The bq28400 provides battery capacity and safety monitoring optimized specifically for 2-cell Li-Ion and Li-Pol applications. This single-chip fuel gauge and analog front end (AFE) provide a first level of protection against all cell fault conditions: over/undervoltage, overcurrent, temperature, and imbalance between cells.
2-Cell Lithium-Ion Fuel Gauge and Protector – [Link]
Of all the criticisms of electric vehicles, probably the most commonly-heard is that their batteries take too long to recharge — after all, limited range wouldn’t be such a big deal if the cars could be juiced up while out and about, in just a few minutes. Well, while no one is promising anything, new batteries developed at the University of Illinois, Urbana-Champaign do indeed look like they might be a step very much in the right direction. They are said to offer all the advantages of capacitors and batteries, in one unit. [via]
Complete battery recharging within minutes – [Link]
Microchip’s MCP79411 general purpose I2C™Compatible real-time clock/calendar (RTCC) is highly integrated with nonvolatile memory and advanced features including a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. It can use a low-cost 32.768 kHz crystal or other clock source and the chip operates over a supply range of 1.8 to 5.5 volts. [via]
MCP7941X I2C RTCC with EEPROM, SRAM, Unique ID and Battery Switchover – [Link]
An introduction to USB battery charging: a survival guide. [via]
Arguably the most useful part of USB’s power capabilities is the ability to charge batteries in portable devices, but there is more to battery charging than picking a power source, USB or otherwise. This is particularly true for Li+ batteries, where improper charging can not only shorten battery life, but also can be a safety hazard. A well-designed charger optimizes safety and the user experience. It also lowers cost by reducing customer returns and warranty repairs. Charging batteries from USB requires balancing battery “care and feeding” with the power limitations of USB as well as the size and cost barriers ever present in portable consumer device designs. This article discusses how to achieve this balance.
The basics of USB battery charging: a survival guide – [Link]
Microchip announced the expansion of its analog power-management family with the MCP73831 battery charger, a fully-integrated, single-cell, Li-ion/Li-Polymer charge-management controller. Tiny 500mA linear charge management controller can be powered directly from the USB port. Includes integrated pass transistor, current sense and reverse-discharge protection, the MCP73831 charger reduces the number of components needed for battery-charger designs. Its highly accurate, pre-set voltage regulation (maximum accuracy 0.5 per cent to 0.75 per cent) results in more fully charged batteries and extended battery life. Since the MCP73831 charge-management controller includes a pass transistor, current sense and reverse-discharge protection on a single chip, it reduces the number of system components needed for battery-charger designs, which, added Microchip, lowers overall system costs.
Microchip’s Li-ion battery charger MCP73831 IC – [Link]
The circuit can be used to charge 12V lead acid batteries.
Pin 1 of the LM317 IC is the control pin which is used to control the charging voltage, Pin 2 is the output at which the charging voltage appears, Pin 3 is the input to which the regulated DC supply is given.
Battery Charger Circuit – [Link]
This project is an intelligent battery charger based on PIC16F628.
PIC16F628 intelligent battery charger- [Link]
Check out the MAX8934G dual-input Li+/Li-Poly linear battery charger: [via]
- Monitors temperature to ensure safe charging and JEITA battery charging specification compliance
- Delivers smart power path control to allow the system to be powered when the battery is completely dead
- Charges safely by lowering the termination voltage and charge rate in hot or cold temperature
- Includes all integrated MOSFETs
MAX8934G dual-input linear Li-Poly battery charger – [Link]