Semtech Expands EcoSpeed(TM) Regulator Platform with 1A and 2A Output Current Devices
SC171 and SC172 provide ultra-fast transient response, with ultrasonic power save for high efficiency across the entire load range
"We continue to respond quickly to strong interest in our EcoSpeed converter family, ensuring designers have the right solution for their given applications," said Alan Burchfield, Senior Product Marketing Manager for Semtech's Power Management Group. "The SC171 and SC172 deliver the same features and functions of our popular 3A and 4A SC173 and SC174 devices, with lower, 1A and 2A output currents."
Like all EcoSpeed regulators, the SC171 and SC172 incorporate Semtech's advanced, patented adaptive on-time (AOT) architecture to achieve best-in-class performance for today's demanding green power requirements by efficiently managing both standby and full current demands. The AOT architecture uses an advanced control loop that eliminates the need for loop compensation components and enables the use of ceramic input and output capacitors.
Both the SC171 and SC172 are programmable from 200kHz to 1MHz, enabling designers to optimize their power supply to maximize either the conversion efficiency or the solution size. They also feature Semtech's proprietary SmartDrive(TM) technology, which is a two-step, high-side FET turn-on technology designed to reduce EMI in noise-sensitive applications.
Additionally, both devices provide high efficiency across the entire load range, with up to 95% peak operating efficiency and selectable, ultrasonic power save (PSAVE), which lowers the switching frequency to cater to light-load requirements during standby. When the load changes from standby to full load, the cycle-by-cycle response of the EcoSpeed architecture quickly exits PSAVE mode to provide very fast wake-up recovery time. This enables power designers to meet "green" regulations, while maintaining fast user performance. To eliminate audible noise during standby, the ultrasonic PSAVE configuration maintains switching frequencies above the 25kHz audible threshold.
The SC171 and SC172 regulators incorporate soft-start to reduce inrush and minimize stress on the input power source, along with dedicated power-good and enable pins to simplify power supply design. Comprehensive fault protection features include cycle-by-cycle current limit and short circuit, over and under output voltage, and over-temperature protection.
Key Features of SC171 and SC172 EcoSpeed Regulators
- IOUT: SC171 = 1A, SC172 = 2A
- Ultra-fast transient response
- Very high efficiency across the entire load range; up to 95% peak operating efficiency
- No external compensation components required
- Enables use of ceramic input/output capacitors for design flexibility, optimized BOM costs
- Ultrasonic PSAVE: eliminates audible noise during standby
- Pseudo-fixed switching frequency (programmable 200kHz to 1MHz)
- SmartDrive(TM) technology reduces EMI
- 10-pin MLPD package - 3.0 x 3.0 x 1.0 mm
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Pricing and Availability
The SC171 and SC172 are available immediately in production quantities. The SC171 is priced at $0.73 each and the SC172 is priced at $0.77 each, both in 3,000-piece lots. The ordering codes are SC171MLTRT and SC172MLTRT. Evaluation boards (order code SC410EVB) are also available. 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 at http://www.semtech.com/info.
Semtech Germany GmbH
Semtech Corporation is a leading supplier of analog and mixed-signal semiconductors for high-end consumer, computing, communications and industrial equipment. Products are designed to benefit the engineering community as well as the global community. The company is dedicated to reducing the impact it, and its products, have on the environment. Internal green programs seek to reduce waste through material and manufacturing control, use of green technology and designing for resource reduction. Publicly traded since 1967, Semtech is listed on the NASDAQ Global Select Market under the symbol SMTC. For more information, visit http://www.semtech.com.