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参数资料
| 型号： | LTC4352IMS#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO12 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 15/16页 |
| 文件大小： | 194K |
| 代理商： | LTC4352IMS#PBF |
LTC4352
8
4352f
High availability systems often employ parallel-connected
power supplies or battery feeds to achieve redundancy
and enhance system reliability. ORing diodes have been
a popular means of connecting these supplies at the
point of load. Diodes with storage capacitors also hold
up supply voltages when an input voltage sags or has a
brownout. The disadvantage of these approaches is the
diode’s signicant forward voltage drop and the resulting
power loss. Additionally, diodes provide no information
concerning the status of the sourcing supply. Separate
control must therefore be added to ensure that a supply
that is out of range is not allowed to affect the load.
The LTC4352 solves these problems by using an external
N-channel MOSFET as the pass element (see Figure 1). The
MOSFET is turned on when power is being passed, allowing
for a low voltage drop from the supply to the load. When
the input source voltage drops below the output common
supply voltage it turns off the MOSFET, thereby matching
the function and performance of an ideal diode.
Power Supply Conguration
The LTC4352 can operate with supplies down to 0V. This
requires powering the VCC pin with an always present
external supply in the 2.9V to 6V range. If not always
present, a series 470Ω resistor or Schottky diode limits
device power dissipation and backfeeding of low VCC
supply when VIN is high. For a 2.9V to 4.7V VCC supply,
VIN should be lower than VCC. A 0.1μF bypass capacitor
should also be connected between the VCC and GND pins,
close to the device. Figure 2 illustrates this.
If VIN operates above 2.9V then the external supply at
VCC is not needed. The 0.1μF capacitor is still required
for bypassing.
APPLICATIONS INFORMATION
Figure 1. 12V Ideal Diode with Status and Fault Indicators
VCC
UV
OV
REV
LTC4352
STATUS
FAULT
0.1μF
C2
R4
2.7k
D1
D1: GREEN LED LN1351C
D2: RED LED LN1261CAL
MOSFET
ON
FAULT
D2
R5
2.7k
C1
TO LOAD
12V
Q1
Si7336ADP
0.1μF
4352 F01
CPO
VIN
SOURCE
GATE
GND
OUT
Figure 2. Power Supply Congurations
VCC
LTC4352
TO LOAD
0V TO VCC
VIN
GATE
OUT
0.1μF
2.9V TO 4.7V
GND
VCC
LTC4352
TO LOAD
0V TO 18V
4352 F02
VIN
GATE
OUT
GND
VCC
LTC4352
TO LOAD
2.9V TO 18V
VIN
GATE
OUT
0.1μF
GND
0.1μF
4.7V TO 6V
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相关代理商/技术参数 |
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| LTC4353CDE#TRPBF | 制造商:Linear Technology 功能描述:MOSFET DRVR 2-OUT 16-Pin DFN EP T/R |
| LTC4353CMS#PBF | 功能描述:IC OR CTRLR N-CH 2CH 16MSOP 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) |
| LTC4353CMS#TRPBF | 制造商:Linear Technology 功能描述:MOSFET DRVR 2-OUT 16-Pin MSOP T/R |
| LTC4353IDE#PBF | 功能描述:IC OR CTRLR N-CH 2CH 16DFN 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) |
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