AOZ1034DI Alpha & Omega

AOZ1034 EZBuck 4A Synchronous Buck Regulator General Description Features The AOZ1034 is a synchronous high efficiency, simple to z 4.5V to 18V operating input voltage range use, 4A buck regulator. The AOZ1034 works from a 4.5V z Synchronous rectification: 60m internal high-side to 18V input voltage range, and provides up to 4A of switch and 20m Internal low-side switch continuous output current with an output voltage z High efficiency: up to 95% adjustable down to 0.8V. z Internal soft start z Output voltage adjustable to 0.8V The AOZ1034 comes in both a 5x4 DFN-8 and an exposed pad SO-8 package and is rated over a z 4A continuous output current -40C to +85C ambient temperature range. z Fixed 500kHz PWM operation z Cycle-by-cycle current limit z Pre-bias start-up z Short-circuit protection z Thermal shutdown z Thermally enhanced 5x4 DFN-8 and exposed pad SO-8 packages Applications z Point of load DC/DC conversion z PCIe graphics cards z Set top boxes z DVD drives and HDD z LCD panels z Cable modems z Telecom/Networking/Datacom equipment Typical Application VIN C1 22F Ceramic VIN L1 4.7H EN VOUT LX AOZ1034 R1 COMP C2, C3 R C FB 22F Ceramic AGND PGND R2 C C Figure 1. 3.3V 4A Synchronous Buck Regulator Rev. 1.1 September 2010 www.aosmd.com Page 1 of 18 AOZ1034 Ordering Information Part Number Ambient Temperature Range Package Environmental AOZ1034DI 5x4 DFN-8 -40C to +85C Green Product AOZ1034PI Exposed Pad SO-8 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 1 8 PGND LX PGND NC LX 2 7 VIN LX 2 7 VIN NC PAD (LX) 3 6 3 6 AGND EN AGND EN GND 4 5 FB COMP 4 5 FB COMP Exposed Pad SO-8 5x4 DFN-8 (Top View) (Top View) Pin Description Pin Number Exposed 5x4 DFN-8 Pad SO-8 Pin Name Pin Function 1 1 PGND Power ground. Electrically needs to be connected to AGND. 2 2 VIN Supply voltage input. When VIN rises above the UVLO threshold the device starts up. 3 3 AGND Reference connection for controller section. Also used as thermal connection for controller section. Electrically needs to be connected to PGND. 4 4 FB The FB pin is used to determine the output voltage via a resistor divider between the output and GND. 5 5 COMP External loop compensation pin. 6 6 EN The enable pin is active high. Connect it to VIN if not used and do not leave it open. 7, 8 Pad LX PWM output connection to inductor. 7, 8 NC No Connect. Pin 7 and 8 are not internally connected. Connect these two pins externally to LX and use them for better thermal performance. Rev. 1.1 September 2010 www.aosmd.com Page 2 of 18