MAX16128:Load-Dump/Reverse-Voltage Protection Circuits

New Integrated Load-Dump Protectors and Limiters Ideal for Automotive, Industrial, and Telecom Applications

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
  • 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
    • Fixed Undervoltage/Overvoltage Thresholds
    • 3mm × 3mm, 8-Pin µMAX Package
  • Reduced Power Dissipation Compared to Discrete Solutions
    • Minimal Operating Voltage Drop for Reverse-Voltage Protection
    • 380µA Supply Current and 100µA Shutdown Current at 30V Input
MAX16128, MAX16129: Typical Operating Circuit
MAX16128, MAX16129: Typical Operating Circuit
Applications/Uses
  • Automotive
  • Avionics
  • Industrial
  • Telecom/Server/Networking
DataSheet
titleDownload file
MAX16128-MAX16129 Data SheetMAX16128-MAX16129.pdf
Parametrics
Part NumberChannelsVIN
(V)
VIN
(V)
Over Voltage Trip Level
(V)
Under Voltage Lockout
(V)
VGATE
(V)
Over Volt. FlagOper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX161281390Adjustable2.8
Adjustable
9Open-Drain-40 to +125µMAX/8$1.23 @1k
MAX16129µMAX/8
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX16128AUAACAC+ActiveuMAX;-40°C to +125°CSee data sheet
MAX16128UAACAC+ActiveµMAX,;8 pin;15.6 mm²-40°C to +125°CLead Free
MAX16128UAACAC+TActiveµMAX,;8 pin;15.6 mm²-40°C to +125°CLead Free
MAX16128UAADAA+ActiveµMAX,;8 pin;15.6 mm²-40°C to +125°CLead Free
MAX16128UAADAA+TActiveµMAX,;8 pin;15.6 mm²-40°C to +125°CLead Free
MAX16128-MAX16129.pdf MAX16129
MAX16128-MAX16129_cn.pdf MAX16129
MAX16128.pdf MAX16128
MAX16128-MAX16129_cn.pdf MAX16129