LM3668SD-4550/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3668SD-4550/NOPB is a synchronous buck-boost DC/DC converter from Texas Instruments, designed for single-inductor applications. It operates within an input voltage range of 2.5 V to 5.5 V and provides a fixed output voltage of 4.5 V or 5 V with a maximum output current of 1 A. The device integrates a 2.2 MHz switching frequency and maintains a low quiescent current of 45 uA. It supports shutdown functionality and functions reliably across an operating temperature range of -40°C to +85°C. The component is housed in a compact WSON-12 package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates synchronous rectification for high efficiency in buck-boost topologies
• Supports dual-mode operation for optimized performance across load conditions
• Features programmable soft-start and precise current limit protection
• Includes enable pin for remote system power control

Voltage Regulators - DC DC Switching Regulators Applications

• Portable battery-powered devices requiring stable voltage regulation
• Single-cell lithium-ion battery systems with varying input levels
• Industrial sensor nodes needing efficient step-up and step-down conversion
• IoT modules operating under fluctuating supply conditions

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the NRND status before integration, as this indicates the component is not recommended for new designs. Confirm RoHS compliance details via official datasheets. Ensure the WSON-12 package footprint matches your PCB layout requirements. Check for specific ordering suffixes if alternative variants are considered. Validate thermal performance within the specified -40°C to +85°C range for your application environment.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a single-inductor solution is preferred for space-constrained designs. It is suitable for applications requiring both buck and boost capabilities from a single source. Consider the 2.2 MHz frequency for smaller external components. Evaluate the 45 uA quiescent current against standby power requirements. Compare against other LM3668 variants if different fixed output voltages like 3.3 V are needed.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM3668 series of single-inductor dual-output or single-output converters. It shares architectural similarities with other parts in the family but differs in fixed output voltage settings. The series targets portable electronics where board space and efficiency are critical. Other variants include models with different fixed outputs such as 3.3 V or 3.0 V.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes within the same family include LM3668SD-3034/NOPB and LM3668SD-2833/NOPB, which offer different fixed output voltages. Verify pin compatibility and electrical specifications before substitution. No other direct cross-model replacements are documented.