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USB Single Cell LiPoly courser Resume Rodrigo Forrequi lubiana@gmail.com hypertext transfer protocol://rusticengineering.wordpress.com March 10, 2010 Rodrigo Forrequi email: lubiana@gmail.com http://rusticengineering.wordpress.com 1 USB Single Cell LiPoly Charger atomic number 3 Polymer Battery stationr Introduction atomic number 3 Polymer Batteries be a very common source of index finger today. umteen electronics gadgets have one inside, and they have some sensible features. Ive bought great batteries, with different sizes and capacities for my electronics projects. So long Im using this batteries, coming the problem: charge them. Charger, version 1 So, we take leave to ?nd the correct lap for my DIY charger. After some Google look into I found the maxim MAX1811 IC. Its a single- cell Lithium battery charger that sight be powered directly from a USB or from an outdoor(a) supply up to 6.5V. Its use a SO-8 Package, well-heeled to solder and can be s ampled at Maxim. Other crisp features are: You can engage between 4.1V and 4.2V battery dominion point; You can tell apart between 100mA and 500mA received debilitate from USB; Theres a open drain pin (pin_8) for signaling end of charge condition (2.5V < VBATT < BATT polity Voltage); A internal thermal disagreeable circuit limits the MAX1811 burst temperature to +135°C by reducing the charging current as necessary. According to datasheet, MAX1811 is speci?cally made for USB devices. The minimum potential difference to a common USB-powered device may be as emit as 4.35V when cable and connector drops are considered. The MAX1811 is optimized for operation at these low input voltage levels. But USB hubs may as well as provide as much as 5.5V!. At senior high input voltages (5.5V) and low cell voltages (2.7V), the MAX1811s thermal closed circuit may limit the charge current until the cell voltage rises. My design uses 500mA was charging current (pin 2 - SELI - pu lled up), but MAX1811 barely taken this cu! rrent if the device is a USB powered source. The former(a) separate are two very common atomic number 73 capacitors and...If you fatality to get a full essay, order it on our website: OrderCustomPaper.com

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