AOZ1905FI Alpha & Omega

AOZ1905 EZBoost 2A General Purpose Regulator General Description Features The AOZ1905 EZBoost is a high-performance, current- 2.7V to 5.5V input voltage range mode, constant frequency step-up regulator with internal Adjustable output up to 24V MOSFET. 600kHz/1.2MHz switching frequency allows 600kHz/1.2MHz constant switching frequency the use of low-profile inductor and capacitors. The Cycle-by-cycle current limit current-mode control ensures easy loop compensation and fast transient response. The AOZ1905 works from Thermal overload protection a 2.7V to 5.5V input voltage range and generates an Programmable Soft-start output voltage as high as 24V. Other features include Small 3mm x 3mm DFN 10L package input under-voltage lockout, cycle-by-cycle current limit, MSOP-8L package thermal shutdown and soft-start. The AOZ1905 is available in a tiny 3mm x 3mm 10-pin Applications DFN package and MSOP8 package and is rated over a LCD TV -40C to +85C operating temperature range. LCD Monitors Notebook Displays PCMCIA Cards Hand-Held Devices GPS Power TV Tuner Typical Application L1 4.7H D1 VIN VOUT C1 LX 10F R2 C2 IN 10F FB FSEL AOZ1905 R1 SS C4 GND COMP OFF ON EN R3 C3 Figure 1. Typical Application Circuit Rev. 1.5 December 2008 www.aosmd.com Page 1 of 16AOZ1905 Ordering Information Part Number Operating Temperature Range Package Environmental AOZ1905DI -40C to +85C 3x3 DFN-10 Green Product AOZ1905FI -40C to +85C MSOP-8 RoHS Compliant AOZ1905FIL -40C to +85C MSOP-8 Green Product All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards. Parts marked as Green Products (with L suffix) 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 10 COMP SS 1 8 2 9 COMP SS FB FSEL 3 8 2 7 FB FSEL EN IN 4 7 3 6 GND LX EN IN 4 5 5 6 GND LX GND LX MSOP-8 DFN-10 (Top View) (Top View) Pin Description Pin Number Pin Name DFN-10 MSOP-8 Pin Function COMP 1 1 Compensation Pin. COMP is the output of the internal transconductance error amplifier. Connect a RC network from COMP to GND to compensate the loop. FB 2 2 Feedback Input. Connect a resistive divider between the boost regulator output and ground with the center tap connected to FB to set output voltage. EN 3 3 Enable Input. Pull EN high to enable the boost regulator and pull EN low to dis- able the regulator. GND 4, 5 4 System Ground. LX 6, 7 5 Boost Regulator Switching Node. IN 8 6 Input Supply Pin. FSEL 9 7 Frequency Select Pin. The switching frequency is 1.2MHz when FSEL is connected to IN, and 600kHz when FSEL is connected to ground. SS 10 8 Soft-Start Pin. Connect a capacitor from SS to GND to set the soft-start period. Rev. 1.5 December 2008 www.aosmd.com Page 2 of 16