GENERAL DESCRIPTION
Current mode operation provides fast transient response and eases of loop stabilization. Internal soft-start minimizes the inrush supply current at startup. In shutdown mode, the regulator reduces the current less than 1µA of supply current. This device is available in SOP-8/PP ,DFN-8 package with exposed pad for low thermal resistance. n Typical Application L VIN 2.2µH 5V IN SW CIN 10µF C2 Optional EN OFF ON AME5287 C1 680pF R3 25KΩ COMP GND FB FREQ RFREQ 18KΩ R1 75KΩ R2 24KΩ VOUT 3.3V COUT 22µF Figure 1. 3.3V at 3A Step-Down Regulators. n FEATURES
l 3A Output Current l Stable with Low ESR Output Ceramic Capacitors l Pre-Regulator for Linear Regulators l Up to 95% Efficiency l Less than 1µA Shutdown Current l Wide Switching Frequency Range from 300KHz~2MHz l Thermal Protection l Cycle-by-Cycle Over Current Protection l Output Adjustable from 0.8V to VIN l Short Circuit Protection l Green Products Meet RoHS Standards VIN 3V~5V CIN 10µF C2 Optional L 1.5µH IN SW EN OFF ON AME5287 R1 6KΩ C1 680pF R3 8.2KΩ COMP FB GND FREQ RFREQ 18KΩ R2 24KΩ VOUT 1V COUT 22µF Figure 2.
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