SC620ULTRT

Overview

The SC620ULTRT is an octal LED driver IC from the Semtech SC6 series, designed for multi-channel lighting applications. It features a boost topology with eight independent constant current sinks, each capable of delivering up to 25 mA. The device operates on a supply voltage range of 2.7 V to 5.5 V and supports an adjustable switching frequency up to 400 kHz. It utilizes I2C control for configuration and includes an adjustable global current gain register allowing step sizes from 31.25 μA to 500 μA. Packaged in an MLPQ-UT-16 surface-mount format, it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Eight independently controlled constant current sinks allow flexible LED configuration and individual channel enable/disable capabilities.
• I2C interface enables digital control over device settings, including global current gain adjustment for precise dimming and variation compensation.
• Boost topology supports driving LEDs with varying forward voltages by connecting anodes to the system power supply.

Applications

• Multi-colored and white LED arrays requiring independent channel control
• Portable electronic devices utilizing surface-mount LED backlighting
• General-purpose LED illumination systems with I2C management requirements

Procurement Notes

Verify component authenticity through authorized Semtech distributors or certified partners. Confirm the MLPQ-UT-16 package marking and reel specifications match official datasheet standards. Check for recent Product Change Notifications (PCN) regarding manufacturing site updates or material changes. Ensure storage conditions comply with moisture sensitivity levels specified in the data sheet to prevent soldering defects during assembly.

Selection Notes

Select this component when designing circuits requiring eight distinct LED channels with uniform current regulation. The boost topology is suitable for applications where LED forward voltage exceeds the minimum supply voltage. Consider the 25 mA per channel limit and the 400 kHz maximum switching frequency when evaluating thermal performance and electromagnetic interference constraints. The I2C control interface is essential for systems requiring dynamic brightness adjustment or status monitoring.

Part Context

The SC620ULTRT belongs to the Semtech SC6 family of LED drivers, which are optimized for portable electronics and compact lighting solutions. This specific part number denotes the tape-and-reel packaging variant of the SC620 device. The SC6 series is characterized by its high integration, low quiescent current, and flexible output configurations, making it a standard choice for modern mobile and consumer hardware designs.

Replacement Considerations

Consult factory availability for direct substitutes as indicated in related documentation. Verify pin compatibility and electrical parameters against alternative octal LED drivers if cross-referencing other manufacturers' components.

FAQ

How is the output current for each channel adjusted?

The output current is set via an adjustable global current gain setting register, allowing step sizes ranging from 31.25 μA to 500 μA, with a maximum output of 25 mA at the highest setting.

What control interface does the SC620ULTRT use?

The device uses an I2C control interface for configuring registers, enabling/disabling channels, and adjusting current settings.

Can different types of LEDs be driven simultaneously?

Yes, the driver supports multi-colored and white LEDs with different forward voltages, provided they are connected with anodes to the system power supply and cathodes to the respective current sink pins.