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參數(shù)資料
| 型號： | LTC4352CMS#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 194K |
| 代理商： | LTC4352CMS#PBF |
LTC4352
7
4352f
OPERATION
The LTC4352 controls either single or back-to-back
N-channel MOSFETs in order to emulate an ideal diode. Dual
MOSFETs eliminate current ow from the input to the output
in an input undervoltage or overvoltage condition.
When enabled, an amplier (AMP) monitors the voltage
between the VIN and OUT pins, and drives the GATE pin.
The amplier 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
currents the MOSFET gate is driven fully on and the voltage
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
owing 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
a large forward voltage drop. An external capacitor between
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 SOURCE voltage to 6.7V. The same clamps also limit
the CPO 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 40μs 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-drain pull-down, M1, pulls the STATUS pin low
when 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.
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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相關代理商/技術(shù)參數(shù) |
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| LTC4352HDD#PBF | 功能描述:IC IDEAL DIODE CTLR W/MON 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:- 標準包裝:1,000 系列:- 應用:電池備份，工業(yè)/汽車，大電流開關 FET 型:- 輸出數(shù):5 內(nèi)部開關:是 延遲時間 - 開啟:100ns 延遲時間 - 關閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LTC4352HDD#TRPBF | 功能描述:IC IDEAL DIODE CTLR W/MON 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:- 標準包裝:1,000 系列:- 應用:電池備份，工業(yè)/汽車，大電流開關 FET 型:- 輸出數(shù):5 內(nèi)部開關:是 延遲時間 - 開啟:100ns 延遲時間 - 關閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LTC4352HMS#PBF | 功能描述:IC IDEAL DIODE CTLR W/MON 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:- 標準包裝:1,000 系列:- 應用:電池備份，工業(yè)/汽車，大電流開關 FET 型:- 輸出數(shù):5 內(nèi)部開關:是 延遲時間 - 開啟:100ns 延遲時間 - 關閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LTC4352HMS#TRPBF | 功能描述:IC IDEAL DIODE CTLR W/MON 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:- 標準包裝:1,000 系列:- 應用:電池備份，工業(yè)/汽車，大電流開關 FET 型:- 輸出數(shù):5 內(nèi)部開關:是 延遲時間 - 開啟:100ns 延遲時間 - 關閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:帶卷 (TR) |
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