8 Detailed Description

8.1 Overview

The OPAx310 family of opamps 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 a enable/disable

time specification of just 1 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 suitable for suitable 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 ideal 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 45° and features 3 MHz gain bandwidth

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 of 1 pA (typical), an input offset voltage of 0.15 mV (typical) and

The robust design of the OPAx310 family simplifies circuit design. These op famps feature an integrated RFI and

EMI rejection filter, unity-gain stability, and no-phase reversal in input overdrive conditions.

OPA310, OPA2310, OPA4310

SBOSAA1 – APRIL 2022

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