6 Detailed Description

6.1 Overview

The OPAx310-Q1 family of op amps includes single (OPA310-Q1), dual (OPA2310-Q1), and quad-channel

(OPA4310-Q1), ultra-low-voltage (1.5V to 5.5V), high output current operational amplifiers (op amps) with rail-to-

rail input and output swing capabilities. The OPAx310-Q1 also features a very fast shutdown response and has

an enable time specification of just 0.9µs typical. This feature allows for power savings when the application

involves duty cycling the amplifier signal chain. OPAx310-Q1 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-Q1 is offered in standard packages and has an internal current limit, thermal shutdown protection that

enables additional robustness when operating with high output current. OPAx310-Q1 can swing very close to

the rails and has a short circuit current of ±75mA minimum across temperature at 5.5-V power supply while

consuming just 165μA 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 and other higher current 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-Q1 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-Q1 can drive up to 75pF with a typical phase margin of 40° and features 3MHz gain bandwidth

product, 3V/μs slew rate with 4μVp-p integrated noise (0.1Hz to 10Hz) while consuming only 165μA 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 (0.25mV typical) and

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

The robust design of the OPAx310-Q1 family simplifies circuit design. These op amps feature an integrated

radio frequency immunity (RFI) and electro-magnetic interference (EMI) rejection filter, unity-gain stability, and

no-phase reversal in input overdrive conditions.

OPA310-Q1

SBOSAI0A – DECEMBER 2023 – REVISED MAY 2024

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