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1A and 2A Output Current Devices Provide Ultra-fast Transient Response

Thu, 02/24/2011 - 4:00am
sc171_SC172Semtech Corp. today launched the SC171 and SC172 buck regulators. These 1A and 2A output current devices are the latest additions to the company’s EcoSpeed DC-DC converter platform, which includes a broad selection of output current capabilities ranging from 1A to 30A. EcoSpeed converters help designers meet emerging green power requirements by efficiently managing both standby and full current demands in networking and office automation equipment, set-top boxes, portable products, power supply modules and other embedded products, including dynamic point-of-load (POL) applications.

“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 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™ technology reduces EMI
- 10-pin MLPD package – 3.0 x 3.0 x 1.0 mm

Applications
Cable Modem: Switching Regulators
GPON - Gigabit Capable Passive Optical Network: Switching Regulators
HDTV: Switching Regulators
Laser Printer: Switching Regulators
Notebook PC, Tablet PC, Netbook: Graphics Memory Controller, I/O Controller Hub, Peripheral Power Router and Switch: Switching Regulators Set Top Box: Switching Regulators Wireless Base Station: Low Current Power, System Control Processor Wireless Node B: Low Current Power, System Control Processor

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.

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