RT9013A View Datasheet(PDF) - Richtek Technology

Part Name

Description

Manufacturer

RT9013A

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

Richtek Technology 

RT9013A

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 RT9013A packages, the Figure 2 of derating curves

allows the designer to see the effect of rising ambient

temperature on the maximum power allowed.

0.7

Single Layer PCB

0.6

0.5

0.4

SC-70-5/SC-82

0.3

0.2

0.1

0

0 12.5 25 37.5 50 62.5 75 87.5 100 113 125

Ambient Temperature (°C)

Figure 2. Derating Curves for RT9013A Packages

www.richtek.com

8

DS9013A-02 April 2011

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