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| 型号： | MAX6397VATA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC SW OVERVOLT PROT 8-TDFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 电压 - 工作： | 72V |
| 技术： | 混合技术 |
| 功率（瓦特）： | 1.45W |
| 电路数： | 1 |
| 应用： | 通用 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Overvoltage Protection Switch/Limiter
Controllers Operate Up to 72V
V MAX
V OV
V BATT
+ V Q1 -
I LOAD
V BATT
IN
GATE
GATE
t 2
60V
TVS
OUT
LOAD
MAX6397
MAX6398
SET
OUT
t 1
t OVP
t 3
GND
Figure 11. MAX6397/MAX6398 Timing Diagram
same thermal island. Good thermal contact between the
MAX6397/MAX6398 and the external nFET is essential
Figure 10. Power Dissipated Across MOSFETs During an
Overvoltage Fault (Overvoltage Limiter Mode)
MOSFET Selection
Select external MOSFETs according to the application
current level. The MOSFET’s on-resistance (R DS(ON) )
should be chosen low enough to have minimum voltage
drop at full load to limit the MOSFET power dissipation.
Determine the device power rating to accommodate
an overvoltage fault when operating the MAX6397/
MAX6398 in overvoltage limit mode.
During normal operation, the external MOSFETs dissipate
little power. The power dissipated in normal operation is:
P Q1 = I LOAD 2 x R DS(ON).
The most power dissipation will occur during a pro-
longed overvoltage event when operating the
MAX6397/MAX6398 in voltage limiter mode, resulting in
high power dissipated in Q1 (Figure 10) where the
power dissipated across Q1 is:
P Q1 = V Q1 x I LOAD
where V Q1 is the voltage across the MOSFET’s drain
and source.
Thermal Shutdown
The MAX6397/MAX6398 thermal-shutdown feature shuts
off the linear regulator output, REG, and GATE if it
exceeds the maximum allowable thermal dissipation.
Thermal shutdown also monitors the PC board tempera-
ture of the external nFET when the devices sit on the
for the thermal-shutdown feature to operate effectively.
Place the nFET as close as possible to OUT.
When the junction temperature exceeds T J = +150°C,
the thermal sensor signals the shutdown logic, turning off
REG’s internal pass transistor and the GATE output,
allowing the device to cool. The thermal sensor turns
the pass transistor and GATE on again after the IC’s
junction temperature cools by 20°C. Thermal-overload
protection is designed to protect the MAX6397/
MAX6398 and the external MOSFET in the event of cur-
rent-limit fault conditions. For continuous operation, do
not exceed the absolute maximum junction-tempera-
ture rating of T J = +150°C.
Thermal Shutdown
Overvoltage Limiter Mode
When operating the MAX6397/MAX6398 in overvoltage
limit mode for a prolonged period of time, a thermal
shutdown is possible due to device self-heating. The
thermal shutdown is dependent on a number of differ-
ent factors:
? The device’s ambient temperature (T A )
? The output capacitor (C OUT )
? The output load current (I OUT )
? The overvoltage threshold limit (V OV )
? The overvoltage waveform period (t OVP )
? The power dissipated across the package (P DISS )
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| MAX6397LATA+T | IC SW OVERVOLT PROT 8-TDFN |
| RP1005S-1R8-F | RES HP 1.8 OHM 1/6W 1% 0402 SMD |
| MAX6397TATA+T | IC SW OVERVOLT PROT 8-TDFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6397WATA | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION SWITCH/LIMIT - Rail/Tube |
| MAX6397WATA+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR CNTRLR 1.215V 8TDFN EP - Rail/Tube |
| MAX6397WATA+T | 功能描述:监控电路 Over Volt Protection Switch/Limiter RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6397WATA-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6397YATA | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION SWITCH/LIMIT - Rail/Tube |
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