LP2975AIMMX-5.0/NOPB

Overview

The LP2975AIMMX-5.0/NOPB is a MOSFET LDO Driver/Controller manufactured by Texas Instruments, designed to facilitate high-current linear regulation using an external P-channel FET. It operates within a supply voltage range of 1.8V to 24V and features a fixed 5.0V output with 1.5% precision accuracy for the 'A' grade. The device includes low-power shutdown functionality consuming less than 1 µA, built-in current limit amplification, and overtemperature protection. It is housed in an ultra-small VSSOP-8 surface-mount package.

Feature Summary

• Enables simple design of high-current LDO regulators using minimal external components and an external P-FET.
• Provides precise output voltage regulation with low quiescent current consumption and high open-loop gain.
• Integrates low-power shutdown input and built-in current limit amplifier for robust system protection.

Applications

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

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the component is the LM2975AI variant which ensures the specified 1.5% output voltage accuracy. Ensure the external P-FET selection aligns with the controller's gate drive capabilities and voltage ratings.

Selection Notes

Select this controller when designing custom high-current linear regulators requiring precise voltage control. It is suitable for applications needing low dropout characteristics defined by the external FET's on-resistance. Consider the thermal requirements of the external pass element, as the controller manages regulation but relies on external components for power handling.

Part Context

This component belongs to the LP2975 family of MOSFET LDO controllers from Texas Instruments. It serves as the control logic for external power transistors, allowing designers to tailor output current and voltage specifications beyond standard fixed regulator limits while maintaining high efficiency and stability.

Replacement Considerations

LM2975AIMM-5.0/NOPB

FAQ

How is the dropout voltage determined in an LP2975 circuit?

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

What protection features are integrated into the LP2975?

The device includes overtemperature protection, a low-power shutdown input, and a built-in current limit amplifier for short-circuit protection.