BD4271HFP-CTR

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

The BD4271HFP-CTR is a fixed-output low-dropout (LDO) linear voltage regulator manufactured by ROHM Semiconductor. It provides a stable 5 V output with a maximum current capacity of 550 mA. The device supports an input voltage range from 5.5 V to 45 V and features a typical dropout voltage of 200 mV at 300 mA, with a maximum of 500 mV. It includes integrated protection mechanisms such as overcurrent protection, thermal shutdown, and under-voltage lockout. The component operates within a junction temperature range of -40 °C to +150 °C and meets AEC-Q100 automotive qualification standards.

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

• Integrated watchdog timer and reset signal generation with adjustable delay times via external capacitors
• Dedicated control pin for enabling or disabling the regulator output to minimize standby current consumption
• Comprehensive protection suite including overcurrent limiting, thermal shutdown, and under-voltage lockout

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

• Automotive electronic control units (ECUs)
• In-car navigation systems
• Automotive infotainment modules

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

Verify the specific suffix 'CTR' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the HRP-7 package dimensions align with the target PCB footprint and thermal management requirements. Ensure compatibility with the intended input voltage profile, noting the reduced current capability below 6 V input. Validate that the fixed 5 V output matches the downstream load specifications without requiring additional regulation stages.

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

Select this component when a robust automotive-grade LDO with built-in system monitoring is required. The inclusion of a programmable watchdog and reset function simplifies microcontroller supervision circuits. Consider the HRP-7 package for its thermal performance in space-constrained designs. Evaluate the 550 mA output limit against peak load demands, accounting for derating at higher temperatures. This part is suitable for applications prioritizing reliability and functional safety support over variable output configurations.

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

The BD4271 series belongs to ROHM's portfolio of high-voltage LDO regulators designed for automotive environments. It shares core electrical characteristics with variants like the BD4271FP2-CE2 but differs primarily in package type and thermal dissipation capabilities. The HRP-7 package offers a compact form factor compared to larger TO-263 options, making it distinct within the family for specific board layout constraints.

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

The BD3005HFP-TR is identified as a discontinued predecessor. Verify if the BD4271EFJ-CE2 serves as a functional alternative, noting its different HTSOP-J8 package and potentially different control feature set.