LD49150PT12R

Overview

The LD49150PT12R is a 1.5 A ultra low-dropout voltage regulator with a fixed 1.2 V output, manufactured by STMicroelectronics. It operates within an input voltage range of 1.4 V to 5.5 V and requires a bias supply between 3 V and 6 V. The device features ±1.5% initial tolerance, a maximum dropout voltage of 200 mV at full load, and fast transient response up to 10 MHz bandwidth. It includes logic-controlled shutdown, thermal shutdown, and current limit protection, functioning reliably from -25 °C to 125 °C junction temperature.

Feature Summary

• Dual supply configuration with separate main input and bias ports for ultra-low dropout performance
• High-bandwidth design ensuring fast transient response suitable for sensitive digital loads
• Integrated logic-controlled shutdown option alongside thermal and current limit protections

Applications

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

Procurement Notes

Verify the specific ordering suffix 'PT' corresponds to the PPAK package variant when sourcing. Confirm that the required bias supply voltage meets the minimum 3 V threshold for proper operation. Ensure application circuits include appropriate ceramic capacitors on both input and bias pins to maintain stability and optimal transient response characteristics.

Selection Notes

Select this component for applications requiring high current delivery with minimal voltage drop across the regulator. The dual-supply architecture allows operation from very low input voltages while maintaining regulation. Consider the PPAK package's thermal dissipation capabilities relative to the expected power loss and ambient operating conditions.

Part Context

This part belongs to the LD49150 series of high-bandwidth, low-dropout linear regulators designed for powering low-power microprocessors. The series offers both adjustable and fixed output voltage options in PPAK and DFN6 packages, providing flexibility for various board space and thermal management requirements in portable and industrial electronics.

Replacement Considerations

LD49150PU12R (DFN6 package equivalent)

FAQ

What is the function of the VBIAS pin?

The VBIAS pin supplies power to the internal control circuitry and requires a voltage between 3 V and 6 V, which must be at least 2.1 V above the output voltage.

How does the enable feature work?

The EN pin provides logic-controlled shutdown; applying a high signal enables the regulator, while a low signal shuts it down to minimize ground pin current.