AOZ1036PI_3

AOZ1036 EZBuck™ 5A Synchronous Buck Regulator Not Recommended For New Designs General Description Features The AOZ1036 is a high efficiency, easy to use, 5A synchronous buck regulator. The AOZ1036 works from 4.5V to 18V input voltage range, and provides up to 5A of continuous output current with an output voltage adjustable down to 0.8V. z 4.5V to 18V operating input voltage range The AOZ1036 comes in both a 5x4 DFN-8 and an exposed pad SO-8 package and is rated over a -40°C to +85°C ambient temperature range. z Replacement Part: AOZ3018PI z z Synchronous Buck: 55mΩ internal high-side switch z z z ns ig Fo r z es z D z ew z N z and 19mΩ Internal low-side switch High efficiency: up to 95% Internal soft start Output voltage adjustable to 0.8V 5A continuous output current Fixed 500kHz PWM operation Cycle-by-cycle current limit Pre-bias start-up Short-circuit protection Thermal shutdown Thermally enhanced 5x4 DFN-8 and exposed pad SO-8 packages Applications z Point of load DC/DC converters en de d z LCD TV z Cable modems z PCIe graphics cards ec VIN z DVD / Blu-ray players/recorders om m Typical Application z Set top boxes R C1 22µF Ceramic ot VIN N EN L1 4.7µH AOZ1036 R1 COMP RC CC VOUT LX C2, C3 22µF Ceramic FB AGND PGND R2 Figure 1. 3.3V 5A Synchronous Buck Regulator Rev. 1.1 September 2010 www.aosmd.com Page 1 of 17 AOZ1036 Ordering Information Part Number Ambient Temperature Range AOZ1036DI Environmental 5x4 DFN-8 -40°C to +85°C AOZ1036PI Package Green Product 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. 1 8 LX PGND 1 7 LX VIN 2 6 EN AGND 3 5 COMP FB 4 8 LX 2 AGND 3 4 7 NC 6 EN 5 COMP 5x4 DFN-8 Exposed Pad SO-8 (Top View) (Top View) Fo r N FB ew GND PAD (LX) D VIN NC es PGND ig ns Pin Configuration Pin Description Pin Name 1 1 PGND 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. ec 5 ot N 7, 8 COMP 6 EN R 6 5 Rev. 1.1 September 2010 de d Exposed Pad SO-8 om m 5x4 DFN-8 en Pin Number Pin Function Power ground. Electrically needs to be connected to AGND. External loop compensation pin. The enable pin is active high. Connect it to VIN if not used and do not leave it open. 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. www.aosmd.com Page 2 of 17 AOZ1036 Block Diagram VIN UVLO & POR EN Internal +5V 5V LDO Regulator OTP + ISen – Reference & Bias Softstart ns Q1 ig ILimit FB – – Level Shifter + FET Driver PWM Control Logic PWM Comp + N Short Circuit Detection Comparator 500kHz Oscillator – d 0.2V AGND de en Absolute Maximum Ratings EN to AGND om m ot FB to AGND ec LX to AGND R LX to AGND The device is not guaranteed to operate beyond the Maximum Recommended Operating Conditions. Rating Supply Voltage (VIN) Parameter 20V -0.7V to VIN+0.3V 23V (