Synchronous Buck Controllers suit rail or POL generation.

Press Release Summary:

Models ADP1870 and ADP1871 incorporate constant on-time and valley current-mode techniques to drive all N-channel power stages, regulating output voltages as low as 0.6 V with ±1.0% accuracy. Available in 300 kHz, 600 kHz, and 1 MHz frequency options, products support 2.95-20 V input and feature internally fixed soft-start period and valley-detect current sense. Additionally, ADP1871 offers power-saving mode capable of pulse-skipping.

Original Press Release:

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

- ADI's ADP1870 and ADP1871 buck controllers incorporate constant on-time and valley current-mode techniques to drive all N-channel power stages, regulating output voltages as low as 0.6 V.

NORWOOD, Mass.-- 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 
    Now Now -40°C to +125°C $0.96 10-Lead MSOP

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    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.
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