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Power protection and control ICs are used to monitor the input voltage to a load to ensure it is within specified bounds. If an out-of-bounds level is detected, a protection and control IC can either regulate the voltage or current, or switch off the power source to protect the load from damage. Reverse-voltage protection prevents system damage when the input voltage is accidentally reversed or when the output voltage is shorted to a higher voltage rail.

Power protection and control ICs offer a range of functions from load switching, such as with USB power switches, to fully configurable overcurrent, overvoltage, and undervoltage monitoring. Specialized protection and control circuits manage redundant power systems and in-rush current for hot board insertion applications.

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Power Protection Fundamentals
27:22 April 22, 2019

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MAX16171 Ideal Diode Controller with Reverse-Current Protection
The MAX16171 is an ideal diode controller that protects the load against damaging automotive tra...
  • -42V to +76V Protection Range
    • ​Relaxes TVS Diodes Requirements
  • 4V to 57V Operating Range
    • Accommodates Wide Automotive Supply Rails
  • 9V Gate Drive Voltage with Respect to SRC
    • ​Reduces MOSFET Power Dissipation
  • Enable Input 
    • ​Provides On-the-Fly System Control
  • 1µA Shutdown Current
    • Extends Battery Life
  • 600ns Reverse-Current Blocking Time with 10mV Overdrive
    • ​Extends System Operation Time During Power Interruption
  • -40°C to +125°C Automotive Temperature Range
  • 2mm x 3mm, Side-Wettable TDFN Package
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MAX20313 500mA to 6A Adjustable Current-Limit Switches
The MAX20313–MAX20316 programmable current-limit switches feature internal current limiting to p...
  • Reliable Protection
    • Adjustable Current Limit (500mA to 6A)
    • Accurate ±5% Overload Current Limit (2A to 6A)
    • Current Monitoring
    • Low RON 10mΩ (typ)
    • Reverse Current Protection
    • Short-Circuit Protection
    • Thermal Shutdown Protection
  • Space Saving
    • 12-Bump 0.4mm Pitch 1.68mm x 1.48mm WLP
MAX16171EVKIT Evaluation Kit for the MAX16171
The MAX16171 EV kit is designed to evaluate the MAX16171, an ideal diode controller that protect...
  • 4V to 57V Operating Voltage Range
  • Shutdown Mode Jumper
  • -40°C to +125°C Temperature Range
  • Lead(Pb)-Free and RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested
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MAX15090B 2.7V to 18V, 12A, Hot-Swap Solution with Current Report Output
The MAX15090B/MAX15090C ICs are integrated solutions for hot-swap applications requiring the saf...
  • Integration Reduces Solution Size for Blade Servers and Other Space-Constrained Designs
    • Integrated 6mΩ (typ) Internal Power MOSFET Overvoltage Protection
    • Power-Good and Fault Outputs
    • Programmable Undervoltage Lockout
    • Current Reporting Without Need for External RSENSE
    • Thermal Protection
  • Flexibility Enables Use in Many Unique Designs
    • 2.7V to 18V Operating Voltage Range
    • Adjustable Circuit-Breaker Current/Current-Limit Threshold
    • Programmable Slew-Rate Control
    • Variable-Speed Circuit-Breaker Response
    • Latchoff or Automatic Retry Options
  • Safety Features Ensure Accurate, Robust Protection
    • 12A (max) Load Current Capability
    • ±10% Circuit-Breaker Threshold Accuracy
    • Inrush Current Regulated at Startup with Foldback
    • Implementation for di/dt Control
    • IN-to-OUT Short-Circuit Detection
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MAX15090C 2.7V to 18V, 12A, Hot-Swap Solution with Current Report Output
The MAX15090B/MAX15090C ICs are integrated solutions for hot-swap applications requiring the saf...
