Semtech Adds New Power Management Controllers to Product Portfolio for Notebook CPU and GPU Applications.Single-Phase SC457 and Dual-Phase SC458 Controllers Support Fast 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 , Digitally Controlled Output and Long Battery Life CAMARILLO, Calif. -- 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 the SC457 and SC458 power supply controllers with digitally controlled output and fast transient performance for processors and graphics chips used in notebook computers. With a built-in 7-bit DAC See D/A converter and discretionary access control. DAC - Digital to Analog Converter , the output voltage of the SC457 and SC458 can be digitally programmed in 12.5 mV steps from 0.3V up to 1.5V for precision control over output voltages. Both devices have a programmable DAC slew rate to minimize transient currents and audible noise. Additionally, the devices feature a power-save function that boosts efficiency at light loads to extend battery life. The single-phase SC457 can drive up to 30A and is packaged in an 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. 5x5-32pin (5mm x 5mm) package so it is ideal for ultra small, lightweight notebook computers that need low-voltages for long battery life. The 60A, dual-phase SC458 can seamlessly switch between single and dual-phase operation for very efficient operation with no disturbance on the output voltage. The SC458 is provided in an MLP7x7-44pin (7mm x 7mm) package. Both devices are lead free and WEEE WEEE Waste from Electric and Electronic Equipment (directive) WEEE Waste Electrical and Electronics Equipment WEEE Waste Electrical and Electronic Equipment and RoHS compliant. The SC457 and SC458 feature a very fast hysteretic hys·ter·e·sis n. pl. hys·ter·e·ses The lagging of an effect behind its cause, as when the change in magnetism of a body lags behind changes in the magnetic field. voltage regulation scheme for a transient response of less than 10[acute accent]s. The use of hysteretic topology allows increased design flexibility and simplicity because it ensures the output is very stable and requires no equivalent series resistance (ESR ESR - Eric S. Raymond ). This architecture also minimizes output capacitance, reducing component counts, minimizing board footprint, and lowering cost. "The SC457 and SC458 are a new generation of dedicated controllers for notebook processors, and with their battery-saving features, fast transient response, and digital output programmability, we believe they offer dramatic added value over general purpose controllers," said Nejo Necar, Vice President of Marketing for Semtech's Power Management Group. "These controllers give notebook designers a substantive choice to meet the needs of notebook families, with a single-phase device for ultra lightweight notebooks, and a dual-phase device for desktop replacement models." For high efficiency, the SC457 and SC458 utilize Semtech's proprietary Smart Drive[TM] technology, which lowers ringing on the phase node and high-side 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 gate node to keep efficiency high while reducing EMI (ElectroMagnetic Interference) An electrical disturbance in a system due to natural phenomena, low-frequency waves from electromechanical devices or high-frequency waves (RFI) from chips and other electronic devices. Allowable limits are governed by the FCC. and eliminating the need for snubbers or gate resistors. Additionally, the SC458's current sensing system is based on Semtech's Combi-Sense[R] technology that eliminates the need for lossy See lossy compression. (algorithm) lossy - A term describing a data compression algorithm which actually reduces the amount of information in the data, rather than just the number of bits used to represent that information. , external sense resistors, thus keeping efficiency high and reducing cost. Both devices have a complete set of protection mechanisms, including programmable current limit, output over-voltage protection, input under-voltage 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 , and over-temperature protection. Key Features of the SC457 and SC458 * Input voltage: 5V and 5V - 25V * Digitally programmed output voltage: 0.3V - 1.5V (12.5mV steps) * Hysteretic control for fast transient response * Low ESR capacitance compliant * Supports ceramic decoupling Decoupling The occurrence of returns on asset classes diverging from their normal pattern of correlation. Notes: Take for example stock and corporate bond returns, which normally rise and fall together. solutions * Default 1.2V boot voltage * Soft OFF state * Active voltage positioning * Dynamic current sharing on SC458 Pricing and Availability The SC457 and SC458 are available immediately in production quantities. The SC457 is priced at $1.94 each in 1,000-piece lots with an ordering code of SC457MLTRT. The SC458 is priced at $2.80 each in 1,000-piece lots, and its ordering code is SC458IMLTRT. Semtech offers comprehensive design assistance, including field- and factory-based support. Data sheets, volume pricing, and delivery quotes, as well as evaluation kits and samples, are available by contacting salesinfo@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 & measurement, and wireless connectivity 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. Semtech and the Semtech logo are marks of Semtech Corporation. |
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