General Description

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 (FLAG) that asserts during fault conditions.

Benefits and Features

Operates Down to +3V, Riding Out Cold-Crank Conditions

-30V to +90V Wide Input Voltage Protection Range

Minimal Operating Voltage Drop Reverse-Voltage Protection

Fast Gate Shutoff During Fault Conditions with Complete Load Isolation

Adjustable Undervoltage/Overvoltage Thresholds

Thermal Shutdown Protection

Low Supply Current and Low Shutdown Current

Charge-Pump Circuit Enhances External n-Channel MOSFETs

FLAG Output Identifies Fault Condition

Automotive Qualified

-40NC to +125NC Operating Temperature Range

Available in 3mm x 3mm, 12-Pin TQFN Package