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Compact dual 10A or single 20A µModule regulator powers FPGAs, GPUs, ASICs and system power

A dual 10A or single 20A output, step-down µModule point-of-load regulator from 5V or 12V input supply rails has been announced by Analog Devices.

The Power by Linear LTM4646 is said to include the inductors, MOSFETs, a DC/DC controller and supporting components and is housed in a 11.25mm x 15mm x 5.01mm BGA package.

Analog Devices says that compared to the prior 2 x single 10A output module solutions, the LTM4646 reduces the solution size of more than 25%.

It adds that total output voltage DC accuracy is guaranteed at ±1.5% over line, load and temperature (–40°C to 125°C) and that the onboard remote sense amplifiers on both outputs compensate for voltage drop caused by trace impedance of the PC board due to large load currents.

The device apparently has selectable internal or external feedback loop compensation, which should allow users to optimise loop stability and transient performance while minimising the number of output capacitors.

The peak efficiency at 12VIN to 1.0VOUT is said to be 86%. With 200LFM air flow, Analog Devices also claims the LTM4646 delivers a full 20A continuously up to 85°C ambient. The current mode architecture is designed to allow multiphase parallel operation to increase output current with what Analog Devices describes as ‘very good current sharing’.

Standalone, the LTM4646 is said to operate from 4.5V to 20V input range. When 5V external bias is available, the device is said to operate from 2.375V. The output voltages are apparently adjustable from 0.6V to 5.5V, enabling the device to generate not only low voltage for digital devices but also 2.5V, 3.3V and 5V.

Analog Devices says that the switching frequency can be programmed from 250kHz to 1.3MHz with one resistor, and can also be synchronised to an external clock ranging from 300kHz to 1MHz for noise-sensitive applications. It also features overvoltage and overcurrent protection.

Bethan Grylls

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