Battery Power - Spring 2015 - (Page 25)

ICs & Semiconductors * New Products Toshiba Launches 12-Watt Receiver IC for Fast Wireless Charging of Tablet Devices Toshiba America Electronic Components, Inc. (TAEC) has introduced its newest IC enabling wireless mobile device charging. The TC7765WBG wireless power receiver controller IC effectively manages the 12-watt power transfer necessary for wireless charging of tablet devices. Compatible with the Qi lowpower specification version 1.1 defined by the Wireless Power Consortium (WPC), the new IC delivers a user experience comparable to that of conventional wired charging for tablets, as well as smartphones and other portable devices. The TC7765WBG wireless power receiver controller IC is built with Toshiba's mixed-signal process using a high-performance MOSFET design that maximizes power efficiency and thermal performance. The IC combines modulation and control circuitry with a rectifier power pickup, I2C interface and circuit protection functions. Compliance with the "Foreign Object Detection" (FOD) aspect of the Qi specification prevents heating of any metal objects in the path of wireless power transfer between the receiver and the transmitter. The 12 W receiver IC is designed in the same size package as Toshiba's 5 W wireless power receiver controller TC7763WBG, a WCSP-28 2.4 mm by 3.67 mm by 0.5 mm package, further facilitating design-in and contributing to the new chipset's backward compatibility with the lower-power receiver IC. Combining the TC7765WBG with a copper coil, charging IC and peripheral components creates a wireless power receiver. Joining the receiver with a Qi-compliant wireless power transmitter containing a Toshiba wireless power transmitter IC forms a complete wireless power charging solution. Stand-Alone Lead Acid Battery Balancing IC Works with Up to Four 12 Volt Batteries in Series Linear Technology Corp. has released the LTC3305, a single IC, stand-alone multicell battery balancer for 12 V lead acid batteries. Balancing works by absorbing charge from higher voltage batteries and transferring that charge to lower voltage batteries so that all are charged equally. Charge is transferred using a lower capacity battery that is sequentially connected across the batteries in the stack. Not only does this battery transfer charge, but the energy in the transfer battery adds to the total energy in the stack, thus increasing capacity. Included on the chip is sequencing, drive circuitry for high voltage external NFETs, voltage monitoring and protection. The LTC3305 is designed for stand-alone operation and does not require a microprocessor or other control circuitry. With the LTC3305, one battery in the stack can be replaced and balanced to the remaining batteries. The LTC3305 is well suited for applications such as telecom backup systems, home batterypowered backup systems, electric vehicles and industrial lighting systems. The LTC3305 employs an auxiliary battery storage cell to transfer charge to or from each individual battery in the stack. A mode pin provides two operating modes: timer mode and continuous mode. In timer mode, once the balancing operation is completed, the LTC3305 goes into a low power state for a programmed time and then periodically rebalances the batteries. In continuous mode, the balancing operation continues even after the batteries are balanced to their programmed termination voltage. Further, additional devices can be stacked to balance higher voltage series battery packs. The LTC3305 is offered in a thermally enhanced low profile (0.75 mm) 38-lead TSSOP package. The E and I grades are specified with operating junction temperature range of -40°C to 125°C. Devices are available from stock and 1,000-piece pricing starts at $6.95. Spring 2015 * Battery Power 25

Table of Contents for the Digital Edition of Battery Power - Spring 2015

Battery Power - Spring 2015
Batteries: An Integrated Solution
Preventing Counterfeiting: Challenges and Selection Criteria for An Ideal Authentication Solution
Extending Battery Life
Batter Management with an Intelligent Battery Sensor is Vital to The Success of Future Automotive Designs
ICs & Semiconductors
Testing & Monitoring
Conference Preview: Critical Power 2015
Research & Development
Industry News
Application Profile
Calendar of Events

Battery Power - Spring 2015