Quad DC/DC chip simplifies multi-rail telecom applications

Sunnyvale, Calif.—Maxim's MAX15022 quad-output DC/DC converter, for telecom/networking equipment, IP phones, RFID readers, and automotive multimedia systems, integrates two high-current synchronous DC/DC regulators (2 and 4 amps) and two linear controllers (1 amp with external output stages) to reduce the number of discrete components and board real estate required by traditional designs.

The regulators, which can operate up to 4 MHz, reduce inductor and capacitor size and thus lower solution cost. The linear controllers operate 180 degrees out of phase to reduce input ripple current and allow the use of smaller, less expensive input capacitors. The controllers have 20-mA sink capability to drive two PNP transistors.

The MAX15022 can externally compensate the switching regulators as well as adjust the output voltage over the range of 0.6 volt to the input voltage. The chip is capable of monotonic startup into a prebiased output. It has independent enable inputs with analog thresholds that allow for power sequencing during power-up and power-down. The device can be configured to provide coincident or ratiometric tracking of the converter's output voltage.

Other device features include digital soft-start/soft-stop, cycle-by-cycle lossless current sensing; hiccup-mode operation; and thermal protection.

Datasheet : Click here.

Pricing : The MAX15022, in a thermally enhanced 28-pin, 5-by-5 mm TQFN package and fully specified from -40 to +125°C, is priced starting at $3.07 (1000-up, FOB USA). Maxim offers an evaluation kit for the MAX15022. Contact the factory for availability.

Maxim Integrated Products , 1-800-998-8800,

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