Maxim Integrated MAX17558

Beschreibung

The MAX17558 is a dual-output, synchronous step-down controller that drives nMOSFETs. The device uses a constant-frequency, peak-current-mode architecture. The two outputs can be configured as independent voltage rails. Input capacitor size can be minimized 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 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.

Eigenschaften

• 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
• Selectable In-Phase or 180° Out-of-PhaseOperation
• Adjustable 100kHz to 2.2MHz Switching Frequency
• Independent Enable and PGOOD
• Available in a Lead(Pb)-Free 32-Pin, 5mm x 5mmTQFN-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 DissipationDuring a Short-Circuit Condition
• Operates Over the -40°C to +125°C TemperatureRange
• Output Overvoltage and Overtemperature Protections

Typische Anwendungen

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

Weiterführende Informationen

• Datenblatt
• Produktseite des IC-Herstellers