The MPQ86xx series of Monolithic Power Systems is a fully integrated high-frequency, synchronous step-down converter. These converters provide a very compact solution to achieve output currents up to 12 a, with good load and line regulation, over a wide input power range. They work efficiently in a wide range of output current loads, and use internally compensated normally open time (COT) control to provide fast transient response and easy loop stability. The operating frequency can be set to 600 kHz, 800 kHz, 1000 kHz, 1100 kHz, or 2000 kHz with the mode configuration, allowing the frequency of the MPQ86xx to remain constant regardless of the input and output voltages.
The output voltage start ramp is controlled by an internal 1.5 ms timer, which can be increased by adding a capacitor to the TRK/REF. A good drain power (PGOOD) signal indicates whether the output is within its nominal voltage range. When the input power supply cannot supply power to the converter, PGOOD clamps about 0.7 V with an external pull-up voltage. Complete protection functions include over-current protection (OCP), over-voltage protection (OVP), undervoltage protection (UVP), and over temperature protection (OTP). MPQ86xx requires a few off the shelf standard external components, which can be used in a variety of QFN packages.
