L4936N

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The L4936N is a low drop voltage regulator (LDVR) from STMicroelectronics that is generally used to power devices from 2.9V to 5V. The regulator is able to provide up to 2A of current, making it ideal for a variety of applications. It is available in two versions; the L4936N-D and the L4936N-E, which have different maximum output voltages. The typical voltage drop across the regulator is 0.55V. The L4936N is a three-terminal adjustable linear regulator, with the ground pin being the input and the output pin being the output.

The L4936N provides better dynamic performance than Bipolar Regulated Voltage Regulators. Thanks to its high performance and low-power consumption, the L4936N can be employed in a wide range of applications, such as:

1. Laptops and handheld devices
2. Industrial equipment and medical equipment
3. Portable consumer devices
4. Sensors and controllers
5. Telecommunication circuits

At a minimum, the L4936N requires two external capacitors of suitable values for operation. A 1µF ceramic capacitor should be connected between the output pins (Vout and GND). The other capacitor should be an electrolytic type with values from 10µF to 100µF. The electrolytic capacitor should be connected between the power supply pin (Vin) and Ground (GND). This capacitor prevents high frequency ripple from entering the device, minimizing the peak-to-peak noise at the output. To ensure proper thermal performance, the device must be placed on a heat sink.

The operating principle of the L4936N is based on linear voltage regulation. This type of regulator compares the reference voltage, VREF, with the output voltage, VOUT, and adjusts its output accordingly through a series of feedback loops. The reference voltage is usually set externally by a resistive voltage divider network. During normal operation, the L4936N adjusts its output voltage so that it is equal to the reference voltage. When the output voltage is higher or lower than the reference voltage, the voltage regulator will increase or decrease its output voltage to bring the output voltage back to the reference voltage.

In addition to its linear voltage regulation, the L4936N also has internal overload protection circuitry. This circuitry monitors the input current of the device and, if the current exceeds the set current limit, the device will immediately shut down to prevent damage to the circuit. The current limit can be adjusted by changing the value of a resistor connected to the Output Select pin.

Overall, the L4936N is a versatile and reliable Linear Voltage Regulator. With its wide range of features and applications, the L4936N is a great choice for powering a wide range of electronic devices. It is capable of providing excellent regulation performance while consuming minimal power, making it ideal for portable and low-power applications.

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