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Analog Devices Expands Range of Constant On-Time, Synchronous Buck Controllers

Mon, 03/15/2010 - 12:43pm

Analog Devices, Inc. (ADI), a global leader in high-performance semiconductors for signal-processing applications, today introduced two current-mode, synchronous buck controllers that support input-power voltages ranging from 2.95 V to 20 V. The ADP1870 and ADP1871 synchronous buck controllers provide superior transient response through the use of a constant on-time, current-mode control system. The devices are suited to intermediate rail or point-of-load generation in consumer, industrial and instrumentation, and telecommunications and networking applications.

The new buck converters also offer enhanced performance at low duty cycles by using a valley current-mode control architecture. The ADP1870 and ADP1871 are available in three frequency options – 300 kHz, 600 kHz, and 1 MHz. Additionally, the ADP1871 offers a power-saving mode capable of pulse-skipping to maintain output regulation while improving system efficiency at light loads. Low-voltage biasing is supplied through a 5-V internal LDO (low-dropout oscillator).

ADP1870 and ADP1871 Synchronous Buck Regulators -- Features and Benefits

Both regulators feature an internally-fixed soft-start period to limit input in-rush current from the input supply during startup and to provide reverse current protection during soft-start for a pre-charged output. Other features and benefits include:

  • Constant on-time architecture for improved transient response
  • Valley-detect current sense for improved noise immunity - no additional current resistor required
  • Power saving mode (ADP1871 only) for improved efficiency at light load
  • 0.6-V reference voltage with ±1.0 percent accuracy allows devices to be used in low-voltage, high-accuracy, point-of-load applications
  • Precision-enable ensures precise turn-on with internal soft-start

The introduction of the ADP1870 and ADP1871 devices marks ADI’s continued expansion of the switching controller and regulator product lines following recent announcements of the ADP1872/3 constant on-time, synchronous buck controllers and the ADP1877 fixed frequency, dual buck controller.

Availability and Pricing

Product   Samples   Availability   Temperature

Range

  Price Each Per 1,000   Packaging

ADP1870

ADP1871

  Now   Now   ?40°C to +125°C   $0.96   10-Lead MSOP

For more information on these products, visit http://www.analog.com/pr/ADP1870 or http://www.analog.com/pr/ADP1871. For more information on ADI’s integrated multi-function power portfolio, visit http://www.analog.com/pr/switching-regulators.

ADI in Power Management

Analog Devices brings world-class signal-processing prowess to a portfolio of innovative power-management ICs that complement high-performance signal-processing functions in a wide range of portable and fixed-power applications in consumer electronics, medical equipment, industrial and instrumentation, and communications infrastructure. By supporting signal-chain design requirements, such as dynamic range, transient performance, and reliability, ADI helps customers solve complex power challenges easily and quickly, differentiate their products, and get to market faster. Learn more about ADI's power-management ICs at http://www.analog.com/power.

About Analog Devices

Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged throughout the industry as the world leader in data-conversion and signal-conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Celebrating over 40 years as a leading global manufacturer of high-performance integrated circuits for analog and digital signal-processing applications, Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices' common stock is listed on the New York Stock Exchange under the ticker “ADI” and is included in the S&P 500 Index. http://www.analog.com

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