Driver IC powers up to eight white LEDs in series

22 February 2006 Power Electronics / Power Management

Toshiba Electronics Europe has expanded its constant-current white LED driver product line with a compact DC/DC converter IC for powering multisegment white LEDs used to backlight new, larger colour LCD panels in small portable devices such as cellphones and PDAs.

The high-precision, high-performance TB62752AFUG white LED driver IC, supplied in a SOT23-6 package, allows designers to save space and reduce component count by using a single device to drive from two to eight LEDs in series. High output power allows for up to 800 mW LED loading, while built-in protection functionality including a dedicated surge-detection pin further minimises the need for external components.

Suitable for use with portable designs based on Li-ion batteries, the device operates with input voltages from 2,8 V to 5,5 V and achieves high power efficiency in excess of 80% during seven-segment white LED operation. Current precision is guaranteed to within ±5% to ensure uniform LED lighting. Surge detection voltage is rated at 37 V.

Integrated protection functionality is designed to accommodate open and shorted LED failure modes without additional components.

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