wide input supply range (4.5V to 13.2V), with two independent and fully adjustable outputs -- Dropout performance and output currents controlled by low-cost external FETs -- Output accuracy flexibility, +/-1.5% or 2.5% reference voltage options -- Very low quiescent current in shutdown mode -- Superior load and line regulation performance -- Compact MSOP-10 package Pricing and Availability The SC338 in a 10-pin MSOP MSOP Mini Small Outline Package MSOP Mini Series of Poker MSOP Minnesota Sex Offender Program MSOP Management Stock Option Plan MSOP Memphis School of Preaching (Memphis, TN) MSOP Minimum Sum-Of-Products package is available immediately in production quantities, priced at $0.90 in 1000-piece lots. Semtech offers comprehensive design assistance, including field- or factory-based support, and datasheets are available at www.semtech.com. About Semtech Semtech Corporation is a leading supplier of high-quality analog and mixed-signal semiconductor products. The company is dedicated to providing customers with proprietary solutions and breakthrough technology in power management, protection, advanced communications, human interface, test and measurement, and high-speed clock/logic products. Publicly traded since 1967, Semtech is listed on the NASDAQ National Market under the symbol SMTC. For more information, contact Semtech Corp. at 200 Flynn Road, Camarillo, CA 93012-8790; phone 805/498-2111; email to info@semtech.com; or visit its Web site at www.semtech.com. |
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