L4938EPD

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L4938EPD Voltage Regulator

The L4938EPD is a low drop-out (LDO) three-terminal linear regulator. It offers a wide range of adjustable output voltage, from 0.7V up to 5.5V, with a maximum output current of 500mA. Furthermore, it incorporates few components, thus making it an ideal solution for supplying microcontrollers and other low-power applications. The linear regulator is a popular choice for designs requiring low voltage, low heat dissipation and small footprint.

L4938EPD Application Field

The L4938EPD is an excellent solution for applications that require low voltage levels and low power consumption. Some typical applications of this device include, but not limited to:

• Battery operated systems
• Computer and office equipment
• Battery and charger circuits
• Portable communication systems
• Low noise power supply sections

L4938EPD Working Principle

The L4938EPD works on a linear regulation principle, where the output voltage is directly proportional to the input voltage. That is, when a load is connected to the output, the voltage drop caused by the load can be compensated by increasing or decreasing the input voltage. The device functions as a regulated source of constant voltage, despite changes at the input voltage or load conditions.

The device works by controlling the current flowing through a pass transistor, between the output and the ground. The pass transistor is connected with a reference voltage source and is controlled by a control circuit. The control circuit uses an Error Amplifier to detect the difference between the output voltage (Vout) and the reference voltage (Vref) and adjusts the current of the pass transistor accordingly. This in turn adjusts the output voltage, so that it maintains a constant level.

The L4938EPD is designed such that it can provide up to 500mA current. It is also designed to be very efficient, consuming very low power to minimize power losses. Furthermore, the device is protected against short circuit, over-voltage and current overload conditions, adding to its reliability.

Conclusion

The STMicroelectronics L4938EPD is a reliable, low drop-out three-terminal linear regulator. It offers a wide range of adjustable output voltage, from 0.7V up to 5.5V with a maximum output current of 500mA. It is suitable for applications that require reliability, low noise and high efficiency. This makes the L4938EPD an ideal solution for low power applications and battery-operated devices.

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