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| 型号： | LT4356HMS-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 描述： | IC OVERVOLT PROT REG 10-MSOP |
| 产品培训模块： | LT4356 Surge Stopper |
| 产品目录绘图： | LT4356 Output Graph LT4356 Series 10-MSOP |
| 标准包装： | 2,500 |
| 电压 - 工作： | 4 ~ 80V |
| 电压 - 箝位： | 27V，可调 |
| 技术： | 混合技术 |
| 电路数： | 1 |
| 应用： | 自动 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
| 配用： | DC1018B-C-ND - DEMO BOARD FOR LT4356-3 DC1018B-B-ND - DEMO BOARD FOR LT4356-2 DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
LT4356-1/LT4356-2
OPERATION
Some power systems must cope with high voltage surges
of short duration such as those in automobiles. Load
circuitry must be protected from these transients, yet
high availability systems must continue operating during
these events.
The LT4356 is an overvoltage protection regulator that
drives an external N-channel MOSFET as the pass transis-
tor. It operates from a wide supply voltage range of 4V to
80V. It can also be pulled below ground potential by up
to 60V without damage. The low power supply require-
ment of 4V allows it to operate even during cold cranking
conditions in automotive applications. The internal charge
pump turns on the N-channel MOSFET to supply current
to the loads with very little power loss. Two MOSFETs can
be connected back to back to replace an inline Schottky
diode for reverse input protection. This improves the ef-
?ciency and increases the available supply voltage level
to the load circuitry during cold crank.
Normally, the pass transistor is fully on, powering the
loads with very little voltage drop. When the supply volt-
age surges too high, the voltage ampli?er (VA) controls
the gate of the MOSFET and regulates the voltage at the
source pin to a level that is set by the external resistive
divider from the OUT pin to ground and the internal 1.25V
reference. A current source starts charging up the capaci-
tor connected at the TMR pin to ground. If the voltage at
the TMR pin, V TMR , reaches 1.25V, the FLT pin pulls low
to indicate impending turn-off due to the overvoltage
condition. The pass transistor stays on until the TMR
pin reaches 1.35V, at which point the GATE pin pulls low
turning off the MOSFET.
The potential at the TMR pin starts decreasing as soon as
the overvoltage condition disappears. When the voltage
at the TMR pin reaches 0.5V the GATE pin begins rising,
turning on the MOSFET. The FLT pin will then go to a high
impedance state.
The fault timer allows the load to continue functioning
during short transient events while protecting the MOSFET
from being damaged by a long period of supply overvolt-
age, such as a load dump in automobiles. The timer period
varies with the voltage across the MOSFET. A higher voltage
corresponds to a shorter fault timer period, ensuring the
MOSFET operates within its safe operating area (SOA).
The LT4356 senses an overcurrent condition by monitor-
ing the voltage across an optional sense resistor placed
between the V CC and SNS pins. An active current limit
circuit (IA) controls the GATE pin to limit the sense volt-
age to 50mV. A current is also generated to start charging
up the TMR pin. This current is about 5 times the current
generated during an overvoltage event. The FLT pin pulls
low when the voltage at the TMR pin reaches 1.25V and
the MOSFET is turned off when it reaches 1.35V.
An auxiliary ampli?er is provided with the negative input
connected to an internal 1.25V reference. The output pull
down device is capable of sinking up to 2mA of current
allowing it to drive an LED or opto coupler. This ampli?er
can be con?gured as a linear regulator controller driving
an external PNP transistor or a comparator function to
monitor voltages.
A shutdown pin turns off the pass transistor and reduces
the supply current to less than 7μA for the LT4356-1. The
supply current drops down to 60μA while keeping the
internal reference and the auxiliary ampli?er active for the
LT4356-2 version during shutdown.
4356fa
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT4356HMS-3 | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 10-Pin MSOP |
| LT4356HMS-3#PBF | 功能描述:IC REG OVP W/LATCHOFF 10-MSOP RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:带卷 (TR) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
| LT4356HMS-3#PBF | 制造商:Linear Technology 功能描述:HOT SWAP CONTROLLER IC |
| LT4356HMS-3#TRPBF | 功能描述:IC REG OVP FAULT TIMER 10MSOP RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:带卷 (TR) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
| LT4356HMS-3PBF | 制造商:Linear Technology 功能描述:Surge Protection Adj Regulator 4-80V 7uA |
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