  • Integration Reduces Solution Size for Blade Servers and Other Space-Constrained Designs
    • Integrated 6mΩ (typ) Internal Power MOSFET Overvoltage Protection
    • Power-Good and Fault Outputs
    • Programmable Undervoltage Lockout
    • Current Reporting Without Need for External RSENSE
    • Thermal Protection
  • Flexibility Enables Use in Many Unique Designs
    • 2.7V to 18V Operating Voltage Range
    • Adjustable Circuit-Breaker Current/Current-Limit Threshold
    • Programmable Slew-Rate Control
    • Variable-Speed Circuit-Breaker Response
    • Latchoff or Automatic Retry Options
  • Safety Features Ensure Accurate, Robust Protection
    • 12A (max) Load Current Capability
    • ±10% Circuit-Breaker Threshold Accuracy
    • Inrush Current Regulated at Startup with Foldback
    • Implementation for di/dt Control
    • IN-to-OUT Short-Circuit Detection
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MAX16141A 3.5V to 36V Ideal Diode Controller with Voltage and Current Circuit Breaker
The MAX16141/MAX16141A, ideal diode controllers, provide system protection against a variety of ...
  • Wide Voltage Range
    • 3.5V to 36V Operating Voltage Range
    • -36V to +60V Protection Voltage Range
  • Eliminates Discrete Diode Power Dissipation
  • 5µA (Typ) Shutdown Mode Current Reduces Battery Drain
  • Sleep Mode Provides Up to 400μA Load Current
  • TERM Switch Reduces Power Consumption
  • Isolates Failed Supply from Load
    • Bidirectional Current Blocking On Open
    • Bidirectional Voltage Blocking On Open
  • Current Protection
    • Factory Adjustable Overcurrent Trip Thresholds
    • Factory Adjustable Reverse-Current Trip Thresholds
  • Resistor Adjustable Overvoltage and Undervoltage Trip Thresholds
  • Automotive Qualified
    • Operates Down to +3.5V, Riding Out Cold-Crank Conditions
    • -40°C to +125°C Operating Temperature Range
  • N-Channel MOSFET Gate Driver of VIN + 8V
  • Fault Output
    • UVLO, OVLO, Overcurrent, Reverse-Current, Battery Reversal, and Thermal Shutdown
  • AEC-Q100 Qualified MAX16141AAF/V+T
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MAX16141 3.5V to 36V Ideal Diode Controller with Voltage and Current Circuit Breaker
The MAX16141/MAX16141A, ideal diode controllers, provide system protection against a variety of ...
  • Wide Voltage Range
    • 3.5V to 36V Operating Voltage Range
    • -36V to +60V Protection Voltage Range
  • Eliminates Discrete Diode Power Dissipation
  • 5µA (Typ) Shutdown Mode Current Reduces Battery Drain
  • Sleep Mode Provides Up to 400μA Load Current
  • TERM Switch Reduces Power Consumption
  • Isolates Failed Supply from Load
    • Bidirectional Current Blocking On Open
    • Bidirectional Voltage Blocking On Open
  • Current Protection
    • Factory Adjustable Overcurrent Trip Thresholds
    • Factory Adjustable Reverse-Current Trip Thresholds
  • Resistor Adjustable Overvoltage and Undervoltage Trip Thresholds
  • Automotive Qualified
    • Operates Down to +3.5V, Riding Out Cold-Crank Conditions
    • -40°C to +125°C Operating Temperature Range
  • N-Channel MOSFET Gate Driver of VIN + 8V
  • Fault Output
    • UVLO, OVLO, Overcurrent, Reverse-Current, Battery Reversal, and Thermal Shutdown
  • AEC-Q100 Qualified MAX16141AAF/V+T
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MAX17526C 5.5V to 60V, 6A Current-Limiter with OV, UV, Reverse Protection, and Power Limit
The Olympus series of ICs are the industry's smallest and robust integrated system protection so...
  • Robust Protection Reduces System Downtime
    • Wide Input-Supply Range: +5.5V to +60V
    • Active Power Limit to Protect Supply or Load (MAX17526A)
    • Programmable Input Overvoltage Setting up to 40V
    • Negative Input Fault Tolerant (with External NFET)
    • Reverse Current Protection (with External NFET)
    • Low RON Internal NFET (30mΩ typ)
  • Dual-Stage Current Limiting
    • 1.0x Startup Current (MAX17526A)
    • 1.5x Startup Current (MAX17526B)
    • 2.0x Startup Current (MAX17526C)
  • Fast Startup and Brownout Recovery
    • Continuous Current-Limit During Startup
    • Thermal Foldback Current-Limit
  • Flexible Design to Maximize Reuse and Minimize Requalification
    • Adjustable UVLO and OVLO Thresholds
    • ±8.5% Accurate Programmable Current Limit from 0.6A to 6.0A Over Full Temperature Range
    • Programmable Overcurrent Response: Continuous, Autoretry, and Latch-Off Modes
    • Logic Level and High-Voltage Enable Inputs (EN and Active-Low HVEN)
    • Protected External NFET Gate Drive
  • Reduced Solution Footprint
    • 20-Pin 5mm x 5mm TQFN-EP Package
    • Integrated NFET for Common-Use Protection Requirements
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MAX17526A 5.5V to 60V, 6A Current-Limiter with OV, UV, Reverse Protection, and Power Limit
The Olympus series of ICs are the industry's smallest and robust integrated system protection so...
