LM4128DMFX-3.3

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LM4128DMFX-3.3 application field and working principle

LM4128DMFX-3.3 is a low dropout linear regulator of the voltage reference PMIC (power management IC) family. These PMICs are employed in electronic products to regulate voltage and achieve power savings, giving system designers options in circuitry and control. The LM4128 is a three-terminal linear regulator that uses Sanyo’s patented DROK (Dropout Regulation On Micro Killi) technology.

The LM4128DMFX-3.3 is ideal for precisely controlling the supply voltage to applications such as microprocessors and digital signal processors, which require high accuracy and very low dropout voltage. This regulator has a maximum dropout voltage of 200mV with a minimum quiescent current of 400uA. With excellent line and load regulation, fast response time and superior ripple rejection, the LM4128DMFX-3.3 is the ideal regulator for regulating voltage for these sensitive applications.

APPLICATION FIELD:

The LM4128DMFX-3.3 is ideal for use in automotive, industrial and consumer applications where precise voltage regulation is required and power savings is a key factor. Automotive applications include power steering and anti-lock brake systems; industrial applications include motor control and medical device monitoring; and consumer applications include gaming consoles and cellular phones.

WORKING PRINCIPLE:

The LM4128DMFX-3.3 is a three-terminal linear regulator that uses Sanyo’s patented DROK (Dropout Regulation On Micro Killi) technology. At the heart of the LM4128DMFX-3.3 is an error amplifier, a power transistor and a reference circuit which is employed to regulate the output voltage. The reference circuit contains high accuracy resistors and capacitors, which form an internal voltage divider. The output voltage is set by this voltage divider and can be adjusted by the user.

In operation the reference voltage is applied to the non-inverting input of the error amplifier and the voltage on the output pin is applied to the inverting input of the amplifier. If the output voltage is different from the reference voltage, the error amplifier adjusts the base bias of the power transistor to regulate the output voltage. The feedback network formed by the voltage divider and the error amplifier ensures that the output voltage is maintained within the specified tolerance.

The LM4128DMFX-3.3 also has a low dropout voltage of 200mV, enabling it to provide precise voltage regulation at very low input-output voltage drops. It also has fast response time, excellent line and load regulation, and superior ripple rejection.

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