EC5420A

High Slew Rate Rail-to-Rail

Quad Operational Amplifiers

Page 6 of 10

Revision 2008/12/25

Applications Information

Product Description

The EC5420A rail-to-rail quad channels amplifier is built on an advanced high voltage CMOS process. It’s beyond rails

input capability and full swing of output range made itself an ideal amplifier for use in a wide range of general-purpose

applications. The features of 20V/µS high slew rate, fast settling time, 8MHz of GBWP as well as high output driving

capability have proven the EC5420A a good voltage reference buffer for TFT-LCD for applications. High phase margin

make the EC5420A ideal for Connected in voltage follower mode for high drive applications

Supply Voltage, Input Range and Output Swing

The EC5420A can be operated with a single nominal wide supply voltage ranging from 4.5V to 18V with stable

performance over operating temperatures of -20 °C to +85 °C.

With 500mV greater than rail-to-rail input common mode voltage range and 80dB of Common Mode Rejection Ratio,

the EC5420A allows a wide range sensing among many applications without having any concerns over exceeding the

range and no compromise in accuracy. The output swings of the EC5420A typically extend to within 80mV of positive

and negative supply rails with load currents of 5mA. The output voltage swing can be even closer to the supply rails by

merely decreasing the load current. Figure 1 shows the input and output waveforms for the device in the unity-gain

configuration. The amplifier is operated under ±5V supply with a 10k load connected to GND. The input is a 10Vp

　

-p

sinusoid. An approximately 9.985 Vp-p of output voltage swing can be easily achieved.

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

Output Short Circuit Current Limit

A +/-150mA short circuit current will be limited by the EC5420A if the output is directly shorted to the positive or the

negative supply. For an indefinitely output short circuit, the power dissipation could easily increase such that the device

may be damaged. The internal metal interconnections are well designed to prevent the output continuous current from

exceeding +/-30 mA such that the maximum reliability can be well maintained.