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DC/DC controller touts voltage tracking, sync capabilities

Posted: 17 Sep 2012 ?? ?Print Version ?Bookmark and Share

Keywords:ADI? ADP1851/53? DC/DC controller? communications networking? FET?

Analog Devices Inc. (ADI) has announced what it describes is a wide-input-range, synchronous, step-down DC/DC controller with voltage tracking and synchronization capability. The ADP1851/53 can be configured to work as a voltage-mode controller with input feed-forward or as a current-mode controller, depending on the application and customer preference, stated the company. In addition, the device targets high efficiency, high current, fast, transient point-of-load applications that include communications networking, industrial, medical, and consumer devices.

The ADP1851/53 can be connected in parallel to achieve higher current deliveryup to 50A depending on the external FETs. It features a synchronization input eliminating "beat" frequencies and reducing system input capacitance when multiple devices with phase-shifted synchronization are used, noted ADI. The ADP1851 also has a tracking capability that enables controlled startup. Simple, robust sequencing can be implemented using the precision enable and power good functions, said the firm.

In current-mode control, the ADP1851/53 architecture detects the current during the off period to improve noise immunity using the on-resistance of the low-side FETor a series sense resistor for higher accuracy. Externally adjustable slope compenzation is added to optimize performance in current mode. With minor adjustments to external resistor settings, the ADP1851/53 can be configured for voltage-mode control for improved noise performance, using input line feed-forward for excellent line rejection. The ADP1851/53 series has a selectable pulse-skip mode to increase efficiency during light load operation. The device also has an accurate current limit, which allows for the sizing selection of external components to optimize valuable PCB space. The ADP1851 and ADP1853 are supported by ADI's online ADIsimPower tools. The ADP1851ACPZ-R7 operates from -40C to 125C and costs $1.05 each for 1,000 pieces in 16-lead LFCSP (4 x 4mm) package. The ADP1851-EVALZ costs $60 each per 1,000 pieces.

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