RT8023 Datasheet | Richtek

1.2MHz 1.5A Synchronous Step-Down Converter with Two LDOs General Description The RT8023 bines 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 Power Good pins for each regulator, it is easy to control the power up sequence, which is important in some applications. The LDO has an independent input and is capable of delivering up to 700m A(LDO1) and 350m A(LDO2) output currents with ultra-low dropout. The LDO has high PSRR and can work with low-ESR space saving ceramic capacitors. All these make it Ideal for portable RF and wireless applications with demanding performance and space requirements. Other Features include high output accuracy, current limiting protection, and 40μs fast turnon time. The step-down converter is a 1.2MHz PWM, current mode converter. Its high switching frequency allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal power switches with low on-resistance increase efficiency and eliminate the need for external Schottky diodes. The converter can run at 100% duty cycle for low dropout operation that extends battery life in portable systems. Features z Converter Input Voltage Range : 2.6V to 5.5V, LDO Input Voltage Range : 2.4V to 5.5V z Low-Noise LDO for RF Application z Ultra-Fast Response in Line/Load Transient z LDO Turn-On Time Less Than 40us z Only 1μF LDO Output Capacitor Required for Stability z Current Limiting Protection z 1.5A, High Efficiency Step-Down Converter z 1.2MHZ Constant Switching Frequency z Low RDS(ON) Internal Switches z No Schottky Diode Required z 0.8V Reference Allows Low Output Voltage z Low Dropout Operation : 100% Duty Cycle Internally pensated z < 2μA Shutdown Current z Power Good Output Voltage Monitor z Internal Soft-Start for PWM Converter z Easy Power Sequence Control z Over Temperature Protection z Short Circuit Protection z...