60V, dual-output, synchronous step-down controller for industrial PSUs
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…
MAX17558: Features
Wide range of operation
4.5V to 60V input voltage range
0.8V to 24V output voltage range
RSENSE or inductor DCR current-sensing
Selectable In-phase or 180° out-of-phase operation
Adjustable 100 kHz to 2.2 MHz switching frequency
Independent enable and PGOOD
Available in a lead(Pb)-Free 32-pin, 5mm x 5mm TQFN-EP package
Enhances power efficiency
Low impedance gate drives for high efficiency
DCM operation at light loads
Auxiliary bootstrap LDO
Operates reliably in adverse industrial environments
Independent adjustable soft-start or tracking
Current foldback limits MOSFET heat dissipation during a short-circuit condition
Operates over the -40°C to +125°C temperature range
Output overvoltage and overtemperature protections
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