RT9133APQW datasheet(9/13 Pages) RICHTEK

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RT9133A/B

Preliminary

DS9133A/B-04 August 2007

www.richtek.com

Applications Information

The RT9133A/B has high performance to drive large load

for different application. High slew rates, rail-to-rail input

and output capability and low power consumption are the

features to make the RT9133A/B ideal for LCD applications.

The RT9133A/B also has wide bandwidth and phase margin

to drive a load of 10k

Ω and 10pF.

Operating Voltage

The RT9133A/B is specified with single supply voltage

from 5V to 15V. According to the electrical characteristics,

the total supply voltage range is guaranteed from 4.5V to

15V. To refer the typical operational curves can get stable

specifications in wide range of temperature and operating

voltage.

The output swing of the RT9133A/B typically extends to

within 80mV of positive/negative supply rails with 5mA

load current source/sink. Decreasing the load current will

get output swing even closer to the supply rails. Figure 1

shows the rail-to-rail input and output waveforms in the

unit gain configuration without load current. The supply

rails are +/-5V. Applying an input 10Vp_p sinusoidal

waveform results in a 9.8Vp_p output voltage as shown in

Figure 1.

Power Dissipation

The maximum power dissipation depends on the thermal

resistance of IC package, PCB layout, the rate of

surroundings airflow and temperature difference between

Figure 1. Operation with Rail-to-Rail Input and Output

Time (250

μs/Div)

junction to ambient. The maximum power dissipation can

be calculated by following formula:

PD(MAX) = ( TJ(MAX) - TA ) /

θJA

Where

TJ(MAX): The maximum operation junction temperature

150

°C

TA : The ambient temperature.

θJA : The junction to ambient thermal resistance.

The recommended operating condition of RT9133A/B is

below the maximum junction temperature 150

°C of the

die. The junction to ambient thermal resistance for

SOT-23-5 package is 250

°C/W, WDFN-6L 2x2 package

is 165

°C/W and MSOP-8 package is 160°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) = (150

°C−25°C) / 250 = 500mW (SOT-23-5)

PD(MAX) = (150

°C−25°C) / 165 = 758mW (WDFN-6L 2x2)

PD(MAX) = ( 150

°C - 25°C ) / 160 = 781mW (MSOP-8)

For continuous operation, do not exceed absolute

maximum operation junction temperature 150

°C. The

power dissipation definition for the RT9133A/B is as

following:

PD = (VS - VOUT) x ILoad

VS : the supply voltage

VOUT : the output voltage

ILoad : the output load current

The maximum power dissipation depends on operating

ambient temperature for fixed TJ(MAX) and thermal

resistance

θJA. Figure 2 shows the power dissipation

derating curves of the RT9133A/B with different packages.

As the ambient temperature increases, the maximum

power dissipation decreases linearly to keep the junction

temperature below 150

°C.

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