MP20045DQ-33-LF-P

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Application Field and Working Principle of MP20045DQ-33-LF-P

PMIC - Voltage Regulators - Linear

The MP20045DQ-33-LF-P is a versatile power management integrated circuit (PMIC) solution, and is part of the linear voltage regulator product line from Monolithic Power Systems (MPS). It is designed to provide an output voltage of 3.3 V for use in a variety of applications.

The MP20045DQ-33-LF-P is a 3-terminal adjustable regulator that features both current-limiting and thermal overload protection. It provides output current up to 2.0 A while maintaining an extremely low energy consumption. It also has an active-high enable and a soft-start function to reduce power consumption, making it an ideal choice for applications that require energy efficient solutions.

Features

• Output voltage adjustable from 1.2 V to 33 V
• High efficiency (up to 95%)
• Low noise and fast response time
• Current limit and thermal overload protection
• Integrated enable and soft-start function
• Low quiescent current (Iq) of 2.5 mA
• Low operating temperature of -40°C to +125°C
• Available in 3-pin TO-220, SOT-223, and DPAK packages

Block Diagram

The MP20045DQ-33-LF-P is a 3-terminal adjustable linear regulator. It takes in the input voltage (Vin) to an adjustable frequency oscillator, which then drives the internal power MOSFET switch. The output voltage (Vout) is monitored and adjusted by the voltage reference and error amplifier circuit.

The current limit and thermal protection features provide protection against overloads and excessive temperatures. The enable signal provides an active-high signal that is used to control the output voltage of the regulator, while the soft-start function reduces inrush currents during start up.

Working Principle

The MP20045DQ-33-LF-P is based on the principle of feedback-controlled linear regulators. It works by controlling the gate voltage of a MOSFET power switch (internal to the IC) in response to an external reference voltage. When the voltage across the external reference falls below the reference voltage, the error amplifier creates an output voltage that is greater than the reference voltage. This increases the gate voltage of the MOSFET, thus increasing the amount of current delivered to the load.

When the load current increases and the voltage across the load rises above the reference voltage, the error amplifier creates an output voltage that is lower than the reference voltage. This decreases the gate voltage of the MOSFET and reduces the amount of current delivered to the load. As the voltage across the load approaches the regulator’s reference voltage, the output voltage of the regulator stabilizes.

Benefits of Using MP20045DQ-33-LF-P

• Reliable and safe operation
• High efficiency
• Low noise
• High output current
• Low quiescent current
• Available in different packages

The MP20045DQ-33-LF-P is an excellent choice for a variety of applications due to its high efficiency, low noise, and reliability. It is suitable for most 3.3 V applications, and its integrated current limit, thermal protection, enable, and soft-start features make it a versatile power management Integrated circuit (PMIC) solution.

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