TLV704 datasheet(14/22 Pages) TI

14 / 22 page

Y ´

: T = T +

Y ´

: T = T +

(

)

OUT

(

)

Jmax

D max

TLV704

SBVS148D – OCTOBER 2010 – REVISED JANUARY 2015

www.ti.com

10.3 Power Dissipation and Junction Temperature

To ensure reliable operation, worst-case junction temperature should not exceed 125°C. This restriction limits the

power dissipation the regulator can handle in any given application. To 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).

The maximum power dissipation limit is determined using Equation 1:

(1)

where:

TJmax is the maximum allowable junction temperature.

RθJA is the thermal resistance junction-to-ambient for the package (see the Thermal Information table).

TA is the ambient temperature.

The regulator dissipation is calculated using Equation 2:

(2)

Power dissipation resulting from quiescent current is negligible.

10.4 Estimating Junction Temperature

The JEDEC standard now recommends the use of psi (

Ψ) thermal metrics to estimate the junction temperatures

of the LDO while in-circuit on a typical PCB board application. These metrics are not strictly speaking thermal

resistances, but rather offer practical and relative means of estimating junction temperatures. These psi metrics

are determined to be significantly independent of the copper-spreading area. The key thermal metrics (

ΨJT and

ΨJB) are given in the Thermal Information table and are used in accordance with Equation 3.

where:

•

PD is the power dissipated as explained in Thermal Information

•

TT is the temperature at the center-top of the device package

•

TB is the PCB surface temperature measured 1 mm from the device package and centered on the package

edge.

(3)

10.5 Package Mounting

Solder pad footprint recommendations for the TLV704 are available from the TI's website at www.ti.com through

the TLV704 series product folders. The recommended land pattern for the DBV package is appended to this data

sheet.

Submit Documentation Feedback

Product Folder Links: TLV704

TLV704 Datasheet(PDF) 14 Page - Texas Instruments

TLV704 Datasheet(HTML) 14 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Datasheet Download

Link URL