BD10KA5WFP-E2

BD10KA5WFP-E2 application field and working principle

The BD10KA5WFP-E2 is a 1.5A low dropout (LDO) linear voltage regulator integrated circuit (IC) from ROHM Semiconductor. It is a low-cost and low-power regulator for low-voltage power supplies. The regulator operates from a wide range of input voltages ranging from 2.0V to 12V, making it suitable for battery-powered applications, such as portable medical devices, MP3 players, remote controls, wireless microphones and so on. It has an exceptionally low supply current when compared to other regulators, and it includes an EN signal pin and capability for overcurrent protection.

The BD10KA5WFP-E2 features an ultra low-dropout voltage of 125mV and a high-frequency current mode control which help reduce supply ripple. The shutdown current and power up/down time are both very low, ensuring that the regulator is optimized for battery-powered applications. The regulator is fully protected against burn out due to short-circuit CAD or ESD, and has built-in thermal shutdown protection. The device also features a low-noise operation with the addition of a β- compensation pin.

The BD10KA5WFP-E2 is an ideal solution for low-voltage and low-power applications which do not require high current, such as MP3 players, remote controllers and other portable devices. The low-dropout voltage, low-supply current, and robust protection make it a highly reliable and cost-effective solution for these applications. This device is a good choice for current-sensitive applications, as the high-frequency current mode regulation provides excellent input bypass performance.

This regulator consists of two main blocks, the error amplifier and the linear output stage. The error amplifier is composed of an NPN and PNP transistor pair, which regulates the voltage at the output by comparing the reference voltage and the feedback voltage at the output and adjusting the collector current as needed. The output stage consists of a PNP transistor, Zener diode, and diode-connected transistor, with the output voltage being regulated by controlling the current through the PNP transistor. The NPN transistor further helps in maintaining the stability of the output voltage.

In summary, the BD10KA5WFP-E2 is a cost-effective, high-performance linear low-dropout regulator IC suitable for low-voltage and low-power applications. It features a wide range of input voltages, an ultra-low dropout voltage, and low noise operation. The built-in protection and robust design make it an ideal choice for battery-powered applications.