LP2975IMM-5.0

Overview

The LP2975IMM-5.0 is a MOSFET LDO Driver/Controller manufactured by Texas Instruments, housed in an 8-Lead VSSOP surface mount package. It provides a standard output voltage of 5.0V with a precision accuracy of 1.5% for the 'A' grade. The device operates within a supply voltage range of 1.8V to 24V and supports a junction temperature range from -40°C to +125°C. Key electrical characteristics include a typical quiescent current of 180 µA at VIN = 5V, a shutdown current of less than 1 µA, and a built-in current limit detection threshold of 57 mV.

Feature Summary

• Provides precise regulation using a trimmed internal bandgap reference
• Features low-power shutdown input for energy conservation
• Includes built-in current limit amplifier and overtemperature protection
• Supports user-selectable dropout voltage via external P-FET sizing

Applications

• High-current 5V to 3.3V regulator designs
• Post regulator for switching converters
• Current-limited switch applications

Procurement Notes

Verify the specific suffix indicates the intended grade and packaging configuration. Confirm that the component matches the required thermal and electrical specifications for the target application environment. Ensure compatibility with the selected external P-channel MOSFET regarding gate drive requirements and breakdown voltage ratings.

Selection Notes

Select this controller when designing high-current linear regulators requiring minimal external components. Consider the trade-off between external FET selection and dropout voltage performance. Evaluate the need for external current limiting resistors based on short-circuit protection requirements and power dissipation limits of the chosen pass transistor.

Part Context

This component belongs to the LP2975 family of LDO controllers designed to simplify the creation of high-performance linear regulators. Unlike integrated LDOs, this controller requires an external P-FET, allowing designers to optimize for specific current and voltage levels. It serves as a flexible solution for custom power management architectures where standard fixed-output regulators are insufficient.

Replacement Considerations

LP2975IMM-3.3/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 controls the device state; applying a voltage above the threshold turns the output on, while a lower voltage activates the low-power shutdown mode.