MAX22518

RECOMMENDED FOR NEW DESIGNS

Self-Powered, Two-Channel, 3.5kVRMS Digital Isolator

Simplifies Isolated Diagnostic Monitoring

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • Robust Protection in Small Footprint
    • Integrated Isolated Field-Side Supply
    • Integrated Galvanic Digital Isolation
    • Integrated Surge and Short Protection with External Series Resistor
      • 24VAC Short Protection
      • ±1kV Line-to-Ground and ±2kV Line-to-Line Surge Tolerance (1.2/50µs Waveform)
    • Compact 8-Pin Wide-Body SOIC Package (5.5mm Creepage)
  • Robust Galvanic Isolation of Digital Signals
    • 3.5kVRMS Isolation Voltage for 60s (VISO)
    • 445VRMS Continuous Working Voltage (VIOWM)
  • Design Flexibility
    • 220μA Field-Side Supply External Load Capability
    • 3V to 5.5V Logic-Side Supply
    • -40°C to +125°C Operating Temperature Range

The MAX22517–MAX22519 are dual-channel digital galvanic isolators with integrated field-side supply using Maxim's proprietary process technology. The field-side power is supplied by the logic-side using an integrated isolated DC-DC converter. This approach eliminates the bulky and expensive external isolated power supply when the power demand of the field side is small. All of the devices in the family feature basic isolation with a withstand voltage rating of 3.5kVRMS for 60s or 445VRMS of continuous operation. With a single resistor on each input, the inputs of the MAX22517–MAX22519 can withstand 1.2/50µs surge pulses up to ±2kV between inputs (common mode) or up to ±1kV between input and field ground (differential), as well as continuous shorts to 24VAC. The MAX22517–MAX22519 provide compact, reliable, and cost-efficient solutions for applications such as industrial IoT, industrial networking systems, and building automation.

Both sides of the isolators are powered from a single 3.0V to 5.5V supply on the logic side, which also sets the output logic level. Both channels of the MAX22517–MAX22519 transfer data from the field side to the logic side and are always enabled. Each output is high when the corresponding input is high and low when the corresponding input is low.

Devices are available with either push-pull or open-drain outputs, and output default states are either logic-high (push-pull version) or high impedance (open-drain versions). The default is the state the output assumes when either power domain of the device is undervoltage or the input is open circuit. See the Ordering Information for the part numbers associated with each option.

All of the devices in the MAX22517–MAX22519 family are available in a 8-pin wide-body SOIC package with 5.5mm of creepage and clearance. The package material has a minimum comparative tracking index (CTI) of 400, which gives it a group II rating in creepage tables. All devices are rated for operation at ambient temperatures of -40°C to +125°C.

Applications

  • Industrial IoT
  • Industrial Networking Systems
  • Building Automation
  • Medical Equipment
MAX22518
Self-Powered, Two-Channel, 3.5kVRMS Digital Isolator
MAX22517, MAX22518, MAX22519: Functional Diagrams
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Documentation

Data Sheet 1

Safety and Regulatory Compliance 1

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Tools & Simulations

IBIS Model 1

Evaluation Kits

eval board
schematic 1
MAX22518EVKIT

Evaluation Kit for the MAX22517/MAX22518/MAX22519

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Features and Benefits

  • Self-Generated Isolated Field-Side Supply VDDF
  • 2 Unidirectional Channels with Input Charge Pumps (MAX22517 and MAX22518) and Open-Drain Outputs (MAX22518 and MAX22519)
  • Surge and Short Protection with Onboard Components
    • 24VAC Short Protection
    • ±1kV Line-to-Ground and ±2kV Line-to-Line Surge Tolerance (1.2/50µs Waveform)
  • Terminal Blocks and Test Points for Easy Connection to External Equipment
  • Single Logic-Side Supply VDDL, Range from 3V to 5.5V
  • Guaranteed Up to 3.5kVRMS Isolation for 60s
  • -40°C to +125°C Temperature Range
  • Proven PCB Layout

Product Details

The MAX22518 evaluation kit (EV kit) provides a proven design to evaluate the MAX22517–MAX22519 family of self-powered, dual-channel, 3.5kVRMS digital isolators. The EV kit allows easy access to both channels through either terminal blocks or test points. The isolated field-side supply VDDF can also be accessed using the test points. The EV kit includes necessary external components to demonstrate the device’s surge performance (1.2/50µs) up to ±1kV between input and field ground (differential), or up to ±2kV between inputs (common mode).

The MAX22518 EV kit is designed to support all three variants in the MAX22517–MAX22519 family. Jumpers on the logic-side outputs (OUT1L and OUT2L) allow to connect or disconnect the pullup resistors, depending on whether U1 has open-drain or push-pull outputs. The evaluation board comes with the wide-body 8-pin SOIC package type with 5.5mm creepage and clearance. See Table 1 for EV kit details.

The MAX22518 EV kit (MAX22518EVKIT#) is fully assembled and tested, and comes populated with the MAX22518AWA+ (Figure 1). The board also supports the MAX22517AWA+ and MAX22519AWA+, but requires the user to replace U1. See Table 1 and Evaluate MAX22517 and MAX22519 on MAX22518EVKIT# section for details.

The EV kit is powered from a single power supply on the logic side, VDDL, in range from 3V to 5.5V. The field-side supply, VDDF, is generated by the device and has a nomi- nal voltage of 3.3V. The logic-side ground (GNDL) and field-side ground (GNDF) are isolated and can have con- tinuous working voltage difference up to 445VRMS. For evaluating the electrical parameters of the devices without any isolation between the two sides, a common ground can be shared between GNDL and GNDF.

Note: When ordering an EV kit, if the desired device is not the MAX22518AWA+, request samples of the desired MAX22517–MAX22519 IC that can be soldered to the PCB.

Applications

  • Building Automation
  • Industrial IoT
  • Industrial Networking Systems
  • Medical Equipment
MAX22518EVKIT
Evaluation Kit for the MAX22517/MAX22518/MAX22519
MAX22518EVKIT: Board Photo

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