MPQ4559DN-LF

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MPQ4559DN-LF is a low dropout linear regulator from Monolithic Power Systems (MPS). Designed for applications where space is limited, the device has an on-chip power MOSFET and is offered in a tiny surface mount 2mm x 2mm DFN2020 package. MPQ4559DN-LF has low quiescent current and good power efficiency, enabling use in many portable and handheld applications, including ultra-low power systems, battery-powered and high-output voltage portable devices.

Classification: PMIC - Voltage Regulators - DC DC Switching Regulators

MPQ4559DN-LF offers low dropout voltage with no schottky diodes required, making it ideal for space-limited applications. The switching regulator includes an internal synchronous rectification MOSFET to reduce power dissipations and maximize efficiency. The device features a wide input voltage range (2.6V to 16V), and is capable of delivering up to 0.5A of load current. The internal Level-Shift circuit design provides excellent load regulation and low output deviation even when the input voltage is close to the output voltage.

The MPQ4559DN-LF is equipped with a power good indicator, and the sequential on/off level can be set via enabling/disabling PFET. The device is protected from overload current and overtemperature with internal built-in function. The output voltage is adjustable from 2V to 5V with an external resistor, and the maximum output current is 0.5A. The switching frequency is determined internally so that no external clock is required.

The MPQ4559DN-LF is a highly efficient and low noise switching regulator that operates over a wide temperature range, allowing use in various power conversion applications. The device has low current consumption and a highly integrated design, and it features built-in overvoltage protection and output shorts protection to enhance system\'s reliability. The MPQ4559DN-LF is ideal for space-constrained applications, such as medical and wearable devices, and it is available in a variety of package options to meet different end-user demands.

The basic working principle behind the MPQ4559DN-LF is a synchronous rectification topology, which uses the switching of the power MOSFET transistor to regulate the output voltage. A voltage feedback loop controls the switching frequency and the duty cycle of the power MOSFET, so that the output voltage remains constant. The switching circuit of the MPQ4559DN-LF is designed to operate at a fixed frequency, resulting in low acoustic noise and high efficiency.

The MPQ4559DN-LF is a highly integrated, low dropout and efficient device, with high power accuracy and low quiescent current consumption. Its flexible operating temperature range, small package size and integrated features make it an ideal solution for many applications in portable and handheld devices, such as ultra-low power systems, battery-powered and high output voltage portable devices.

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