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参数资料
| 型号： | LTC4352HMS#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封装： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件页数： | 14/16页 |
| 文件大小： | 218K |
| 代理商： | LTC4352HMS#TRPBF |
LTC4352
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4352fa
operaTion
The LTC4352 controls either single or back-to-back
N-channel MOSFETs in order to emulate an ideal diode.
Dual MOSFETs eliminate current flow from the input to the
output in an input undervoltage or overvoltage condition.
When enabled, an amplifier (AMP) monitors the voltage
between the VIN and OUT pins, and drives the GATE pin.
The amplifier controls the gate of the external MOSFET
to servo its forward voltage drop (VIN – OUT) to 25mV.
The gate voltage rises to enhance the MOSFET if the load
current causes more than 25mV of drop. For large output
currentstheMOSFETgateisdrivenfullyonandthevoltage
drop is equal to ILOAD RDS(ON).
In the case of an input supply short-circuit, when the
MOSFET is conducting, a large reverse current starts
flowing from the load towards the input. The AMP detects
this failure condition as soon as it appears, and turns off
the MOSFET by pulling down the GATE pin. The REV pin
can be used to allow reverse current, overriding the diode
behavior.
The AMP quickly pulls-up the GATE pin whenever it senses
alargeforwardvoltagedrop.Anexternalcapacitorbetween
the CPO and SOURCE pins is needed for fast gate pull-up.
This capacitor is charged up, at device power-up, by the
internal charge-pump. This stored charge is used for the
fast gate pull-up.
The GATE pin sources current from the CPO pin, and sinks
current to the SOURCE and GND pins. Internal clamps
limit the GATE to SOURCE voltage to 6.1V, and the CPO to
SOURCEvoltageto6.7V.ThesameclampsalsolimittheCPO
and GATE pins to a diode voltage below the SOURCE pin.
OV, UV, and VCC comparators, CP1 to CP3, control power
passage. The MOSFET is held off whenever the OV pin
is above 0.5V, the UV pin is below 0.5V, or the VCC pin is
below 2.57V. There is a 40s delay from all three condi-
tions becoming good to GATE being allowed to turn on.
Overvoltage causes a fast turn-off, while undervoltage
activates a 100μA pull-down on GATE after a 7μs delay.
Open-drainpull-down,M1,pullstheSTATUSpinlowwhen
the GATE to SOURCE voltage exceeds 0.7V, to indicate that
power is passing through the MOSFET. The FAULT output,
M2, pulls low during an undervoltage or overvoltage fault
condition. It also pulls low when GATE is fully on and
the forward voltage drop exceeds 250mV, indicating the
MOSFET has too much current or has failed open circuit.
Note that this open MOSFET fault does not turn off the
MOSFET unlike the undervoltage and overvoltage faults.
LDO is a low dropout regulator that generates a 4.1V
supply at the VCC pin from the VIN input. When a supply
below 2.9V is being ORed, an external supply in the 2.9V
to 6V range is required at the VCC pin. Comparator CP4
will disable LDO when VIN is below VCC.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4352IDD#PBF | 功能描述:IC IDEAL DIODE CNTRL 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC4352IDD#TRPBF | 功能描述:IC IDEAL DIODE CNTRL 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC4352IMS#PBF | 功能描述:IC IDEAL DIODE CNTRL 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC4352IMS#TRPBF | 功能描述:IC IDEAL DIODE CNTRL 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC4352IMSPBF | 制造商:Linear Technology 功能描述:Ideal Diode Controller Monitoring MSOP12 |
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