A5268完整版.pdf

3A, 28V, 340KHz Synchronous A5268 Rectified Step-Down Converter n General Description n Features The A5268 is a fixed frequency monolithic synchro- l 3A Output Current nous buck regulator that accepts input voltage from 4.75V to 28V. Two NMOS switches with low on-resistance are l W ide 4.75V to 28V Operating Input Range integrated on the die. Current mode topology is used for l Integrated Power MOSFET Switches fast transient response and good loop stability. l Output Adjustable from 0.925V to 25V Shutdown mode reduces the input supply current to less l Up to 95% Efficiency than 1A. An adjustable soft-start prevents inrush current l Programmable Soft Start at turn-on. l Stable with Low ESR Ceramic Output This device is available in SOP-8/PP package with ex- Capacitors posed pad for low thermal resistance. l Cycle-by Cycle Over Current Protection l Fixed 340KHz Frequency n Applications l Input Under Voltage Lockout l System Protected by Over-current Limiting, l Distributed Power System Over-voltage Protection and Thermal Shut- l Networking System down l FPGA, DSP, ASIC Power Supplies l