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Maxim dc-dc converter suits notebook, sub-notebook PCs

Posted: 21 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? pulse-width-modulated? pwm? max1515?

Maxim Integrated Products released a constant-off-time, pulse-width-modulated (PWM), source/sink step-down dc-dc converter that is designed for use in low-voltage active-termination power rails or chipset power supplies in notebook and sub-notebook computers.

The new MAX1515 features dual internal, n-channel MOSFET power switches for high efficiency and reduced component count. The internal 40 milliohms NMOS power switches easily source and sink continuous load currents up to 3A, said the press release. The adjustable output range is 0.5V to 2.7V and achieves efficiencies as high as 95 percent. External Schottky diodes are not required.

The device can be configured as a DDR regulator, producing an output that is exactly half the memory supply rail. The input of the power stage can be taken from the memory supply rail itself, explained Maxim, resulting in an efficient power supply that returns the energy to the rail from which it was sourced.

The MAX1515 uses a current-mode, constant-off-time, PWM control scheme. A selectable pulse-skipping mode maintains high efficiency during light-load operation, yet still sources and sinks current on demand. This product can also be operated in fixed-PWM mode for low output ripple. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, which allows the user to optimize performance trade-offs among efficiency, output switching noise, component size and cost.

The new dc-dc converter is available in a 24-pin thin QFN package with an exposed backside pad. It is screened for the extended-industrial temperature range, with prices starting at $4.35 (1,000-up, FOB USA). A pre-assembled MAX1515EVKIT is available upon request.

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