TPS73218QDCQRQ1

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

The TPS73218QDCQRQ1 is an automotive-grade, cap-free NMOS low-dropout (LDO) linear voltage regulator from Texas Instruments. It provides a fixed 1.8 V output with a maximum load current of 250 mA and operates within an input voltage range of 1.7 V to 5.5 V. The device features ultra-low dropout voltage, reverse current protection, and thermal shutdown. It is qualified under AEC-Q100 standards for Grade 1, supporting ambient operating temperatures from -40°C to +125°C. The component is housed in a DCQ (SOT-223) package.

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

• NMOS pass element topology enables stable operation without mandatory output capacitors.
• Inherent reverse current blocking prevents backflow when the enable pin is deactivated.
• Low noise architecture suitable for powering sensitive analog circuitry such as VCOs.
• Integrated thermal shutdown and foldback current limit protect against overload conditions.

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

• Post-regulation for switching power supplies
• Noise-sensitive circuitry requiring clean power rails
• Portable electronic devices utilizing low quiescent current

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

Verify that the specific ordering suffix QDCQ corresponds to the SOT-223 package variant required for your PCB footprint. Confirm the 'RQ1' designation aligns with your automotive qualification requirements. Ensure the fixed 1.8 V output matches your system voltage specifications before finalizing procurement.

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

Select this component when a fixed 1.8 V rail is needed with minimal external components. The absence of output capacitor requirements simplifies board layout. Verify that the input voltage remains above the minimum threshold of 1.7 V and consider the thermal dissipation capabilities of the SOT-223 package under maximum load conditions.

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

This part belongs to the TPS732xx-Q1 family of low-dropout regulators designed for automotive applications. The family utilizes an advanced BiCMOS process to achieve high precision and low ground pin current. The TPS73218 variant specifically sets the internal reference to deliver a fixed 1.8 V output, distinguishing it from other adjustable or fixed-voltage versions in the series.

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

TPS73218DBVRQ1

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

Does the TPS73218QDCQRQ1 require an output capacitor for stability?

No, the device is designed to be stable without an output capacitor due to its NMOS pass element topology, though capacitors may be added to improve transient response or noise performance.

How does the device handle reverse current flow?

The NMOS pass element provides inherent reverse current blocking. To ensure complete charge removal from the gate, the enable pin must be driven low before the input voltage is removed.