DUAL BUCK CONTROLLER REDUCES BILL OF MATERIAL COSTS IN DC-DC CONVERTER APPLICATIONS

- ADP1823 eliminates the need for sense resistors, large capacitors and inductors, thereby reducing component count and BOM costs by as much as 15 percent compared to competing solutions.
ADP1823

Norwood, MA (06/06/2006) - About the ADP1823 Dual Buck Controller
Analog Devices is expanding its family of power management switching regulators with the ADP1823 dual buck controller with pulse-width modulation (PWM), which provides high-efficiency dc-to-dc power conversion in a range of applications. The device generates two independent output rails, as low as 0.6V, from an input of 3 V to 20 V and enables synchronization to an external clock up to 1 MHz. The high switching frequency generated by the two channels reduces the amount of capacitance required by the device and reduces the bill of materials (BOM) and related costs, while the expanded voltage range enables a flexible solution for designers of power management systems.

Lower BOM Costs and Increased Design Flexibility
The ADP1823 reduces the need for large capacitors and inductors typically required by buck controllers, lowering overall system BOM costs by as much as 15 percent, compared to competing devices. The ADP1823 offers two independent channels, which operate 180 degrees out of phase to reduce stress on the input capacitor. The device operates at a pin-selectable frequency of either 300 kHz or 600 kHz or it can be synchronized to an external 300-kHz to 1-MHz clock. The device provides designers the flexibility of generating two independent output voltages from an input of 3 V to 20 V. Each buck controller can be configured to provide an output from 0.6 V to 85 percent of the input voltage and will drive large MOSFETs for point-of-load regulators.

High-Level of Accuracy and Current Limit Protection
The ADP1823 provides an accuracy of +/– 0.85 percent from 0 degrees Celsius to 70 degrees Celsius, which allows the output voltage to remain constant even when the input voltage varies. The two outputs contain individual “power-good” pins, offering current limit protection and reducing the chance of thermal overload by shutting down the board’s power supply when faults are detected. In addition, a tracking feature ensures the ADP1823’s voltage rails are powered up in the right order to prevent damage to other devices in the circuit. Additional features offered by the ADP1823 include soft-start, which minimizes inrush currents, and reverse current limit protection, which prevents the part from being damaged against pre-charged outputs. Using the ADP1823 in conjunction with ADI’s recently introduced ADM1175/6/7/8 hot swap controllers, designers can create reliable and efficient power supplies for a variety of applications.

Availability and Pricing
The ADP1823 is available in volume production now. It is priced at $2.10 per unit in 1,000-piece quantities and is packaged in a 5 mm x 5 mm, 32-pin LFCSP (lead-frame chip-scale package). The device is specified over the industrial temperature range (–40 degrees C to +85 degrees C).

About Analog Devices
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 industry-wide 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 40 years as a leading global manufacturer of high-performance integrated circuits used in 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.

Editor's Contact Information:

Sue Martenson
781/937-1989
781/937-1078
sue.martenson@analog.com

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