General Description

The MAX1889 provides the three regulated output voltages required for active matrix, thin-film transistor liquid crystal displays (TFT LCDs). It combines a high-performance step-up regulator with two linear-regulator controllers and multiple levels of protection circuitry for a complete power-supply system

Features

♦ High-Performance Step-Up Regulator

   Fast Transient Response

   Current-Mode Control Architecture

   Built-In High-Efficiency N-Channel Power MOSFET

   Current-Limit Comparator

   >85 Efficiency

   Selectable Switching Frequency

   (500kHz/1MHz)

Internal Soft-Start

♦ Positive Linear-Regulator Controller

♦ Negative Linear-Regulator Controller

♦ Triple-Level Protection Against Smoke or Fire

      Input Switch Replaces Input Fuse

      Output Overload Detection with Timer Latch

      Thermal Shutdown

♦ 2.7V to 5.5V Input Operating Range

♦ Ultra-Small External Components

♦ 1µA Shutdown Current (max)

♦ 1mA Quiescent Current (max)

♦ Ultra-Thin 16-Pin QFN Package (0.8mm Maximum Thickness)