LD3980PU18R

Overview

The LD3980PU18R is a low-dropout linear regulator manufactured by STMicroelectronics, providing a fixed 1.8 V output with up to 300 mA load current capability. It operates within an input voltage range of 1.7 V to 3.6 V and features an ultra-low dropout voltage of 130 mV typical at full load. The device maintains very low quiescent current consumption, typically 110 µA at no load and maximum 0.5 µA in shutdown mode. It includes logic-controlled electronic shutdown, internal current limiting, and thermal overload protection. The component is housed in a compact 6-DFN (3x3 mm) surface-mount package.

Feature Summary

• Ultra-low dropout voltage operation for efficient power management in battery-powered systems
• Logic-controlled electronic shutdown function to minimize standby power consumption
• Compatible with small ceramic output capacitors for space-saving designs
• Integrated short-circuit and thermal overload protection mechanisms

Applications

• Mobile phones
• Personal digital assistants (PDAs)
• Cordless phones
• Battery powered wireless systems
• Portable information appliances

Procurement Notes

Verify the specific ordering suffix 'PU18R' against official STMicroelectronics documentation to confirm the exact output voltage, package type, and tape-and-reel specifications. Ensure compatibility with the required input voltage range and load current demands before procurement. Confirm that the component meets all necessary environmental and safety standards for the intended application environment.

Selection Notes

Select this regulator when designing low-power portable electronics requiring stable voltage regulation from a single-cell battery source. Consider its low quiescent current and high power supply rejection ratio for noise-sensitive applications. Evaluate the thermal performance and PCB layout requirements to ensure adequate heat dissipation within the specified operating temperature range.

Part Context

The LD3980 series belongs to STMicroelectronics' portfolio of low-dropout linear regulators designed for mobile and portable devices. This family emphasizes low power consumption and stability with ceramic capacitors. The LD3980PU18R specifically provides a regulated 1.8 V output, catering to digital logic and peripheral circuits commonly found in handheld consumer electronics.

Replacement Considerations

LD3980PM18R

FAQ

What is the minimum output capacitance required for stability?

The device is stable with ceramic output capacitors as low as 1 µF.

How does the shutdown feature affect power consumption?

Driving the SHDN pin low places the device in shutdown mode, reducing the supply current to typically 0.5 µA.