BD3521FVM-TR

Overview

The BD3521FVM-TR is a single-channel series regulator driver IC manufactured by ROHM Semiconductor. It features an integrated N-channel MOSFET driver and Non Rush Current on Start up (NRCS) functionality. The device provides a fixed output voltage of 1.5V with ±1% accuracy. Recommended operating conditions specify a supply voltage (VCC) range of 4.5V to 5.5V and a drain voltage (VIN) range of 1.5V to 5.5V. The bias current is typically 0.85mA, while the shut down mode current is 10uA. The component operates within a temperature range of -10°C to +100°C and is housed in an MSOP-8 package.

Feature Summary

• Integrates an N-channel MOSFET driver for external power switching control.
• Includes NRCS function to prevent rush current during start-up sequences.
• Built-in thermal shutdown circuit protects against overheating damage.

Applications

• Power supply systems requiring controlled start-up ramping
• Applications utilizing external N-channel MOSFETs for voltage regulation

Procurement Notes

Verify the specific manufacturer part number BD3521FVM-TR against official ROHM documentation to confirm current availability status. Ensure that the MSOP-8 package dimensions and pinout configuration match the target PCB layout requirements. Confirm compliance with relevant environmental standards such as RoHS before finalizing procurement decisions.

Selection Notes

Select this component when a dedicated driver for an external N-channel MOSFET is required alongside precise voltage regulation. Consider the fixed 1.5V output capability and the necessity for non-rush current protection during system initialization. Evaluate the thermal dissipation characteristics relative to the expected load current and ambient operating temperatures.

Part Context

This component belongs to the BD3521FVM product series from ROHM Semiconductor. It functions as a specialized linear regulator driver rather than a standalone complete regulator, necessitating the use of an external power MOSFET. The design focuses on providing stable drive signals and protection features for high-current applications.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

FAQ

How does the NRCS function operate?

The NRCS function prevents rush current through the load during start-up by charging a capacitor on the NRCS pin, making the output voltage rise proportional to the reference voltage generated.

What happens if the internal temperature exceeds limits?

The built-in thermal shutdown circuit turns off all outputs to prevent damage. The IC latches in the off mode until the EN pin or UVLO is re-operated to release the latch.