  • Robust Protection Reduces System Downtime
    • Wide Input-Supply Range: +5.5V to +60V
    • Active Power Limit to Protect Supply or Load (MAX17526A)
    • Programmable Input Overvoltage Setting up to 40V
    • Negative Input Fault Tolerant (with External NFET)
    • Reverse Current Protection (with External NFET)
    • Low RON Internal NFET (30mΩ typ)
  • Dual-Stage Current Limiting
    • 1.0x Startup Current (MAX17526A)
    • 1.5x Startup Current (MAX17526B)
    • 2.0x Startup Current (MAX17526C)
  • Fast Startup and Brownout Recovery
    • Continuous Current-Limit During Startup
    • Thermal Foldback Current-Limit
  • Flexible Design to Maximize Reuse and Minimize Requalification
    • Adjustable UVLO and OVLO Thresholds
    • ±8.5% Accurate Programmable Current Limit from 0.6A to 6.0A Over Full Temperature Range
    • Programmable Overcurrent Response: Continuous, Autoretry, and Latch-Off Modes
    • Logic Level and High-Voltage Enable Inputs (EN and Active-Low HVEN)
    • Protected External NFET Gate Drive
  • Reduced Solution Footprint
    • 20-Pin 5mm x 5mm TQFN-EP Package
    • Integrated NFET for Common-Use Protection Requirements
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MAX17526B 5.5V to 60V, 6A Current-Limiter with OV, UV, Reverse Protection, and Power Limit
The Olympus series of ICs are the industry's smallest and robust integrated system protection so...
  • Robust Protection Reduces System Downtime
    • Wide Input-Supply Range: +5.5V to +60V
    • Active Power Limit to Protect Supply or Load (MAX17526A)
    • Programmable Input Overvoltage Setting up to 40V
    • Negative Input Fault Tolerant (with External NFET)
    • Reverse Current Protection (with External NFET)
    • Low RON Internal NFET (30mΩ typ)
  • Dual-Stage Current Limiting
    • 1.0x Startup Current (MAX17526A)
    • 1.5x Startup Current (MAX17526B)
    • 2.0x Startup Current (MAX17526C)
  • Fast Startup and Brownout Recovery
    • Continuous Current-Limit During Startup
    • Thermal Foldback Current-Limit
  • Flexible Design to Maximize Reuse and Minimize Requalification
    • Adjustable UVLO and OVLO Thresholds
    • ±8.5% Accurate Programmable Current Limit from 0.6A to 6.0A Over Full Temperature Range
    • Programmable Overcurrent Response: Continuous, Autoretry, and Latch-Off Modes
    • Logic Level and High-Voltage Enable Inputs (EN and Active-Low HVEN)
    • Protected External NFET Gate Drive
  • Reduced Solution Footprint
    • 20-Pin 5mm x 5mm TQFN-EP Package
    • Integrated NFET for Common-Use Protection Requirements
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MAX22505 ±40V High-Speed USB Port Protector
The MAX22505 is designed to protect a USB port on commercial and industrial equipment against da...
