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Vishay launches new synchronous buck

Vishay Electronic : 20 May, 2002  (New Product)
Vishay Intertechnology, announced the release of five new synchronous buck converters in its FunctionPAK series of single-package, fully integrated dc-to-dc converters.
Provided in a surface-mount BGA/LGA package with an area of 14.7 mm by 12.2 mm and a maximum height profile of just 3 mm, FunctionPAK converters deliver record-breaking power density of more than 100 W per cubic inch in the industry's smallest and lowest-profile solution footprint. No external components are required for a complete solution.

The new FunctionPAK converters will be used to stabilize rechargeable battery outputs, shift DC voltage levels, filter noise, and reduce ripple in power supplies for cell phones, portable computers, digital cameras, routers, and other portable electronics systems.

Delivering high-efficiency operation over a large load range, the FunctionPAK products released today convert inputs ranging from 2.7 V to 6 V to output voltages ranging from 1.5 V to 3.6 V. Output power and maximum current are 3 W and 1 A for the FX5545G201, 5 W and 1.5 A for the FX5545G005, 6.5 W and 2 A for the FX5545G105, 8 W and 2.5 A for the FX5545G205, and 10 W and 3 A for the FX5545G305.

All five converters feature a programmable topology, allowing designers to power multiple loads and utilize various battery configurations and chemistries with a single device. Each FunctionPAK converter draws just 1 mA of current in shutdown mode and features programmable PWM and PSM output controls to optimize power conversion efficiency in standby and idle modes, thereby prolonging overall battery life and talk time in cell phones. With 100% duty cycle control for PSM operation, each converter acts much like a saturated linear regulator to extract every bit of power from single-cell lithium ion or triple-cell NiCd and NiMH battery packs and thus deliver the highest potential output voltage.

Vishay's FunctionPAK converters feature a select combination of primary and secondary power MOSFETs, a diode, a controller IC, and up to 15 discrete passive components in one package, taking up significantly less board space than even the tightest discrete layout while delivering efficiency up to 95%. By greatly reducing the number of components required on the printed circuit board for the power conversion function, fully integrated FunctionPAK devices enable design of smaller, lighter portable products and streamline the product development, testing, purchasing, and assembly processes for OEMs.

For maximum reliability, the 20-port BGA/LGA package has the same pin-outs for all buck converter models, allowing designers to use just one layout for all models, all output voltages, and all power or current variations. All versions can be supplied with a user-selectable output voltage, allowing one basic model to be used for all output voltages. FunctionPAK is rated for the full industrial temperature range of -40C to +85C.

Samples and production quantities of the FunctionPAK FX5545G201, FX5545G005, FX5545G105, FX5545G205, and FX5545G305 are available now, with lead times of four to six weeks for larger orders.
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