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Low Voltage - Low Dropout Regulator

Low Voltage - Low Dropout Regulator. LDO Character. LDO stands for Low Drop-Out Regulator Minimize the difference between the input and output voltage when it ceases to regulate Provide a relatively simple and inexpensive power management solution. LDO Block Diagram.

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Low Voltage - Low Dropout Regulator

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  1. Low Voltage - Low Dropout Regulator

  2. LDO Character • LDO stands for Low Drop-Out Regulator • Minimize the difference between the input and output voltage when it ceases to regulate • Provide a relatively simple and inexpensive power management solution

  3. LDO Block Diagram Vout = ((R2+R1)/R2) * Vref

  4. LDO Key Parameters • Dropout Voltage • Load Regulation • Line Regulation • Power Supply Rejection Ratio • Output voltage is controlled by the resistive negative feedback • Input voltage must be greater than the output voltage • Low quiescent current

  5. Low Drop-Out Voltage Regulator Composed of the following: • Voltage Reference • Pass Element • Error Amplifier • Feedback Resistors

  6. Provides a constant output voltage which will be compared with the output voltage from the feedback network Voltage Reference

  7. Error Amplifier Produces an error signal whenever the fed back sensed output differs from the reference voltage Feedback Network Produces the output voltage (voltage divider) Error Amplifier and Resistive Network

  8. PCMCIA Card Cellular Phones Camcorders Cameras DSL/Cable Modems MP3/CD Players LDO Application

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