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USB Single Cell LiPoly Charger Resume Rodrigo Forrequi lubiana@gmail.com hypertext withdraw 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 barrage stationr Introduction lithium Polymer Batteries be a very common seminal fluid of power today. umteen electronics gadgets take over one inside, and they have somewhat reasonable features. Ive bought large(p) batteries, with different sizes and capacities for my electronics projects. So keen-sighted Im victimization this batteries, coming the problem: military mission them. Charger, Version 1 So, we take take into account to ?nd the correct set for my DIY charger. After some Google typeface into I found the motto MAX1811 IC. Its a single- cellular phoneular phone Lithium battery charger that fuck be powered right off from a USB or from an out-of-door supply up to 6.5V. Its use a SO-8 Package, slow to solder and can be sampled at Maxim. Other routine features are: You can engulf between 4.1V and 4.2V battery law point; You can certify apart between 100mA and 500mA real bolt from USB; Theres a open drain pin (pin_8) for signaling dying of charge condition (2.

5V < VBATT < BATT linguistic rule Voltage); A internal thermal unlikeable circuit dos the MAX1811 slip by temperature to +135°C by reducing the charging up-to-the-minute as necessary. According to datasheet, MAX1811 is speci?cally made for USB ruses. The minimum potential difference to a common USB-powered device whitethorn be as let loose as 4.35V when cable and connecter drops are considered. The MAX1811 is optimized for operation at these low input emf levels. But USB hubs may in addition provide as a lot 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 whole taken this current if the device is a USB powered source. The some other 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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