New Product Introduction

Maxim Integrated MAX16126/MAX16127

MAX16126/MAX16127 - protect power-supply inputs from automotive voltage transients, including load dump

Maxim Integrated MAX16126/MAX16127 chip image

The MAX16126/MAX16127 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 to ensure 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 MAX16126/MAX16127 use external resistors to adjust the overvoltage and undervoltage comparator thresholds for maximum flexibility.

The MAX16127 provides limiter-mode fault management for overvoltage and thermal shutdown conditions; whereas the MAX16126 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 MAX16126/MAX16127 are available in 12-pin TQFN packages. These devices operate over the automotive temperature range (-40°C to +125°C).

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
  • AEC-Q100 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 MOSFETs
    • Adjustable Undervoltage/Overvoltage Thresholds
    • 3mm x 3mm, 12-Pin TQFN Package
  • Reduced Power Dissipation Compared to Discrete Solutions
    • Minimal Operating Voltage Drop for Reverse- Voltage Protection
    • 350µA (max) Supply Current and 100µA (max) Shutdown Current at 30V Input


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

Block diagram

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