A5268

A5268 3A, 28V, 340KHz Synchronous Rectified Step-Down Converter n General Description n Features The A5268 is a fixed frequency monolithic synchronous buck regulator that accepts input voltage from 4.75V to 28V. Two NMOS switches with low on-resistance are integrated on the die. Current mode topology is used for fast transient response and good loop stability. Shutdown mode reduces the input supply current to less than 1µA. An adjustable soft-start prevents inrush current at turn-on. This device is available in SOP-8/PP package with exposed pad for low thermal resistance. n Applications l Distributed Power System l Networking System l FPGA, DSP, ASIC Power Supplies l Notebook Computers l 3A Output Current l Wide 4.75V to 28V Operating Input Range l Integrated Power MOSFET Switches l Output Adjustable from 0.925V to 25V l Up to 95% Efficiency l Programmable Soft Start l Stable with Low ESR Ceramic Output Capacitors l Cycle-by Cycle Over Current Protection l Fixed 340KHz Frequency l Input Under Voltage Lockout l System Protected by Over-current Limiting, Over-voltage Protection and Thermal Shut- down l Thermally Enhanced SOP-8/PP Package l Green Products Meet RoHS Standards C n Typical Application i e VIN 12V C5 10nF C1 10µF/35V x2 C4 0.1µ F R4 100KΩ IN BS EN SW A5268 L1 15µH/3.4A VOUT 5V 3A SS SFB GND COMP R1 C3 44.2KΩ1% 3.3nF R2 R3 10KΩ1% 6.98KΩ1% C2 22µF/10V x2 Rev.B.02 1 A5268 3A, 28V, 340KHz Synchronous Rectified Step-Down Converter n Functional Blo...