MIC3975-1.65BMM

Voltage Dropout (Max):	0.5V @ 750mA
Base Part Number:	MIC3975
Supplier Device Package:	8-MSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	--
Current - Output:	750mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.65V
Voltage - Input (Max):	16V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Discontinued at Digi-Key
Packaging:	Tube

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Introduction

The MIC3975-1.65BMM is a Linear Voltage Regulator which is typically used in portable instruments, consumer electronics, telecoms and medical devices. The linear voltage regulator (LVR) is an integrated circuit which takes input voltage (VIN) and regulate the output voltage (VOUT) of the device. It is composed of Power MOSFETs and other components which provide voltage stabilization. The unique features of this Voltage regulator make it suitable for a wide range of applications where precise voltage regulation is needed.

Application Field and Working Principle of the MIC3975-1.65BMM

The MIC3975-1.65BMM Linear Voltage Regulator is a programmable regulator well suited for implementing power management systems in many applications. It is designed to provide a highly reliable, small footprint and low drop-out (LDO) voltage regulator solution with voltage precision capabilities from 0.63 V up to 1.65 V.The XLE7FN2030 N-Channel MOSFET is the main component in the device. It is used as a high speed switch with programmable voltage drop. The output voltage is determined by two external resistors, referred to as R1 and R2. The resistor values are chosen in order to set the desired regulated output voltage. The rise in the voltage across R1 Q VIN will drive the gate capacitance of the XLE7FN2030 to charge, turning it on. This in turn will force the voltage drop across R2 to be equal to the desired output voltage. When the output voltage is higher than the input voltage, the voltage regulator will turn off to protect the IC. The MIC3975-1.65BMM is designed with an extremely low quiescent current of 15 uA at 1% load capacitance and 25 uA at 0.1% load capacitance.In order to provide precise regulation, the internal circuitry consists of a voltage reference and an error amplifier. The internal reference generates a precise reference voltage which is used by the error amplifier to compare this voltage with the desired output voltage, as set by R1 and R2. The error amplifier then adjusts the gate charge of the XLE7FN2030 MOSFET to ensure a precise output voltage.The MIC3975-1.65BMM also features a integrated MOSFET current-limit function. This function monitors the drain current of the XLE7FN2030 in order to keep it within the safe current limit. This is useful for both overload protection and inrush current protection.

Conclusion

The MIC3975-1.65BMM Linear Voltage Regulator is a highly versatile device which is suitable for a wide range of application fields where precise voltage regulation is needed. It is designed with a low drop-out feature which allows it to maintain stable output voltage even with highly varying input voltages. The integrated MOSFET current limiting feature provides both overload protection and inrush current protection. Overall, the MIC3975-1.65BMM is an ideal solution for wide range of applications.

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