Features and Benefits

  • Pin- and Function-Compatible with the LT1641-2 (MAX5947B)
  • Provides Safe Hot Swap for +9V to +80V Power-Supply Range (MAX5947A/B/C)
  • Safe Board Insertion and Removal from Live Backplanes
  • Latched/Autoretry Management
  • Active-Low or Active-High Power-Good Output
  • Programmable Foldback Current Limiting
  • High-Side Drive for an External N-Channel MOSFET
  • Built-In Thermal Shutdown
  • Undervoltage Lockout (UVLO)
  • Overvoltage Protection
  • User-Programmable Supply Voltage Power-Up Rate

Product Details

The MAX5933A-MAX5933F/MAX5947A/B/C fully integrated hot-swap controllers for +9V to +80V positive supply rails (MAX5947A/B/C), allow for the safe insertion and removal of circuit cards into live backplanes without causing glitches on the backplane power-supply rail. The MAX5947B is pin- and function-compatible with the LT1641-2. The other devices offer added features such as a choice of active-high or active-low power-good outputs (PWRGD/PWRGD-bar), latched/autoretry fault management, and autoretry duty-cycle options of 3.75% or 0.94% (see the Selector Guide).

The MAX5933A-MAX5933F are available with a default undervoltage lockout threshold of +31V and operate over a supply voltage range of +33V to +80V. The MAX5947A/B/C are available with a default undervoltage of +8.3V. All devices feature a programmable analog foldback current limit. If the device remains in current limit for more than a programmable time, the external n-channel MOSFET is either latched off (MAX5933A/MAX5933C/MAX5947A) or is set to automatically restart after a timeout delay (MAX5933B/MAX5933D/MAX5933E/MAX5933F/MAX5947B/MAX5947C).

The MAX5933_ and MAX5947_ operate in the extended temperature range of -40°C to +85°C. These devices are available in an 8-pin SO package.


  • 24V/48V Industrial/Alarm Systems
  • Electronic Circuit Breakers
  • Hot Board Insertion
  • Industrial High-Side Switch/Circuit Breakers
  • Network Routers and Switches

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.

Product Recommendations

MAX5947 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

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