LM3668SDX-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3668SDX-3.3/NOPB is a synchronous buck-boost DC/DC converter manufactured by Texas Instruments, designed for single-cell lithium-ion or lithium-polymer battery applications. It operates within an input voltage range of 2.5 V to 5.5 V and provides a fixed output voltage of 3.3 V with a maximum continuous output current of 1 A. The device integrates a 2.2 MHz switching frequency to minimize external component size while maintaining high efficiency across varying load conditions. It features a low quiescent current of 45 µA in shutdown mode and supports operation from -40°C to +85°C. Packaged in a compact 12-WSON (3x3 mm) footprint, it offers a robust solution for portable electronics requiring efficient power management.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Dual-mode operation automatically switches between PWM and PFM modes to optimize efficiency at both light and heavy loads.
• Integrated synchronous rectification reduces external component count and improves conversion efficiency compared to asynchronous designs.
• Single-inductor topology simplifies board layout and minimizes the overall solution size for space-constrained applications.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable devices powered by single-cell lithium-ion or lithium-polymer batteries
• Smartphones and mobile communication equipment
• Personal digital assistants (PDAs) and handheld gaming consoles
• Medical instrumentation requiring stable regulated power from battery sources

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix '3.3' confirms the fixed 3.3 V output variant, as the LM3668 family includes programmable and other fixed voltage options. Confirm RoHS compliance status via the manufacturer's datasheet, as environmental declarations may vary by production batch. Ensure the WSON-12 package thermal characteristics are adequate for your specific PCB copper area and ambient temperature conditions. Check for obsolescence notices, as this component series may have limited new design recommendations.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a fixed 3.3 V output is required from a single-cell battery source ranging from discharged to fully charged states. The 1 A current capability suits moderate load applications, while the 2.2 MHz frequency allows for small inductors. Consider the 12-WSON package for tight space constraints. If higher output currents or adjustable voltages are needed, evaluate alternative regulators within the PMIC portfolio. Verify that the input voltage range covers your minimum battery discharge voltage.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM3668 family of high-efficiency buck-boost converters from Texas Instruments. Similar parts include the LM3668SD-2833/NOPB (fixed 2.8 V/3.3 V output) and LM3668SD-4550/NOPB (fixed 4.5 V/5 V output). These variants share the same core architecture, package, and electrical characteristics but differ in their fixed output voltage settings. The family is designed for portable consumer electronics where battery life and board space are critical factors.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers for the LM3668SDX-3.3/NOPB are not available in the provided documentation. Users should consult Texas Instruments directly for current replacement recommendations or equivalent products within the PMIC portfolio.