LP2975AIMMX-3.3

Overview

The LP2975AIMMX-3.3 is a MOSFET LDO Driver/Controller manufactured by Texas Instruments in an 8-lead VSSOP package. It provides a precision 3.3V output with 1.5% accuracy at 25°C. The device operates within a supply voltage range of 1.8V to 24V and features a typical quiescent current of 180µA at 5V input. Key electrical parameters include a 57mV current limit sense threshold, 5000 V/V open-loop gain, and a junction temperature range of -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 ordering suffix against the manufacturer's official documentation to confirm pinout compatibility and thermal characteristics. Ensure that external component selection aligns with the controller's gate drive limits and stability requirements. Confirm RoHS compliance status through the latest datasheet revision notes before finalizing procurement specifications.

Selection Notes

Select this controller when designing high-current linear regulators using external P-channel MOSFETs. The fixed 3.3V output eliminates the need for external feedback resistors for standard applications. Consider the low quiescent current and wide input voltage range for battery-powered or variable supply systems requiring precise regulation.

Part Context

This component belongs to the LP2975 family of MOSFET LDO drivers/controllers from Texas Instruments. It is designed to simplify the creation of high-performance linear regulators by offloading control functions to an external power FET. The 'AI' grade designation indicates tighter output voltage tolerance compared to standard industrial grades.

Replacement Considerations

LP2975AIMM-3.3/NOPB

FAQ

How is the dropout voltage determined for this controller?

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 activates the low-power shutdown mode.