LD39030ADTPU28R

Overview

The LD39030ADTPU28R is a fixed-output low-dropout linear regulator manufactured by STMicroelectronics. It provides a stable 2.8 V output with a maximum current of 300 mA. The device operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 330 mV at full load. Quiescent current is specified at 130 µA, with shutdown consumption below 0.1 µA when enabled. Output voltage tolerance is ±1.5%. Protection mechanisms include overcurrent limiting, thermal shutdown, and internal soft-start. It utilizes a 4-DFN (1x1 mm) surface-mount package and supports operation from -40 °C to +125 °C.

Feature Summary

• Ultra-low quiescent current consumption for extended battery life in portable devices
• Logic-controlled enable pin allows deep shutdown mode with negligible standby current
• Integrated protection circuits including constant current limiting and thermal overload shutdown
• Stabilized with small ceramic output capacitors, minimizing board space requirements

Applications

• Battery-powered consumer electronics requiring efficient power management
• Portable medical devices such as insulin pumps and glucose meters
• Smart home gateways and industrial sensors
• Activity trackers and GPS modules

Procurement Notes

Verify the suffix 'A' indicates the specific voltage tolerance variant. Confirm the 'DTPU' designation matches the required 4-DFN 1x1 package with exposed pad. Ensure the '28R' suffix corresponds to the fixed 2.8 V output voltage. Check RoHS compliance status against current regulatory requirements for your region before finalizing procurement.

Selection Notes

Select this component when a fixed 2.8 V rail is needed with minimal footprint. The high accuracy version suits applications sensitive to voltage drift. Consider the 300 mA limit for load requirements. The DFN4 package is suitable for dense PCB layouts. Verify input voltage stability remains within the 1.5 V to 5.5 V operational window during all operating conditions.

Part Context

This part belongs to the LD39030 series of ultra-low dropout regulators designed for space-constrained, battery-operated systems. The series emphasizes low noise and high power supply rejection ratio (PSRR). The 'A' variant offers tighter output voltage accuracy compared to standard versions, making it suitable for precision analog circuits or sensitive digital logic supplies.

Replacement Considerations

LD39030DTPU28R is listed as a similar alternative within the same family.