SGS Thomson Microelectronics L2750 Datasheet

HIGHOUTPUTCURRENT
VERYLOWSATURATION VOLTAGE
LOW VOLTAGEOPERATION
LOW INPUT OFFSETVOLTAGE
GND COMPATIBLEINPUTS
ST-BYFUNCTION (LOW CONSUMPTION)
HIGHAPPLICATIONFLEXIBILITY

L2750

DUAL LOW DROP HIGH POWER

OPERATIONAL AMPLIFIER

ADVANCE DATA

PROTECTIONS:

VERYINDUCTIVE LOADS
OVERRATINGCHIP TEMPERATURE
LOADDUMP VOLTAGE
FORTUITOUS OPEN GROUND
ESD

DESCRIPTION

The L2750 is a new technology class AB dual
power operational amplifier assembled in Multi­watt 11 package.

Thanks to the fully complementaryPNP/NPN out­put configurationthe L2750 can deliver a rail-to-

BLOCK DIAGRAM

Multiwatt-11

ORDERING NUMBER: L2750

rail output voltage swing even at the highest cur­rent.

Additional feature is the very low current Stand­By function.

Thehigh applicationflexibility of the L2750 makes
the device suitable for either motor driving/control
and audioapplicationspurposes.

October1991

This is advanced information on a new productnow in development or undergoing evaluation. Details are subject to change without notice.

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L2750

PIN CONNECTION (Top view)

ABSOLUTE MAXIMUMRATINGS

Symbol Parameter Value Unit

V

Sop

V

S max

V

PEAK

V
V
I

O

I

O

P

tot

T

stg,Tj

Operating Supply Voltage 18 V
Supply Voltage 28 V
Peak Supply Voltage (t = 50ms) 40 V
Input Voltage V

i

Differential Input Voltage V

i

Sop
Sop

Output Peak Current(non rep.t = 100µs) 5 A
Output Peak Current (rep. f > 10Hz) 4 A
Power Dissipation T

=85°C36W

CASE

Storage and JunctionTemperature -40 to 150 °C

V
V

THERMAL DATA

Symbol Description Value Unit

R

th j-case

Thermal Resistance Junction-case Max 1.8 °C/W

ELECTRICAL CHARACTERISTICS (Refer to the operational amplifier with GV= 24dB; VS= 14.4V;
T

=25°C,unless otherwisespecified

amb

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

I

d

V

OS

I

SB

I

S

I

OS

V

DROP

SR Slew Rate 4 V/µs

B Gain Bandwidth Prod 10 MHz

G

V

R

IN

E

IN

CMRR Common Mode Rejection Ratio 75 90 dB

Supply Voltage 4 18 V
Total Quiescent Drain Current 30 50 mA
Input Offset Voltage 5 mV
ST-BY Current Consumption 50 µA
Input Bias Current 0.5 µA
Input Offset Current 50 nA
Output Voltage Drop (High) IO= 0.5A

I

=3A

O

Output Voltage Drop (Low) I

O

I

O

= 0.5A
=3A

0.25

1.1

0.25
1

0.5

2.5

0.5
2

V
V

V
V

Open Loop Voltage Gain f = 1KHz 85 dB
Input Resistance 150 MΩ
Input Noise Voltage Rs= 0 to10KΩ f = 22Hzto 22KHz 3 µV

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ELECTRICALCHARACTERISTICS (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

SVR Supply Voltage Rejection R

C

T

Crosstalk f = 1KHz to 10KHz 80 dB

=0

s

f = 100Hz

75 90 dB

L2750

APPLICATIONSUGGESTION

The high flexibilitymakes the L2750 suitable for a
wide range of applications.

Motor Controller

The device can be utilized as a motor controller.
Fig.1 represents a bidirectional DC motor control
suitablefor logic driving. In thesekinds of applica­tion it is possible to take advantage of the high
current capability of the L2750 for driving several
types of low impedance motors in a broad range
of applications.Moreover the low dropallows high
start up currents even at lowest supplyvoltage.

Audio Applications

Another typical utilization of the L2750 concerns
the audio field, as follows:

1) DRIVER FOR BOOSTER: The remarkably low
distortionand noise makesthedeviceproperto
be used as high quality driver for main amplifi­ers (i.e. car radio boosters). An example is
shownby Fig. 5, where thegainis setto 24 dB
(see alsothe relevantcharacteristics).

2) CAR RADIO BOOSTERWITH DIFFERENTIAL
INPUT : Fig. 10 shows an exampleof carradio
booster, with a gain of 30 dB, that is specially
recommendedfor active loudspeakers.Among
itsmain featureis the differentialinputand sub­sequent high noise suppression. The typical
output power delivered into a 4Ω load is 24W

=14.4V;d =10%),as shownby thecharac-

(V

S

teristicsenclosed.

Figure2: Low Drop Voltage vs. Output Current

Figure3: High Drop Voltagevs. Output Current

Figure1

Figure4: Open Loop Gain vs. PhaseResponse

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