General Description

The RT8023 combines two low dropout (LDO) linear regulators and a step-down converter with an input voltage range of 2.6V to 5.5V. Each output voltage is adjustable from 0.8V to 5V. With independent Enable and PowerGood pins for each regulator, it is easy to control the power up sequence, which is important in some applications.

Features

● Converter Input Voltage Range : 2.6V to 5.5V, LDO Input Voltage Range : 2.4V to 5.5V

● Low-Noise LDO for RF Application

● Ultra-Fast Response in Line/Load Transient

● LDO Turn-On Time Less Than 40us

● Only 1μF LDO Output Capacitor Required for Stability

● Current Limiting Protection

● 1.5A, High Efficiency Step-Down Converter

● 1.2MHZ Constant Switching Frequency

● Low RDS(ON) Internal Switches

● No Schottky Diode Required

● 0.8V Reference Allows Low Output Voltage

● Low Dropout Operation : 100 Duty Cycle Internally Compensated

● < 2μA Shutdown Current

● Power Good Output Voltage Monitor

● Internal Soft-Start for PWM Converter

● Easy Power Sequence Control

● Over Temperature Protection

● Short Circuit Protection

● Thermally Enhanced 24-Lead WQFN Package

● RoHS Compliant and 100 Lead (Pb)-Free

Applications

● Portable Instruments

● Microprocessors and DSP Core Supplies

● Cellular Phones

● Wireless and DSL Modems

● PC Cards

● Digital Cameras