MAX15026CETD+

MAXIM INTEGRATED PRODUCTS  MAX15026CETD+  DC/DC Controller, Synchronous Buck Step Down, 4.5 V to 28 V, 1 Output, 2 MHz, TDFN-14 新

The is a low cost, small, DC to DC synchronous buck controller in 14 pin TDFN package. The device operates from a 4.5V to 28V input voltage range and generates an adjustable output voltage from 85% of input voltage down to 0.6V while supporting loads up to 25A. It allows monotonic start-up into a prebiased bus without discharging output and features adaptive internal digital soft-start. The MAX15026 offers ability to adjust switching frequency from 200KHz to 2MHz with an external resistor. An adaptive synchronous rectification eliminates the need for an external freewheeling schottky diode. The device also utilizes external low side MOSFET"s on-resistance as a current sense element eliminating the need for a current sense resistor. This protects DC to DC components from damage during output overloaded conditions or output short circuit faults without requiring current sense resistor. Hicc-up mode current limit reduces power dissipation during short circuit conditions.

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Sink mode current limit and thermal shutdown

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Provides additional margin for break before make times

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Provides soft-stop feature to ramp down the output voltage at turn-off

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Maximum duty cycle of 88% at fSW = 600KHz

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±1% accurate voltage reference internal boost diode

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Hiccup-mode short circuit protection

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Power good output and enable input for power sequencing

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±5% accurate enable input threshold

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Quiescent supply current of 1.75mA at VFB = 0.9V, no switching

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Operating temperature range from -40°C to +85°C