RT9833B-24GY datasheet(10/11 Pages) RICHTEK

Part #	RT9833B-24GY

Description	Micro-Power Voltage Detectors

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Manufacturer	RICHTEK [Richtek Technology Corporation]

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RT9833

10

DS9833-00 May 2013

www.richtek.com

©

is a registered trademark of Richtek Technology Corporation.

Application Information

Multiple Supplies

Mainly, the pull-up connected to the RT9833 will connect

to the supply voltage that is being monitored at the IC's

VCC pin. However, some systems may use the open-

drain output to level-shift from the monitored supply to

reset circuitry powered by some other supply.

Benefits of Highly Accurate Reset Threshold

Most

μP supervisor ICs have reset threshold voltages

between 1% and 1.5% below the value of nominal supply

voltages. This ensures a reset will not occur within 1% of

the nominal supply, but will occur when the supply is 1.5%

below nominal.

Thermal Considerations

For continuous operation, do not exceed absolute

maximum junction temperature. The maximum power

dissipation depends on the thermal resistance of the IC

package, PCB layout, rate of surrounding airflow, and

difference between junction and ambient temperature. 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, TAis

the ambient temperature, and

θJAis the junction to ambient

thermal resistance.

For recommended operating condition specifications, the

maximum junction temperature is 125

°C. The junction to

ambient thermal resistance,

θJA, is layout dependent.

SC-82 package, the thermal resistance,

θJA, is 345.6°C/

W on a standard JEDEC 51-7 four-layer thermal test board.

The maximum power dissipation at TA = 25

°C can be

calculated by the following formula :

PD(MAX) = (125

°C − 25°C) / (345.6°C/W) = 0.29W for

SC-82 package

The maximum power dissipation depends on the operating

ambient temperature for fixed TJ(MAX) and thermal

resistance,

θJA. The derating curve in Figure 1 allows the

designer to see the effect of rising ambient temperature

on the maximum power dissipation.

Figure 1. Derating Curve of Maximum Power Dissipation

0.0

0.1

0.2

0.3

0.4

0.5

0

25

50

75

100

125

Ambient Temperature (°C)

Four-Layer PCB

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RT9833B-24GY Datasheet(PDF) 10 Page - Richtek Technology Corporation

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