ISL24020IHTZ-T7 datasheet(8/10 Pages) INTERSIL

Il numero della parte	ISL24020IHTZ-T7

Spiegazioni elettronici	Low Cost, 60MHz Rail-to-Rail Input-Output Op-Amp

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Produttore elettronici	INTERSIL [Intersil Corporation]

Homepage	http://www.intersil.com/cda/home

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8 / 10 page

8

FN6735.0

October 2, 2008

Applications Information

Product Description

The ISL24020 voltage feedback amplifier is fabricated using

a high voltage CMOS process. It exhibits rail-to-rail input and

output capability, is unity gain stable and has low power

consumption (2.5mA). These features make the ISL24020

ideal for a wide range of general-purpose applications.

Connected in voltage follower mode and driving a load of

1k

Ω, the ISL24020 has a -3dB bandwidth of 60MHz while

maintaining a 75V/µs slew rate.

Operating Voltage, Input, and Output

The ISL24020 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. Most ISL24020 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” on page 3.

The input common-mode voltage range of the ISL24020

extends 500mV beyond the supply rails. The output swings

of the ISL24020 typically extend to within 100mV 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 26 shows the

input and output waveforms for the device in the unity-gain

configuration. Operation is from ±5V supply with a 1k

Ω load

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

output voltage is approximately 9.8VP-P.

Short Circuit Current Limit

The ISL24020 will limit the short circuit current to ±180mA 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 ±65mA. This limit is set by

the design of the internal metal interconnects.

Output Phase Reversal

The ISL24020 is immune to phase reversal as long as the

input voltage is limited from VS- -0.5V to VS+ +0.5V.

Figure 27 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.

Power Dissipation

With the high-output drive capability of the ISL24020

amplifier, 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:

where:

•TJMAX = Maximum junction temperature

•TAMAX = Maximum ambient temperature

•

ΘJA = 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

supply voltage, plus the power in the IC due to the loads, or:

when sourcing, and:

when sinking.

5V

10µs

VS = ±5V, TA = +25°C, AV = 1, VIN = 10VP-P

FIGURE 26. OPERATION WITH RAIL-TO-RAIL INPUT AND

OUTPUT

1V

10µs

VS = ±2.5V, TA = +25°C, AV = 1, VIN = 6VP-P

FIGURE 27. OPERATION WITH BEYOND-THE-RAILS INPUT

P

DMAX

T

JMAX

T

AMAX

–

θ

JA

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

=

(EQ. 1)

P

DMAX

ΣiV

[

S

I

SMAX

V

(

S+VOUTi )

I

LOADi

×

–

+

×]

=

(EQ. 2)

P

DMAX

ΣiV

[

S

I

SMAX

V

(

OUTiVS- )

I

LOADi

×

–

+

×]

=

(EQ. 3)

ISL24020

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