BD3925HFP-CTR

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Voltage regulator is one of the most important part in power supply circuit, especially for mobile applications. And the BD3925HFP-CTR is a typical linear voltage regulator series from Rohm, meeting the AEC-Q100 standard and support the load dump, reverse load protection, input overvoltage protection, output overvoltage protection and thermal shut-down in the package size of 4.5 mm x 4.40 mm x 0.9 mm. The BD3925HFP-CTR has a low dropout voltage and quiescent current, so it is ideal for the mobile applications.

The BD3925HFP-CTR can provide 0.8V － 5.0V output voltage, which satisfies the mobile application needs. In addition, the BD3925HFP-CTR can reach low dropout and offers high current output. It can reach upto 24 mA of available output power at 3.3V, 24 mA at 5V and 1A at 1.5V. Therefore, it can provide more flexibility for the power supply design, especially for mobile applications.

In the application field, the BD3925HFP-CTR has a wide range of applications, from mobile phones and PDAs to traffic information systems. In the mobile phone, the BD3925HFP-CTR can provide a stable power supply for the charging and other applications. In the PDAs, the BD3925HFP-CTR can provide stable power supply for the LCD display, camera module and other components. In the traffic information systems, the BD3925HFP-CTR can be used to power the traffic signals and other related components.

The working principle of BD3925HFP-CTR is fairly simple, it uses a negative feedback loop to regulate the output voltage by comparing the output voltage with the reference voltage. The loop consists of error amplifier, control transistor and external components. The control transistor is usually a P-channel or N-channel MOSFET. The voltage applied to the gate of the MOSFET will determine the output voltage. If the output voltage is higher than the reference voltage, the feedback loop will reduce the gate voltage and make the MOSFET to decrease the output voltage, which will lead to a overall lower output voltage. This way, the BD3925HFP-CTR is able to maintain a stable output voltage.

In summary, BD3925HFP-CTR from Rohm is a low dropout and quiescent linear voltage regulator, which can provide a stable and well regulated output voltage for the mobile application. The BD3925HFP-CTR can maintain a output voltage from 0.8v to 5V, and the high current output can reach up to 1A to support the mobile application system. The feedback loop of the BD3925HFP-CTR use error amplifier and control transistor to adjust the output voltage to provide stable performance. With its low power consumption, small size and AEC-Q100 compliant, the BD3925HFP-CTR is a ideal solution for mobile applications.

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