LDQ40PU33R

Overview

The LDQ40PU33R is a fixed-output low-dropout linear regulator providing 3.3 V at up to 250 mA. It operates with an input voltage range of 3.3 V to 40 V and features a typical dropout voltage of 500 mV at full load. The device maintains output accuracy within ±0.5% at 25 °C and ±1.5% across the temperature range. It includes logic-controlled shutdown, power good indication, and protection against current limits, short circuits, and thermal overload.

Feature Summary

• AEC-Q100 Grade 1 qualified for automotive environments
• Logic-controlled electronic shutdown with ultra-low standby consumption
• Integrated Power Good open-drain output for system monitoring
• Comprehensive protection including current limit, short-circuit, and thermal shutdown

Applications

• EV powertrain systems
• Always-on battery-connected modules
• Infotainment and instrument clusters
• Advanced Driver Assistance Systems (ADAS)

Procurement Notes

Verify the specific package variant required for your design, as the LDQ40PU33R designation corresponds to the industrial DFN6 2x2 package. Automotive-grade versions utilize different suffixes such as RY and may feature wettable flanks or SOT23-5L packaging. Confirm that the component meets AEC-Q100 Grade 1 requirements if deploying in automotive applications. Ensure proper PCB layout guidelines are followed for thermal management and stability.

Selection Notes

Select this regulator for applications requiring high input voltage tolerance up to 40 V with minimal space utilization. The DFN6 2x2 package offers significant footprint reduction compared to traditional packages. Consider the adjustable version if non-standard voltages are needed. Verify that the external ceramic capacitors meet the ESR requirements for loop stability across the full operating temperature and load ranges.

Part Context

The LDQ40 series comprises high-accuracy LDO regulators designed for space-constrained designs. Available in DFN6 2x2 and SOT23-5L packages, the series supports both fixed and adjustable output configurations. The PU33R variant specifically provides a fixed 3.3 V output in the industrial DFN6 package, targeting general-purpose and automotive electronics requiring reliable regulation under wide input variations.

Replacement Considerations

Direct replacements include other LDQ40 variants with different output voltages or packages, such as LDQ40PU18RY or LDQ40M33RY. Cross-series replacements from other manufacturers require verification of pin compatibility, dropout characteristics, and thermal performance. Ensure any substitute meets the same AEC-Q100 Grade 1 qualification if used in automotive contexts.