Microchip announced a new Digitally-Enhanced Power Analogue (DEPA) buck controller for DC-DC power conversion which offers much flexibility. The single-chip MCP19122/3 solution controls DC-DC converters and is capable of accepting a high-voltage input up to 42 V while simultaneously regulating a wide output voltage range of 0,3 V to 16 V without any external components or drivers.
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 setpoints and maximum duty cycle. This level of configurability offers many application benefits. 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’s capabilities include a programmable differential input amplifier 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. 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. 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 onboard programmable diagnostic and fault detection capability, the MCP19122/3 is ideal for high-performance, intelligent power applications.
This device also offers excellent accuracy for an adjustable output power supply. An MCP19122/3 DC-DC converter implementation can maintain an initial 0,5% or better output voltage accuracy. In addition to the tight voltage regulation, the device is designed to deliver industry-leading current measurement by using a lossless inductor current-sense method with specialised internal measurement calibrations.
The device can directly accept a common-mode signal up to 16 V and report the load current to within 5% accuracy for most applications, with an emulated average current mode control for hardware based cycle-by-cycle current limiting.
For more information contact Andrew Athanasiou, Arrow Altech Distribution, +27 (0)11 923 9600, aathanasiou@arrow.altech.co.za, www.arrow.altech.co.za; Shane Padayachee, Avnet South Africa, +27 (0)11 319 8600, shane.padayachee@avnet.com, www.avnet.co.za
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