LF90CPT-TR

Overview

The LF90CPT-TR is a positive fixed low dropout (LDO) linear voltage regulator manufactured by STMicroelectronics. It provides a stable 9V output with a maximum current capacity of 0.5A. The device operates within an input voltage range up to 16V and features an inhibit function for power management. Key electrical specifications include ±2% output accuracy, a maximum quiescent current of 1.5mA, and line/load regulation of 45mV. Dropout voltage is specified at 0.35V at 200mA and 0.7V at 500mA. It is housed in a 5-pin PPAK package with thermal protection.

Feature Summary

• Integrated inhibit control function for efficient power management
• Low dropout performance ensuring stability under varying load conditions
• Built-in thermal protection mechanisms for enhanced reliability

Applications

• Battery-powered portable electronic devices requiring stable 9V supply
• Embedded systems utilizing microcontrollers or logic circuits
• Industrial control modules needing regulated voltage rails

Procurement Notes

Verify the component authenticity through authorized distributors due to reported counterfeit risks. Confirm the specific tape-and-reel packaging configuration matches your automated assembly requirements. Ensure the operating temperature range of -40°C to 125°C aligns with your system's environmental constraints. Cross-reference the 5-pin PPAK footprint dimensions with your PCB design files to guarantee mechanical compatibility.

Selection Notes

Select this regulator when a fixed 9V output is required with moderate current demands up to 500mA. Consider its low quiescent current for battery-operated applications where efficiency is critical. Evaluate the thermal resistance of 100°C/W junction-to-ambient for adequate heat dissipation in enclosed spaces. Compare against adjustable regulators if flexibility in output voltage is needed instead of a fixed rail.

Part Context

This component belongs to the LFXX series of very low drop voltage regulators from STMicroelectronics. The series is characterized by high precision and integrated safety features like inhibit controls. The LF90CPT-TR specifically targets applications requiring a reliable 9V source in compact form factors, leveraging the PPAK package for improved thermal performance compared to standard SOT packages.

Replacement Considerations

Direct substitutes within the same family include other LFxx series variants with different fixed output voltages but identical pinouts and functionality. Verify that any replacement maintains the 500mA current rating and 16V maximum input voltage limits. Ensure the substitute also supports the inhibit feature if power control is part of the design architecture.