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说明
The MAX17548 is a dual-output, synchronous step-down controller that drives nMOSFETs.
The device features a peak-current-mode, constantfrequency architecture, allowing it to operate up to 2.2MHz. The device can be configured as two singlephase, independent 10A power supplies or as a dualphase, 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.
关键特性
Wide Range of Operation
Wide 4.5V to 42V Input Voltage Range
Wide 0.8V to 24V Output Voltage Range
RSENSE 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
应用
电脑数控
DC动力系统分配
工业电源
运动控制
可编程逻辑控制器
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