MAXIM MAX17557ATP+T

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×4mm package with an exposed pad.

• 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
• Low - Impedance Gate Drives for High Efficiency
• DCM Operation at Light Loads
• Auxiliary Bootstrap LDO
• 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 Temperature Range (-40°C to +150°C)

• Industrial Power Supplies
• Distributed DC Power Systems
• Motion Control
• Programmable Logic Controllers
• Computerized Numerical Control