Electronic Components Datasheet Search |
|
TPS2211A Datasheet(PDF) 14 Page - Texas Instruments |
|
|
TPS2211A Datasheet(HTML) 14 Page - Texas Instruments |
14 / 19 page TPS2211A SINGLE-SLOT PC CARD POWER INTERFACE SWITCH FOR PARALLEL PCMCIA CONTROLLERS SLVS282A – SEPTEMBER 2000 – REVISED NOVEMBER 2002 14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION 12-V supply not required Most PC Card switches use the externally supplied 12 V to power gate drive and other chip functions, which require that power be present at all times. The TPS2211A offers considerable power savings by using an internal charge pump to generate the required higher voltages from the 5-V input. Therefore, the external 12-V supply can be disabled except when needed for flash-memory functions, thereby extending battery lifetime. Do not ground the 12-V switch inputs when the 12-V input is not used. Additional power savings are realized by the TPS2211A during a software shutdown, in which quiescent current drops to a maximum of 1 µA. 3.3-V low-voltage mode The TPS2211A operates in a 3.3-V low-voltage mode when 3.3 V is the only available input voltage (VI(5V) = 0). This allows host and PC Cards to be operated in low-power 3.3-volts-only modes such as sleep or pager modes. Note that in these operation modes, the TPS2211A derives its bias current from the 3.3-V input pin and only 3.3 V can be delivered to the PC Card. voltage transitioning requirement PC Cards are migrating from 5 V to 3.3 V to minimize power consumption, optimize board space, and increase logic speeds. The TPS2211A meets all combinations of power delivery as currently defined in the PCMCIA standard. The latest protocol accommodates mixed 3.3-V/5-V systems by first powering the card with 5 V, then polling it to determine its 3.3-V compatibility. The PCMCIA specification requires that the capacitors on 3.3-V compatible cards be discharged to below 0.8 V before applying 3.3-V power. This functions as a power reset and ensures that sensitive 3.3-V circuitry is not subjected to any residual 5-V charge. The TPS2211A offers a selectable VCC and Vpp ground state, in accordance with PCMCIA 3.3-V/5-V switching specifications. output ground switches PC Card specification requires that VCC be discharged within 100 ms. PC Card resistance can not be relied on to provide a discharge path for voltages stored on PC Card capacitance because of possible high-impedance isolation by power-management schemes. power-supply considerations The TPS2211A has multiple pins for each of its 3.3-V and 5-V power inputs and for the switched AVCC outputs. Any individual pin can conduct the rated input or output current. Unless all pins are connected in parallel, the series resistance is significantly higher than that specified, resulting in increased voltage drops and lost power. It is recommended that all input and output power pins be paralleled for optimum operation. To increase the noise immunity of the TPS2211A, the power supply inputs should be bypassed with a 4.7- µF, or larger, electrolytic or tantalum capacitor paralleled by a 0.1- µF ceramic capacitor. It is strongly recommended that the switched outputs be bypassed with a 0.1- µF, or larger, ceramic capacitor; doing so improves the immunity of the TPS2211A to electrostatic discharge (ESD). Care should be taken to minimize the inductance of PCB traces between the TPS2211A and the load. High switching currents can produce large negative voltage transients, which forward biases substrate diodes, resulting in unpredictable performance. Similarly, no pin should be taken below – 0.3 V. |
Similar Part No. - TPS2211A |
|
Similar Description - TPS2211A |
|
|
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 |