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MAX1698, MAX1698A：High-Efficiency Step-Up Current Regulator for LEDs

The MAX1698 and MAX1698A are efficient drivers for white or color LEDs. They are ideal for large LED backlit displays in PDAs and laptop computers. Numerous benefits include greater simplicity, lower cost, higher efficiency, longer bulb life, and greater reliability when compared to fluorescent (CCFL) and electroluminescent (EL) lamps. The MAX1698/MAX1698A are switch-mode boost controllers in which LED current, rather than output voltage, is regulated The devices drive series-connected LEDs with a controlled current that is measured with a typically 15Ω sense resistor, not an expensive fractional-ohm value. LED current control and dimming are accomplished with an adjust input (ADJ). For larger light output, multiple LED banks can be connected in parallel with up to 5W total output power. The MAX1698A has a higher, and more accurately specified, CS current limit than the MAX1698 for higherpower applications of 5W or more. Both devices are supplied in a space-saving 10-pin µMAX package that occupies half the space of an 8-pin SO. An evaluation kit (MAX1698EVKIT) is available to speed designs.

Key Features Over 90% Efficiency Lossless, Adjustable LED Brightness Space-Saving 10-Pin µMAX Package Simpler, Lower Cost, More Reliable Compared to CCFL or EL Backlights Up to 5W Output Power

MAX1698, MAX1698A: Typical Operating Circuit Applications/Uses Backlight for LCD Panels Battery-Powered Backlight Applications Cell Phones Handy Terminals PDAs

DataSheet

Parametrics

Design kits & evaluation modules

• MAX1698EVKIT

Quality and Environmental Data

• MAX1698.pdf

Ordering Information