MAX6495, MAX6496, MAX6497, MAX6498, MAX6499 72V、过压保护开关/限幅控制器，外置MOSFET

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MAX6495–MAX6499系列小型、低电流过压保护电路适用于汽车和工业等应用中的大电压跳变系统。这些器件监视输入电压，在出现输入过压时，控制外部n沟道MOSFET开关，隔离输出负载。MAX6495–MAX6499可工作在较宽的+5.5V至+72V供电电压范围内。

当监控输入低于用户设置的过压门限时，n沟道MOSFET栅极被驱动为高。集成的电荷泵电路提供一个10V栅极-源极电压，完全导通n沟道MOSFET。当输入电压超过用户设置的过压门限时，迅速拉低MOSFET的栅极，将负载与输入断开。在某些应用中，不希望将负载和输出断开。在这些情况下，保护电路可配置为电压限幅器，GATE输出齿波来限制负载电压(MAX6495/MAX6496/MAX6499)。

MAX6496支持较低的输入电压，通过外部串联p沟道MOSFET替换外部电池反接保护二极管来降低功率损耗。MAX6496产生合适的偏置电压，确保p沟道MOSFET在正常工作时打开导通。出现抛负载情况时，栅极-源极电压被嵌箝位，电池反接时p沟道MOSFET被关断。

MAX6497/MAX6498具有一个开漏、通用比较器，在输出低于设置门限时，可通知系统。MAX6497保持MOSFET开关闭锁，直至输入电源重新上电或者刷新/SHDN引脚为止。当V_OVSET降至130mV以下时，MAX6498将会自动重启。

这些器件采用小尺寸、热增强的型6引脚和8引脚TDFN封装，工作在-40°C至+125°C温度范围。

关键特性

应用/使用

宽输入电压范围：+5.5V至+72V
过压保护开关控制器充许用户选择最合适的外部n沟道MOSFET
过压时，栅极快速关断，具有100mA吸收能力
内部电荷泵电路确保10V的栅极-源极电压，实现低R_DS(ON)导通性能
发生过压后，n沟道MOSFET闭锁(MAX6497/MAX6499)
可调过压门限
热关断保护
支持串联p沟道MOSFET，实现电池反接电压保护(MAX6496)
POK指示器(MAX6497/MAX6498)
可调欠压门限(MAX6499)
-40°C至+125°C工作温度范围
小型、3mm x 3mm TDFN封装

	汽车
	FireWire®
	工业
	笔记本电脑
	电信/服务器/网络

Key Specifications: Overvoltage Protection Controllers

Part Number

Number of Channels

VIN Min (V)

VIN Max (V)

Overvoltage Trip Level (V)

Undervoltage Lockout (V)

GATE Voltage (V)

Features

RoHS Available

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX6495

5.5

Adjustable (1.2V)

10
8
8.6

•	Internal Charge Pump

•	Voltage Limiter Mode

Yes

Automotive - General

THIN QFN (Dual)/6

-40 to +125

$1.23 @ 1k

MAX6496

•	Internal Charge Pump

•

Latch

•	Reverse Polarity Protection

•	Voltage Limiter Mode

THIN QFN (Dual)/8

$1.28 @ 1k

MAX6497

•	Internal Charge Pump

•

Latch

THIN QFN (Dual)/8

$1.28 @ 1k

MAX6498

•	Auto Retry

•	Internal Charge Pump

THIN QFN (Dual)/8

$1.28 @ 1k

MAX6499

•	Internal Charge Pump

•

Latch

THIN QFN (Dual)/8

$1.28 @ 1k

See All Overvoltage Protection Controllers (39)

Key Specifications: Supervisors (1 Monitored Voltage)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Min. Reset Timeout Range

Watchdog Feature

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

RoHS Available

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX6495

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

<1ms

No Watchdog

Adjustable Reset Input
High Voltage (>6V)
Overvoltage/Window Monitor

2.5

Yes

Automotive - General

THIN QFN (Dual)/6

-40 to +125

$1.23 @ 1k

MAX6496

Adjustable Reset Input
High Voltage (>6V)
Overvoltage/Window Monitor

THIN QFN (Dual)/8

$1.28 @ 1k

MAX6497

Open Drain

Adjustable Reset Input
High Voltage (>6V)
Latched Output
Overvoltage/Window Monitor

THIN QFN (Dual)/8

$1.28 @ 1k

MAX6498

Open Drain

Adjustable Reset Input
High Voltage (>6V)
Overvoltage/Window Monitor

THIN QFN (Dual)/8

$1.28 @ 1k

MAX6499

Adjustable Reset Input
High Voltage (>6V)
Latched Output
Overvoltage/Window Monitor

THIN QFN (Dual)/8

$1.28 @ 1k

See All Supervisors (1 Monitored Voltage) (268)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.