17

relative to the GND pin. Letting the CE pin float will enable

the amplifier. Hence, the 8-pin PDIP and SOIC single amps

are pin compatible with standard amplifiers that don’t have a

power down feature.

Short Circuit Current Limit

The EL5144 series amplifiers do not have internal short

circuit protection circuitry. Short circuit current of 90mA

sourcing and 65mA sinking typically will flow if the output is

trying to drive high or low but is shorted to half way between

the rails. If an output is shorted indefinitely, the power

dissipation could easily increase such that the part will be

destroyed. Maximum reliability is maintained if the output

current never exceeds

±50mA. This limit is set by internal

metal interconnect limitations. Obviously, short circuit

conditions must not remain or the internal metal connections

will be destroyed.

Power Dissipation

With the high output drive capability of the EL5144 series

amplifiers, it is possible to exceed the 150

°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 or package type 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:

θ

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 load, or:

where:

N = Number of amplifiers in the package

allowed.

EL5144 Series Comparator Application

The EL5144 series amplifier can be used as a very fast,

single supply comparator. Most op amps used as a

comparator allow only slow speed operation because of

output saturation issues. The EL5144 series amplifier

doesn’t suffer from output saturation issues. Figure 3 shows

the amplifier implemented as a comparator. Figure 4 is a

PD

MAX

T

θ

JA

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

=

PD

MAX

NV

S

I

SMAX

V

S

(

- V

V

OUT

R

L

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

×

+

×

×

=

PART

PACKAGE

EL5144CW

SOT23-5

37

EL5146CS

SOIC-8

21

EL5146CN

PDIP-8

14

EL5244CS

SOIC-8

48

EL5244CN

PDIP-8

30

EL5244CY

MSOP-8

69

EL5246CY

MSOP-10

69

EL5246CS

SOIC-14

34

EL5246CN

PDIP-14

23

EL5444CU

QSOP-16

139

EL5444CS

SOIC-14

85

EL5444CN

PDIP-14

51

R

L

V

OUT

V

()

×

T

N

θ

JA

×

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







- V

S

I

SMAX

×

()

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

=

EL5144, EL5146, EL5244, EL5246, EL5444