The MAX17557 is a synchronous step-down controller that drives nMOSFETs. The device uses a constant-frequency, peak-current-mode architecture. 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 can start up monotonically into a prebiased output. The device can be operated in forced pulse-width modulation (PWM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and light-load conditions. The device features a programmable soft-stop enable (SSTPEN) or disable function. The IC operates over the -40°C to +125°C temperature range and is available in a lead (Pb)-free, 20-pin TQFN, 4mm x 4mm package with an exposed pad. Applications * Computerized Numerical Control * Distributed DC Power Systems * Industrial Power Supplies * Motion Control * Programmable Logic Controllers * Wide Range of Operation * Wide 4.5V to 60V Input Voltage Range * Wide 0.8V to 24V Output Voltage Range * RSENSE or Inductor DCR Current-Sensing * 100kHz to 2.2MHz Adjustable Frequency with External Clock Synchronization * Available in a Lead (Pb)-Free 20-Pin, 4mm x 4mm 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 * Programmable Soft-Stop Enable or Disable Function * Adjustable Soft-Start * Current Foldback Limits MOSFET Heat Dissipation During a Short-Circuit Condition * Overtemperature Protection * High Industrial Ambient Operating Temperature Range (-40°C to +125°C) and Junction Tempera- ture Range (-40°C to +150°C) https://elecena.pl/product/22318913/4-5v-to-60v-synchronous-step-down-controller 2022-12-27 https://elecena.pl/product/22318913/4-5v-to-60v-synchronous-step-down-controller 2025-01-21