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Industry News
July 22, 2011
Portable Power Management at Techno Frontier
Exclusive
A variety of products and technologies targeted at power management in portable devices were on display at Techno Frontier. Toko, Fujitsu Semiconductor and Toshiba Semiconductor were a few of the companies targeting portable applications. Toko demonstrated wireless charging modules, Fujitsu announced two new dc-dc converters and Toshiba expanded its offering of MOSFETs.
The Toko booth featured a demonstration of wireless inductive charging technology. Wireless inductive charging is a relatively new category for portable power management and Toko announced cumulative shipment of over 15 million units of its wireless power transmission module. Toko also announced a new generation of modules with higher-voltage and higher-current capabilities. The new modules can deliver up to 800mA at up to 12Vdc, with an overall power limitation of 4W.
The previous-generation modules operate over an input voltage range of 10.8-13.2Vdc and produce an output voltage greater than 3Vdc, generating a current of 75mA across a gap of 4mm. While the previous-generation modules are designed for trickle charging various battery-powered devices, the newest modules are capable of much higher charge rates.
Fujitsu was demonstrating dc-dc converters optimized for specific portable power applications. The MB392A02A is a 2-channel dc-dc buck converter IC with synchronous rectification and two built-in LDOs Designed to operate over a voltage range of 5.5-28Vdc, this device is offered in a QFN28 package. With an adjustable frequency of 100-600kHz, the outputs can deliver 50mA at 3.3Vdc and 100mA at 5Vdc.
In addition, Fujitsu announced the MB39C326 6MHz, buck-boost dc-dc converter optimized for powering the RF amplifier in mobile devices powered by a single Li-ion cell. These devices can provide output voltages from 0.4-4.5Vdc and operate over an input voltage range of 2.5-4.8Vdc. The output voltage is set with an external resistor. The device operates with a 0.5 uH inductor and is offered in a 20-pin plastic WLP package.
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Toshiba Semiconductor announced the addition of the SSM6P47NU and SSM6P49NU to its lineup of small signal MOSFETs. Targeted at use in charging circuits for mobile devices, these dual P-channel MOSFETs feature lower on-resistance compared with previous-generation devices.
Toshiba’s SSM6P47NU and SSM6P49NU address the demand for compactness by combining two independent transistors into a UDFN6 package (2.0 x 2.0mm). A 1.8Vdc drive, combined with a 4A drain current allow the SSM6P47NU and SSM6P49NU to run at a high rate of efficiency, enabling batteries to be fully charged in less time. In addition to being used charging circuits the new devices are capable of acting as a switch to control which loads are connected or disconnected from the circuit.
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Fujitsu Semiconductor America, Inc.
Techno Frontier Week
Toko Inc.
Toshiba Semiconductor
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