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RT8023 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8023 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 19 page  RT8023 1 DS8023-03 March 2011 www.richtek.com Ordering Information Applications Portable Instruments Microprocessors and DSP Core Supplies Cellular Phones Wireless and DSL Modems PC Cards Digital Cameras 1.2MHz 1.5A Synchronous Step-Down Converter with Two LDOs 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 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 700mA(LDO1) and 350mA(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 40 μs fast turn- on 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 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 1 μμμμμF 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 < 2 μμμμμA 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 Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. Package Type QW : WQFN-24L 4x4 (W-Type) RT8023 Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) |
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