SC442ULTRT

Overview

The SC442ULTRT is a 10-channel, high-efficiency integrated step-up (boost) LED driver IC designed to power up to 120 white LEDs. It features a wide input voltage range of 4.5 V to 21 V and supports output voltages up to 42 V without requiring an internal regulator or bypass capacitor. Each channel provides a programmable current sink of up to 30 mA with a channel-to-channel current matching accuracy of +/-1%. The device integrates a 3 A switch and operates at a programmable switching frequency between 500 kHz and 1 MHz. It accepts PWM dimming signals up to 50 kHz, achieving a dimming ratio greater than 500:1. The component is housed in an MLPQ-28 package.

Feature Summary

• Integrates ten independent current sink channels for multi-string LED configurations
• Supports flexible LED arrangements by allowing parallel operation of channels for increased current
• Includes protection mechanisms that disable only affected channels upon detecting open or shorted LEDs
• Enables precise brightness control through high-frequency PWM dimming with excellent linearity

Applications

• Backlighting for medium to large LCD displays
• Automotive LCD backlight systems
• Desktop monitor backlighting
• Notebook computer display illumination
• Portable television backlighting

Procurement Notes

Verify the specific suffix 'U' against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with the required operating temperature range and input voltage constraints before integration. Cross-reference the latest datasheet revision to confirm pinout integrity and electrical characteristics match the design requirements.

Selection Notes

Select this component when designing systems requiring multiple LED strings driven from a single boost converter topology. The wide input voltage range accommodates various battery configurations. Consider the 500 kHz to 1 MHz switching frequency range to optimize external inductor and capacitor sizing based on efficiency versus size tradeoffs. Verify that the 30 mA per channel limit meets the total luminous flux requirements of the target application.

Part Context

This part belongs to the Semtech SC44 series of high-efficiency integrated LED drivers. These devices are engineered specifically for applications demanding high brightness uniformity across numerous LED channels. The series utilizes advanced boost converter technology to maximize energy efficiency, which is critical for extending battery life in portable electronic devices and reducing thermal load in compact display modules.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.