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| 型号： | LT4351CMS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR MOSFET DIODE-OR 10MSOP |
| 标准包装： | 2,500 |
| 应用： | 并行/冗余电源 |
| FET 型： | N 沟道 |
| 输出数： | 1 |
| 内部开关： | 无 |
| 延迟时间 - 关闭： | 600ns |
| 电源电压： | 1.2 V ~ 18 V |
| 电流 - 电源： | 1.4mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 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) |
LT4351
APPLICATIONS INFORMATION
I VINVDD = ? 1 +
? 10.6 ? I VDD
V IN ? ? 80%
C B ≥
R ESR
ForV IN lessthan2V,chooseaDCresistancelessthan0.2Ω.
Note that V DD current referred to the input supply is higher.
A first order approximation of the input current is:
?
?
Under normal operation, the V DD current is under 10mA
and the boost regulator operates in Burst Mode ? operation.
If any additional load is added, ensure that the regulator is
capable of supplying that load. As the load is increased,
the boost regulator will switch into continuous mode op-
eration. Further increases in load will collapse the boost
regulator voltage.
Operating the regulator with increased load will cause
increased IC power dissipation and temperature, which
must be taken into consideration.
A 100ns delay from detecting the switch current limit to
turning off the power switch produces an overshoot of the
inductor current from the 0.45A switch limit. The amount
of overshoot depends on the boost regulator inductance.
Choosing an inductor that can handle 0.75A peak current
will be sufficient for the recommended inductors.
Diode Selection
Schottky diodes, with their low forward voltage drop and
fast switching speed, are the best match for the LT4351
boost regulator. Select a diode that can handle 0.75A peak
current and a reverse breakdown of 15V greater than the
maximum V IN .
V IN
200mV
V DD Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors should
be used on V DD to minimize the output ripple voltage.
Multilayer ceramic capacitors are the best choice, as
they have a very low ESR and are available in very small
packages. Always use a capacitor with a voltage rating at
least 12V greater than V IN .
Capacitors
Two types of input capacitors are generally needed for the
LT4351. The first is a large bulk capacitor that takes care
of ringing associated with inductance of the input supply
lines and provides charge for the load when switching the
MOSFET. The input parasitic inductance in conjunction with
C B and its ESR create an LCR network. The input LCR can
be stimulated by the boost regulator switch current or load
current transients when the MOSFETs are on. To reduce
ringing associated with input inductance, C B should be:
4 ? L IN
2
where C B is the capacitor value, R ESR is the capacitor’s
ESR and L IN is the inductance of the input lines.
While damped ringing is not necessarily bad, it may pro-
duce unexpected results as the LT4351 ideal diode reacts
to the varying V IN to OUT voltage. Typically an electrolytic
or tantalum low ESR capacitor would be used. Figure 7a
illustrates V IN for a low value of C B and Figure 7b shows
it with a correctly sized value.
V IN
200mV
10μs/DIV
4351 F07a
10μs/DIV
4351 F07b
Figure 7a. Example of Input Voltage Ringing
with Low C IN Capacitor at MOSFET Turn Off
Figure 7b. Example of Input Voltage with
Sufficient C IN Capacitor at MOSFET Turn Off
4351fd
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT4351IMS | 功能描述:IC CTRLR MOSFET DIODE-OR 10MSOP RoHS:否 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) |
| LT4351IMS#PBF | 功能描述:IC CTLR MOSFET DIODE-OR 10MSOP 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) |
| LT4351IMS#TR | 功能描述:IC CTRLR MOSFET DIODE-OR 10MSOP RoHS:否 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) |
| LT4351IMS#TRPBF | 功能描述:IC CTRLR MOSFET DIODE-OR 10MSOP 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) |
| LT4352 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Surge |
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