STLED25JR

Overview

The STLED25JR is a fixed frequency, high efficiency boost DC-DC converter featuring five parallel high-side current sources. It delivers up to 125 mA total LED current with a maximum channel voltage of 7.5 V. The step-up output voltage automatically adjusts to 100 mV above the highest required driver voltage. Operating from an input range of 2.3 V to 5.5 V, it maintains efficiency above 85% at light or full load and close to 87% at medium load. Key specifications include 2.5 MHz switching frequency, ±7.5% LED current accuracy, and PWM dimming support.

Feature Summary

• Integrates five parallel high-side linear current sources for single or dual LED connections per channel
• Implements self-test failure detection to disable faulty channels while maintaining normal operation of others
• Includes soft-start control, inrush current limit, thermal shutdown, and inductor peak current limit

Applications

• Backlighting systems requiring multiple parallel LED channels
• Portable devices utilizing high-efficiency boost conversion for LED drivers
• Applications necessitating automatic fault isolation to prevent thermal issues

Procurement Notes

Verify the specific suffix 'JR' against official STMicroelectronics documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with the required 12-bump CSP footprint dimensions (1.4 x 1.8 mm) during PCB layout. Confirm that the selected variant meets all electrical parameters defined in the datasheet for your specific application requirements.

Selection Notes

Select this component when designing circuits requiring five independent high-side LED channels driven by a single boost converter. It is suitable for applications needing automatic output voltage regulation relative to the highest channel demand. Consider its 2.5 MHz switching frequency for compact inductor sizing and its self-test feature for enhanced system reliability in critical lighting applications.

Part Context

The STLED25 belongs to a family of integrated LED driver solutions designed for high efficiency and compact form factors. It combines power management and linear regulation functions into a single 12-bump CSP package. This integration reduces external component count compared to discrete boost and linear regulator combinations, simplifying design for multi-channel LED backlighting.

FAQ

How does the device handle LED failures?

The device implements a self-test feature to detect LED failures. Upon detection, it disables the related channel to avoid excessive power consumption or thermal issues, while allowing other functioning channels to continue operating normally.

What is the switching frequency of the STLED25?

The device operates at a fixed switching frequency of 2.5 MHz.