General Description
The MAX1578/MAX1579 provide four regulated outputs to meet all the voltage requirements for small activematrix TFT-LCD displays in handheld devices where minimum external components and high efficiency are required. Each device consists of three advanced charge pumps for LCD bias power and a step-up converter for driving up to 8 series white LEDs for backlighting. The input voltage range is from 2.7V to 5.5V.

FEATUREs
♦ Four Regulators in One Package
♦ Bias Power Using Charge Pumps
   +5V at 25mA for Source Driver
   +15V at 100µA for VON
   -10V at 100µA for VOFF
   No External Diodes Required
   Output Sequencing
   POS, NEG, and MAIN Are Autodischarged
      During Shutdown
♦ LED Backlight Power Using Boost Converter
   Series LED Connection for Uniform Illumination
   Supports Up to 8 LEDs at 25mA (max)
   900mW (max) Power
   PWM or Analog Dimming Control
   Overvoltage Protection
   Low Input/Output Ripple
   Soft-Start with Zero Inrush Current
   Fast 1MHz PWM Operation for Small
      Component Size
   Temperature Derating Function (MAX1579)
♦ High Efficiency
   Bias: 83% (5.0V at 25mA, 15V/-10V at 100µA)
   LED: 84% (6 LEDs at 20mA)
♦ Uses Only Ceramic Capacitors and Only One
   Inductor
♦ Independent Enable Inputs for LED and Bias
   Power
♦ Thermal-Shutdown Protection
♦ 1µA Shutdown Current
♦ Tiny 4mm x 4mm Thin QFN Package

APPLICATIONs
   PDAs, Palmtops
   Smart Phones
   Internet Appliances
   LCD Displays with
   White LED Backlight