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DC/DC converter platform has eight VID output settings

Posted: 15 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC buck converters? output voltage?

Semtech Corp. has released the SC198 and SC198A dual-output synchronous DC/DC buck converters each with eight VID programmable output voltage settings that allow portable systems manufacturers to easily lower processor voltages and extend the battery life of their devices.

The SC198 and SC198A provide flexible and cost-effective options for powering core ICs in fixed 5V, single Li-ion cell portable systems or three-cell NiMH/NiCd systems such as mobile/cordless phones, MP3 players and handheld game consoles.

The SC198 and SC198A operate with an input voltage range of 2.7V to 5.5V. The output voltage for the devices can be digitally programmed via control pins to eight different output pairs, ranging from 1V to 3.3V. This capability allows system designers to change the output voltage without the need for four programming resistors.

Each of the two outputs from the SC198A can supply 800mA of current while the SC198 sources up to 600mA per converter.

Each channel from either converter operates with a fixed 1MHz oscillator frequency, which maximizes the efficiency under normal loads. Under light loads, the regulators automatically transition to power save (PSAVE) mode to maintain high efficiency.

The oscillators on both channels operate 180 out-of-phase with each other to minimize the input ripple current. Both devices can be forced to fixed pulse-width modulation (PWM) mode to further reduce noise for sensitive applications. Device quiescent current in shutdown is less than 1?A.

The regulators offer short-circuit and thermal protection on the output to safeguard the devices under extreme operating conditions. The SC198 and SC198A are both offered in thermally enhanced, RoHS and WEEE compliant 4mm x 4mm MLPQ-20 packages.

"We've combined the Semtech legacy of feature-rich converters with new integration and miniaturization capabilities to deliver compact and easy-to-use converters. VID output control as well as the integration of output voltage setting resistors and compensation components reduces both component selection and design time," said Julius Sarkis, product marketing manager of power management unit at Semtech.

Other features of the SC198 and SC198A include eight programmable output voltages ranging from 1V to 3.3V, 2.7-5V input range and less than 50?A of device quiescent current for higher efficiency at light loads. The device is touted to offer a high efficiency of over 90 percent peak, an oscillator 180 out-of-phase to minimize device input ripple current, soft start in-rush current protection, optional power-save mode under light-load conditions and optional synchronizable clock input.

The SC198 and SC198A are both available immediately in production quantities and are both priced at 98 cents each in 1,000-piece lots.




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