Usb power booster3/22/2023 ![]() ![]() Figure 1 shows the charging profile of a Li-ion battery.Įarlier USB specifications allowed for a fixed 5V supply voltage. Then after reaching a specific voltage, the charging changes to constant voltage (maintaining a fixed voltage while the charge current gradually reduces). The standard process for charging a Lithium-ion battery starts with a constant current charging state (maintaining a fixed constant current while the battery voltage gradually increases). This power source control is an effective way to reduce power conversion losses, which is especially useful when a dedicated battery charger adds another level of conversion loss. The receiving powered device can request that the source make these changes. ![]() PPS capabilities allow for small stepwise changes to be made to the voltage and current. A PPS power source can exchange data with the powered device every 10 seconds, so the power source can dynamically adjust the output voltage and current according to the conditions set by the device that is receiving the USB power. The PPS standard is part of the USB PD Specification (available at usb.org), and mainly focuses on facilitating fast battery charging. The USB Programmable Power Supply (PPS) Specification Requirements This article will also describe how to utilize a DC/DC converter with a suitable USB PD controller for a complete PD solution. Using the MPQ4272 boost / buck converter and MPQ4230 buck-boost converter from MPS as examples, device operation will be analyzed to optimize the switching frequency and peak current to minimize power delivery losses. It will cover the major aspects of design, including component selection, board layout, and functional optimization using programmable features and settings. The system must meet the demands of the current and voltage regulations listed in the PPS specifications, while still enabling fully functional USB Type-C products. This article will focus on how to implement a complete USB C power delivery (PD) solution with flexible functionality. The programmable power supply (PPS) specification for USB power sourcing adds even more functionality for the power conversion device to integrate. As power density increases - particularly in multiple-power port or hub applications - efficiency becomes paramount, and requires the lowest power loss to minimize internal heat. Generating USB Type-C (also called USB-C) charging power for multiple peripherals requires a flexible DC/DC converter that can work with a controller to deliver the desired voltage and current capability to the corresponding device. Switching Converters and Controllers AECQ Grade.BLDC Pre Drivers and Integrated Solutions.Digital Isolators with Integrated Power.Multi Phase Controllers & Intelli-Phase. ![]()
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