SC443ULTRT

Overview

The SC443ULTRT is a three-channel white LED driver from Semtech, designed for backlight applications. It operates within an input voltage range of 4.5V to 27V and delivers up to 42V output. The device features an internal boost converter with a switching frequency of 1.2MHz (with some sources citing 800kHz) and provides a constant current output of 30mA per channel. Packaged in a 16-MLPQ-UT (3x3) surface-mount format, it supports PWM dimming and functions across a temperature range of -40°C to 85°C.

Feature Summary

• Integrates a high-efficiency boost DC-DC converter topology for driving multiple LED strings
• Supports precise PWM dimming control for backlight brightness adjustment
• Includes internal power switches to minimize external component count
• Designed specifically for mobile and portable device backlighting requirements

Applications

• Mobile phone LCD backlights
• Tablet display illumination
• Portable media player screens
• Smartphone camera flash systems

Procurement Notes

Verify the specific datasheet revision and electrical characteristics, as public records indicate conflicting switching frequency data (1.2 MHz vs 800 kHz). Confirm package marking and pinout compatibility with design layouts. Note that this component is listed as obsolete or end-of-life; ensure alternative sourcing strategies are in place for production continuity.

Selection Notes

Select this component when designing circuits requiring three independent LED channels driven by a single boost regulator. It is suitable for applications needing compact solutions with integrated switches. Consider the 16-MLPQ package size constraints and thermal dissipation requirements. Verify input voltage stability against the 4.5V minimum threshold during brown-out conditions.

Part Context

This part belongs to the SC443 series of LED drivers manufactured by Semtech Corporation. It is categorized under Power Management ICs (PMIC) specifically for LED lighting. The series targets consumer electronics markets where space efficiency and multi-string LED control are critical design factors.

Replacement Considerations

• SC443ULTRTCT
• SC443ULTRTDKR

FAQ

What is the maximum output voltage capability?

The device can generate an output voltage up to 42V to drive串联 LED strings.

Does the IC include internal power switches?

Yes, the SC443ULTRT integrates internal power switches, reducing the need for external MOSFETs.