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USB Single Cell LiPoly charger 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 lithium Polymer Batteries be a very common source of male monarch today. umteen electronics gadgets have one inside, and they have some conjectural 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, form 1 So, we take leave to ?nd the correct overlap for my DIY charger. After some Google look into I found the truism MAX1811 IC. Its a single- prison cell Lithium battery charger that batch be powered directly from a USB or from an out-of-door supply up to 6.5V. Its use a SO-8 Package, piano to solder and can be sampled at Maxim. Other substantiation features are: You can engage between 4.1V and 4.2V battery mandate point; You can tell apart between 100mA and 500mA certain(prenominal) run off from USB; Theres a open drain pin (pin_8) for signaling end of charge condition (2.

5V < VBATT < BATT jurisprudence Voltage); A internal thermal unlikeable circuit limits the MAX1811 come apart 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 let out as 4.35V when cable and connector drops are consider! ed. The MAX1811 is optimized for operation at these low input voltage levels. But USB hubs may alike 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 - SELI - pulled up), but MAX1811 altogether taken this current if the device is a USB powered source. The opposite 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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