MAX8847/MAX8848 Backlight driv

maxim's latest backlight drivers uniquely combine a negative-charge-pump architecture with independent led switching to improve efficiency in portable devices.
backlight drivers increase led efficiency by 12% to extend battery life.
sunnyvale, ca—june 3, 2010—maxim integrated products (nasdaq: mxim) introduces the max8847/max8848, negative charge pumps for up to 6 or 7 white leds (wleds) in a 3mm x 3mm tqfn package. these backlight drivers employ a negative-charge-pump architecture to eliminate in-line resistance from the battery to wleds. as a result, mode switching from 1x to 1.5x is delayed during battery discharge, thereby minimizing dropout. the proprietary adaptive-mode-switching technology controls each led individually. the net result of this innovative technology is a 12% increase in led efficiency and, thus, longer battery life. this extra efficiency makes the max8847/max8848 well suited for cell phones, smartphones, digital still cameras, and other portable applications.
the max8847/max8848 can also replace the inductor-boost led drivers that consume a large piece of pcb real estate in conventional designs. a serial pulse/pwm interface controls each led, which enables multizone light management and allows up to 32 brightness levels. the low 120µa quiescent current facilitates always-on displays that require minimal power. high led current accuracy (±2%, max) ensures even brightness and minimizes power dissipation. built-in temperature derating and overvoltage protection further extend the life of the leds.
the max8847/max8848 are offered in a 3mm x 3mm, 16-pin tqfn package. pricing starts at $1.95 (1000-up, fob usa).
maxim integrated products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. the company was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. to date, it has developed over 6300 products serving the industrial, communications, consumer, and computing markets.