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)