LP2975IMMX-5.0

Overview

The LP2975IMMX-5.0 is a MOSFET LDO Driver/Controller manufactured by Texas Instruments, designed to facilitate high-current low-dropout regulator designs using an external P-channel FET. It operates within a supply voltage range of 1.8V to 24V and features a typical quiescent current of 180 µA at VIN = 5V. The device provides a standard output voltage setting of 5.0V with a precision accuracy of 1.5% for the 'A' grade. It includes built-in overtemperature protection and a current limit amplifier with a 57 mV detection threshold. The component is housed in an ultra-small VSSOP-8 surface mount package and supports junction temperatures from -40°C to +125°C.

Feature Summary

• Ultra-small VSSOP-8 package design
• Low-power shutdown input capability
• Built-in current limit amplifier
• Overtemperature protection

Applications

• High-current 5V to 3.3V Regulator
• Post Regulator for Switching Converter
• Current-limited Switch

Procurement Notes

Verify the specific suffix 'X' against official documentation to confirm tape-and-reel packaging status. Ensure the 'A' grade designation is present if 1.5% precision is required, as standard grades offer 2.5% accuracy. Confirm the manufacturer is Texas Instruments or its authorized successor National Semiconductor. Check for RoHS compliance markings on the datasheet revision history.

Selection Notes

Select this controller when designing custom high-current linear regulators requiring minimal external components. It is suitable for applications needing precise voltage regulation with low dropout characteristics determined by the external FET selection. Consider thermal management requirements for the external pass element based on the calculated power dissipation.

Part Context

This component belongs to the LP2975 family of LDO controllers. Variants include different fixed output voltages such as 3.3V and 12V, as well as adjustable versions. The 'IMM' indicates the VSSOP-8 package, while the '-5.0' specifies the internal reference voltage setting. The 'X' suffix typically denotes reel-based packaging for automated assembly.

Replacement Considerations

LP2975IMM-5.0/NOPB

FAQ

How is the dropout voltage determined?

The dropout voltage is user-selectable and depends on the RDS(ON) of the external P-FET multiplied by the maximum load current.

What is the function of the ON/OFF pin?

The ON/OFF pin allows for low-power shutdown control, enabling the device to be turned off with a threshold voltage that supports various logic levels.