L4931ABD33

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The L4931ABD33 is a high-performance low-drop-out voltage regulator from STMicroelectronics. It features two outputs, low-power shutdown, fast start-up and low drop-out voltage. The device operates over a wide range of input voltages (1.4V – 20V) and draws typically 14 mA at full load.

The L4931ABD33 is classified as a Linear regulator, which is one of the several types of voltage regulators used to provide constant voltage output from a variable DC voltage source. It works by eliminating the peak-to-peak variations in the input voltage, thus keeping the voltage constant at the output.

The Linear Voltage Regulator such as the L4931ABD33 is simple, inexpensive and efficient, making it popular for a wide range of applications.

The L4931ABD33 is employed in power-constrained systems where it provides the highest efficiency while maintaining low battery current. The device is capable of providing sufficient power to ensure robust device operation.

It can be used in automotive, industrial and portable energy systems. It is particularly suitable for applications requiring low quiescent current, such as medical and industrial instrumentation, set-top boxes and other consumer audio/video applications.

The L4931ABD33 offers short-circuit protection and over-temperature protection. Its protection features prevent the device from damage due to overloads or thermal runaway.

The L4931ABD33 works on the principle of controlling the base current of an internal pass transistor. When the input voltage rises above the reference voltage of the device, the base current increases, causing the pass transistor to draw more current. This, in turn, increases the output voltage. Conversely, if the input voltage falls below the reference voltage, the pass transistor draws less current, reducing the output voltage.

The device features two output pins, each of which can provide an adjustable voltage between 0.8V and 20V. It also includes a ground-referenced output voltage divider feature. This feature helps to precisely control the output voltage by adjusting the resistor values.

In order to tune the output voltage, an external resistor divider could be connected to the module. This way, the design adjustments are done only in the hardware portion without the need to modify the software or firmware.

The L4931ABD33 has a high PSRR (power supply rejection ratio) of 74dB at 100kHz. This prevents high-frequency noise from the power source from disturbing the device’s output. It also has a very low ripple voltage of 10mVrms at full load.

The L4931ABD33 has an on/off switch feature that, when activated, disables the device in order to reduce the quiescent current to less than 1µA. It also features a wide operating temperature range from -40°C to +125°C.

In conclusion, the L4931ABD33 Linear voltage regulator is a versatile and reliable component for any application. Its low-power shutdown and fast start-up features make it ideal for multiple applications such as medical equipment, set-top boxes, consumer audio/video applications, automotive and industrial power systems, and many more.

The specific data is subject to PDF, and the above content is for reference