Maxim Integrated MAX17559 | Demoboard MAXREFDES103

Description

The MAX17559 is a dual-output, synchronous step-downcontroller that drives nMOSFETs. The device uses aconstant-frequency, peak-current-mode architecture. Thetwo outputs can be configured as independent voltagerails. Input capacitor size is minimized by running the twooutputs 180° out of phase. The IC supports current sensingusing either an external current-sense resistor for accuracyor an inductor DCR for improved system efficiency. Currentfoldback or latch-off limits MOSFET power dissipationunder short-circuit conditions. The IC provides independentadjustable soft-starts/stops for each output and can startup monotonically into a pre-biased output. The IC can beconfigured in either PWM or DCM modes of operation,depending on whether constant-frequency operation orlight-load efficiency is desired. The IC operates over the-40°C to +125°C temperature range and is available in alead(Pb)-free, 7mm x 7mm, 32-pin TQFP, package.

Features

Wide 4.5V to 60V Input Voltage RangeWide 0.8V to 24V Output Voltage RangeRSENSE or Inductor DCR Current-SensingFixed 180° Out-of-Phase OperationAdjustable 100kHz to 2.2MHz Switching FrequencyIndependent Enable and PGOODAvailable in a Lead(Pb)-Free 7mm x 7mm, 32-Pin TQFP PackageEnhances Power EfficiencyLow-Impedance Gate Drives for High EfficiencyDCM Operation at Light LoadsAuxiliary Bootstrap LDOOperates Reliably in Adverse Industrial EnvironmentsIndependent Adjustable Soft-Start/Stop or TrackingCurrent Selectable Foldback or Latch-off LimitsMOSFET Heat Dissipation During a Short-Circuit ConditionOperates Over the -40°C to +125°C Temperature RangeOutput Overvoltage and Overtemperature Protections

Typical applications

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

More information

• IC product information