MP2128DT-LF-P

Voltage - Input (Max):	6V
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	2.8MHz
Current - Output:	1A
Voltage - Output (Max):	6V
Voltage - Output (Min/Fixed):	0.6V
Series:	--
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The MP2128DT-LF-P is a DC-DC switching regulator from Monolithic Power Systems (MPS). It is a step-down switching regulator with two outputs and a maximum total output current of 3A. It is designed to operate with both input and output capacitors, enabling a higher efficiency and improved transient performance. The wide input voltage range and adjustable output voltage make it suitable for a wide range of applications.

Application and Features

The MP2128DT-LF-P is ideal for powering voltage sensitive devices such as FPGAs, DSPs, and other low power analog or digital ICs. It is also suitable for power supply applications that require low voltage, low noise output with a low drop-out voltage and high efficiency.The MP2128DT-LF-P features a wide input range from 1.2V to 5.5V and a wide output voltage range from 0.9V to 5.5V. The switching frequency can be adjusted from 300KHz to 3MHz, offering flexibility for applications requiring low noise and high efficiency. The low drop-out voltage ensures the regulator\'s output remains stable even when the input voltage drops below the desired set point. The two outputs can be independently adjusted to different levels, allowing power in applications such as dual-core processors.

Working Principle

The MP2128DT-LF-P is based on MPS\' proprietary adaptive voltage scaling (AVS) technology. This technology is based on a control algorithm which adjusts the output voltage according to the load current and input voltage. When the load current increases, the output voltage will remain stable, as the voltage is adjusted to provide the necessary current.The switch mode power supply circuit starts with an oscillator generating a high frequency that is used by two transistors (normally referred to as the switch and diode) to generate the alternating current at the output. The current is then filtered to produce a steady, regulated output.The regulator uses a pulse-width modulated (PWM) control loop architecture to ensure the output is always kept in regulation. This architecture is based on a comparison of the output voltage with a reference voltage. If the output voltage is higher than the reference, the switch is turned off, reducing the output current until the output voltage drops. If the output voltage falls lower than the reference, the switch is turned on for a longer period, increasing the output current until the output voltage rises back to the desired level.

Conclusion

The MP2128DT-LF-P from MPS is a versatile, high efficiency DC-DC switching regulator. It is suitable for a wide range of applications and can provide a low voltage, low noise output with a low drop-out voltage. The wide input voltage range and adjustable output voltage make it suitable for a variety of applications. The adaptive voltage scaling (AVS) technology ensures the regulator is always kept in regulation and provides improved transient performance.

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