MAX1707

Light-Management IC with Efficient 1x/1.5x/2x Charge Pump for Backlight/Flash/RGB LEDs

High-Efficiency Backlight and Flash Driver with Up to 400mA Flash Capability and 3 RGB Drivers with a Programmable RGB Ramp for Main, Sub, RGB, Keypad, or Flash Applications in a Compact, 4mm x 4mm TQFN Package


Description

The MAX1707 provides complete light management for main display backlight, subdisplay backlight (or RGB indicator), and white LED camera flash with regulated constant current up to 610mA total. By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, it achieves high efficiency over the full 1-cell Li+ battery input voltage range. The 1MHz fixed-frequency switching allows for tiny external components while the regulation scheme is optimized to ensure low EMI and low input ripple. An integrated derating function protects the LEDs from overheating during high ambient temperatures.

The MAX1707 features an internally trimmed reference to set the maximum LED current. An I²C serial port is used for on/off control and setting the LED currents in 32 linear steps. When using the RGB indicator, the I²C port provides 32k colors and programmable rampup/down rates. The camera flash may be turned on/off by the I²C port or a separate digital logic input.
MAX1707: Typical Operating Circuit MAX1707: Typical Operating Circuit Enlarge+

Key Features

  • Guaranteed 610mA Continuous Drive Capability
    • 4 LEDs at 30mA Each for Main Display
    • 3 LEDs at 30mA Each for Sub or RGB
    • 400mA Total for Flash
  • 2-Wire I²C Serial Port
    • 5-Bit (32-Step) Linear Dimming
    • 32k Colors
    • Ramp-Up/Down Rates
  • 92% Peak/83% Avg Efficiency (PLED/PBATT)
  • Adaptive 1x/1.5x/2x Mode Switchover
  • 0.3% (typ) LED Current Accuracy and Matching
  • Low Input Ripple and EMI
  • Low 0.1µA Shutdown Current
  • Output Overvoltage Protection
  • Thermal Derating Function Protects LEDs
  • 24-Pin 4mm x 4mm Thin QFN Package

Applications/Uses

  • Cell Phones/Smartphones
  • Displays with Up to 11 LEDs
  • PDAs, Digital Cameras, Camcorders

MAX1707EVCMODU: Evaluation Kit/Evaluation System for the MAX1707
MAX1707EVKIT: Evaluation Kit/Evaluation System for the MAX1707

Quality and Environmental Data

Product Reliability Reports: MAX1707.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
 

Related Resources