RT9198-34PB datasheet(10/18 Pages) RICHTEK

Part #	RT9198-34PB

Description	Low-Noise for RF Application, Fast Response in Line/Load Transient

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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RT9198/A

10

DS9198/A-14 April 2011

www.richtek.com

For recommended operating conditions specification of

RT9198/A, where TJ(MAX) is the maximum junction

temperature of the die (125

°C) and TA is the maximum

ambient temperature. The junction to ambient thermal

resistance (

θJA is layout dependent) for TSOT-23-3/TSOT-

23-5/SOT-23-3/SOT-23-5 package is 250

°C/W, SC-70-5

and SC-82 package is 333

°C/W and WDFN-6L 2x2

package is 165

°C/W on standard JEDEC 51-3 thermal

test board. The maximum power dissipation at TA = 25

°C

can be calculated by following formula :

PD(MAX) = (125

°C − 25°C)/250 = 400mW (TSOT-23-3/

TSOT-23-5/SOT-23-3/SOT-23-5)

PD(MAX) = (125

°C − 25°C)/333 = 300mW (SC-70-5/SC-82)

PD(MAX) = (125

°C − 25°C) / 165 = 606mW (WDFN-6L 2x2)

The maximum power dissipation depends on operating

ambient temperature for fixed TJ(MAX) and thermal

resistance

θJA. For RT9198/A packages, the Figure 2. of

derating curves allows the designer to see the effect of

rising ambient temperature on the maximum power

allowed.

Figure 2. Derating Curve for Packages

0

100

200

300

400

500

600

700

0

153045607590

105 120 135

Ambient Temperature (°C)

SOT-23-3/SOT-23-5

TSOT-23-3/TSOT-23-5

SC 70-5

SC-82

WDFN-6L 2x2

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RT9198-34PB Datasheet(PDF) 10 Page - Richtek Technology Corporation

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