Apex PA26, PA25A, PA25, PA21A, PA21 Datasheet

POWER DUAL OPERATIONAL AMPLIFIERS

PA21/25/26 • PA21A/25A

MICROTECHNOLOGY

FEATURES

• LOW COST

• WIDE COMMON MODE RANGE —
Includes negative supply

• WIDE SUPPLY VOLTAGE RANGE
Single supply: 5V to 40V

Split supplies: ±2.5V to ±20V

• HIGH EFFICIENCY — |Vs–2.2V| at 2.5A typ

• HIGH OUTPUT CURRENT — 3A min (PA21A)

• INTERNAL CURRENT LIMIT

• LOW DISTORTION

APPLICATIONS

• HALF & FULL BRIDGE MOTOR DRIVERS

• AUDIO POWER AMPLIFIER
STEREO — 18W RMS per channel
BRIDGE — 36W RMS per package

• IDEAL FOR SINGLE SUPPLY SYSTEMS
5V — Peripherals
12V — Automotive
28V — Avionic

DESCRIPTION

The amplifiers consist of a monolithic dual power op amp
in a 8-pin hermetic TO-3 package (PA21 and PA25) and a 12­pin SIP package (PA26). Putting two power op amps in one
package and on one die results in an extremely cost effective
solution for applications requiring multiple amplifiers per
board or bridge mode configurations.

The wide common mode input range includes the negative
rail, facilitating single supply applications. It is possible to
have a “ground based” input driving a single supply amplifier
with ground acting as the “second” or “bottom” supply of the
amplifier.

The output stages are also well protected. They possess
internal current limit circuits. While the device is well pro­tected, the Safe Operating Area (SOA) curve must be ob­served. Proper heatsinking is required for maximum reliabil­ity.

This hybrid integrated circuit utilizes thick film (cermet)
resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter­connections at all operating temperatures. The 8-pin TO-3
package is hermetically sealed and electrically isolated. The
use of compressible isolation washers voids the warranty.
The tab of the SIP12 plastic package is tied to –V

TYPICAL APPLICATION

R1 and R2 set up amplifier A in a non-inverting gain of 2.8.
Amp B is set up as a unity gain inverter driven from the output
of amp A. Note that amp B inverts signals about the reference
node, which is set at mid-supply (14V) by R5 and R6. When the
command input is 5V, the output of amp A is 14V. Since this is
equal to the reference node voltage, the output of amp B is also
14V, resulting in 0V across the motor. Inputs more positive
than 5V result in motor current flow from left to right (see Figure

1). Inputs less positive than 5V drive the motor in the opposite
direction.

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.

S

R1

5K

COMMAND

INPUT

0/10V

R2
9K

+28V

–

A B

+

1/2 PA21

M

R3

R4

1/2 PA21

10K

10K

+28V

–

+

R5

10K

R6

10K

FIGURE 1: BIDIRECTIONAL SPEED CONTROL FROM

A SINGLE SUPPLY

The amplifiers are especially well-suited for this application.
The extended common mode range allows command inputs
as low as 0V. Its superior output swing abilities let it drive within
2V of supply at an output current of 2A. This means that a
command input that ranges from 0V to 10V will drive a 24V
motor from full scale CCW to full scale CW at up to ±2A. A
single power op amp with an output swing capability of Vs –6
would require ±30V supplies and would be required to swing
48V p-p at twice the speed to deliver an equivalent drive.

EXTERNAL CONNECTIONS

PA26

Connect pins
3 and 10 to pin 7
and connect pins
4 and 9 to pin 6
unless special
functions are re­quired.

