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Integrated Protection IC on 12V Bus with an Integrated MOSFET, Lossless Current Sensing, and PMBus Interface

Industry's First 60A Protection IC with Integrated MOSFET

Product Details

Key Features

Applications/Uses

Parametric specs for Hot Swap Controllers
VIN (V) (min) 10.8
VIN (V) (max) 13.2
# Channels 1
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) Adjustable
Fault Condition Control Programmable
Positive/Negative Rail Positive
Features Adjustable Current Limit Fault Delay
Analog Current Report Output
Integrated MOSFET
Internal I2C ADC Measures Current and Voltage
Programmable Soft start
Programmable UVLO/Inrush Current Regulated at Startup with SOA Control
Requires No RSENSE
Undervoltage/Overvoltage Protection
Package/Pins FCQFN/22
Budgetary
Price (See Notes)
6.27
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Simplified Block Diagram

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Parameters

Parametric specs for Hot Swap Controllers
VIN (V) (min) 10.8
VIN (V) (max) 13.2
# Channels 1
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) Adjustable
Fault Condition Control Programmable
Positive/Negative Rail Positive
Features Adjustable Current Limit Fault Delay
Analog Current Report Output
Integrated MOSFET
Internal I2C ADC Measures Current and Voltage
Programmable Soft start
Programmable UVLO/Inrush Current Regulated at Startup with SOA Control
Requires No RSENSE
Undervoltage/Overvoltage Protection
Package/Pins FCQFN/22
Budgetary
Price (See Notes)
6.27

Key Features

  • High Density (6.5mm × 4mm for 60A): Less than 25% of the Board Area of Conventional Solutions
    • Monolithic Integration of Power, Control, and Monitoring (Integrated Power MOSFET with 0.95mΩ Total Resistance in 12V Power Path (RDSON), Including Package)
    • Integrated Lossless, Precise Current Sensing
    • Integrated LDO Provides VDD Supply (1.8V Bias Supply)
  • 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.

Applications/Uses

  • Integrated Protection IC on 12V: Circuit Breaker, Hot Swap, Inrush Control
  • Servers, Networking, Storage, Communication Equipment and AC/DC Power Supplies

Description

The MAX16545B/C is a circuit-breaker protection IC with an integrated low-resistance MOSFET and lossless current-sense circuitry featuring PMBus™ /SMBus control and reporting. The IC is designed to provide the optimum solution for distribution, control, monitoring and protection of the system’s 12V power supply. An internal LDO provides the bias supply voltage for the protection IC.

If no fault is detected, the MAX16545B/C initiates the startup. The device has been designed to provide controlled, monotonic startup. Programmable soft-start ramp and delay is implemented to limit the inrush current during startup. The MAX16545B is set for 16A Startup OCP, and the MAX16545C is set for 24A Startup OCP.

The IC monitors the current and the voltage of the 12V system power rail and provides multiple levels of protection with fast turn off if a fault is detected. Three methods of overcurrent protection are provided. Programmable moderate OCP level allows surge currents for a limited time. User-selectable severe OCP level provides a fast disconnect if a current exceeding the severe OCP threshold is detected. An additional fixed high shutdown OCP level provides instantaneous disconnect to further protect the device.

The lossless current sense provides high-accuracy current sensing over load and temperature, improving overall system energy efficiency, and reducing dissipation. A signal proportional to the load current is reported through an analog output and extensive reporting is provided through the SMBus/PMBus.

Output voltage is monitored at all times. 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. The MAX16545B/C can be programmed through PMBus to provide input overvoltage protection. Input overvoltage protection is disabled by default. When enabled through PMBus, if the input voltage exceeds a programmable overvoltage threshold, the MOSFET is latched off and a fault is communicated.

The IC is used to distribute and control power to a system from the +12V power supply.

Simplified Block Diagram

MAX16545B, MAX16545C: Basic Application Circuit MAX16545B, MAX16545C: Basic Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .