LM2704MFX-ADJ

Overview

The LM2704MFX-ADJ is a micropower step-up DC/DC converter manufactured by Texas Instruments, designed primarily for LED driver applications. It operates within an input voltage range of 1.8V to 5.5V and delivers a regulated output suitable for backlighting up to 20V. The device features a peak switch current of 550mA and utilizes a fixed off-time control scheme to conserve operating current. Packaged in a small 5-lead SOT-23 (SC-74A) surface-mount format, it integrates current limiting and dimming capabilities. This component is classified as obsolete but remains documented for technical reference.

Feature Summary

• Integrates a boost converter topology with regulated output for consistent LED brightness
• Utilizes a fixed off-time control scheme to minimize quiescent current consumption
• Includes internal current limiting to protect the switch and connected load
• Supports external dimming control for adjustable light intensity management

Applications

• LED backlight drivers for portable electronic devices
• Step-up DC/DC conversion for low-voltage battery systems
• Current regulation for high-brightness LED arrays

Procurement Notes

Verify component authenticity carefully as this part is listed as obsolete. Confirm the specific suffix matches the required package and regulatory compliance status. Cross-reference the datasheet revision to ensure pinout compatibility with existing designs. Check for alternative replacement parts from the manufacturer if new production is required. Validate supplier credentials to avoid counterfeit components.

Selection Notes

Select this component when designing circuits requiring a compact solution for boosting low input voltages to drive LEDs. Consider the 550mA peak current limit when sizing the inductor and LED string. Evaluate the SOT-23-5 footprint constraints against available PCB space. Ensure the input voltage range aligns with the system's battery profile. Review thermal performance requirements given the small package size.

Part Context

This device belongs to the LM2704 family of micropower step-up converters. It shares functional similarities with the LM2704MF-ADJ variant, differing primarily in packaging. The series targets applications demanding minimal board area and low standby current. Other family members may offer different fixed output voltages or current limits.

Replacement Considerations

• LM2704MF-ADJ/NOPB

FAQ

What is the maximum peak switch current for the LM2704MFX-ADJ?

The device supports a peak switch current of 550mA.

Does the LM2704MFX-ADJ support external dimming?

Yes, the component includes functionality for external dimming control.