LD1117DT33

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LD1117DT33 Application Field and Working Principle

LD1117DT33 belongs to the PMIC – Voltage Regulators – Linear family. It is a three-terminal adjustable regulator with an output voltage range between 1.2V and 37V. With its low dropout and low quiescent current, it is very suitable for battery-powered applications.

Features of LD1117DT33

• Input voltage range up to 40V
• Low dropout voltage of 0.7V
• Low quiescent current of 300µA
• Adjustable output voltage between 1.2V and 37V
• Output current up to 1A
• High power dissipation of 4.4W
• Frequency response up to 1MHz
• Over-temperature protection
• Short-circuit protection
• Thermal shutdown

Applications of LD1117DT33

LD1117DT33 is suitable for a variety of applications, including battery-powered systems, microprocessors, digital logic supplies, and personal computers. It is also well suited for automotive systems, instrumentation, medical equipment, and consumer electronics.

Working Principle of LD1117DT33

LD1117DT33 features an on-chip bandgap reference and output transistor. The bandgap reference provides a temperature compensated voltage reference. The output transistor amplifies and regulates the reference voltage to maintain the output voltage steady even if the supply voltage or the load current varies.

The output voltage of LD1117DT33 is regulated by a resistor divider between the input voltage and the output voltage. The reference voltage is applied to the sensing resistor, which then regulates the output voltage. When the reference voltage increases, the output voltage decreases, and vice versa.

The LD1117DT33 also features short-circuit protection, over-temperature protection, and thermal shutdown. If the output current exceeds its maximum limit, the device will shut down to protect itself and the connected load from being damaged.

Conclusion

LD1117DT33 is a three-terminal adjustable regulator. With its wide input voltage and output current range, low dropout voltage, and low quiescent current, it is very suitable for battery-powered applications. Its features include over-temperature protection, short-circuit protection, and thermal shutdown. It is suitable for a variety of applications, such as automotive systems, instrumentation, medical equipment, and consumer electronics.

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