RT9013-28GB datasheet(8/10 Pages) RICHTEK

Part #	RT9013-28GB

Description	120mA, Low Dropout, Low Noise Ultra-Fast Without Bypass Capacitor CMOS LDO Regulator

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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8 / 10 page

RT9013A

8

DS9013A-02 April 2011

www.richtek.com

Figure 2. Derating Curves for RT9013A Packages

be calculated by following formula :

PD(MAX) = ( TJ(MAX)

− TA ) /θJA

Where TJ(MAX) is the maximum operation junction

temperature, TA is the ambient temperature and the

θJA is

the junction to ambient thermal resistance.

For recommended operating conditions specification of

RT9013A, where TJ(MAX) is the maximum junction

temperature of the die (125

°C) and TA is the operated

ambient temperature. The junction to ambient thermal

resistance for SC-70-5/SC-82 package is 333

°C/W on the

standard JEDEC 51-3 single-layer thermal test board. The

maximum power dissipation at TA= 25

°C can be calculated

by following formula :

PD(MAX) = (125

°C − 25°C) / 333°C/W = 0.3W for SC-70-5/

SC-82 packages

The maximum power dissipation depends on operating

ambient temperature for fixed TJ(MAX) and thermal resistance

θJA. For RT9013Apackages, the Figure 2 of derating curves

allows the designer to see the effect of rising ambient

temperature on the maximum power allowed.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0

12.5 25 37.5 50 62.5 75 87.5 100 113 125

Ambient Temperature (

°C)

Single Layer PCB

SC-70-5/SC-82

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RT9013-28GB Datasheet(PDF) 8 Page - Richtek Technology Corporation

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