LM3678SDX-1.2/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3678SDX-1.2/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments, featuring an integrated 1.5A power switch and operating within a VSON-10 package. This device delivers a fixed 1.2V output voltage with high efficiency across varying load conditions. It supports an input voltage range from 2.7V to 5.5V and operates at a switching frequency of 2MHz. The component functions reliably within a temperature range of -40°C to +85°C, incorporating internal compensation and protection features such as overcurrent limiting and thermal shutdown for robust performance in space-constrained applications.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a synchronous rectifier architecture to maximize conversion efficiency and minimize external component count.
• Utilizes a fixed 2MHz switching frequency to enable the use of small inductors and capacitors for compact board layouts.
• Incorporates automatic transition between Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) modes to optimize light-load efficiency while maintaining regulation under heavy loads.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable battery-powered consumer electronics requiring efficient voltage regulation
• Embedded systems utilizing single-cell lithium-ion or lithium-polymer batteries
• Mobile communication devices and handheld instruments

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'SDX' corresponds to the tape-and-reel packaging configuration when sourcing. Confirm RoHS compliance status through official manufacturer documentation, as environmental declarations may vary by production batch. Ensure the ordering part number matches the exact electrical specifications required for your design, particularly the fixed 1.2V output variant.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing circuits that require a compact solution for stepping down 3.7V lithium battery voltages to 1.2V logic levels. The 2MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the thermal performance of the VSON-10 package relative to the expected current load and ambient temperature constraints of the final enclosure.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3678 family of SIMPLE SWITCHER® converters, designed for high-efficiency power management in portable applications. The LM3678 series integrates the control circuitry, driver, and power switches into a single monolithic IC, simplifying the design process for engineers developing compact, battery-operated electronic systems.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with alternative regulators based on pinout, electrical parameters, and package dimensions before substitution.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum output current capability of the LM3678SDX-1.2/NOPB?

The device is rated for a continuous output current of 1.5A.

Does the LM3678 support adjustable output voltages?

No, the LM3678SDX-1.2/NOPB variant provides a fixed 1.2V output. Adjustable versions exist within the broader LM3678 family but require different part numbers.