Analog Devices MAX17559

Description

The MAX17559 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 is 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 or latchoff limits MOSFET power dissipation under short-circuit conditions. The IC provides independent adjustable soft-start/stop 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, 7mm x 7mm, 32-pin TQFP, package.

Features

• 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
  • Fixed 180° Out-of-Phase Operation
  • Adjustable 100kHz to 2.2MHz Switching Frequency
  • Independent Enable and PGOOD
  • Available in a Lead(Pb)-Free 7mm x 7mm, 32-Pin TQFP 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/Stop or Tracking
  • Current Selectable Foldback or Latchoff Limits MOSFET Heat Dissipation During a Short-Circuit Condition
  • Operates Over the -40°C to +125°C Temperature Range
  • Output Overvoltage and Overtemperature Protections

Typical applications

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

More information

• Datasheet
• IC product information