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Maxim slave controller targets low voltage dc/dc apps

Posted: 02 May 2002 ?? ?Print Version ?Bookmark and Share

Keywords:max1980? quick pwm? slave controller? dc converter controller? power supply controller?

Maxim Integrated Products has announced the availability of the MAX1980 step-down slave controller intended for use in low voltage, high-current, multiphase dc/dc applications such as those found in CPU core supplies, single- and two-stage converters, and notebooks PCs.

Synchronized to the master's low-side gate driver, the Quick-PWM device has a constant on-time controller with gate drivers for a synchronous rectifier, active-current balancing, and precision current-limit circuitry.

The MAX1980 slave controller can be combined with any of the company's dc/dc converters and balances inductor currents, as well as provide current-limit protection. This allows the slave controller to automatically enter standby mode when the master controller shuts down.

The controller also has a driver disable mode that forces both gate drivers (DL and DH) low. During this mode, the controller may operate in low-power skip mode, improving light-load efficiency.

Additionally, the MAX1980 includes selectable trigger polarity, allowing the slave control to trigger on the rising (out-of phase) or falling (in-phase) edge of the master's low-side gate driver. Out-of-phase operation staggers both the master's and slave's on-times, reducing the input ripple current and the number of input capacitors.

The MAX1980 features a selectable switching frequency of 200kHz, 300kHz, and 550kHz. It supports an input range from 4V to 28V, while drawing 525?A during operation and 52?A during standby.

The MAX1980 is available in a 20-pin, 5-by-5mm QFN package and is priced at $2.24 each in quantities of 1,000 pieces and up.

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