LSP5503 Datasheet | Liteon Semiconductor

3A Synchronous Step Down DC/DC Converter Features 3A Output Current Wide 4.5V to 27V Operating Input Range Integrated 100mΩ Power MOSFET Switches Output Adjustable from 0.925V to 24V Up to 96% Efficiency Programmable Soft-Start Stable with Low ESR Ceramic Output Capacitors Fixed 400KHz Frequency Cycle-by-Cycle Over Current Protection Input Under Voltage Lockout SOP8L-EP Package TYPICAL APPLICATION Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Supplies Green Electronics/ Appliances Notebook puters GENERAL DESCRIPTION The LSP5503 is a monolithic synchronous buck regulator. The device integrates 100mΩ MOSFETS that provide 3A continuous load cur-rent over a wide operating input voltage of 4.5V to 27V. Current mode control provides fast transient response and cycle-by-cycle cur-rent limit. An adjustable soft-start prevents inrush current at turn on. In shutdown mode, the supply cur-rent drops below 1µA. This device, available in an SOP8L-EP package, provides a very pact system solution with minimal reliance on external ponents. PIN ASSIGNMENT Top View BS 1 8 SS IN 2 7 EN SW 3 6 P GND 4 EXPOSED PAD PIN DESCRIPTION Name BS IN SW GND FB No. Description Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver. Connect a 0.1u F capacitor between BS and SW. Input Supply. Bypass this pin to G with a low ESR capacitor. See Input Capacitor in the Application Information section. Switch Output. Connect this pin to the switching end of the inductor. Ground. Feedback Input. The voltage at this pin is regulated to 0.925V. Connect to the resistor divider between output and ground to set output voltage. 6 pensation Pin. See Stability pensation in the Application Information section. Enable Input. When higher than 2.5V, this pin turns...