1 Features
• High output current: ±150-mA typical ISC at 5.5 V
• Fast enable from shutdown: 1-μs typical
• Wide operational supply voltage: 1.5 V to 5.5 V
• Low input offset voltage: ±250-μV typical
• Fail-safe inputs: No diode from inputs to V+
• Optimized quiescent current: 165-μA/ch typical
• Rail-to-rail input and output
• Gain bandwidth product: 3-MHz typical at 5.5 V
• Thermal noise floor: 16-nV/√Hz typical
• Unity-gain stable
• Drives up to 250-pF without sustained oscillations
• Internal RFI and EMI filtered input pins
• Operating temperature range: –40°C to 125°C

2 Applications
• Optical modules
• Reference buffers, guard amplifiers
• Microphone pre-amplifiers
• Lighting and LED Drivers
• 4-20 mA loop drivers
• Programmable current source
• Low side current sensing circuitry

3 Description
The OPAx310 family of op amps includes single
(OPA310), dual (OPA2310), and quad-channel
(OPA4310), 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
OPAx310S also features a very fast shutdown
response and has a typical enable, disable time of 1
μs that allows for power savings when the application
involves duty cycling the amplifier signal chain.
OPAx310 family has a 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 package variants and has an internal current limit
protection, 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. Additional
output current capability may be achieved by carefully
connecting multiple op amps in parallel. OPAx310
devices are an 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 robust design of the OPAx310 family simplifies
circuit design. These op amps feature an integrated
RFI and EMI rejection filter with no-phase reversal in
input overdrive conditions. These devices also deliver
excellent AC performance with a gain bandwidth of
3 MHz and can drive up to 250 pF of cap load
with no sustained oscillations, enabling designers
to achieve both improved performance and a lowerpower
consumption.