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ON Semiconductor Introduces Low Power LED Driver Optimized for Coin Cell Powered Backlighting Applications

16th September 2010

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ON Semiconductor today introduced the CAT3661 - a new one-channel Quad-Mode™ LED Driver for ultra low power LED applications such as portable handheld medical equipment. “High efficiency and small size are often top of the agenda for designers of handheld electronics equipment,” said Anthony Russell, director of LED Power Products, ON Semiconductor. “The CAT3661 low power Quad-Mode LED driver utilizes patented technology to fully address these needs and supports customers in launching new battery powered product designs that meet the needs of end users by combining small form factor and long battery life.”

The CAT3661, which uses a patented architecture and integrates fault protection and fault diagnostics, is able to drive a single LED backlight with a current of up to 5 mA. Soft-start current limiting and short-circuit protection make the new device ideal for use in equipment powered by coin cell batteries. Typical applications include low power backlighting for LCDs and backlighting for a wide range of portable handheld devices including medical equipment.

Packaged in a 16-lead TQFN package measuring just 3 mm x 3 mm x 0.8 mm high, the CAT3661 provides a valuable solution for engineers working on new designs where available board space is limited. Space as well as overall system cost savings are further enhanced due to the fact that the low noise input ripple and constant switching frequency of the new device allow the use of small external ceramic capacitors. The quad-mode charge pump supports a wide range of input voltages from 2.0 V to 5.5 V and also helps the CAT3661 achieve peak efficiency levels of up to 92 percent - up to 10 percent higher than traditional high efficiency 1.5x tri-mode charge pumps. A typical quiescent current of just 150 µA across all operating modes at full load and a zero current shutdown help reduce power consumption and ensure that application battery life is maximized.