MAX17558 Datasheet, PDF (1/28 Pages) Maxim Integrated Products – Enhances Power Efficiency

MAX17558
EVALUATION KIT AVAILABLE
60V, Dual-Output, Synchronous
Step-Down Controller
General Description
The MAX17558 is a dual-output, synchronous step-down
controller that drives nMOSFETs.
The device features a peak-current-mode, constant-
frequency architecture, allowing it to operate up to
2.2MHz. The device can be configured as two single-
phase, independent 10A power supplies or as a dual-
phase, single-output 20A power supply. The device also
provides the ability to run two controllers 180° out-of-
phase to reduce the power loss and noise due to the
input-capacitor ESR.
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.
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
• Selectable In-Phase or 180° Out-of-Phase
Operation
• Adjustable 100kHz to 2.2MHz Switching Frequency
• Independent Enable and PGOOD
• Available in a Lead(Pb)-Free 32-Pin, 5mm x 5mm
TQFN-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 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.
19-7532; Rev 1; 3/16