LP2975AIMM-12/NOPB

Overview

The LP2975AIMM-12/NOPB is a MOSFET LDO Driver/Controller manufactured by Texas Instruments. It operates within an input supply voltage range of +1.8V to +24V and supports a junction temperature range from -40°C to +125°C. The device features a typical quiescent current of 180 µA at VIN = 5V and includes a low-power shutdown input with less than 1 µA consumption. It utilizes an 8-lead VSSOP surface-mount package.

Feature Summary

• Provides high open-loop gain for excellent regulation and ripple rejection performance
• Features built-in overtemperature protection and current limit amplifier
• Enables user-selectable dropout voltage through external FET sizing
• Includes a low-power shutdown input for efficient power management

Applications

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

Procurement Notes

Verify the specific 'A' grade accuracy requirements against datasheet specifications, as this variant offers tighter output voltage tolerances compared to standard grades. Confirm that 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 high-current linear regulators requiring minimal external components. Ensure the chosen external P-FET meets the required breakdown voltage and on-resistance specifications to achieve desired dropout characteristics. Consider the available VSSOP-8 package size constraints during PCB layout planning.

Part Context

This part belongs to the LP2975 family of MOSFET LDO controllers designed to simplify high-current regulator design. Unlike integrated LDOs, this controller requires an external P-channel MOSFET to handle the load current, allowing for flexible voltage and current configurations while maintaining low quiescent current operation.

Replacement Considerations

LP2975AIMM-5.0/NOPB

FAQ

How is the dropout voltage determined in an LP2975 design?

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

What is the function of the sense resistor in the LP2975 circuit?

A sense resistor placed in series with VIN implements overcurrent protection by utilizing the controller's 57 mV detection threshold to limit the short-circuit current.