TPS2216ADAP datasheet(21/27 Pages) TI

21 / 27 page

TPS2214A, TPS2216A

LOW-COST DUAL-SLOT PC CARD POWER SWITCH

FOR SERIAL PCMCIA CONTROLLERS

SLVS267 – DECEMBER 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

calculating junction temperature

The switch resistance, rDS(on), is dependent on the junction temperature, TJ, of the die. The junction temperature

is dependent on both rDS(on) and the current through the switch. To calculate TJ, first find rDS(on) from Figures 23

through 25, using an initial temperature estimate about 50

°C above ambient. Then calculate the power

dissipation for each switch, using the formula:

D +

DS(on)

Next, sum the power dissipation of all switches and calculate the junction temperature:

J +

RqJA ) TA

Where:

RθJA is the inverse of the derating factor given in the dissipation rating table.

Compare the calculated junction temperature with the initial temperature estimate. If the temperatures are not

within a few degrees of each other, recalculate using the calculated temperature as the initial estimate.

logic inputs and outputs

The serial interface consists of DATA, CLOCK, and LATCH leads. The data is clocked in on the positive edge

of the clock (see Figures 2 and 3). The 11-bit (D0–D10) serial data word is loaded during the positive edge of

the latch signal. The positive edge of the latch signal should occur before the next positive edge of the clock

occurs.

The TPS2216 serial interfaces are compatible with serial-interface PCMCIA controllers and current PCMCIA

and Japan Electronic Industry Development Association (JEIDA) standards.

An overcurrent output (OC) is provided to indicate an overcurrent or overtemperature condition in any of the

xVCC and xVPP outputs as previously discussed.

TPS2216ADAP 数据表(PDF) 21 Page - Texas Instruments