MAX1698 Datasheet | Maxim Integrated

Features o Over 90% Efficiency o Lossless, Adjustable LED Brightness o Space-Saving 10-Pin µMAX Package o Simpler, Lower Cost, More Reliable pared to CCFL or EL Backlights o Up to 5W Output Power General Description The MAX1698 is the most efficient driver for white or color LEDs. The device is ideal for LED backlit displays in PDAs and digital cameras, and can also be used for larger displays like those in laptop puters. Its numerous benefits include greater simplicity, lower cost, higher efficiency, longer bulb life, and greater reliability when pared to fluorescent (CCFL) and electroluminescent (EL) lamps. The MAX1698 is a switch-mode boost controller in which LED current, rather than output voltage, provides the feedback signal. It can operate with battery inputs as low as 0.8V. The device drives series-connected LEDs with a controlled current that is measured at a sense resistor connected at the feedback pin. The required sense resistor is typically 15Ω, not an expensive fractional-ohm value. LED current control and dimming are acplished with an adjust input (ADJ), not with lossy current-limiting resistors. For larger light output, multiple LED banks can be connected in parallel with up to 5W total output power. The MAX1698 is 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. Ordering Information PART MAX1698EUB TEMP. RANGE -40°C to +85°C PIN-PACKAGE 10 µMAX Pin Configuration TOP VIEW VCC 1 SHDN REF ADJ GND 2 3 4 5 10 EXT 9 CS PGND GND FB 8 7 6 Applications Battery-Powered Backlight Applications Backlight for LCD Panels Cell Phones Handy Terminals PDAs µMAX Typical Operating Circuit L VBATT D1 VOUT COUT VCC VCC EXT ON OFF SHDN REF ADJ CS PGND ILED FB GND RFB RN ________________________________________________________________ Maxim Integrated Products For free samples and the latest literature, visit .maxim-ic. or...