MAX17559 Datasheet, PDF (1/28 Pages) Maxim Integrated Products – 60V, Dual-Output, Synchronous Step-Down Controller

MAX17559
EVALUATION KIT AVAILABLE
60V, Dual-Output, Synchronous
Step-Down Controller
General 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.
Applications
●● Industrial Power Supplies
●● Distributed DC Power Systems
●● Motion Control
●● Programmable Logic Controllers
●● Computerized Numerical Control
Benefits and Features
●● Wide Range of Operation
• Wide 4.5V to 60V Input Voltage Range
• Wide 0.8V to 24V Output Voltage Range
• R_SENSE 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
Ordering Information appears at end of data sheet.
19-7660; Rev 0; 6/15