LD49150PT08R

Overview

The LD49150PT08R is a high-bandwidth, low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides an adjustable output voltage starting from 0.8 V with a maximum continuous output current of 1.5 A. The device operates with a main input supply range of 1.4 V to 5.5 V and requires a separate bias supply between 3 V and 6 V. Key electrical specifications include a maximum dropout voltage of 200 mV at full load, ±1.5% initial output voltage tolerance, and a typical quiescent current of 4 mA. It features logic-controlled shutdown, thermal shutdown, and current limit protection.

Feature Summary

• Dual supply configuration with separate main input (VIN) and bias input (VBIAS) ports for ultra-low dropout performance
• High bandwidth up to 10 MHz enabling fast transient response for demanding loads
• Logic-controlled enable pin for active-high on-off control and shutdown mode
• Integrated thermal shutdown and current limit protection mechanisms

Applications

• Microprocessor core voltage supply
• Graphics processors
• PC add-in cards
• Low voltage digital ICs
• SMPS post regulators

Procurement Notes

Verify the component status as production data indicates potential obsolescence or lifecycle changes. Confirm that the PPAK package variant matches the required PCB footprint and thermal dissipation capabilities. Ensure the bias supply circuitry meets the minimum 3 V requirement distinct from the main input rail. Validate environmental compliance against specific project standards.

Selection Notes

Select this regulator when powering low-power microprocessors requiring fast transient response and minimal dropout voltage. The dual-supply architecture allows operation from very low input voltages, provided a separate bias source is available. Consider the PPAK package for its thermal performance using PCB copper planes as heatsinks. Ensure output capacitance selection aligns with stability requirements for ceramic capacitors.

Part Context

The LD49150PT08R belongs to the LD49150 family of 1.5 A ultra low-dropout voltage regulators. This family includes fixed output variants such as LD49150PT10R and LD49150PT12R, alongside adjustable versions like the PT08R. All variants share the same high-bandwidth architecture and dual-supply design principles within the PPAK surface-mount package.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.