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TSMC reveals process tech for integrated LED drivers

Posted: 18 Dec 2009     Print Version  Bookmark and Share

Keywords:BCD process  LED driver  LCD 

Taiwan Semiconductor Manufacturing Company, Ltd. rolled out modular BCD (Bipolar, CMOS DMOS) process technologies designed for voltage integrated LED driver devices.

The new BCD technologies feature a voltage spectrum running from 12V to 60V to support multiple LED applications including LCD flat panel display backlighting, LED displays, general lighting and automotive lighting. The technology portfolio spans process nodes from 0.6µm to 0.18µm with a number of digital core modular options for varying digital control circuit gate densities. The CyberShuttle prototyping service supports the 0.25µm and 0.18µm processes for preliminary function verification.

The new processes provide a number of integration features that reduce a system's component counts. The robust high voltage DMOS capability provides MOSFET switch integration to reduce the BOM. The integrated passive component options include high voltage bipolar, high voltage, high precision capacitors, high resistance poly and Zener diodes to reduce external passive component count and significantly reduce circuit board area.

The DMOS process supports foundry's leading RDS(on) performance (i.e. 72mΩ/mm² at BV>80V for a specific 60V NLDMOS) and its high current driving capability optimises device sizes that enhance power efficiency. A robust safe operating area makes it suited for both power switch and driver design. Fine detailed characterisation also provides a useful reference to optimise the design budget for optimum chip size.

On the CMOS side, a 5V capability supports analogue pulse width modulation controller design elements and the 2.5V and 1.8V logic cores are optional modules for higher-level digital integration. Also, logic compatible one-time programmable and multi-time programmable memory options are available for enhanced digital programming design.

"The new BCD technologies for LED drivers are very leading edge in driving device integration. The associated PDKs feature highly accurate SPICE models that really enhance the potential for easy single chip design," points out George Liu, director for industrial business development. "Also, mismatching models help optimise current mismatching performance in multi-channel LED driver designs."

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