LD49100PU15RY

Overview

The LD49100PU15RY is an automotive-grade low-dropout linear regulator providing a fixed 1.5 V output with a maximum current of 1 A. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 200 mV at full load. The device exhibits ultra-low quiescent current, consuming 20 µA at no load and 200 µA at 1 A load, with shutdown consumption below 1 µA. It includes a 1 ms internal soft-start circuit, power good indicator, and short-circuit/thermal protection. Qualified under AEC-Q100 Grade 1, it functions from -40 °C to +125 °C in a DFN6 (3x3 mm) package.

Feature Summary

• Automotive-grade reliability with AEC-Q100 Grade 1 qualification for operation between -40 °C and +125 °C
• Ultra-low quiescent current and noise performance suitable for sensitive analog loads without bypass capacitors
• Integrated logic-controlled enable function allowing deep shutdown with minimal standby current consumption
• Built-in protection mechanisms including thermal shutdown, constant current limiting, and precise power good monitoring

Applications

• Infotainment systems
• Digital instrument clusters
• Advanced Driver Assistance Systems (ADAS)
• Telematics control units
• Body electronics modules

Procurement Notes

Verify the specific ordering code LD49100PU15RY against the manufacturer's official datasheet DS13115 Rev 4 to confirm the fixed 1.5 V output configuration. Ensure compatibility with the required DFN6 (3x3 mm) footprint and wettable flank soldering process. Confirm that the application design meets the minimum ceramic capacitor requirements for stability.

Selection Notes

Select this component when a stable 1.5 V rail is required for automotive loads drawing up to 1 A. The low dropout characteristic allows efficient regulation from sources near the output voltage. Consider the integrated soft-start to manage inrush currents during system initialization. Verify that the PCB layout supports the thermal dissipation needs given the exposed pad connection.

Part Context

This part belongs to the LD49100 family of low-noise, low-quiescent-current LDOs designed specifically for automotive environments. The PU15 suffix denotes the fixed 1.5 V output variant, distinguishing it from adjustable versions or other fixed voltage options like 1.2 V or 2.5 V within the same series.

Replacement Considerations

Direct substitutes within the same family include LD49100PU12RY (1.2 V), LD49100PU18RY (1.8 V), and LD49100PURY (Adjustable). These share identical pinouts, packages, and electrical characteristics except for the output voltage setting.