RT9058-C0GVL datasheet(7/9 Pages) RICHTEK

Part #	RT9058-C0GVL

Description	36V, 2A IQ, 100mA Low Dropout Voltage Linear Regulator

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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7 / 9 page

RT9058

7

DS9058-00 April 2013

www.richtek.com

©

is a registered trademark of Richtek Technology Corporation.

Figure 1. Derating Curve of Maximum Power Dissipation

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0

25

50

75

100

125

Ambient Temperature (°C)

SOT-89-3

Four-Layer PCB

SOT-23-3

Applications Information

Like any low dropout linear regulator, the RT9058's external

input and output capacitors must be properly selected for

stability and performance. Use a 1

μF or larger input

capacitor and place it close to the IC's VCC and GND pins.

Any output capacitor meeting the minimum 1m

Ω ESR

(Equivalent Series Resistance) requirement may be used.

Place the output capacitor close to the IC's VOUT and

GND pins. Increasing capacitance and decreasing ESR

can improve the circuit's PSRR and line transient response.

Thermal Considerations

For continuous operation, do not exceed absolute the

maximum junction temperature. The maximum power

dissipation depends on the thermal resistance of the IC

package, PCB layout, rate of surrounding airflow, and the

allowed difference between the junction and ambient

temperatures. The maximum power dissipation can be

calculated by the following formula :

PD(MAX) = (TJ(MAX)

− TA) / θJA

where TJ(MAX) is the maximum junction temperature, TA is

the ambient temperature, and

θJA is the junction to ambient

thermal resistance.

The recommended operating conditions specify a

maximum junction temperature is 125

°C. The junction to

ambient thermal resistance,

θJA, is layout dependent. On

a standard JEDEC 51-7 four-layer thermal test board ,

the thermal resistance,

θJA, of the SOT-23-3 package is

243.3

°C/W. For the SOT-89-3 package, the θJA, is

167.7

°C/W. The maximum power dissipation at TA = 25°C

can be calculated by the following formula :

PD(MAX) = (125

°C − 25°C) / (243.3°C/W) = 0.41W for

SOT-23-3 package

PD(MAX) = (125

°C − 25°C) / (167.7°C/W) = 0.6W for

SOT-89-3 package

For a fixed TJ(MAX) of 125

°C, the maximum power

dissipation depends on the operating ambient temperature

and the package's thermal resistance,

θJA. The derating

curve in Figure 1 shows the effect of rising ambient

temperature on the maximum recommended power

dissipation.

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