60V, dual-output, synchronous step-down controller for industrial PSUs

June 01, 2015 // By Graham Prophet
Maxim Integrated has posted details of the MAX17558, a dual-output, synchronous step-down controller that drives nMOSFETs. The device uses a constant-frequency, peak-current-mode architecture with wide input voltage range, offering flexibility for industrial applications

The device’s two outputs can be configured as independent voltage rails. Input capacitor size can be minimised by running the two outputs 180° out-of-phase. The IC supports current sensing using either an external current-sense resistor for accuracy or an inductor DCR for improved system efficiency. Current foldback limits MOSFET power dissipation under short-circuit conditions.

The IC provides independent adjustable soft-start for each output and can start up monotonically into a prebiased output. The IC can be configured in either PWM or DCM modes of operation, depending on whether constant-frequency operation or light-load efficiency is required. It operates over the -40°C to +125°C temperature range and comes in a 32-pin TQFN, 5 x 5 mm package with an exposed pad.

Maxim Integrated; www.maximintegrated.com/en/products/power/switching-regulators/MAX17558.html

next page; feature listing, and expanded application diagram...