RT9136 datasheet(9/11 Pages) RICHTEK

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RT9136

DS9136-03 June 2011

www.richtek.com

Figure 2. V-com Test Circuit

Applications Information

The RT9136 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

RT9136 ideal for LCD applications. The RT9136 also has

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

and 10pF.

Operating Voltage

The RT9136 is specified with a single nominal supply

voltage from 5V to 15V or a split supply with its total

range from 5V to 15V. Correct operation is guaranteed for

a supply range of 4.5V to 16.5V.

RT9136 specifications are stable over both the full supply

range and operating temperatures of

−40°C to 85°C .

Parameter variations with operating voltage and/or

temperature are shown in the typical performance curves.

The output swing of the RT9136 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.

Short Circuit Condition

An internal short-circuit protection circuit is implemented

to protect the device from output short circuit. The RT9136

limits the short circuit current to

±120mA if the output is

directly shorted to positive/negative supply rails. For

reliability, the continuous output current more than

±35mA

is not recommended.

Unused Amplifier

If the amplifier is unused. It is recommended to connect

the positive input to ground and keep the output pin as

open.

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

LCD Panel Applications

The RT9136 is mainly designed for LCD gamma and

V-com buffer. OP Amplifier-C has 120mA instantaneous

source/sink peak current. To test the performance of the

RT9136 for LCD driving capability, the test circuit is to

simulate the V-com driver as shown Figure 2. Series

capacitors and resistors connected to the output of the

OP simulate the load of LCD panel. The 300

Ω and 3kΩ

feedback resistors are used to improve the settling time.

This circuit is the worst case for a V-com buffer. Figure 3

shows the waveforms of the output peak current capability.

Time (250

μs/Div)

300

VIN 0V to 8V

Output Current

Test Point

Square Wave

10nF

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