AOZ1037PI Alpha & Omega

AOZ1037 EZBuck 5A Synchronous Buck Regulator General Description Features The AOZ1037 is a high efficiency, simple to use, 5A z 4.5 to 18V operating input voltage range synchronous buck regulator. The AOZ1037 works from a z Synchronous rectification: 55m internal high-side 4.5V to 18V input voltage range, and provides up to 5A switch and 19m Internal low-side switch of continuous output current with an output voltage z High efficiency: up to 95% adjustable down to 0.8V. z Internal soft start The AOZ1037 comes in an exposed pad SO-8 packages z Active high power good state and is rated over a -40C to +85C ambient temperature z Output voltage adjustable to 0.8V range. z 5A continuous output current z Fixed 500kHz PWM operation z Cycle-by-cycle current limit z Pre-bias start-up z Short-circuit protection z Thermal shutdown z Exposed pad SO-8 package Applications z Point of load DC/DC conversion z LCD TVs 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 5V C1 R3 22F VIN PGOOD L1 4.7H EN VOUT LX AOZ1037 R1 COMP C2, C3 R 22F C FB AGND PGND R2 C C Figure 1. 3.3V/5A Synchronous Buck Regulator Rev. 1.1 September 2010 www.aosmd.com Page 1 of 14AOZ1037 Ordering Information Part Number Ambient Temperature Range Package Environmental AOZ1037PI -40C to +85C EPAD SO-8 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 NC 2 7 VIN PGOOD PAD (LX) 3 6 AGND EN 4 5 FB COMP Exposed Pad SO-8 (Top View) Pin Description Pin Number Pin Name Pin Function 1 PGND Power ground. PGND needs to be electrically connected to AGND. 2V Supply voltage input. When V rises above the UVLO threshold and EN is logic high, the device IN IN 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 resistor divider between the out- put and AGND. 5 COMP External loop compensation pin. Connect a RC network between COMP and AGND to compen- sate 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. if on/off control is not needed, connect it to V and do not leave it open. IN 7 PGOOD Power Good Output. PGOOD is an open-drain output that indicates the status of output voltage. PGOOD is pulled low when output is below 90% of the normal regulation. 8 NC No Connect. Pin 8 is not internally connected. Pad LX Switching node. LX is the drain of the internal PFET. LX is used as the thermal pad of the power stage. Rev. 1.1 September 2010 www.aosmd.com Page 2 of 14