NORWOOD, USA: Analog Devices Inc. (ADI) has introduced two current-mode, synchronous buck controllers that support input-power voltages ranging from 2.75 V to 20 V. The ADP1882 and ADP1883 synchronous buck controllers provide superior transient response through the use of a constant on-time, valley-current-mode control system.
In addition, 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 0.8 V with ±1.0 percent accuracy to as high as 7 V with output up to 15 amps. These new and versatile devices are well suited to intermediate rail or point-of-load generation in consumer, industrial instrumentation, telecommunications, and networking applications.
“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: 300 kHz, 600 kHz, and 1 MHz. The ADP1883 offers an additional power saving mode capable of pulse skipping to maintain output regulation while improving system efficiency at light loads.”
ADP1882 and ADP1883 synchronous buck controller features and benefits
* An internally-fixed, soft-start period enables a limited input in-rush current from the input supply during startup.
* Reverse current protection during soft-start provides a pre-charged output.
* Constant on-time architecture enables fast transient response.
* A current-sense resistor is not required allowing improved system efficiency and ease-of-use.
* Thermal overload and short circuit protection allows for a more robust system design.
The introduction of the ADP1882 and ADP1883 devices marks ADI’s continued expansion of the switching controller and regulator product families – following recent announcements of the ADP1870/ADP1871 and ADP1872/ADP1873 constant on-time, synchronous buck controllers and the ADP1877 fixed-frequency, dual buck controller.