LT3021EDH-1.8#PBF

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LT3021EDH-1.8#PBF Application Field and Working Principle

The LT3021EDH-1.8#PBF is an integrated low dropout positive voltage regulator. It belongs to the Power Management Integrated Circuits (PMICs) grouping, in the Voltage Regulators sub-grouping, and the Linear Category, offering a wide range of features and high performance.

The LT3021EDH-1.8#PBF is popularly used in applications involving the need of ultra-low noise, low dropout voltage and high voltage output, such as medical, industrial, automotive, communications, audio and RF circuits.

Features and Benefits

• Voltage Regulation:
  • 400mV Dropout Voltage
  • Output Voltage from 1.8V to 17V
  • Internal Reference Voltage: 0.8V
• Current Output Current: 200mA
• Quiescent Current: 5µA
• Short Circuit Protection
• Voltage and Current Control
• Thermal Shutdown Protection
• Low Noise (˜1µVRMS)
• High PSRR (˜90dB)

Working Principle

The LT3021EDH-1.8#PBF uses a voltage bandgap reference and an error amplifier to form a closed-loop preamplifier in order to achieve regulation output voltage. The error amplifier is used to compare the output voltage with the reference voltage. A small current is then sent to the pass transistor\'s gate to achieve the desired output voltage through a feedback loop while the pass transistor is controlling the current flow of the output load. The difference between input and output voltage (also known as the dropout voltage) is determined by the pass transistor\'s current rating.

Conclusion

The LT3021EDH-1.8#PBF allows for applications involving the need for ultra-low noise, low dropout voltage and high voltage output. With features such as 400mV Dropout Voltage, output voltage from 1.8V to 17V, Internal Reference Voltage of 0.8V and current output up to 200mA the LT3021EDH-1.8#PBF is the ideal choice for a wide variety of industrial, automotive, communications, audio and RF circuits.

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