LM3668QDNTRQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LM3668QDNTRQ1 is a 1-A high-efficiency dual-mode single-inductor buck-boost DC-DC converter designed for automotive applications. It operates with an input voltage range of 2.5 V to 5.5 V and provides adjustable output voltages, typically configured for 4.5 V or 5 V rails. The device features a maximum switching frequency of 2.2 MHz and supports surface-mount packaging in a 12-WSON (WDFN) exposed pad configuration. It functions within an operating temperature range of -40°C to +125°C, ensuring reliability in harsh environments.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Dual-mode operation optimizes efficiency across varying load conditions by switching between pulse-width modulation and pulse-frequency modulation.
• Single-inductor topology reduces component count and board space requirements compared to multi-inductor solutions.
• Automotive-grade qualification ensures robust performance and longevity in demanding vehicle electrical systems.

Voltage Regulators - DC DC Switching Regulators Applications

• Infotainment system power distribution
• Instrument cluster voltage regulation
• Body control module power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'Q' indicates AEC-Q100 automotive qualification status against the official Texas Instruments datasheet. Confirm the 'RQ1' designation matches the required reel quantity and tape-and-reel specifications for your assembly line. Ensure the 12-WSON package dimensions align with your PCB footprint design rules before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing for automotive environments requiring wide input voltage tolerance from battery rails. The dual-mode capability makes it suitable for applications with significant load current variations. Verify that the 1-A output current meets the peak demands of the downstream circuitry while maintaining thermal limits within the specified junction temperature range.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3668 family of synchronous buck-boost converters. While the standard LM3668SD-4550EV serves as an evaluation tool for the non-automotive variant, the QDNTRQ1 model is specifically engineered for mass production in automotive electronics. It shares core architectural similarities but differs in qualification standards and operational temperature ranges.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitutes include other AEC-Q100 qualified buck-boost regulators from Texas Instruments such as the TPS6380x series. Cross-reference pinouts and thermal characteristics carefully, as package variations may require PCB redesign. Always validate functional equivalence using official manufacturer comparison tools rather than generic industry assumptions.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum switching frequency of the LM3668QDNTRQ1?

The device supports a fixed switching frequency of 2.2 MHz.

Does the LM3668QDNTRQ1 support adjustable output voltage?

Yes, the output voltage is programmable via external resistors, commonly set for 4.5 V or 5 V outputs.