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Programmable, 4A, USB, Current-Limited Switches with Autoreset and Fault Blanking

Smallest Programmable, 4A, Current-Limited USB Switch with Autoreset and Fault Blanking Half the Size of Competitors

Product Details

Key Features

Parametric specs for Current Limit and USB Power Switches
Current Limit (mA) (min) 1000
Current Limit (mA) (max) 4000
# Power Switches 1
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 20
Current Limit Set By Resistor
Lowest Adj. Setting (A) 1
RON (Ω) (typ) 0.026
VSUPPLY (V) (min) 4
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins See Data Sheet
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Simplified Block Diagram

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Parameters

Parametric specs for Current Limit and USB Power Switches
Current Limit (mA) (min) 1000
Current Limit (mA) (max) 4000
# Power Switches 1
USB Yes
Fault Indicator Yes
Current Limit Accuracy (%) 20
Current Limit Set By Resistor
Lowest Adj. Setting (A) 1
RON (Ω) (typ) 0.026
VSUPPLY (V) (min) 4
VSUPPLY (V) (max) 5.5
Oper. Temp. (°C) -40 to +85
Package/Pins See Data Sheet

Key Features

  • Programmable Current Limit (1A to 4A) with Resistor
  • Autoreset Feature Saves System Power
  • 20ms Fault-Blanking Circuitry
  • Active-High/Low Control Logic
  • Fault-Indicator Output
  • Thermal-Overload Protection
  • Smaller 4mm x 4mm Thin QFN Package (MAX1563)
  • 3µA Shutdown Current

Applications/Uses

  • Desktop Computers
  • Docking Stations
  • Notebook Computers
  • PDAs and Palmtop Computers
  • USB Ports and Hubs

Description

The MAX1562/MAX1562H/MAX1563 single current-limited switches provide up to 4A to power up to eight USB ports. They operate from a 4V to 5.5V input supply and consume only 40µA of quiescent current when operating and only 3µA in shutdown.

The MAX1562/MAX1562H/MAX1563s' autoreset feature latches the switch off if the output is shorted, thereby saving system power. When the short is removed, the switch is reactivated. A fault-blanking feature enables the circuit to ignore momentary faults, such as those caused when hot swapping a capacitive load, preventing false alarms to the host system. Fault blanking also prevents fault signals from being issued when the device powers up the load.

The MAX1562/MAX1562H/MAX1563 provide several safety features to protect the USB port. Built-in thermal-overload protection turns off the switch when the die temperature exceeds +160°C. Accurate internal current-limiting circuitry protects the input supply against both overload and short-circuit conditions. An open-drain fault signal (FAULT) notifies the microprocessor when a thermal-overload, current-limit, undervoltage lockout (UVLO), or short-circuit fault occurs.

The MAX1562 has an active-low ON, and the MAX1562H has an active-high ON enable input. The MAX1563 has a selectable active-high or active-low, logic-controlled enable. The current limit is programmed from 1A to 4A using a resistor.

The MAX1562/MAX1562H are available in 8-pin SO packages and are pin-compatible upgrades to the MIC2545A/MIC2549A. The MAX1563 provides the same features and higher current performance in a smaller 12-pin (4mm x 4mm) Thin QFN package. These devices operate over an extended temperature range (-40°C to +85°C). An evaluation kit is available to speed designs.

Simplified Block Diagram

MAX1562, MAX1562H, MAX1563: Typical Operating Circuit MAX1562, MAX1562H, MAX1563: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .