Circuit Protection Misc Over Voltage Protection

The MAX16126TCA/V+ 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 (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 MAX16126TCA/V+ use external resistors to adjust the overvoltage and under voltage comparator thresholds for maximum flexibility. The MAX16126TCA/V+ provides switch-mode fault management for overvoltage and thermal shutdown conditions. In the limiter mode, the output voltage is limited and FLAG\ is asserted low during a fault. In the switch mode, the external MOSFETs are switched off and FLAG\ is asserted low after a fault. The switch mode is available in four options: latch mode, 1 auto retry mode, 3 auto retry mode, and always auto retry mode. The MAX16126TCA/V+ are available in 12-pin TQFN packages. These devices operate over the automotive temperature range (-40°C to +125°C).

• 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
• Adjustable Under voltage/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