Analog Devices Inc. introduces two current-mode, synchronous buck controllers that support input-power voltages ranging from 2.75 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% 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. 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