MP5403BGQBU-P

Voltage - Input (Min):	2.7V
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	1.5MHz
Current - Output:	3.5A, 2.5A
Voltage - Output (Max):	6V
Voltage - Output (Min/Fixed):	0.6V
Voltage - Input (Max):	6V
Series:	--
Number of Outputs:	2
Output Type:	Adjustable (Fixed)
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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MP5403BGQBU-P Application Field and Working Principle

Introduction

The MP5403BGQBU-P (MP5403) is a high-efficiency Point of Load (POL) synchronous rectifier buck converter, suitable for high power and high-density applications. It operates from an input voltage range of 4.5V to 15V (VDD_IN) and provides up to 6A unconditional current from the output voltage ranging from 0.6V to 6V (VDD_OUT).The MP5403BGQBU-P is part of the PMIC - Voltage Regulator - DC DC Switching Regulators family and provides a wide range of features and benefits including low noise operation, wide output voltage range, high efficiency, and up to 94% efficiency over a wide input voltage range.

Application Field

The MP5403BGQBU-P is intended for use in automotive, industrial, and telecom and computing designs. It can be used in applications such as Smart Card Readers, Display Power Supplies, Sensors, and Medical Equipment. The MP5403 provides a wide range of features and benefits that make it ideal for demanding applications as mentioned above.The MP5403 is also suitable for a variety of applications that require high current capability in a small footprint, including display power supplies and small processor voltage loads. It can also be used in USB power devices, datacom applications and automotive lighting.

Working Principle

The MP5403BGQBU-P synchronous rectifier buck converter consists of two main stages, the main control loop and the synchronous rectifier. The main control loop includes a reference voltage input (VREF) and an error amplifier (EA) which compares the reference voltage with the output voltage. The error amplifier regulates the PWM comparator (COMP) switching profile, completing the loop to provide the feedback required for a precise output voltage setpoint.The PWM comparator compares the error amplifier output voltage (EA_OUT) with a sawtooth waveform (TGT_COM). If the error amplifier output voltage is higher than the sawtooth waveform, the comparator output will be high maximizing the on-time of the upper MOSFET and sinking current into the inductor. If the error amplifier output is lower than the sawtooth waveform, the comparator output will be low, releasing the upper MOSFET and forcing the lower MOSFET to switch on, sourcing current from the inductor.The lower MOSFET switch is controlled by a pulse with modulation (PWM) signal generated by the external EN pin, reducing the area of the inductor duty cycle. The external EN pin can be used to enable/disable the synchronous rectifier circuit.When the upper MOSFET is on, the current starts to flow through the inductor, storing energy in the form of magnetic field. As the upper MOSFET is switched off, the magnetic field collapses, forcing the current to flow through the diode and then to the output capacitor. As the energy is stored in the output capacitor, a stable output voltage is maintained.

Conclusion

The MP5403BGQBU-P is a high-efficiency Point of Load (POL) synchronous rectifier buck converter suitable for high power and high-density applications. It is part of the PMIC - Voltage Regulator - DC DC Switching Regulators family and provides a wide range of features and benefits ideal for demanding applications such as Smart Card Readers, Display Power Supplies, Sensors, and Medical Equipment. The working principle of MP5403BGQBU-P is based on the main control loop and synchronous rectifier, which performs the main regulation tasks. The MP5403BGQBU-P is the ideal choice for high current and small footprint applications.

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