 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
SP6203 Datasheet(PDF) 10 Page - Sipex Corporation |
|
||||||||||||||||||||||||||||||
SP6203 Datasheet(HTML) 10 Page - Sipex Corporation |
|
|
10 / 16 page  0 Date: Apr2-07 SP6203/SP6205 Low Noise, 300 and 500mA CMOS LDO Regulators © 2007 Sipex Corporation 0 Date: 2//05 SP6203/6205 Low Noise, 300 and 500mA CMOS LDO Regulators © Copyright 2005 Sipex Corporation THEORY OF OPERATiON: Continued Turn On Time The turn on response is split up in two separate response categories: the wake up time (TWU) and the settlling time (TS). The wake up time is defined as the time it takes for the output to rise to 2% of its total value after being released from shutdown (EN > 0.4V). The settling time is definedastheconditionwheretheoutputreaches 98% of its total value after being released from shutdown. The latter is also called the turn on time and is dependent on the output capacitor, a little bit on load and, if present, on a bypass capacitor. TJ(max) is the maximum junction temperature of the die and is 125°C. TA is the ambient tempera- ture. JA is the junction-to-ambient thermal re- sistance for the regulator and is layout depen- dent. The SOT-23-5 package has a JA of approximately 256°C/W for minimum PCB copper footprint area. This results in a maximum power dissipation of: PD(max) = [(125°C - 25°C)/(191°C/W)] = 523mW The actual power dissipation of the regulator circuit can be determined using one simple equation: PD = (VIN - VOUT) * IOUT + VIN * IGND To prevent the device from entering thermal shutdown. maximum power dissipation can not be exceeded. Substituting PD(max) for PD and solving for the operating conditions that are critical to the ap- plication will give the maximum operating con- ditions for the regulator circuit. For example, if we are operating the SP6203 3.0V at room temperature, with a minimum footprint layout and and output current of 300mA, the maximum input voltage can be determined, based on the equation below. Ground pin current can be taken from the electrical specifications table (0.23mA at 300mA). 390mW = (VIN-3.0V) * 300mA + VIN *0.23mA After calculations, we find that the maximum input voltage of a 3.0V application at 300mA of output current in a SOT-23-5 package is 4.7V. So if the intend is to operate a 5V output version from a 6V supply at 300mA load and at a 25°C ambient temperature, then the actual total power dissipation will be: PD=([6V-5V]*[300mA])+(6V*0.23mA)=301.4mW This is well below the 523mW package maxi- mum. Therefore, the regulator can be used. Turn Off Time The turn off time is defined as the condition where the output voltage drops about 66% ( ) of its total value. 5 to 7 is the constant where the output voltage drops nearly to zero. There will always be a small voltage drop in shutdown because of the switch unless we short-circuit it. The turn off time of the output voltage is depen- dent on load conditions, output capacitance on VOUT (time constant = RLCL) and also on the difference in voltage between input and output. Thermal Considerations The SP6203/6205 is designed to provide 300/ 500 mA of continuous current in a tiny package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junc- tion-to-ambient thermal resistance of the device and the following basic equation: PD = (TJ(max) - TA) / JA 2% t(s) = T(on) % t(wu) VOUT VENABLE |
Similar Part No. - SP6203_07 |
|
Similar Description - SP6203_07 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
