LP2975AIMM-5.0/NOPB

Overview

The LP2975AIMM-5.0/NOPB is a MOSFET LDO Driver/Controller manufactured by Texas Instruments in an 8-lead VSSOP surface-mount package. It provides a fixed 5.0V output with a precision of ±1.5% at 25°C. The device operates within a supply voltage range of 1.8V to 24V and supports junction temperatures from -40°C to +125°C. Typical quiescent current is 180 µA at VIN = 5V, dropping below 1 µA during shutdown. Key electrical parameters include a 57 mV current limit sense threshold and a gate drive sourcing current of 3.5 mA.

Feature Summary

• Integrates high open-loop gain for excellent regulation and ripple rejection performance
• Features user-selectable dropout voltage determined by external P-FET sizing
• Includes built-in overcurrent protection and overtemperature shutdown mechanisms

Applications

• High-current 5V to 3.3V regulator designs
• Post-regulator stages for switching converters
• Current-limited power distribution systems

Procurement Notes

Verify the specific 'A' grade designation ensures the required 1.5% output voltage accuracy. Confirm the VSSOP-8 package dimensions match the PCB footprint requirements. Ensure the external P-FET selection aligns with the controller's gate drive capabilities and thermal dissipation needs for the target application environment.

Selection Notes

Select this component when designing custom high-current linear regulators using external P-channel MOSFETs. It is suitable for applications requiring low quiescent current and precise voltage regulation. Consider the external component count and thermal management requirements for the chosen FET when evaluating system efficiency and size constraints.

Part Context

This part belongs to the LP2975 family of LDO controllers produced by Texas Instruments. It functions as a driver for external power transistors rather than a standalone regulator. The 'A' suffix indicates tighter manufacturing tolerances compared to standard grades, while the '/NOPB' denotes lead-free and RoHS compliance.

Replacement Considerations

LP2975IMM-5.0/NOPB (Standard Grade)

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 1.5V turns the output on, while 0V initiates a low-power shutdown mode consuming less than 1 µA.