Semtech Debuts Step Down Regulator with Less Than 1mV Supply Ripple, Setting Industry Standard for Low-Noise Performance.CAMARILLO, Calif. -- SC190 is a 300mA Switching DC-DC DC-DC Direct Current to Direct Current (power conversion) Buck Regulator that is up to 95% Efficient, Offers Four Dynamically Adjustable Output Voltages and Has Ultra Low Quiescent quiescent at rest; latent; the G0 stage of the cell cycle. Current 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 SC190, a programmable DC-DC step-down (buck) regulator that offers the industry's cleanest power signal - with less than 1mV supply ripple - for noise sensitive, battery-powered portable applications. The SC190's flexibility comes from its dual-mode capability. At higher output currents, best efficiency is achieved operating in pulse-width-modulation (PWM (Pulse Width Modulation) A modulation technique that generates variable-width pulses to represent the amplitude of an analog input signal. Like its fixed-width pulse density modulation (PDM) cousin, the output switching transistor is on more of the time for a ) switching mode while at lower output currents, efficiency is higher in the linear regulator In electronics, a linear regulator is a voltage regulator based on an active device (such as a bipolar junction transistor, field effect transistor or vacuum tube) operating in its "linear region" (in contrast, a switching regulator is based on a transistor forced to act as an mode. The device can be easily switched between modes by using the mode select pin. As a linear regulator, the SC190 features an integrated front-end 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 (FELDO) pre-regulator designed to filter incoming power signals. This lowers the input ripple noise to 1mV compared to the 10mV typical in a PWM switching mode. Low input ripple performance is very desirable for cell phones and many other RF or wireless applications where a noisy power supply can degrade system performance. Ideal for light load operation, an integrated back-end low dropout (BELDO) regulator can be dynamically selected to bypass the PWM switching circuitry. This achieves device quiescent current of approximately 10uA with low output voltage ripple of 90uV rms (typical). Competitive architectures often use pulse-skipping or pulse-frequency modes to regulate the output during light load conditions, which creates orders of magnitude higher output ripple. "Next-generation portable devices are increasingly sensitive to noise on power rails, and at 1mV, the SC190 has a five-times improvement over competing devices, which makes it a key component for these systems," said Larry King Larry King (born November 19, 1933) is an award-winning American writer, journalist and broadcaster. He currently hosts a nightly interview program on CNN called Larry King Live, one of the longest running talk shows on American air. , Semtech's Vice President of Power Management for Handheld Products. "There are no sacrifices for this low noise, as the SC190 is highly integrated, meets the need for low power consumption and takes up very little space." The SC190 has a built-in 1MHz-switching mode, or can accept external clock signals to synchronize the switching frequency between 750kHz to 1.5MHz (MegaHertZ) One million cycles per second. It is used to measure the transmission speed of electronic devices, including channels, buses and the computer's internal clock. A one-megahertz clock (1 MHz) means some number of bits (16, 32, 64, etc. . The SC190 is available in four voltage variants that provide a voltage range of 1.0V to 2.8V. With two-bit programmable output voltage capability, the necessary output voltage can be selected without need of a separate resistor divider divider See European currency quotation. . This feature eliminates two discrete resistors from a typical design, reducing board complexity, board space requirements and overall cost. The SC190 offers protection features including a thermal shutdown that shuts the device off when junction temperature Junction temperature is the temperature of the actual semiconductor in an electronic device. In operation it is usually higher than case temperature, the temperature of the part's exterior. reaches 150 degrees C, an internal current limit of 500mA on the front-end 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 to protect against a pulsed short circuit, an overvoltage shutdown feature, and a soft-start mode that limits in-rush current during start-up. The SC190 comes in a 3mm by 3mm MLP-10 package that is lead free and meets worldwide environmental requirements including the European Union's Restriction on Hazardous Substances in Electrical Equipment A piece of electrical equipment is a machine, powered by electricity and usually consists of an enclosure, a variety of electrical components and often a power switch. Examples of Electrical Equipment
Key Features of the SC190 --Less than 1mV supply ripple --Low quiescent current of 10uA --Choice of switching or linear regulation for output voltage --2.7V to 5.5V input range --300mA guaranteed output range --Fixed frequency 1 MHz or external synchronization (1) See synchronous and synchronous transmission. (2) Ensuring that two sets of data are always the same. See data synchronization. (3) Keeping time-of-day clocks in two devices set to the same time. See NTP. from 750kHz to 1.5MHz --Over-temperature and over-current protection features Pricing and Availability The SC190 family of products is available immediately in production quantities. SC190 variants are priced between $1.05 and $1.20 each in 1,000-piece lots. Ordering codes for the voltage variants are: --SC190AIMLTRT for 1.75, 1.80, 1.85, or 1.9 volt output; --SC190BIMLTRT for the 1.0, 1.2, 1.5, or 1.8 volt output; --SC190CIMLTRT for the 2.5, 2.6, 2.7, or 2.8 volt output; and, --SC190DIMLTRT for the 1.3, 1.35, 1.375 or 1.4 volt output. Semtech offers comprehensive design assistance, including field- and factory-based support. Data sheets, evaluation kits, samples, and price/delivery 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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