Electronic Components Datasheet Search |
|
LTC4352CDD-TRPBF Datasheet(PDF) 8 Page - Linear Technology |
|
LTC4352CDD-TRPBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 16 page 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 significant 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 Configuration 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 Configurations 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 |
Similar Part No. - LTC4352CDD-TRPBF |
|
Similar Description - LTC4352CDD-TRPBF |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |