EL5420CSZ datasheet(12/20 Pages) INTERSIL

12 / 20 page

FN7186.6

March 4, 2009

Applications Information

Product Description

The EL5120, EL5220, and EL5420 voltage feedback

amplifiers are fabricated using a high voltage CMOS

process. They exhibit rail-to-rail input and output capability,

they are unity gain stable, and have low power consumption

(500µA per amplifier). These features make the EL5120,

EL5220, and EL5420 ideal for a wide range of general-

purpose applications. Connected in voltage follower mode

and driving a load of 10k

Ω and 12pF, the EL5120, EL5220,

and EL5420 have a -3dB bandwidth of 12MHz while

maintaining a 10V/µs slew rate. The EL5120 is a single

amplifier, the EL5220 is a dual amplifier, and the EL5420 is a

quad amplifier.

Operating Voltage, Input, and Output

The EL5120, EL5220, and EL5420 are 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. Most

EL5120, EL5220, and EL5420 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 input common-mode voltage range of the EL5120,

EL5220, and EL5420 extends 500mV beyond the supply

rails. The output swings of the EL5120, EL5220, and

EL5420 typically extend to within 80mV of positive and

negative supply rails with load currents of 5mA. Decreasing

load currents will extend the output voltage range even

closer to the supply rails. Figure 25 shows the input and

output waveforms for the device in the unity-gain

configuration. Operation is from ±5V supply with a 10k

Ω load

connected to GND. The input is a 10VP-P sinusoid. The

output voltage is approximately 9.985VP-P.

FIGURE 25. OPERATION WITH RAIL-TO-RAIL INPUT AND

OUTPUT

Short Circuit Current Limit

The EL5120, EL5220, and EL5420 will limit the short circuit

current to ±120mA if the output is directly shorted to the

positive or the negative supply. If an output is shorted

indefinitely, the power dissipation could easily increase such

that the device may be damaged. Maximum reliability is

maintained if the output continuous current never exceeds

±30mA. This limit is set by the design of the internal metal

interconnects.

Output Phase Reversal

The EL5120, EL5220, and EL5420 are immune to phase

reversal as long as the input voltage is limited from (VS-)

-0.5V to (VS+) +0.5V. Figure 26 shows a photo of the output

of the device with the input voltage driven beyond the supply

rails. Although the device's output will not change phase, the

input's overvoltage should be avoided. If an input voltage

exceeds supply voltage by more than 0.6V, electrostatic

protection diodes placed in the input stage of the device

begin to conduct and overvoltage damage could occur.

FIGURE 26. OPERATION WITH BEYOND-THE-RAILS INPUT

Power Dissipation

With the high-output drive capability of the EL5120, EL5220,

and EL5420 amplifiers, it is possible to exceed the +125°C

“absolute-maximum junction temperature” under certain load

current conditions. Therefore, it is important to calculate the

maximum junction temperature for the application to

determine if load conditions need to be modified for the

amplifier to remain in the safe operating area.

The maximum power dissipation allowed in a package is

determined according to Equation 1:

where:

•TJMAX = Maximum junction temperature

•TAMAX = Maximum ambient temperature

•

JA = Thermal resistance of the package

•PDMAX = Maximum power dissipation in the package

The maximum power dissipation actually produced by an IC

is the total quiescent supply current times the total power

VS = ±5V

TA = +25°C

AV = 1

VIN = 10VP-P

VS = ±2.5V

TA = +25°C

AV = 1

VIN = 6VP-P

100µs

DMAX

JMAX

AMAX

–

---------------------------------------------

(EQ. 1)

EL5120, EL5220, EL5420

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