LP3990QTLX-1.2Q1

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The LP3990QTLX-1.2Q1 is a fixed-output linear low-dropout (LDO) voltage regulator manufactured by Texas Instruments, designed for automotive applications under the AEC-Q100 qualification standard. It provides a fixed output voltage of 1.2V with a maximum continuous output current of 150mA. The device supports an input voltage range up to a maximum of 6V and features a typical dropout voltage of 0.2V at full load. Quiescent current is specified at 80µA, while maximum supply current reaches 120µA. Power supply rejection ratio (PSRR) ranges from 55dB to 35dB across frequencies of 1kHz to 10kHz. It operates within a temperature range of -40°C to 125°C and is housed in a compact 4-DSBGA (1x1) package.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Automotive-grade reliability certified to AEC-Q100 standards for robust performance in vehicle environments
• Integrated protection mechanisms including thermal shutdown and short-circuit current limiting
• Low quiescent current consumption optimized for battery-powered systems
• Enable control feature allowing precise power management and system state control

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Automotive infotainment systems requiring stable low-noise power rails
• Electronic control units (ECUs) needing reliable voltage regulation
• Sensor interface circuits in automotive safety systems
• Body electronics modules operating in harsh thermal conditions

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify that the part number suffix Q1 confirms AEC-Q100 automotive qualification status. Ensure the specific output voltage variant matches the design requirement of 1.2V. Confirm the package type is 4-DSBGA (1x1) for footprint compatibility. Check RoHS compliance documentation for environmental regulations. Validate supplier authenticity through authorized distribution channels to prevent counterfeit components.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when automotive certification is mandatory for the application. Choose this LDO if the load current does not exceed 150mA and input voltage remains below 6V. Consider the 4-DSBGA package constraints for PCB layout density. Evaluate thermal dissipation requirements based on the voltage drop and ambient temperature conditions. Compare PSRR specifications against noise sensitivity requirements of downstream circuitry.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This device belongs to the LP3990 family of low-power LDO regulators from Texas Instruments. The family includes various output voltage options and package types such as SOT-23-5 and DSBGA. The Q1 suffix denotes automotive grade qualification, distinguishing it from commercial variants like the LP3990TLX or LP3990MFX series which may lack extended temperature or reliability certifications required for automotive use.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

LP3990QTLX-1.5Q1: Same package and automotive grade but different fixed output voltage (1.5V). LP3990QTLX-2.8Q1: Same package and automotive grade but different fixed output voltage (2.8V). LP3990TLX-1.2/NOPB: Commercial grade version with same electrical specs and package but lacks AEC-Q100 certification.