BD4271EFJ-CE2

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The BD4271EFJ-CE2 is a fixed-output low-dropout (LDO) linear voltage regulator manufactured by ROHM Semiconductor. It provides a fixed output voltage of 5 V with a maximum output current capability of 550 mA. The device operates within an input voltage range of 5.5 V to 45 V and features a typical dropout voltage of 200 mV at 300 mA, with a maximum specified at 500 mV. Key electrical parameters include a quiescent current of 75 µA, ripple rejection of 60 dB at 120 Hz, and voltage regulation accuracy of ±2.0%. Protection circuits include thermal shutdown, over-current protection, and under-voltage lockout.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrated reset function and watchdog timer for system monitoring
• Control pin enables output shutdown to minimize power consumption
• Adjustable reset delay and watchdog timer via external capacitors

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Automotive electronic systems requiring functional safety support
• Microcontroller power supply units with reset requirements
• Battery-powered devices needing low standby current operation

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix CE2 against the official datasheet to confirm package type HTSOP-J8 and automotive qualification AEC-Q100. Ensure compatibility with required operating temperature ranges and control logic levels before integration into final designs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a high-voltage input LDO with integrated system supervision is required. The inclusion of a watchdog timer and reset function reduces external component count compared to standard LDOs. Verify that the 5 V fixed output aligns with target load requirements and that the 550 mA current rating suffices for peak loads.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the BD4271 series of high-voltage LDO regulators designed for automotive applications. The series emphasizes low quiescent current and integrated safety features. The EFJ package variant offers a compact surface-mount solution suitable for space-constrained PCB layouts in industrial and automotive environments.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Check for direct cross-references in ROHM's product change notices. Alternative packages like TO263-7 (BD4271FP2-CE2) offer similar electrical characteristics but require thermal management adjustments due to different heat dissipation profiles.