Ultra slim SC442 can drive up to 120 white LED

Quasi and mixed signal semiconductor supplier Semtech Corporation (Semtech) recently released SC442, the company's first integrated 10 channel LED driver 3A boost power switch. This device uses ultra slim 4x4x0.6mm28 pin MLPQ package, can drive up to 120 led, current per channel up to 30mA. The utility model has the advantages of high density packaging, small external filter elements, wide working voltage range, and high efficiency, and meets the requirements of LED backlight LCD display with space constraints and LCD tv. High density LED driver is also very suitable for super bright display brightness higher than 500 Bennett, the display for medical, industrial, aviation and navigation market, as well as digital signage applications.

The device expands the SC44x series LED driver Suntech has spread, can be suitable for large LCD backlight applications. The input voltage range of SC442 is from 4.5V to 21V, which can be used in lithium ion batteries or 5V, 12V or 18V power supply. SC442 maximum output 42V, drive up to 12 white light per channel LED. Device compatible with boost or SEPIC (boost / Buck) topology. In addition, when the input voltage is greater than the output voltage, it can be seamlessly converted to bypass (or linear) mode. Its synchronization function can eliminate the intermodulation noise that occurs in a large number of LCD systems, such as the LED backlight, using a IC backlight. Other features include overheating, overload, LED open circuit protection, and LED short circuit protection.

Suntech company responsible for LED lighting and display the product marketing manager Steve Hawley said: "LCD system designers are seeking the visual area of the largest and brightest, reduce the impact on the casing size and heating of the system as much as possible. SC442 provides a high brightness, low loss and small size solution for the next generation of large format, high brightness LCD display. "

PWM dimming method up to 50kHz to eliminate the audio noise problem. The internal DC-DC current mode controller dynamically maintains optimal LED output voltage. For smaller panel designs, each channel can also be independently turned off. The driver provides LED open circuit protection, LED short circuit protection, and over temperature protection. The switching frequency of the controller can be set between 200kHz and 1MHz in order to get the best efficiency and L/C filter size.

SC442 LED driver using MLPQ-UT28 pin package, heat sink bottom exposed has a good thermal performance. SC442 is lead free halogen free products, fully meet the requirements of RoHS.

The main characteristics of SC442

Wide range of input voltage: 4.5V to 21V

Output voltage: up to 42V

* 10 channel LED driver

Maximum current per channel 30mA

Drive up to 120 white LED

Fully integrated built in 3A power switch

Efficiency of up to 91%

+ 1%LED current matching

Slim 4x4x0.6mm28 pin MLPQ package

SC442 joined Suntech existing LED backlight driver in the series, the series includes 6 channel SC440A, 4 channel and 3 channel SC441A/C, SC443 devices.