+IN, A

3

–IN, A

4

– +

5

OUT, A

TOP VIEW

–V

S

6

PA25

+V

A

+IN, B

+

A

–

123456789101112

S

/+V

–IN A

+IN A

BOOST

V

S

2

OUT, B

1

B

–+

8

–IN, B

7

S

/–V

SENSE

I

SUB

S+VS

–V

OUT A

–IN, A

4

+IN, A

5

+IN, B

–IN, B

/–V

OUT B

I

3

6

+

B

–

S

SENSE

S

/+V

BOOST

V

+V

A

B

PA21

2

–V

–IN B

S

7

S

+IN B

OUT, A

1

8

OUT, B

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PA21/25/26 • PA21A/25A

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, total 5V to 40V
OUTPUT CURRENT SOA
POWER DISSIPATION, internal (per amplifier) 25W
POWER DISSIPATION, internal (both amplifiers) 36W
INPUT VOLTAGE, differential ±V
INPUT VOLTAGE, common mode +VS, -VS–.5V
JUNCTION TEMPERATURE, max

1

S

150°C
TEMPERATURE, pin solder—10 sec max 300°C
TEMPERATURE RANGE, storage –65°C to 150°C
OPERATING TEMPERATURE RANGE, case –55°C to 125°C

SPECIFICATIONS

PARAMETER TEST CONDITIONS

PA21/25/26

2

MIN TYP MAX MIN TYP MAX UNITS

PA21A/PA25A

INPUT

OFFSET VOLTAGE, initial 1.5 10 .5 4 mV
OFFSET VOLTAGE, vs. temperature Full temperature range 15 10 µV/°C
BIAS CURRENT, initial 35 1000 * 250 nA
COMMON MODE RANGE Full temperature range –VS–.3 +VS–2* * V
COMMON MODE REJECTION, DC Full temperature range 60 85 * * dB
POWER SUPPLY REJECTION Full temperature range 60 80 * * dB
CHANNEL SEPARATION I

= 1A, F = 1kHz 50 68 * * dB

OUT

GAIN

OPEN LOOP GAIN Full temperature range 80 100 * * dB
GAIN BANDWIDTH PRODUCT AV = 40dB 600 * kHz
PHASE MARGIN Full temperature range 65 * °
POWER BANDWIDTH V

= 28V 13.6 * kHz

O(P-P)

OUTPUT

CURRENT, peak 2.5 3 A
CURRENT, limit 3.0 4.0 A
SLEW RATE .5 1.2 * * V/µs
CAPACITIVE LOAD DRIVE AV = 1 .22 * µF
VOLTAGE SWING Full temp. range, IO = 100mA |VS| –1.0 |VS| –0.8 * * V
VOLTAGE SWING Full temp. range, IO = 1A |VS| –1.8 |VS| –1.4 * * V
VOLTAGE SWING IO = 2.5A (PA21, 25) |VS| –3.0 |VS| –2.8 V
VOLTAGE SWING IO = 3.0A (PA21A, PA25A) |VS| –4.0 |VS| –3.5 V

POWER SUPPLY

VOLTAGE, V
CURRENT, quiescent, total 45 90 * * mA

3

SS

4

5

30 40 * * * V

THERMAL

RESISTANCE, junction to case
DC, single amplifier 5.0 * °C/W
DC, both amplifiers
AC, single amplifier 3.7 °C/W
AC, both amplifiers

5

5

3.4 * °C/W

2.4 °C/W
RESISTANCE, junction to air 30 * °C/W
TEMPERATURE RANGE, case Meets full range specifications –25 85 –25 85 °C

NOTES: * The specification of PA21A/PA25A is identical to the specification for PA21/PA25 in applicable column to the left.

1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF.

2. Unless otherwise noted, the following conditions apply: ±V

3. +VS and –VS denote the positive and negative supply rail respectively. VSS denotes the total rail-to-rail supply voltage.

= ±15V, TC = 25°C.

S

4. Current limit may not function properly below VSS = 6V, however SOA violations are unlikely in this area.

5. Rating applies when power dissipation is equal in the two amplifiers.

CAUTION

The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes. (PA21 and PA25 only. PA26 does not contain
BeO).

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]