 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TPS797285DCKR Datasheet(PDF) 9 Page - Texas Instruments |
|
|
||||||||||||||||||||||||||||||
TPS797285DCKR Datasheet(HTML) 9 Page - Texas Instruments |
|
|
9 / 17 page  P = D(max) T max T R J A JA - q P =(V -V )xI D I O O + C 1 0.1 F m PG OUT 4 3 IN NC GND 2 1 5 V OUT TPS797xx 100k W - 0.47 F m TPS797xx www.ti.com SLVS332H – MARCH 2001 – REVISED APRIL 2012 APPLICATION INFORMATION The TPS797xx family of low-dropout (LDO) regulators The maximum-power-dissipation limit is determined have been optimized for use in micropower using the following equation: applications. They feature extremely low dropout voltages and ultralow quiescent current (1.2 μA (1) typically). Where: A typical application circuit is shown in Figure 14. TJmax is the maximum allowable junction temperature. RθJA is the thermal resistance junction-to-ambient for the package (see Package Dissipation Ratings). TA is the ambient temperature. The regulator dissipation is calculated using: (2) Power dissipation resulting from quiescent current is negligible. Regulator Protection The TPS797xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the Figure 14. Typical Application Circuit input voltage drops below the output voltage (for example, during power down). Current is conducted from the output to the input and is not internally External Capacitor Requirements limited. If extended reverse voltage operation is anticipated, external limiting might be appropriate. Although not required, a 0.1 μF or larger input bypass capacitor, connected between IN and GND and The TPS797xx features internal current limiting. located close to the TPS797xx, is recommended, During normal operation, the TPS797xx limits output especially when a highly resistive power supply is current to approximately 190mA. When current powering the LDO in addition to other devices. Like limiting engages, the output voltage scales back all low-dropout regulators, the TPS797xx requires an linearly until the overcurrent condition ends. Take output capacitor connected between OUT and GND care not to exceed the power dissipation ratings of to stabilize the internal control loop. The minimum the package. recommended capacitance is 0.47 μF. Any 0.47μF capacitor is suitable. Capacitor values larger than Microcontroller Application 0.47 μF are acceptable. One application for which this device is particularly suited is providing a regulated input voltage and Power Dissipation and Junction Temperature power good (PG) supervisory signal to low-power Specified regulator operation is assured to a junction devices such as mixed-signal microcontrollers. The temperature of +85°C; restrict the maximum junction quiescent or ground current of the TPS797xx family is temperature to +85°C under normal operating typically 1.2 μA even at full load; therefore, the conditions. This restriction limits the power dissipation reduction in battery life by including the TPS797xx in the regulator can handle in any given application. To the system is negligible. ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(MAX), and the actual dissipation, PD, which must be less than or equal to PD(MAX). Copyright © 2001–2012, Texas Instruments Incorporated Submit Documentation Feedback 9 |
Similar Part No. - TPS797285DCKR |
|
Similar Description - TPS797285DCKR |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
