MAX6495 Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX6495

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

Maxim Integrated 

MAX6495–MAX6499

EVALUATION KIT AVAILABLE

72V, Overvoltage-Protection

Switches/Limiter Controllers

with an External MOSFET

General 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

devices 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 over-

voltage 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

saw-tooths 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 pMOSFET 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 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.

Benefits and 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+ and

MAX6499ATA/V+ Only)

Applications

●● Automotive

●● Industrial

●● Telecom/Servers/Networking

●● FireWire®

●● Notebook Computers

Selector Guide and Ordering Information appear at end of

data sheet.

FireWire is a registered trademark of Apple, Inc.

19-3778; Rev 14; 7/17

Share Link: