The MAX17548 is a dual-output, synchronous step-down controller that drives nMOSFETs.
The device features a peak-current-mode, constant frequency architecture, allowing it to operate up to 2.2MHz. The device can be configured as two single-phase, independent 10A power supplies or as a dualphase, single-output 20A power supply. The device also provides the ability to run two controllers 180° out-of-phase to reduce the power loss and noise due to the input-capacitor ESR.
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 desired.
The IC operates over the -40°C to +125°C temperature range and is available in a lead(Pb)-free, 32-pin TQFN, 5mm x 5mm package with an exposed pad.
Applications
Computerized Numerical Control
Distributed DC Power Systems
Industrial Power Supplies
Motion Control
Programmable Logic Controllers
Features and Benefits
Wide Range of Operation
RSENSE or Inductor DCR Current Sensing
Selectable In-Phase or 180° Out-of-Phase Operation
Adjustable 100kHz to 2.2MHz Switching Frequency
Independent Enable and PGOOD
Available in a Lead(Pb)-Free 32-Pin, 5mm x 5mm TQFN-EP Package
Enhances Power Efficiency