Semtech SC1401 Saves Space and Cost by Integrating Two Power Supply Controllers; For Notebook PCs and Other Space-Critical Portable Applications.Business Editors/High-Tech Writers NEWBURY PARK, Calif.--(BUSINESS WIRE)--Aug. 28, 2000 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 mixed-signal semiconductors for computers, communications, industrial, and automated test equipment, today announced availability of the SC1401 Power Supply Controller. The SC1401 integrates a high efficiency switching controller and a 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 controller into a single device. The SC1401 is designed to operate from a 6V to 30V input supply, making it ideal for notebook computer A laptop computer that weighs in a range from five to seven pounds. The term originated when laptops were routinely more than 10 pounds, and those that became lighter were placed in a special "notebook" category. In practice, notebook computer and laptop computer are synonymous. operation from either the battery or AC adapter. The on-board high-efficiency (greater than 90%) 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 synchronous power supply controller can be preset to generate 1.25V, or it can be adjusted with a simple resistor divider to provide any voltage between 1.25V and 5.5V. Integrated drivers deliver up to 2A of gate drive current, supporting use of the latest high-speed MOSFETs. N-channel devices can be used for both the top and bottom 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 , resulting in lower cost and improved efficiency. The SC1401 also contains a linear regulator controller capable of driving a low-cost N-channel MOSFET, with the output adjustable between 1.25V and 5.5V at up to 1A of current. The SC1401 offers fixed frequency operation at either 200kHz or 300kHz, with 200kHz offering the best efficiency, while 300kHz operation offers the lowest ripple, fastest transient response and/or smallest 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 output capacitor size. The SC1401 can also be synchronized to an external clock at frequencies up to 350kHz. The SC1401 incorporates several features designed to extend battery life in portable applications. Separate enable controls for the switching and linear controllers are provided, with supply current dropping to less than 10 micro-amps with both controllers off. The switching controller automatically enters a (selectable) power-save mode under light load conditions, effectively reducing the switching frequency and associated switching losses. The SC1401 provides an active-low reset output signal for controlling a microprocessor or DSP (1) (Digital Signal Processor) A special-purpose CPU used for digital signal processing applications (see definition #2 below). It provides ultra-fast instruction sequences, such as shift and add, and multiply and add, which are commonly used in math-intensive . Other features include built in digital soft-start circuitry to minimize inrush in·rush n. A sudden rushing in; an influx. in  rush ing adj. surge currents, tight
regulation over line, load and temperature; over-current, over-voltage
and over-temperature protection; and 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 . The SC1401
is rated for the industrial temperature range (-40 Degrees C to +85
Degrees C), ensuring reliable operation in the most rugged environments.
Pricing and Availability The SC1401 in SSOP-20 packaging is available through Semtech's network of direct sales representatives and distributors, and is priced at $2.75 in 1,000 unit quantities. Semtech's Family of Products for Notebook and Wireless Applications Semtech offers a full line of power management solutions for notebook and wireless applications, including switching regulators, ultra 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 (ULDO) linear regulators, and charge pumps. Typical features include small package size, low supply current and low power shutdown control, making them ideal for portable, battery-powered applications. About Semtech Semtech Corp. is a leading supplier of power management, transient protection, system management, high-performance, and advanced communications semiconductor products for portable and high-speed communications applications. Publicly traded since 1967, Semtech is listed on the NASDAQ National Market under the symbol SMTC. For more information and a comprehensive listing of Semtech's many employment opportunities, contact Semtech Corp. at 652 Mitchell Road, Newbury Park, CA. 91320; phone 805/498-2111; email to info@semtech.com; or visit the company online at www.semtech.com. |
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