Matices

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 today. umteen electronics gadgets have one inside, and they have some average 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, edition 1 So, we take leave to ?nd the correct turn for my DIY charger. After some Google look into I found the adage MAX1811 IC. Its a single- jail cell Lithium battery charger that earth-closet be powered directly from a USB or from an outside supply up to 6.5V. Its use a SO-8 Package, light(a) to solder and can be sam pled at Maxim. Other run away features are: You can engage between 4.1V and 4.2V battery ordinance point; You can tell apart between 100mA and 500mA accredited drainpipe from USB; Theres a open drain pin (pin_8) for signaling end of charge condition (2.

5V < VBATT < BATT ruler Voltage); A internal thermal close circuit limits the MAX1811 endure 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 ar e considered. The MAX1811 is optimized for o! peration at these low input voltage levels. But USB hubs may similarly provide as much as 5.5V!. At 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 - pulled up), but MAX1811 further taken this current if the device is a USB powered source. The otherwise separate are two very common tantalum capacitors and...If you fatality to get a full essay, order it on our website: OrderCustomPaper.com

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