OPA310 datasheet(26/55 Pages) TI

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8 Detailed Description

8.1 Overview

The OPAx310 family of op amps includes single (OPA310), dual (OPA2310), and quad-channel (OPA4310),

ultra-low-voltage (1.5 V to 5.5 V), high output current operational amplifiers (op amps) with rail-to-rail input and

output swing capabilities. The OPAx310 also features a very fast shutdown response and has an enable time

specification of just 0.9-µs typical. This feature allows for power savings when the application involves duty

cycling the amplifier signal chain. OPAx310 has robust ESD performance with fail safe input ESD structure

where there are no diodes connected from inputs to the positive power supply rail.

OPAx310 is offered in power pad, standard, small size packages and has an internal current limit, thermal

shutdown protection that enables additional robustness when operating with high output current. OPAx310 can

swing very close to the rails and has a short circuit current of ±75-mA minimum across temperature at 5.5-V

power supply while consuming just 165 μA of quiescent current. This combination of low voltage, low IQ, and

high output current capability makes this device quite unique and an excellent choice for a wide range of

general-purpose and high current applications. Additional output current capability can be easily achieved by

connecting multiple op amps in parallel. These devices are excellent choice for LED driver, LCD driver, Laser

driver, TEC driver applications and can also be used as a reference buffer, guard amplifier or as a discrete LDO.

The input common-mode voltage range includes both rails, and allows the OPAx310 series to be used in many

single-supply or dual supply configurations. Rail-to-rail input and output swing significantly increases dynamic

range, especially in low-supply applications, and makes these devices an excellent choice for driving low speed

sampling analog-to-digital converters (ADCs). Further, the class AB output stage is capable of driving smaller

resistive loads connected to any point between V+ and ground.

The OPAx310 can drive up to 75 pF with a typical phase margin of 40° and features 3 MHz gain bandwidth

product, 3 V/μs slew rate with 4 μVp-p integrated noise (0.1 Hz to 10 Hz) while consuming only 165 μA supply

current per channel, thus providing a good AC performance at a very low power consumption. DC applications

are also well served with a low input bias current (1 pA typical), a good input offset voltage (0.25 mV typical) and

a good PSRR (10 μV/V typical), CMRR (80 dB typical), and AOL (125 dB typical).

The robust design of the OPAx310 family simplifies circuit design. These op amps feature an integrated radio

frequency immunity (RFI) and electro-magnetic interfernce (EMI) rejection filter, unity-gain stability, and no-phase

reversal in input overdrive conditions.

8.2 Functional Block Diagram

Reference

Current

V+

IN-

IN+

(Ground)

BIAS2

BIAS1

Class AB

Control

Circuitry

OPA310, OPA2310, OPA4310

SBOSAA1C – APRIL 2022 – REVISED SEPTEMBER 2022

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