Maxim Announces 4MHz, Dual-Switching DC-DC Converter With Dual Linear Controllers

Maxim Integrated Products introduced the MAX15022, a highly flexible quad-output dc-dc converter. The MAX15022 integrates dual synchronous dc-dc regulators (4A and 2A) and dual linear controllers to provide four outputs from a single IC. The integration of these regulators and controllers is said to reduce the number of discrete components required by traditional designs. Overall board space and cost are reduced, while the overall design is greatly simplified.

The MAX15022 can be used in a vast array of applications that require multiple voltages. Ideal applications include telecom/networking equipment, IP phones, RFID readers, and automotive multimedia systems.

The MAX15022’s integrated switches operate at frequencies from 500kHz to 4MHz, said to be a flexible benefit that reduces inductor and capacitor size and thus lowers solution cost. The integrated switches are also said to simplify design, reduce EMI, and improve reliability. The MAX15022 is said to deliver higher output current (up to 4A) while providing outstanding efficiency compared to a competitive high-frequency switching solution. With this high-switching-frequency capability, small output capacitors can be used with minimal output ripple.

The dual converters also operate 180 degrees out of phase, thus reducing the input ripple current and allowing smaller, less expensive input capacitors to be used. With 20mA sink capability, the two integrated linear controllers can drive two external, PNP transistors to provide two additional power rails that deliver over 1A of output current. The four outputs offer a compact solution for a quad-voltage rail application.

The MAX15022 can externally compensate the switching regulator as well as adjust the output voltage from 0.6V to the input voltage. It will also allow monotonic startup into a prebiased output. It has independent enable inputs with analog thresholds that allow for easy power sequencing during power-up and power-down. In addition, this device can be configured to track the converter output voltage coincidentally or ratiometrically, thus simplifying the design.

Other standard device features include: a digital soft-start/soft-stop, cycle-by-cycle lossless current sensing, hiccup-mode operation, and thermal protection. The MAX15022 is offered in a thermally enhanced 28-pin, 5 x 5mm TQFN package and is fully specified from -40 to +125°C.

Prices start at $3.07 (1000-up, FOB USA).