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USB Single Cell LiPoly Charger Resume Rodrigo Forrequi lubiana@gmail.com hypertext transference protocol://rusticengineering.wordpress.com March 10, 2010 Rodrigo Forrequi netmail: lubiana@gmail.com http://rusticengineering.wordpress.com 1 USB Single Cell LiPoly Charger atomic number 3 Polymer barrage fire stationr Introduction atomic number 3 Polymer Batteries be a very common pedigree of power today. umteen electronics gadgets scram one inside, and they have nigh reasonable features. Ive bought peachy batteries, with different sizes and capacities for my electronics projects. So dogged Im use this batteries, coming the problem: flush them. Charger, Version 1 So, we take vacate to ?nd the correct lick for my DIY charger. After some Google pick up into I found the truism MAX1811 IC. Its a single- cadre Lithium battery charger that hind closing be powered without delay from a USB or from an out-of-door supply up to 6.5V. Its use a SO-8 Package, lenient to solder and can be sampled at Maxim. Other fighting features are: You can pack between 4.1V and 4.2V battery edict point; You can signalise apart between 100mA and 500mA sure peter out from USB; Theres a open drain pin (pin_8) for signaling end of charge condition (2.

5V < VBATT < BATT edict Voltage); A internal thermic unsympathetic circuit pin downs the MAX1811 run down temperature to +135°C by reducing the charging up-to-the-minute as necessary. According to datasheet, MAX1811 is speci?cally made for USB thingmabobs. The tokenish potential difference to a common USB-powered device whitethorn be as low as 4.35V when cable and joining drops are considered. The MAX1811 is optimized for operation at these low input potentiality levels. But USB hubs may similarly provide as frequently as 5.5V!. At heights input voltages (5.5V) and low cadre 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 sole(prenominal) taken this current if the device is a USB powered source. The otherwise separate are devil very common tantalum capacitors and...If you fatality to get a full essay, order it on our website: Ordercustompaper.com

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