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Single-phase DC/DC Controller implements IMVP-6/6+/6.5

July 21, 2010 | Paul Buckley | 222901235
Single-phase DC/DC Controller implements IMVP-6/6+/6.5 Linear Technology Corporation has introduced a single-phase synchronous step-down DC/DC controller implementing the Intel IMVP-6, IMVP-6+, and IMVP-6.5 protocols.
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Intel Mobile Voltage Positioning (IMVP) is a smart voltage regulation technology that effectively reduces the amount of output capacitance required for a given output error budget. On-chip support is provided for all the IMVP-6/6+/6.5 requirements, including a 7-bit VID code, start-up to a preset boot voltage (VBOOT), differential remote output voltage sensing, programmable active voltage positioning (AVP), output current reporting (IMON, IMVP-6.5) and power optimization during deeper sleep state to increase the battery run time.

The LTC3816 incorporates a parallel input, 7-bit digital-to-analog converter (DAC), which dynamically adjusts its output to the Intel CPU core supply voltage from 0 V to 1.500 V in 12.5 mV steps with +0.75 percent VOUT accuracy over temperature. It operates from an input voltage ranging from 4.5 V to 36 V, has powerful onboard N-channel MOSFET gate drivers and can control output currents up to 25 A. The devices leading edge modulation architecture enables a very low output voltage to be regulated from a high input voltage and still operates at high frequency (phase-lockable up to 550 kHz). A unity-gain differential amplifier provides remote voltage sensing at the CPU, eliminating errors due to parasitic IR drops across PCB metal traces.
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