MAX8647 Datasheet | Maxim Integrated

Description The MAX8647/MAX8648 drive up to six white LEDs or two sets of RGB LEDs with regulated constant current for display backlight and fun light applications. By utilizing an inverting charge pump and extremely lowdropout adaptive current regulators, these ICs achieve very high efficiency over the full 1-cell Li+ battery voltage range and even with large LED forward voltage mismatch. The 1MHz fixed-frequency switching allows for tiny external ponents. The regulation scheme is optimized to ensure low EMI and low input ripple. The MAX8647/MAX8648 include thermal shutdown, openand short-circuit protection. The MAX8647 features an I 2C serial port, while the MAX8648 features a three-wire serial-pulse logic interface. Both devices support independent on/off and dimming for main and subbacklights. The dimming ranges are pseudo-logarithmic from 24m A to 0.1m A and off in 32 steps. Both devices include a temperature derating function to safely allow bright 24m A full-scale output current setting while automatically reducing current to protect LEDs at high ambient temperatures above +60°C. The MAX8647/MAX8648 are available in a 16-pin, 3mm x 3mm thin QFN package (0.8mm max height). - - - - - - - - - - KIT ATION EVALU E L B AVAILA Features Six Adaptive Current Regulators Independent Voltage Supply for Each LED Individual LED Brightness Control (MAX8647) 24m A to 0.1m A Dimming Range I2C Interface (MAX8647) Serial-Pulse Dimming Logic (MAX8648) ±2% Accuracy, ±0.4% Matching (typ) Low 70µA Quiescent Current Low 1µA Shutdown Current Inrush Current Limit TA Derating Function Protects LEDs 16-Pin, 3mm x 3mm Thin QFN Package MAX8647/MAX8648 Ordering Information PART DIMMING PIN PACKAGE TOP MARK AFD AFE PKG CODE T1633-5 T1633-5 MAX8647ETE+ I2C interface 16 Thin QFN-EP- MAX8648ETE+ Serial-pulse 16 Thin QFN-EP- logic Applications White LED Backlighting, Single or Dual Display Wide-Gamut RGB LED Display Backlighting Camera Flash or RGB Indicators .. Cellular Phones and...