8

FN7426.0

June 24, 2004

Applications Information

Product Description

The EL5027 unity gain buffer is fabricated using a high

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

output capability and has low power consumption (500µA

per buffer). These features make the EL5027 ideal for a wide

range of general-purpose applications. When driving a load

of 10k

Ω and 12pF, the EL5027 has a -3dB bandwidth of

2.5MHz and exhibits 2.2V/µs slew rate.

Operating Voltage, Input, and Output

The EL5027 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 EL5027 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 swings of the EL5027 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 1 shows

the input and output waveforms for the device. Operation is

from ±5V supply with a 10k

Ω load connected to GND. The

FIGURE 18. OPERATION WITH RAIL-TO-RAIL INPUT AND

OUTPUT

Short-Circuit Current Limit

The EL5027 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 EL5027 is immune to phase reversal as long as the

shows a photo of the output of the device with the input

voltage driven beyond the supply rails. Although the device's

Pin Descriptions

6-Pin tsot

Pin Name

Function

Equivalent Circuit

1

VINA

Buffer A Input

CIRCUIT 1

2

VS-

Negative Supply Voltage

3

VINB

Buffer B Input

(Reference Circuit 1)

4

VOUTB

Buffer B Output

CIRCUIT 2

5

VS+

Positive Supply Voltage

6

VOUTA

Buffer A Output

(Reference Circuit 2)

GND

5V

5V

10µs

EL5027