42V, dual-output, synchronous step-down controller for industrial designs
The device features a peak-current-mode, constant frequency architecture, allowing it to operate up to 2.2 MHz. 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. Each controller drives two external logic-level n-channel MOSFETs.
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 comes in a 32-pin TQFN, 5 x 5mm package with an exposed pad.
Features include;
Wide range of operation;
4.5V to 42V 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
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
An accompanying evaluation kit, MAX17548 EV kit provides a proven design that provides 5V/5A and 3.3V/10A at the outputs from a 6V to 42V input supply. The switching frequency of the EV kit is preset to 350 kHz for optimal efficiency and component size. The EV kit features adjustable input undervoltage-lockout and soft-start time, selectable PWM/DCM modes, 180° out-of-phase/0° in-phase operation, current-limit threshold, and independent open-drain PGOOD signals.
Maxim Integrated; www.maximintegrated.com/en/products/MAX17548
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