Semtech’s 10-channel White LED Driver

Aug 13, 2010 Semtech Corp., a supplier of analog and mixed-signal semiconductors, announced the SC442, its first 10-channel white LED driver with an integrated 3A boost power switch. The device is capable of driving up to 120 LEDs at up to 30mA per channel and is packaged in an ultra-small, low-profile 4x4x0.6mm, 28-pin MLPQ package. The high-density package, small external filter components, wide operating voltage range and high efficiency satisfy space constrained LED backlights serving LCD monitors and LCD-TVs. The high density LED driver is also ideal for ultra-bright displays exceeding 500Nits which serve medical, industrial, avionics and navigation markets, as well as digital signage applications.

The SC442 operates across a wide input voltage range of 4.5V to 21V for use with lithium ion battery packs or regulated 5V, 12V or 18V power supplies. The SC442 is capable of up to 42V output for driving up to 12 white LEDs per channel. The device is compatible with boost (step-up), or SEPIC (step-up/down) topologies. It also transitions seamlessly to bypass (or linear) mode; when the input voltage is greater than the output voltage. The synchronization feature eliminates inter-modulation noise found in backlight systems utilizing multiple driver ICs - such as those found in large LED backlit LCD-TVs. Other features include over-temperature, overload, open and programmable short LED protection.

Up to 50kHz PWM dimming eliminates audio noise problems. The optimum LED output voltage is maintained dynamically by the internal DC-DC current mode controller. Channels can also be independently disabled for smaller panel designs. Open LED and programmable shorted LED protection as well as over-temperature are provided. The controller switching frequency is programmed from 200kHz to 1MHz to optimize efficiency and L/C filter sizing.

The SC442 is available immediately in production quantities and is priced at $3.10 each in 3,000-piece lots.

Author:  BIO T&T

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