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Maxim PWM power IC includes power MOSFETs

Posted: 13 Aug 2004 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max5074? pulse-width-modulation power ic? pwm power ic? mosfet?

The MAX5074 pulse-width-modulation (PWM) power IC from Maxim Integrated Products comes with integrated power MOSFETs. According to a press statement, the device is targeted at isolated power supplies for IEEE 802.3af-compliant, power-over-Ethernet (POE) and powered devices, and is ideal for converting -48V to 3.3V in power-sourcing equipment (POE), which includes switch/routers and midspans.

Other suitable applications include both flyback- and forward-converter isolated power supplies with a wide 11V to 6V input-voltage range and up to 15W output power.

The new PWM power IC provides a "look ahead" signal for driving secondary-side synchronous rectifiers, allowing for a greater than 90 percent efficiency without resorting to complicated drive schemes and additional discrete components. It includes thermal shutdown, and 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, Maxim added.

Rated for operation between the -40C to 125C temperature range, the MAX5074 is available in a thermally enhanced 20-pin TSSOP package that is capable of dissipating up to 1.74W at an ambient temperature of 70C. Prices start at $1.44 (1,000-up, FOB USA).

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