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Power supply integrated MOSFETs

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article image Targeted at isolated power supplies.

MAXIM Integrated Products, represented by Arrow Electronics , has introduced the MAX5074, a pulse-width-modulation (PWM) power IC with integrated power MOSFETs.

The device is targeted at isolated power supplies for IEEE 802.3af-compliant, power-over-Ethernet (POE), powered devices (PDs) such as IP phones, WLAN access points, and IP cameras.

The MAX5074 is also ideal for converting -48V to +3.3V in power-sourcing equipment (POE), which includes switch/routers and midspans.

The device can be used in both flyback- and forward-converter isolated power supplies with a wide ±11V to ±76V input-voltage range and up to 15W output power.

The MAX5074 provides a "look ahead" signal for driving secondary-side synchronous rectifiers, thus allowing greater than 90% efficiency without resorting to complicated drive schemes and additional discrete components.

The device includes thermal shutdown. It provides continuous short-circuit protection with hiccup-mode current limit, which reduces power dissipation under persistent overload conditions.

The switching frequency is resistor-/capacitor-programmable up to 500kHz, thus allowing the use of smaller external magnetics and capacitors.

These features, together with the integrated MOSFETs, reduce power-supply size and cost for POE applications.

Rated for operation over a wide -40 degrees Celsius to +125 degrees Celsius temperature range, the MAX5074 is available in a thermally enhanced 20-pin TSSOP package capable of dissipating up to 1.74W at 70 degrees Celsius ambient temperature.

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