DESCRIPTION The MP2143 is a monolithic， step-down， switchmode converter with internal power MOSFETs. It can achieve up to 3A continuous output current from a 2.5V–to-5.5V input voltage with excellent load and line regulation. The output voltage can be regulated as low as 0.6V. Constant-on-time control provides fast transient response and eases loop stabilization. Faultcondition protections include cycle-by-cycle current limiting and thermal shutdown. The MP2143 is available in small TSOT23-8 package and requires only a minimal number of readily-available standard external components. The MP2143 is ideal for a wide range of applications including high-performance DSPs， FPGAs， smartphones， portable instruments， and DVD drivers. FEATURES ? Wide 2.5V-to-5.5V Operating Input Range ? Output Voltage as Low as 0.6V ? 100% Duty Cycle in Dropout ? Up to 3A Output Current ? Low IQ： 40μA ? 80m? and 40m? Internal Power MOSFET Switches ? Default 1.2MHz Switching Frequency ? EN and Power-Good for Power Sequencing ? Cycle-by-Cycle Over-Current Protection ? Auto Discharge at Power Off ? Short-Circuit Protect with Hiccup Mode ? Stable with Low-ESR Output Ceramic Capacitors ? Available in a TSOT23-8 Package APPLICATIONS ? Low Voltage I/O System Power ? Handheld/Battery-powered Systems ? Wireless/Networking Cards