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Load-Dump/Reverse-Voltage Protection Circuits
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.
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 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 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).
Benefits and 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
• -40°C to +125°C Operating Temperature Range
●● Integration Reduces Solution Size
• Internal Charge-Pump Circuit Enhances External
• Adjustable Undervoltage/Overvoltage Thresholds
• 3mm x 3mm, 12-Pin TQFN Package
●● Reduced Power Dissipation Compared to Discrete
• Minimal Operating Voltage Drop for Reverse-
• 350μA (max) Supply Current and 100μA (max)
Shutdown Current at 30V Input
Ordering Information appears at end of data sheet.
19-6053; Rev 9; 9/18