P9025A-0AWGI8

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PMIC, or Power Management Integrated Circuits, are an important part of a device’s power management system and involve the control of all energy supply components. Specialized PMIC is designed for specific application and the P9025A-0AWGI8 is no exception. This article will dive into the P9025A-0AWGI8’s application field, working principle and its various benefits.

Application Field

The P9025A-0AWGI8 is a low-dropout regulator (LDO) PMIC with multiple output voltages. It is designed to provide a system power solution with multiple voltage outputs, such as the modern Raspberry Pi 4 which requires multiple power rails to accommodate its memory, IO, clock and communications. Additionally, with its wide input voltage of 2.7V – 5.5V, it can safely be used in applications powered by a single Li-ion cell, secondary cells or a USB power adapter.

Working Principle

The working principle of the P9025A-0AWGI8 is a design that combines both a buck converter and an LDO regulator. The LDO is used to provide relatively stable output voltage over varying input conditions, while the Buck converter is employed to deliver a high current load with a fixed voltage.The P9025A-0AWGI8 first uses a bidirectional buck converter for heavy load steps, switching the output between input and capacitive loads. When the input voltage deviates from its optimal voltage, the converter switches its output to either the input (stepping up) or capacitive loads (stepping down) in order to maintain the desired voltage. As this output is relatively unstable, an additional LDO regulator is incorporated in order to maintain a steady output. The LDO is used to monitor the input voltage and adjust the output accordingly.The P9025A-0AWGI8 also has a low operating quiescent current of 18uA in its shutdown mode, making it energy efficient for devices that require long standby times. Additionally, its integrated current limiting and thermal shutdown features ensure reliability.

Benefits

The P9025A-0AWGI8 has the ability to provide tight regulation over the full input range with a minimum load current of 20mA and an ESR of 60mohm. Additionally, its high stepping ratio helps in reducing input ripple and EMI. This wide operation range and low ESR make it an ideal choice for applications that require tight regulation with low quiescent current as well as a wide operating temperature range.

Overall, the P9025A-0AWGI8 PMIC is an ideal solution for providing multiple stable output voltages for modern Raspberry Pi 4 and other low-power applications with a wide range of input voltages. Its combination of buck converter and LDO make it a reliable source of power for even less-than-optimal input environments. Other benefits include its low operating quiescent current and its integrated current limiting and thermal shutdown features for improved energy efficiency.

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