LE40CD

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LE40CD is a general purpose, 5.0V fixed linear voltage regulator from ON Semiconductor. It is designed to provide up to 100mA of output current, and it provides excellent line and load regulation. Ambient temperature range from −40 °C to +125 °C ensures that the part can be used in various application conditions. The LE40CD has low noise design, making it suitable for audio applications. The low 110mV dropout voltage ensures that the part can provide good performance even at very low load currents.

LE40CD can be used in a variety of applications, including consumer electronics, industrial and automotive systems. The device is mainly used to regulate a power supply voltage to an allowed level, so that other adjacent circuits receive a proper voltage and current. The device can also be used as a high-speed transient suppressor, where it prevents higher voltage pulses, such as those caused by relay switch transitions, from affecting the performance of other components.

The LE40CD device is a monolithic three-terminal positive voltage regulator. Inside the chip, a series of bandgap voltage references and error amplifiers are combined with a single PMOS power transistor and some additional passives to create a complete and precise voltage regulator circuit. The feedback terminals (FB and REF) can be connected to a resistor divider network on the output, allowing the user to set the output voltage level.

The LE40CD device incorporates a precise series reference and an error amplifier to control the output voltage. At power-up, the device adjusts the gates of the control PMOS to maintain the output voltage at a constant level within the accuracy of the reference voltage (typical ±1.5%).

Under normal operation, the error amplifier turns the voltage across the sense resistor into an error voltage. Then the error voltage is compared with the reference voltage to adjust the PMOS gate to maintain the precise output voltage.

In the event of a sudden increase in the load current, the LE40CD quickly responds by increasing the PMOS gate voltage. This ensures that the output voltage remains constant and stable over a wide range of load conditions. This fast response makes the LE40CD ideal for applications which require a stable supply, even in the case of a sudden load change.

In summary, the LE40CD is a general purpose, 5.0V fixed linear voltage regulator. It can provide up to 100mA of output current, and offers excellent line and load regulation characteristics. The low dropout voltage and fast response make it suitable for applications that require a stable power supply, even when facing sudden load changes.

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