AOZ1280CI Alpha & Omega

AOZ1280 EZBuck 1.2 A Simple Buck Regulator General Description Features The AOZ1280 is a high efficiency, simple to use, 1.2 A 3 V to 26 V operating input voltage range buck regulator which is flexible enough to be optimized 240 m internal NMOS for a variety of applications. The AOZ1280 operates from High efficiency: up to 95 % a 3 V to 26 V input voltage range, and provides up to Internal compensation 1.2 A of continuous output current. The output voltage is adjustable down to 0.8 V. The fixed 1.5 MHz PWM 1.2 A continuous output current switching frequency reduces inductor size. Fixed 1.5 MHz PWM operation Internal soft start The AOZ1280 comes in a SOT23-6L package and is Output voltage adjustable down to 0.8 V rated over a -40 C to +85 C operating ambient temperature range. Cycle-by-cycle current limit Short-circuit protection Thermal shutdown Small size SOT23-6L Applications Point of load DC/DC conversion Set top boxes DVD drives and HDD LCD Monitors & TVs Cable modems Telecom/Networking/Datacom equipment Typical Application VIN C3 C1 4.7F VIN L1 2.2H EN VOUT LX AOZ1280 R1 C2 10F FB GND R2 Figure 1. 1.2 A Buck Regulator Rev. 1.1 August 2011 www.aosmd.com Page 1 of 13 AOZ1280 Ordering Information Part Number Ambient Temperature Range Package Environmental AOZ1280CI -40 C to +85 C SOT23-6L Green Product RoHS Compliant 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 6 BST LX 2 5 GND VIN 3 4 FB EN SOT23-6L (Top View) Pin Description Pin Number Pin Name Pin Function 1 BST Bootstrap voltage input. High side driver supply. Connected to 10 nF capacitor between BST and LX. 2 GND Ground. 3 FB Feedback input. It is regulated to 0.8 V. The FB pin is used to determine the PWM output voltage via a resistor divider between the output and GND. 4 EN Enable pin. The enable pin is active high. Connect EN pin to VIN through current limiting resistor. Do not leave the EN pin floating. 5 VIN Supply voltage input. Input range from 3 V to 26 V. When VIN rises above the UVLO threshold the device starts up. 6 LX PWM output connection to inductor. Rev. 1.1 August 2011 www.aosmd.com Page 2 of 13