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Load-Dump/Reverse-Voltage Protection Circuits

New Integrated Load-Dump Protectors and Limiters Ideal for Automotive, Industrial, and Telecom Applications

Product Details

Key Features

Parametric specs for Overvoltage Protection Controllers
# Channels 1
VIN (V) (min) 3
VIN (V) (max) 90
Over Voltage Trip Level (V) Adjustable
Under Voltage Lockout (V) Adjustable
VGATE (V) 9
Over Volt. Flag Open-Drain
Oper. Temp. (°C) -40 to +125
Package/Pins UMAX/8
Budgetary
Price (See Notes)
1.51
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Simplified Block Diagram

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Parameters

Parametric specs for Overvoltage Protection Controllers
# Channels 1
VIN (V) (min) 3
VIN (V) (max) 90
Over Voltage Trip Level (V) Adjustable
Under Voltage Lockout (V) Adjustable
VGATE (V) 9
Over Volt. Flag Open-Drain
Oper. Temp. (°C) -40 to +125
Package/Pins UMAX/8
Budgetary
Price (See Notes)
1.51

Key Features

  • Increases Protection of Sensitive Electronic Components in Harsh Environments
    • -36V to +90V Wide Input-Voltage Protection Range
    • Fast Gate Shutoff During Fault Conditions with Complete Load Isolation
    • Thermal Shutdown Protection
    • Active-Low FLAG Output Identifies Fault Condition
  • Automotive Qualified
    • Operates Down to +3V, Riding Out Cold-Crank Conditions
    • -40°C to +125°C Operating Temperature Range
  • Integration Reduces Solution Size
    • Internal Charge-Pump Circuit Enhances External n-Channel MOSFET
    • Fixed Undervoltage/Overvoltage Thresholds
    • 3mm × 3mm, 8-Pin &microMAX Package
  • Reduced Power Dissipation Compared to Discrete Solutions
    • Minimal Operating Voltage Drop for Reverse-Voltage Protection
    • 380&microA Supply Current and 100&microA Shutdown Current at 30V Input

    Applications/Uses

    • Automotive
    • Avionics
    • Industrial
    • Telecom/Server/Networking

    Description

    The MAX16128/MAX16129 load-dump/reverse-voltage protection circuits protect power supplies from damaging input-voltage conditions, including overvoltage, reverse-voltage, and high-voltage transient pulses. Using a built-in charge pump, the devices control two external back-to-back n-channel MOSFETs that turn off and isolate downstream power supplies during damaging input conditions, such as an automotive load-dump pulse or a reverse-battery condition. Operation is guaranteed down to 3V that ensures proper operation during automotive cold-crank conditions. These devices feature a flag output (active-low FLAG) that asserts during fault conditions.

    For reverse-voltage protection, external back-to-back MOSFETs outperform the traditional reverse-battery diode, minimizing the voltage drop and power dissipation during normal operation.

    The devices use fixed overvoltage and undervoltage thresholds, minimizing the external component count.

    The MAX16129 provides limiter-mode fault management for overvoltage and thermal-shutdown conditions; whereas the MAX16128 provides switch-mode fault management for overvoltage and thermal shutdown conditions. In the limiter mode, the output voltage is limited and active-low FLAG is asserted low during a fault. In the switch mode, the external MOSFETs are switched off and active-low FLAG is asserted low after a fault. The switch mode is available in four options—Latch mode, 1 Autoretry mode, 3 Autoretry mode, and Always autoretry mode.

    The MAX16128/MAX16129 are available in an 8-pin µMAX® package and operate over the automotive temperature range (-40°C to +125°C).

    Simplified Block Diagram

    MAX16128, MAX16129: Typical Operating Circuit MAX16128, MAX16129: 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 .