AP7350D-45CF4-7

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PMIC – Voltage Regulators – Linear – AP7350D-45CF4-7 Application Field and Working Principle

AP7350D-45CF4-7 is a linear voltage regulator that belongs to a series of low dropout (LDO) regulators manufactured by Diodes Incorporated. This linear regulator provides a cost-effective, integrated solution for a wide range of field applications with its ultra-low dropout voltage, low quiescent current and fast transient response characteristics.

Application Field

AP7350D-45CF4-7 is mainly used in industrial applications where power conversion is required. This voltage regulator works well in applications that require stable voltage supply, such as the power supply of sensors, low noise oscillators, gate drive power supplies, communication systems and PLCs, as well as a range of LED lighting applications.

Moreover, AP7350D-45CF4-7 can handle high current up to 2A and is packaged in a miniature SOT-23-5. The operating temperature range is -40°C to 125°C. These characteristics make AP7350D-45CF4-7 a great solution for automotive, medical and industrial applications with severe environmental constraints.

Working Principle

Similar to other linear regulators, AP7350D-45CF4-7 features the basic "Error Amp-Pass element" topology. It achieves fast transient response and low current consumption in regulating output voltage by using in-output voltage reference and an internally fixed band-gap reference. By adjusting the external resistors, the output voltage can be set from 0.2V to 32V. Inherent output over-voltage protection as well as external-polarity protection are also included in the circuitry.

When the input voltage falls below the output voltage, a current flows through the series Pass element (either a MOSFET or a bipolar transistor) which acts as a switch and maintains the output voltage. This is how AP7350D-45CF4-7 is able to stabilize the output voltage even when the input voltage is severely lower than the output.

AP7350D-45CF4-7 is designed with a low dropout circuit, which means the voltage regulator can be used with an input voltage lower than the typical assortment. Moreover, the ultra-low output voltage noise of AP7350D-45CF4-7 helps to minimize the ripple and transients in the output signal.

AP7350D-45CF4-7 also includes a thermal protection feature. The thermal cutoff has two states (ON and OFF) and operates based on die temperature sensing. In its “ON” state, the thermal protection closes the MOSFET Pass element to prevent the output voltage from further increasing due to any sudden input momentary high voltage. This helps to protect the output voltage from being destroyed due to the sudden input voltage changes.

In conclusion, AP7350D-45CF4-7 provides an efficient and cost-effective solution for a wide range of power management applications with its ultra-low voltage drop and fast transient response features. With its integrated features, it can handle a wide range of input voltages and current demands, making it a great choice for industrial, automotive, and medical applications.

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