MAX6495

72V, Overvoltage-Protection Switches/Limiter Controllers with an External MOSFET


Please check latest availability status for a specific part variant.

Description

The MAX6495–MAX6499 is a family of small, low-current, overvoltage-protection circuits for high-voltage transient systems such as those found in automotive and industrial applications. These devices monitor the input voltage and control an external nMOSFET switch to isolate the load at the output during an input overvoltage condition. The MAX6495–MAX6499 operate over a wide supply voltage range from +5.5V to +72V.

The gate of the nMOSFET is driven high while the monitored input is below the user-adjustable overvoltage threshold. An integrated charge-pump circuit provides a 10V gate-to-source voltage to fully enhance the nMOSFET. When the input voltage exceeds the user-adjusted overvoltage threshold, the gate of the MOSFET is quickly pulled low, disconnecting the load from the input. In some applications, disconnecting the output from the load is not desirable. In these cases, the protection circuit can be configured to act as a voltage limiter where the GATE output sawtooths to limit the voltage to the load (MAX6495/MAX6496/MAX6499).

The MAX6496 supports lower input voltages and reduces power loss by replacing the external reverse battery diode with an external series pMOSFET. The MAX6496 generates the proper bias voltage to ensure that the pMOSFET is on during normal operations. The gate-to-source voltage is clamped during load-dump conditions, and the p-channel MOSFET is off during reverse-battery conditions.

The MAX6497/MAX6498 feature an open-drain, undedicated comparator that notifies the system if the output falls below the programmed threshold. The MAX6497 keeps the MOSFET switch latched off until either the input power or the active-low SHDN pin is cycled. The MAX6498 will autoretry when VOVSET falls below 130mV.

These devices are available in small, thermally enhanced, 6-pin and 8-pin TDFN packages and are fully specified from -40°C to +125°C.

MAX6495, MAX6496, MAX6497, MAX6498, MAX6499: Functional Diagrams MAX6495, MAX6496, MAX6497, MAX6498, MAX6499: Functional Diagrams Enlarge+

Key Features

  • Integration and Small Package Saves Board Space While Ensuring Reliable System Operation
    • 3mm x 3mm TDFN Package
    • Supply Voltage Range: +5.5V to +72V
    • Fast Gate Shutoff During Overvoltage with 100mA Sink Capability
    • Internal Charge-Pump Circuit Ensures 10V Gate-to-Source Enhancement for Low RDS(ON) Performance
    • Supports Series pMOSFET for Reverse-Battery Voltage Protection (MAX6496)
    • POK Indicator (MAX6497/MAX6498)
    • Adjustable Overvoltage Threshold
    • Adjustable Undervoltage Threshold (MAX6499)
  • Integrated Protection Features and Wide Temperature Range Improve Reliability
    • Overvoltage-Protection Switch Controller Allows User to Size External nMOSFETs
    • nMOSFET Latches Off After an Overvoltage Condition (MAX6497/MAX6499)
    • Thermal-Shutdown Protection
    • -40°C to +125°C Operating Temperature Range
    • AEC-Q100 Qualified (MAX6495ATT/V+, MAX6496ATA/V+T, and MAX6499ATA/V+ Only)

Applications/Uses

  • Automotive
  • FireWire®
  • Industrial
  • Notebook Computers
  • Telecom/Servers/Networking
Part NumberChannelsVIN
(V)
VIN
(V)
Over Voltage Trip Level
(V)
Under Voltage Lockout
(V)
VGATE
(V)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX6495 15.572Adjustable (1.2V)5
8
8.6
10
-40 to +125
See Data Sheet
$3.60 @1k
MAX6496 
TDFN/8
$4.20 @1k
MAX6497 
TDFN/8
$4.20 @1k
MAX6499 
TDFN/8
$4.20 @1k
See All Overvoltage Protection Controllers (81)

Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/Pins
min@ +25°Cmax
MAX6495 
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
-<1msNo Watchdog
Adjustable Reset Input
High Voltage (>6V)
Overvoltage/Window Monitor
2.530
TDFN/6
MAX6496 -
Adjustable Reset Input
High Voltage (>6V)
Overvoltage/Window Monitor
30
See Data Sheet
MAX6497 
Active Low
Open Drain
Adjustable Reset Input
High Voltage (>6V)
Latched Output
Overvoltage/Window Monitor
24
See Data Sheet
MAX6499 -
Adjustable Reset Input
High Voltage (>6V)
Latched Output
Overvoltage/Window Monitor
24
See Data Sheet
See All Supervisors (1 Monitored Voltage) (261)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX6495EVKIT: Evaluation Kit for the MAX6495
MAX6496EVKIT: Evaluation Kit for the MAX6496

Tools & Models

  • MAX6495 PSPICE Macromodel
  • CAD Symbols and Footprints

  • MAX6495ATT+
  • MAX6495ATT+T
  • MAX6495ATT/V+
  • MAX6495ATT/V+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
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    Temperature:

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