RT9134

Preliminary

8

DS9134-04

August 2007

www.richtek.com

Applications Information

The RT9134 packaged in quad operational amplifiers 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

RT9134 ideal for LCD applications. The RT9134 also has

wide bandwidth and phase margin to drive a load of 10k

Ω

and 10pF.

Operating Voltage

The RT9134 is specified with single supply voltage from

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

To refer the typical operational curves can get stable

specifications in wide range of temperature and operating

voltage.

The output swing of the RT9134 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

junction to ambient. The maximum power dissipation can

be calculated by following formula :

Where

150

°C

The recommended operating condition of the RT9134 is

below 150

°C the maximum junction temperature of the

die. The junction to ambient thermal resistance (

layout dependent) for VQFN-16L 4x4 package is 54

°C/W

and TSSOP-14 package is 100

°C /W on the standard

JEDEC 51-7 4-layers thermal test board. The maximum

°C can be calculated by

following formula :

°C - 25°C ) / 54 = 2.315W fo rV QFN-16L

4x4 package

°C - 25°C ) / 100 = 1.250W for TSSOP-14

package

For continuous operation, do not exceed absolute

maximum operation junction temperature 150

°C. The

power dissipation definition for the RT9134 is as following:

The maximum power dissipation depends on operating

resistance

derating curves of the RT9134 with different packages.

As the ambient temperature increases, the maximum

power dissipation decreases linearly to keep the junction

temperature below 150

°C.

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

Time (250

μs/Div)