AOZ1031AI Alpha & Omega

AOZ1031AI EZBuck 3A Synchronous Buck Regulator General Description Features The AOZ1031A is a high efficiency, easy to use, 3A z 4.5V to 18V operating input voltage range synchronous buck regulator. The AOZ1031A works from z Synchronous Buck: 80m internal high-side switch 4.5V to 18V input voltage range, and provides up to 3A of and 30m internal low-side switch with integrated continuous output current with an output voltage adjust- schottky diode able down to 0.8V. z High efficiency: up to 95% z Internal soft start The AOZ1031A comes in a SO-8 package and is rated over a -40C to +85C operating ambient temperature z Output voltage adjustable to 0.8V range. z 3A continuous output current z Fixed 600kHz PWM operation z Pulse skipping at light load for high efficiency over entire load range z Cycle-by-cycle current limit z Pre-bias start-up z Short-circuit protection z Thermal shutdown z SO-8 package Applications z Point of load DC/DC converters z LCD TV z Set top boxes z DVD/Blu-ray players/recorders z Cable modems z PCIe graphics cards z Telecom/Networking/Datacom equipment Typical Application VIN C1 22F VIN L1 4.7H EN VOUT LX AOZ1031 R1 COMP C2, C3 R 22F C FB AGND PGND R2 C C Figure 1. 3.3V 3A Synchronous Buck Regulator Rev. 1.6 March 2010 www.aosmd.com Page 1 of 15AOZ1031AI Ordering Information Part Number Ambient Temperature Range Package Environmental AOZ1031AI -40C to +85C SO-8 RoHS Compliant Green Product AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit www.aosmd.com/web/quality/rohs compliant.jsp for additional information. Pin Configuration 1 8 PGND LX 2 7 VIN LX 3 6 AGND EN 4 5 FB COMP SO-8 (Top View) Pin Description Pin Number Pin Name Pin Function 1 PGND Power ground. PGND needs to be electrically connected to AGND. 2 VIN Supply voltage input. When VIN rises above the UVLO threshold and EN is logic high, the device starts up. 3 AGND Analog ground. AGND is the reference point for controller section. AGND needs to be electrically connected to PGND. 4 FB Feedback input. The FB pin is used to set the output voltage via a resistive voltage divider between the output and AGND. 5 COMP External loop compensation pin. Connect a RC network between COMP and AGND to compensate the control loop. 6 EN Enable pin. Pull EN to logic high to enable the device. Pull EN to logic low to disable the device. Do not leave it open. 7, 8 LX Switching node. PWM output connection to inductor. Rev. 1.6 March 2010 www.aosmd.com Page 2 of 15