ZLDO1117K15TC Integrated Circuits (ICs)

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ZLDO1117K15TC Application Field and Working Principle

The ZLDO1117K15TC is a low dropout positive linear voltage regulator, belonging to the PMIC - Voltage Regulators - Linear category. It features a very low quiescent current, wide input voltage range and low output voltage noise. It is ideal for portable consumer products including but not limited to mobile phones, PDAs, digital cameras and portable music players.

The ZLDO1117K15TC is a low-power, low-voltage, bidirectional linear regulator. It provides a wide input voltage range from 4.5V to 16V and can deliver up to 150mA output current. It has an adjustable output voltage, varying from 1.2V to 13V, and is designed with a high-performance, thermal-balanced architecture that allows for a minimum dropout voltage of 135mV, which is low for this type of regulators.

This regulator also provides a low output noise of 40μVrms for a 1kHz frequency and plays an important role in the clean power supply of portable consumer electronics. It has a wide external bypass capacitor range of 1nF to 100µF that ensures stability and provides an optimal EMI rejection and low output noise.

To ensure safe operation, the ZLDO1117K15TC has a thermal protection and an over-current protection. It also features an auto-discharge and inrush current protection that prevents the regulator from inrush current surges, caused by the large capacitive inputs.

The ZLDO1117K15TC is a fully integrated, high-performance monolithic, easy to use and extremely compact solution for portable consumer electronics. It is available in SOT-25 package and has a wide temperature range from -40°C to +125°C.

Working Principle of the ZLDO1117K15TC

The ZLDO1117K15TC linear regulator works by using an internal P-channel and N-channel power MOSFET field-effect (FET) transistor. It uses two MOSFETs in a trans-conductance amplifier circuit to adjust the output voltage. The internal P-channel MOSFET operates as a diode to pass the input voltage to the output and the N-channel MOSFET limits the output voltage to the set level. The feedback voltage is compared to a band-gap reference voltage of 1.2V and the output voltage is regulated.

The P-channel MOSFET passes the input voltage to the output and is modulated by a trans-conductance amplifier. The trans-conductance amplifier circuit adjusts the gate voltage of the P-channel MOSFET according to the detected difference between the feedback voltage and the reference voltage, keeping the output voltage at the set level.

The ZLDO1117K15TC also has built-in protection mechanisms to ensure safe operation. It has a thermal protection circuit that shuts off the output when the die temperature exceeds 150°C. It also has an over-current protection circuit that limits the output current to a predetermined value if the sense voltage is greater than a certain level.

Conclusion

The ZLDO1117K15TC from PMIC - Voltage Regulators - Linear is an excellent solution for portable consumer electronics that require a low-power, low-dropout linear regulator. It is available in a very small package and features an input voltage range of 4.5-16V, adjustable output voltage range of 1.2-13V, a very low output noise of 40μVrms, an external bypass capacitor range of 1nF-100µF, and a wide temperature range of -40°C to +125°C. Moreover, it has a high-performance thermal-balanced architecture that ensures a minimum dropout voltage of 135mV.

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