Features and Benefits

  • Two Independent Hot-Swap Controllers Operate from 0V to +16V
  • 10-Bit ADC Monitors Voltage and Current of Each Channel
  • Circular Buffers Store 5ms of Current and Voltage Measurements
  • Two Independent Internal Charge Pumps Generate n-Channel MOSFET Gate Drives
  • Internal 500mA Gate Pulldown Current for Fast Shutdown
  • VariableSpeed/BiLevel™ Circuit-Breaker Protection
  • Independent Precision-Voltage Enable Inputs
  • Alert Output Indicates Fault and Warning Conditions
  • Independent Power-Good Outputs
  • Independent Fault Outputs
  • Four Open-Drain Outputs Sink 25mA to Directly Drive LEDs
  • Programmable LED Flashing Function
  • Autoretry or Latched Fault Management
  • 400kHz I²C Interface
  • Small 6mm x 6mm, 36-Pin TQFN-EP Package

Product Details

The MAX5970 dual hot-swap controller provides complete protection for systems with two supply voltages from 0V to +16V. The MAX5970 includes four programmable LED outputs. The two hot-swap channels can be configured to operate as independent hot-swap controllers, or as a pair operating together so that both channels shut down if either channel experiences a fault.

The MAX5970 provides two programmable levels of overcurrent circuit-breaker protection: a fast-trip threshold for a fast turn-off, and a lower slow-trip threshold for a delayed turn-off. The maximum overcurrent circuit-breaker threshold range is set independently for each channel with a trilevel logic input IRNG_, or by programming though the I²C interface.

The MAX5970 is an advanced hot-swap controller that monitors voltage and current with an internal 10-bit ADC which is continuously multiplexed to convert the output voltage and current of both hot-swap channels at 10ksps. Each 10-bit sample is stored in an internal circular buffer so that 50 past samples of each signal can be read back through the I²C interface at any time or after a fault condition.

The device includes five user-programmable digital comparators per hot-swap channel to implement overcurrent warning and two levels of overvoltage/undervoltage detection. When any of the measured values violates the programmable limits, an external active-low ALERT output is asserted. In addition to the active-low ALERT signal, the MAX5970 can be programmed to deassert the power-good signal and/or turn off the external MOSFET.

The MAX5970 features four I/Os that can be independently configured as general-purpose inputs/outputs (GPIOs) or as open-drain LED drivers with programmable blinking. These four I/Os can be configured for any mix of LED driver or GPIO function.

The MAX5970 is available in a 36-pin thin QFN-EP package and operates over the -40°C to +85°C extended temperature range.


  • Blade Servers
  • Disk Drives/DASD/Storage Systems
  • Single PCI Express® Hot-Plug Slot
  • Soft-Switch for ASICs, FPGAs, and Microcontrollers with Independent Core and I/O Voltages

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.