MP2105DJ-LF-P

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DC/DC switching regulators provide a versatile and efficient means of converting DC power from a source to that required by a load. The Monolithic Power Systems, Inc. (MPS) MP2105DJ-LF-P is a synchronous step-down DC-DC converter with a wide range of output current capability up to 8.5 A. This device allows users to optimize their design for cost and efficiency by providing a wide voltage step-down ratio, and programmable features that makes it suitable for a variety of fields. It has an adjustable output voltage range from 0.8 to5 V, and it also features short circuit protection, thermal shutdown, external synchronization, and peak current setting.

Form Factor and Pin Configuration

The MP2105DJ-LF-P is a small, surface mount device encased in an SOT-25 package. It has a few key pins including IN, OUT, GND, FB (feedback), SYNC, and CNTRC (control). With its compact 11- pin configuration, it is ideal for space-sensitive applications. The control pin is a dual purpose pin that allows users to set the device to PWM or PFM mode by grounding it either on the bottom or top pad.

Features and Benefits

The MP2105DJ-LF-P provides a variety of features and benefits to users, such as its high efficiency, low operating current, and low component count. Its synchronous rectification results in very low reverse current, eliminating the need for an additional Schottky diode thus resulting in a high-performance, cost-efficient solution. Additionally, the device comes with input over-voltage shutdown and an adjustable soft-start, making it suitable for various input applications such as Li-ion, Li-polymer, or alkaline batteries. Additionally, the device offers three modes of operation: PWM fixed frequency at 1 MHz, PWM variable frequency, or PFM mode, depending on the control pin setting.

Limitations

The MP2105DJ-LF-P also comes with some limits, such as its maximum output current of 8.5 A. This necessitates the use of an additional external component for applications with higher load current. The device also has an operating temperature range of -40 to +85℃, making it suitable for most commercial applications, but not for extreme environment applications.

Applications

The MP2105DJ-LF-P can be used in various applications due to its versatile features. It is particularly suitable for battery-powered applications, such as tablets, mobile phones, and TVs, as it is designed to operate from a wide range of input voltages. Additionally, its compact size and ability to switch at 1MHz make it suitable for small, space-constrained applications such as handheld devices. The device is also suitable for automotive applications.

Working Principle

The MP2105DJ-LF-P is based on a current mode control (CMC) architecture, which utilizes a voltage feedback and current feedback loop to monitor and regulate the output voltage. The device can be set with an external resistor for peak current, allowing for a maximum current limit and over-load protection. The SYNC pin can also be used to externally synchronize to an external clock. When the device is in PWM mode, the frequency at which the internal PWM cycle works is determined by the externalclock. The device also features auto-frequency-hopping (AFH) to reduce interference from the output stage during periods of no load or light load condition.

Conclusion

The MP2105DJ-LF-P DC/DC switching regulator from MPS provides users with a high efficiency, space-efficient solution for applications that require a wide input voltage range. The device comes with various features, such as PWM/PFM modes, peak current setting, OVP protection, and built-in thermal protection. The device is suitable for a wide range of applications such as battery-powered mobile devices, automotive systems, and other space-constrained environments.

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