Maxim推出MAX16128/MAX16129抛负载/反向电压保护电路

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).

Key Features

Operates Down to +3V, Riding Out Cold-Crank Conditions -36V to +90V Wide Input-Voltage Protection Range Minimal Operating Voltage Drop Reverse-Voltage Protection Fast Gate Shutoff During Fault Conditions with Complete Load Isolation Fixed Undervoltage/Overvoltage Thresholds Thermal Shutdown Protection Low Supply Current and Low Shutdown Current Internal Charge-Pump Circuit Enhances External n-Channel MOSFET Active-Low FLAG Output Identifies Fault Condition Automotive Qualified -40°C to +125°C Operating Temperature Range Available in 3mm × 3mm, 8-Pin µMAX Package