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USB Single Cell LiPoly courser Resume Rodrigo Forrequi lubiana@gmail.com hypertext transfer communications 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 powerfulness today. umteen electronics gadgets have one inside, and they have some tenable 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, variation 1 So, we take leave to ?nd the correct round for my DIY charger. After some Google look into I found the truism MAX1811 IC. Its a single- cadre Lithium battery charger that flowerpot be powered directly from a USB or from an outside supply up to 6.5V. Its use a SO-8 Package, idle to solder and can be sampled at Maxim. Other cut features are: You can engage between 4.1V and 4.2V battery pattern point; You can tell apart between 100mA and 500mA authorized drainpipe from USB; Theres a open drain pin (pin_8) for signaling end of charge condition (2.5V < VBATT < BATT formula Voltage); A internal thermal disagreeable circuit limits the MAX1811 develop 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 utter 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 also provide as much as 5.5V!. At highschool 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 - SE LI - pulled up), but MAX1811 altogether ta! ken this current if the device is a USB powered source. The other 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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