  • Robust Communications
    • Integrated ±50V dc Protection for VBUS/GND
    • Integrated ±40.7V dc Protection for D+/D-
    • Thermal Shutdown Protected
    • -40°C to +105°C Operating Temperature
  • High Performance
    • High (480Mb), Full (12Mb), and Low (1.5Mb) Speed Capable
    • 3.0V to 5.5V Supply Voltage
    • 4Ω (typ) VBUS/D+/D- channel resistance
    • 1Ω (max) GND Channel Resistance
    • High-Speed USB Disable Mode Allowing Operation with High Common Mode Voltages
  • Flexibility
    • Transparent to USB Operation Speeds
    • Configurationless USB Host or Device Protection
    • Optional External MOSFET driver for VBUS and GND Paths
  • Supports USB OTG
  • Simpler Than USB Isolation
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MAX16545B Integrated Protection IC on 12V Bus with an Integrated MOSFET, Lossless Current Sensing, and PMBus Interface
The MAX16545B/C is a circuit-breaker protection IC with an integrated low-resistance MOSFET and ...
  • 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.
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MAX16545C Integrated Protection IC on 12V Bus with an Integrated MOSFET, Lossless Current Sensing, and PMBus Interface
The MAX16545B/C is a circuit-breaker protection IC with an integrated low-resistance MOSFET and ...
  • 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.
MAX15162 8V to 60V Smart Dual 1.5A Circuit Breaker with Accurate Current Monitoring
The MAX15162/MAX15162A devices are dual-channel circuit-breaker ICs. The devices integrate a dua...
  • 8V to 60V Wide Input Voltage Range
  • Integrated Dual-Power MOSFET 
  • Turn-On Resistance 140mΩ (WLP), 180mΩ (TQFN) MOSFET
  • Dual-Channel Independent or Parallel Mode Configuration
  • ± 3% Accuracy Current Reporting on Individual Channel
  • Enable Inputs for Individual Channels
  • Constant Power Control at Startup
  • Startup Watchdog Timer
  • Startup IN-to-OUT Short Protection
  • Undervoltage-Lockout 
  • Overcurrent and Overtemperature Fault Status indication
  • Multilevel Overcurrent Limit Protection
  • Built in Thermal Shutdown Protection
  • Programmable Current Limiting Level
  • Programmable Overcurrent Shut-down Delay time
  • Programmable Auto-Retry Time (MAX15162A) 
  • Latch Off in a Fault Event (MAX15162)
  • Auto-retry in a Fault Event (MAX15162A)
  • 24-pin, 4mm x 4mm TQFN or 16-bump, 2mm x 2mm WLP
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MAX16543 Integrated Protection IC on a High-Power 12V Bus with an Integrated MOSFET and Lossless Current Sensing
The MAX16543 is an integrated follower protection IC that is used in parallel with a Maxim MAX16...
  • Used with the MAX16545B/MAX16545C to Provide Integrated Protection for Loads > 60A On 12V Bus
  • High Density: Industry’s Smallest Circuit Breaker Solution Provides More Than 75% Board Area Savings
    • 12-Lead QFN Package
    • Integrated Power MOSFET with 1.5mΩ Total Resistance in 12V Power Path (RDS(ON), Including Package), Not Including Any Parallel Devices
  • Lossless, Precise Total System Current Sensing and Reporting
  • PMBus/SMBus Control and Reporting Through the MAX16545B/MAX16545C
  • 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 (OCP)
    • Programmable Moderate OCP
    • Programmable Severe OCP Provides Isolation < 5µs
    • Fail-Safe Safe OCP Provides Isolation < 250ns
  • Modular Design, MAX16545B/MAX16545C with Single or Dual MAX16543 in Parallel Provide Different DC Current Capabilities
    • MAX16545B/MAX16545C + 1 MAX16543: 90A DC Capability
    • MAX16545B/MAX16545C + 2 MAX16543: 120A DC Capability
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MAX15093 2.7V to 18V, 15A, Hot-Swap Solution with Current Report Output
The MAX15093/MAX15093A ICs are integrated solutions for hot-swap applications requiring the safe...
