1. Products
  2. Power Monitor, Control, and Protection
  3. Hot Swap Controllers
  4. Low Voltage Hot Swap Controllers
  5. MAX16550B


Features and Benefits

  • Three Options:
    • MAX16550A: 30A Protection with 8A Startup
    • MAX16550B: 30A Protection with 16A Startup
  • High-Density (4mm x 4.5mm for 30A): Less than 25% of the Board Area of Conventional Solutions
    • Monolithic Integration of Power, Control, and Monitoring
    • Integrated Power MOSFET with 1.9mΩ Total Resistance in 12V Power Path (RDS(ON) Including Package)
    • Integrated Lossless, Precise Current Sensing
    • Integrated LDO Provides VDD Supply (1.8V Bias Suppy)
  • Enables Advanced System Power Management—PMBus/SMBus Telemetry with Extensive Status Monitoring and Reporting
    • Load Current Indicator (ILOAD) Pin Provides Analog Output Current Reporting with High Accuracy
    • Programmable Soft-Start for Inrush Current Limiting
    • Increases Power-Supply Reliability with IC Self-Protection Features
      • Very Fast Fault Detection and Isolation
      • VIN to VOUT Short Protection During Startup
      • Overtemperature Protection
    • Three Levels of Overcurrent Protection
      • Programmable Moderate OCP
      • Programmable Severe OCP Provides Isolation < 5µs
      • Fail-Safe Safe OCP Provides Isolation < 250ns

Product Details

The MAX16550A/MAX16550B are protection ICs with an integrated low-resistance MOSFET and lossless current-sense circuitry featuring SMBus/PMBus™ control and reporting. The ICs are designed to provide the optimum solution for distribution, control, monitoring and protection of the system’s 12V power supply. An internal LDO provides the supply voltage for the protection IC.

If no fault is detected, the ICs initiate the startup and have been designed to provide controlled, monotonic startup. Programmable soft-start ramp and delay is implemented to limit the in-rush current during startup.

The ICs monitor the current and voltage of the 12V system power rail and provide multiple levels of protection with fast turn-off if a fault is detected.

Maxim’s patented, lossless current sense provides high accuracy current sensing over load and temperature, improving overall system-energy efficiency, and reducing dissipation.

If, at any time, the output voltage falls below the programmable output undervoltage-lockout threshold, the PWRGD signal is asserted low. If at any time the input voltage falls below the programmable input undervoltage-lockout threshold, the PWRGD signal is asserted low.

See the Basic Application Circuit utilizing the MAX16550A/ MAX16550B ICs.


  • Circuit Breaker/E-Fuse, Hot Swap
  • Integrated Protection IC on 12V
  • Servers, Networking, Storage, Communication Equipment and AC/DC Power Supplies

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.

Evaluation Kits (2)

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Design Resources

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Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX16550BGPN+ Material Declaration Reliability Data 18-LFCSP-4X4.5X0.95
MAX16550BGPN+T Material Declaration Reliability Data 18-LFCSP-4X4.5X0.95
Wafer Fabrication Data

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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.