The MCP19122/3 Digitally Enhanced Power Analog (DEPA) buck controller suits dc/dc power conversion. The single-chip solution controls dc/dc converters and is capable of accepting a high-voltage input (up to 42 V) while regulating an output voltage range from 0.3 to 16 V without any external components or drivers.
The internal PIC microcontroller in the MCP19122/3 dynamically adjusts the operating frequency, over- and under-voltage lockout thresholds, current limits, soft-start, voltage or current output setpoints, and maximum duty cycle. The device dynamically adjusts the voltage output to meet USB PD requirements, while also adjusting the output over-voltage lockout to maintain tight protection limits corresponding to each output voltage level.
The MCP19123 buck controller offers a programmable differential input amplifier used to optimize performance and minimize system voltage error. This configurability allows for an output voltage range commonly seen in USB power and battery charger applications. The device can synchronize to an external clock and voltage reference, or provide the internal system clock and reference to other devices for synchronization.
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 it targets high-performance intelligent power applications.
This device also offers excellent accuracy for an adjustable output power supply. A MCP19122/3 dc/dc converter implementation maintains an initial 0.5% or better output voltage accuracy. It offers current measurement by using a lossless inductor current sense method with specialized 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.
The devices 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 production starting at $2.94 each in 10,000 unit quantities. The MCP19123 is available today in a 5 x 5 QFN package starting at $3.17 each in 10,000 unit quantities. Microchip : www.microchip.com
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