Date: 20/07/2010

Synchronous buck controllers from ADI with valley current mode architecture

Analog has introduced the ADP1882 and ADP1883, two current-mode, synchronous buck controllers that support input-power voltages ranging from 2.75 V to 20 V. These buck controllers provide good transient response through the use of a constant on-time, valley-current-mode control system. This valley-current-mode control architecture allows these converters deliver 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 devices are suitable for 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."

The key features of ADP1882 and ADP1883 include:
1. An internally-fixed, soft-start period enables a limited input in-rush current from the input supply during startup.
2. Reverse current protection during soft-start provides a pre-charged output.
3. Constant on-time architecture enables fast transient response.
4. A current-sense resistor is not required allowing improved system efficiency.
5. Provides thermal overload and short circuit protection.

Availability and Pricing:
Product Samples Availability Temperature
Range Price Each
Per 1,000 Packaging
ADP1882

ADP1883 Now Now -40°C to +125°C $1.03 10-Lead MSOP


For more information visit: http://www.analog.com/pr/ADP1882