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Buck controllers pack constant on-time, valley current-mode

Posted: 27 Jul 2010     Print Version  Bookmark and Share

Keywords:current-mode  buck controller  voltage converter 

Analog Devices Inc. (ADI) rolls out two current-mode, synchronous buck controllers, the ADP1882 and ADP1883 that the company claims provides superior transient response through the use of a constant on-time, valley-current-mode control system. These new and versatile devices are well suited to intermediate rail or point-of-load generation in consumer, industrial instrumentation, telecommunications, and networking applications.

Supporting input-power voltages ranging from 2.75V to 20V, the valley-current-mode control architecture allows the ADP1882 and ADP1883 to offer optimum performance at low duty cycles and drive all N-channel power stages to regulate output voltages as low as 0.8V with ±1.0 per cent accuracy to as high as 7V with output up to 15A.

"The new ADP1882 and ADP1883 buck controllers offer enhanced performance at low duty cycles by using a valley-current-mode control architecture," said Laurence McGarry, marketing manager, Power Management Products Group. "Each is available in three frequency options: 300kHz, 600kHz, and 1MHz. The ADP1883 offers an additional power saving mode capable of pulse skipping to maintain output regulation while improving system efficiency at light loads."

Features of the ADP1882 and ADP1883 synchronous buck controller include an internally-fixed, soft-start period that enables a limited input in-rush current from the input supply during start-up and reverse current protection during soft-start that provides a pre-charged output. Other benefits include thermal overload and short circuit protection that allows for a more robust system design and no requirement of current-sense resistor that allows improved system efficiency and ease-of-use.

The ADDP1882 and ADDP1883 are available in 10-lead MSOP package for -40°C to +125°C temperature ranges. Samples are available. Pricing is Rs.48.10 ($1.03) for 1,000 units.

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