MAX8648

Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN

Achieves Industry's Highest Efficiency Using the Industry's First Negative Charge Pump Driving Six White/RGB LEDs Independently


Please check latest availability status for a specific part variant.

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 low-dropout 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 components. The regulation scheme is optimized to ensure low EMI and low input ripple. The MAX8647/MAX8648 include thermal shutdown, open- and short-circuit protection.

The MAX8647 features an I²C 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 24mA to 0.1mA and off in 32 steps. Both devices include a temperature derating function to safely allow bright 24mA 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).

MAX8647, MAX8648: Typical Operating Circuit MAX8647, MAX8648: Typical Operating Circuit Enlarge+

Key Features

  • Six Adaptive Current Regulators
  • Independent Voltage Supply for Each LED
  • Individual LED Brightness Control (MAX8647)
  • 24mA to 0.1mA 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

Applications/Uses

  • Camera Flash or RGB Indicators
  • Cellular Phones and Smartphones
  • PDAs, Digital Cameras, and Camcorders
  • White LED Backlighting, Single or Dual Display
  • Wide-Gamut RGB LED Display Backlighting
Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
Dimming RatioDimming ControlPOUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
maxmaxminmaxmaxmaxSee Notes
MAX8647 1-Cell Li+Charge Pump66Parallel0.024240I2C Serial0.62.75.50.151000
THIN QFN/16
$2.17 @1k
MAX8648 Serial Pulse0.2
THIN QFN/16
$1.89 @1k
See All LED Drivers (76)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX8648EVKIT: MAX8648 Evaluation Kit

Technical Documents

App Note 4187 Negative Charge Pumps Achieve Inductor-Like Efficiency for WLED Backlights

Quality and Environmental Data

Request Reliability Report for: MAX8648 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX8648

CAD Symbols and Footprints

  • MAX8648ETE+
  • MAX8648ETE+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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