AOZ1036PI

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 z Synchronous Buck: 55mΩ internal high-side switch z Replacement Part: AOZ6605PI 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 ot R C1 22µF Ceramic VIN N EN L1 4.7µH AOZ1036 COMP R1 RC CC VOUT LX FB AGND PGND C2, C3 22µF Ceramic 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. LX PGND 1 VIN 2 7 LX VIN 2 AGND 3 6 EN AGND 3 5 COMP FB 4 GND 4 1 PGND 2 2 VIN 3 3 AGND 4 4 5 COMP en Power ground. Electrically needs to be connected to AGND. FB The FB pin is used to determine the output voltage via a resistor divider between the output and GND. om m ec Pin Function Supply voltage input. When VIN rises above the UVLO threshold the device starts up. 5 COMP 6 EN R ot N EN Fo r 1 d Pin Name de Exposed Pad SO-8 Rev. 1.1 September 2010 6 (Top View) 5x4 DFN-8 7, 8 NC Exposed Pad SO-8 Pin Number 6 NC 7 (Top View) Pin Description 5 PAD (LX) 5x4 DFN-8 N FB 8 es 8 LX D 1 ew PGND ig ns Pin Configuration Reference connection for controller section. Also used as thermal connection for controller section. Electrically needs to be connected to PGND. 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 Q1 – – Level Shifter + FET Driver PWM Control Logic PWM Comp + N 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 (