Dual Output Synchronous Controller

Mar 23, 2011 2:44 PM

Analog Devices, Inc. (ADI) announced the availability of the ADP1850 synchronous DC-to-DC switching controller that is easily configurable as dual output or interleaved two-phase controller for a wide range of high-current, high-efficiency applications.

The ADP1850 offers more flexibility than other DC-to-DC controllers by providing a wider input voltage range of 2.75 V to 20 V, as well as easy configuration for dual-output (up to 2 x 25 A) or single interleaved-output (up to 50 A) systems. The ADP1850 provides accurate tracking capability between supplies and includes independent, precision ENABLE and accurate POWER_GOOD functions that allow simple, precise, and accurate daisy-chain sequencing between channels or another device - an important feature for powering multi-input voltage FPGA, DSP and ASIC devices. The ADP1850 controller's high-level of integration includes a start-up linear regulator and a boot-strap diode for the high-side drive, which is ideal for high-density designs.

The new DC-to-DC switching controller can be synchronized to an external clock to eliminate system beat frequencies between converters that can sometimes result in audible noise. The ADP1850 operates in current mode for improved transient response and uses valley-current sensing for enhanced noise immunity. The ADP1850's advanced architecture enables accurate current sharing between interleaved phases for high-current outputs up to 50 A. For low-load operation, the ADP1850 can be configured to operate in power-saving mode by skipping pulses and reducing switching losses to improve the energy efficiency at light load. Additional flexibility is provided by externally programmable loop compensation, soft start and frequency, current limit and current-sense gain settings.

The ADP1850 DC-to-DC controller is supported by a single-phase, 14 A and a two-phase, 50 A evaluation board, as well as the ADISimPower evaluation tool.

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