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LP3990 – A Positive Voltage Regulator : Working & Its Applications

Nikita Bisen by Nikita Bisen
August 30, 2022
in Knowledge Base
0
  • The voltage regulator device gives a regulated output to a device for proper working.
  • So, other device gets damaged if we give a fluctuating voltage at the input.
  • A voltage regulator is used for this type of circuit and the feedback differential amplifier is used to regulate the output.
  • LP3990 is a positive voltage regulator device that is a low noise, low quiescent current positive voltage regulator.
  • This device is specially designed for digital applications and it’s stable with a spacing-saving small ceramic capacitor of 1microfarad.
LP3990

Working/Block Diagram

 

Block Diagram of LP3990

Enable (EN):

  • This Enable (EN) pin is internally held low by a 1-MΩ resistor to GND.
  • If the device is fully enabled under all operating conditions then Enable pin voltage must be higher than the VIH threshold.
  • If the device is fully disabled then EN pin voltage must be lower than the VIL threshold.
  • If the EN pin is left open will then the LP3990 output be disabled.

Thermal Overload Protection (TSD):

  • It disables the output when the junction temperature increases to approximately 155°C which allows the device to cool.
  • The output circuitry enables then the junction temperature to cool to approximately 140°C.
  • The thermal protection circuit is operated based on the value of power dissipation, thermal resistance, and ambient temperature.
  • The circuitry of the LP3990 has been designed to protect against temporary thermal overload conditions.

Pin Configuration

 

Figure: – LP3990 DSBGA Layout
  • Pin A1 is the common ground GND.
  • Pin A2 is the enable input pin EN.
  • Pin B1 is the output pin Vout.
  • Pin B2 is the input pin, Vin.

 

Figure: – LP3990 SOT-23 Layout
  • Pin-1 is the input pin IN.
  • Pin-2 is the common ground GND.
  • Pin-3 is Enable input EN.
  • Pin-4 doesn’t have any internal connection.
  • Pin-5 is the output pin OUT.

 

Figure: – LP3990 WSON Layout
  • Pin-1 is the voltage output OUT.
  • Pin-2 is the common ground GND.
  • Pin-3 doesn’t have any internal connection.
  • Pin-4 doesn’t have any internal connection.
  • Pin-5 is the Enable input EN.
  • Pin-6 is the voltage supply input IN.

Applications of LP3990

  • Used in portable, battery-powered systems.
  • This device is applied in Cellular Handsets.
  • Hand-held portable systems use this IC.
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Nikita Bisen

Nikita Bisen

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