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参数资料
| 型号： | MAX16127TC+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | IC LOAD DUMP REV V PROT 12TQFN |
| 标准包装： | 2,500 |
| 应用： | 负载突降，电压保护 |
| 电流 - 电源： | 224µA |
| 电源电压： | 3 V ~ 30 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
MAX16126/MAX16127
Load-Dump/Reverse-Voltage Protection Circuits
Detailed Description
The MAX16126/MAX16127 transient protection circuits are
suitable for automotive and industrial applications where
high-voltage transients are commonly present on supply
voltage inputs. The devices monitor the input voltage and
control two external common-source n-channel MOSFETs
to protect downstream voltage regulators during load-
dump events or other automotive pulse conditions.
The devices feature an overvoltage and an undervoltage
comparator for voltage window detection. A flag output
( FLAG ) asserts when a fault event occurs.
Two external back-to-back n-channel MOSFETs provide
reverse-voltage protection and also prevent reverse cur-
rent during a fault condition. Compared to a traditional
reverse-battery diode, this approach minimizes power
dissipation and voltage drop, and allows the circuit to
operate at very low cold-crank voltages (3V minimum).
The MAX16127 provides a limiter-mode fault manage-
ment for overvoltage and thermal shutdown conditions,
whereas the MAX16126 provides switch-mode fault
management for overvoltage and thermal shutdown con-
ditions. In the limiter mode, the MOSFETs cycle on and
off so the output voltage is limited. In the switch mode,
the external MOSFETs are switched off, disconnecting
the load from the input. In both cases, FLAG asserts to
indicate a fault.
Gate Charge Pump
The MAX16126/MAX16127 use a charge pump to gener-
ate the GATE to SRC voltage and enhance the external
MOSFETs. After the input voltage exceeds the input
undervoltage threshold, the charge pump turns on after
a 150 F s delay.
During a fault condition, GATE is pulled to ground with
a 8.8mA (min) pulldown current. Note that an external
zener diode is required to be connected between the
gate and source of the external MOSFETs. See the
Applications Information section.
Overvoltage Protection
The MAX16126/MAX16127 detect overvoltage condi-
tions using a comparator that is connected through an
external resistive divider to the input or output voltage.
An overvoltage condition causes the GATE output to go
low, turning off the external MOSFETs. FLAG also asserts
to indicate the fault condition.
Maxim Integrated
Overvoltage Limiter (MAX16127)
In overvoltage limiter mode, the output voltage is regu-
lated at the overvoltage threshold voltage and continues
to supply power to downstream devices. In this mode,
the device operates like a voltage regulator.
During normal operation, GATE is enhanced 9V above
SRC. The output voltage is monitored through a resis-
tive divider between OUT and OVSET. When OUT rises
above the overvoltage threshold, GATE goes low and
the MOSFETs turn off. As the voltage on OUT falls below
the overvoltage threshold minus the threshold hysteresis,
GATE goes high and the MOSFETs turn back on again,
regulating OUT in a switched-linear mode at the overvolt-
age threshold.
The switching frequency depends on the gate charge of
the MOSFETs, the charge-pump current, the output load
current, and the output capacitance.
Caution must be exercised when operating the
MAX16127 in voltage-limiting mode for long durations.
Since MOSFETs can dissipate power continuously during
this interval, proper heat sinking should be implemented
to prevent damage to them.
Overvoltage Switch (MAX16126)
In the overvoltage switch mode, the internal overvolt-
age comparator monitors the input voltage and the load
is completely disconnected from the input during an
overvoltage event. When the input voltage exceeds the
overvoltage threshold, GATE goes low and the MOSFETs
turn off, disconnecting the input from the load. After that,
for the autoretry mode version, the autoretry timer starts,
while for the latched mode version a power cycle to IN or
a cycle on SHDN is needed to turn the external MOSFETs
back on.
The MAX16126 can be configured to latch off (suffix D)
even after the overvoltage condition ends. The latch is
cleared by cycling IN below the undervoltage threshold
or by toggling SHDN .
The devices can also be configured to retry:
U One time, then latch off (suffix B)
U Three times, then latch off (suffix C)
U Always retry and never latch off (suffix A)
There is a fixed 150ms (typ) delay between each retry
attempt. If the overvoltage fault condition is gone when
a retry is attempted, GATE goes high and power is
restored to the downstream circuitry.
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16128AUAACAC+ | 功能描述:监控电路 Load Dump Protector 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 |
| MAX16128EVKIT# | 功能描述:电源管理IC开发工具 MAX16128 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16128UAACAC+ | 功能描述:浪涌抑制器 Load-Dump/Reverse-V Protection Circuit RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体: |
| MAX16128UAACAC+T | 制造商:Maxim Integrated Products 功能描述:LOAD-DUMP/REVERSE-VOLTAGE PROTECTION CIRCUITS - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC LOAD DUMP REV V PROT 8UMAX 制造商:Maxim Integrated Products 功能描述:Load-Dump/Reverse V Protection Circuit |
| MAX16129AUAEBD+ | 功能描述:监控电路 Load Dump 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 |
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