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USB Single Cell LiPoly battery charger 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 lithium Polymer Batteries be a very common source of major power today. umteen electronics gadgets have one inside, and they have some apt 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, discrepancy 1 So, we take leave to ?nd the correct lap for my DIY charger. After some Google look into I found the adage MAX1811 IC. Its a single- cubicle Lithium battery charger that lowlife be powered directly from a USB or from an remote supply up to 6.5V. Its use a SO-8 Package, well-off to solder and can be sampled at Maxim. Other buffalo chip features are: You can engage between 4.1V and 4.2V battery regularisation point; You can tell apart between 100mA and 500mA legitimate conk out from USB; Theres a open drain pin (pin_8) for signaling end of charge condition (2.

5V < VBATT < BATT normal Voltage); A internal thermal shut circuit limits the MAX1811 make pass 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 loose as 4.35V when cable and connector drops are considered. T! he MAX1811 is optimized for operation 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 still taken this current if the device is a USB powered source. The new(prenominal) 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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