MCP19122/3 power analogue controller dynamically adjusts parameters

Claimed to offer more flexibility than any other analogue control architecture on the market today, the Digitally-Enhanced Power Analogue (DEPA) buck controller from Microchip is designed for DC/DC power conversion.

The single-chip MCP19122/3 controls DC/DC converters and is capable of accepting input voltage up to 42V, while simultaneously regulating a wide output voltage range of 0.3 to 16V without any external components or drivers, says Microchip.

The internal PIC microcontroller in the MCP19122/3 can dynamically adjust the operating frequency, over- and under-voltage lockout thresholds, current limits, soft-start, voltage or current output set points and maximum duty cycle. This level of configurability offers many application benefits, points out Microchip. For example, the MCP19123 can dynamically adjust the voltage output to meet USB Power Delivery requirements, while also adjusting the output over-voltage lockout to maintain tight protection limits corresponding to each output voltage level.

The MCP19123 buck controller includes a programmable differential input amplifier, which can be used to optimise performance and minimise system voltage error. This configurability allows for a wide output voltage range commonly seen in USB power and battery-charger applications, according to Microchip. Improving integration in larger systems, the device can synchronise to an external clock and voltage reference, or provide the internal system clock and reference to other devices for synchronisation. Microchip says that in server or communications equipment, this allows for seamless power-up and accurate tracking of power consumption throughout the board.

For high-power applications, multiple outputs can operate in parallel providing system redundancy for improved system reliability. Combined with an on-board programmable diagnostic and fault detection capability that Microchip says is unmatched in the industry, the MCP19122/3 is particularly suitable for high-performance intelligent power applications.

This MCP19122/3 DC/DC converter is also claimed to offer ‘excellent accuracy’ for an adjustable output power supply, according to Microchip. An MCP19122/3 DC/DC converter implementation can maintain an initial 0.5 per cent or better output voltage accuracy. In addition to the tight voltage regulation, the MCP19122/3 is designed to deliver industry-leading current measurement by using a lossless inductor current-sense method with specialised internal measurement calibrations. It can directly accept a common-mode signal up to 16V and report the load current to within five per cent accuracy for most applications, with an emulated average current mode control for hardware-based cycle-by-cycle current limiting.

The MCP19122/3 DC/DC converters are supported by Microchip’s suite of programming and development tools including MPLAB X Integrated Development Environment (IDE) and the MPLAB XC8 complier.

The MCP19122 is available today in a 4 x 4 QFN package for sampling and in volume. The MCP19123 is available today in a 5 x 5 QFN package.


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