  • Integration Reduces Solution Size for Blade Servers and Other Space-Constrained Designs
    • Integrated 3.8mΩ (typ) Internal Power MOSFET Overvoltage Protection
    • Power-Good and Fault Outputs
    • Programmable Undervoltage Lockout
    • Current Reporting Without Need for External RSENSE
    • Thermal Protection
  • Flexibility Enables Use in Many Unique Designs
    • 2.7V to 18V Operating Voltage Range
    • Adjustable Circuit-Breaker Current/Current-Limit Threshold
    • Programmable Slew-Rate Control
    • Variable-Speed Circuit-Breaker Response
    • Latchoff (MAX15093) or Automatic Retry (MAX15093A) Options
  • Safety Features Ensure Accurate, Robust Protection
    • 15A Continuous Load Current Capability
    • ±10% Circuit-Breaker Threshold Accuracy
    • Inrush Current Regulated at Startup with Foldback
    • Implementation for di/dt Control
    • IN-to-OUT Short-Circuit Detection
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MAX15093A 2.7V to 18V, 15A, Hot-Swap Solution with Current Report Output
The MAX15093/MAX15093A ICs are integrated solutions for hot-swap applications requiring the safe...
  • Integration Reduces Solution Size for Blade Servers and Other Space-Constrained Designs
    • Integrated 3.8mΩ (typ) Internal Power MOSFET Overvoltage Protection
    • Power-Good and Fault Outputs
    • Programmable Undervoltage Lockout
    • Current Reporting Without Need for External RSENSE
    • Thermal Protection
  • Flexibility Enables Use in Many Unique Designs
    • 2.7V to 18V Operating Voltage Range
    • Adjustable Circuit-Breaker Current/Current-Limit Threshold
    • Programmable Slew-Rate Control
    • Variable-Speed Circuit-Breaker Response
    • Latchoff (MAX15093) or Automatic Retry (MAX15093A) Options
  • Safety Features Ensure Accurate, Robust Protection
    • 15A Continuous Load Current Capability
    • ±10% Circuit-Breaker Threshold Accuracy
    • Inrush Current Regulated at Startup with Foldback
    • Implementation for di/dt Control
    • IN-to-OUT Short-Circuit Detection
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MAX20333F Adjustable Current-Limit Switch with Low Power Mode
The MAX20333/A/B/C/D/E/F/G/H/I/J/K programmable current-limit switches feature internal current ...
  • Flexible Operation
    • Wide Range of Programmable Current Limit (0.2A to 4.75A)
    • Wide Operating Range: 3.5V to 22V
    • Three Different Current-Limit Modes: NM, HCM, LPM
    • Three Different Current-Limit Behaviors: Autoretry, Latchoff, Continuous
    • Power Good Input
    • Current Monitoring
  • Safe Operation
    • Precision Current Limit
    • Output Short Protection
    • Thermal Protection
    • Flag Output
  • UL 2367 Recognized–File No. E211395
    • MAX20333/A/F/G Only
    • 4.9A/100W Maximum
  • Power Savings
    • Low Power Mode (LPM) with Output Short Protection
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MAX20333E Adjustable Current-Limit Switch with Low Power Mode
The MAX20333/A/B/C/D/E/F/G/H/I/J/K programmable current-limit switches feature internal current ...
  • Flexible Operation
    • Wide Range of Programmable Current Limit (0.2A to 4.75A)
    • Wide Operating Range: 3.5V to 22V
    • Three Different Current-Limit Modes: NM, HCM, LPM
    • Three Different Current-Limit Behaviors: Autoretry, Latchoff, Continuous
    • Power Good Input
    • Current Monitoring
  • Safe Operation
    • Precision Current Limit
    • Output Short Protection
    • Thermal Protection
    • Flag Output
  • UL 2367 Recognized–File No. E211395
    • MAX20333/A/F/G Only
    • 4.9A/100W Maximum
  • Power Savings
    • Low Power Mode (LPM) with Output Short Protection
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MAX20333G Adjustable Current-Limit Switch with Low Power Mode
The MAX20333/A/B/C/D/E/F/G/H/I/J/K programmable current-limit switches feature internal current ...
  • Flexible Operation
    • Wide Range of Programmable Current Limit (0.2A to 4.75A)
    • Wide Operating Range: 3.5V to 22V
    • Three Different Current-Limit Modes: NM, HCM, LPM
    • Three Different Current-Limit Behaviors: Autoretry, Latchoff, Continuous
    • Power Good Input
    • Current Monitoring
  • Safe Operation
    • Precision Current Limit
    • Output Short Protection
    • Thermal Protection
    • Flag Output
  • UL 2367 Recognized–File No. E211395
    • MAX20333/A/F/G Only
    • 4.9A/100W Maximum
  • Power Savings
    • Low Power Mode (LPM) with Output Short Protection