Texas Instruments LMV344MAX

Overview

LMV344MAX from Texas Instruments is a quad rail-to-rail output CMOS operational amplifier optimized for low-voltage portable applications. It operates from 2.7 V to 5.5 V, draws 100 µA per amplifier, delivers 1 MHz gain bandwidth and 1 V/µs slew rate, and features 20 fA input bias current - enabling precision sensing and battery-monitoring circuits in space-constrained handheld devices.

For engineers reviewing the LMV344MAX datasheet, LMV344MAX pinout, LMV344MAX application, or LMV344MAX equivalent, key selection considerations include its quad-channel TSSOP-14 package, rail-to-rail output swing within 24 mV of rails (at 2.7 V, RL = 2 kΩ), −40°C to +125°C industrial-plus temperature range, and ultra-low shutdown current (45 pA) - critical for always-on sensor nodes and energy-harvesting systems.

Technical Context

The LMV344MAX implements a patented Class AB turnaround stage that reduces input-referred voltage noise to 29 nV/√Hz at 10 kHz while maintaining low quiescent current. Its PMOS input stage enables 20 fA typical input bias current and high input impedance, supporting high-impedance source interfacing without significant error.

It supports true rail-to-rail output swing (within 24–60 mV of supply rails depending on load and voltage), operates across full 2.7 V–5.5 V supply range, and maintains stable unity-gain performance with capacitive loads up to 100 pF - verified by 72° phase margin at 100 kΩ load and 20 dB gain margin.

Key Specifications

Pinout & Package

Packaged in a 14-pin TSSOP (PW) with nominal body size 5.00 mm × 4.40 mm, the LMV344MAX provides four independent op-amp channels in a compact, surface-mount footprint suitable for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad operational amplifier applications.

Compared with TLV2464IDR and LMV324DR, the LMV344MAX uniquely combines ultra-low power (100 µA/ch), femtoampere input bias, and rail-to-rail output in a single quad package - making it the only option among the three qualified for precision, battery-constrained, high-impedance analog front-ends.

Availability

LMV344MAX is available at Aetrix Electronics and suitable for battery monitoring systems, portable medical sensors, industrial loop receivers, and audio line drivers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMV344MAX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog design and manufacturing excellence.

The LMV34x-N family was designed specifically for low-voltage portable electronics - emphasizing ultra-low power, rail-to-rail output, wide temperature operation, and miniature packaging for space-constrained battery-powered systems.

FAQ

What is the maximum capacitive load the LMV344MAX can drive while remaining stable?

The LMV344MAX maintains ≥72° phase margin with up to 100 pF capacitive load under standard test conditions (RL = 100 kΩ, VS = 5 V). This allows direct connection to ADC input capacitance or short PCB traces without external isolation resistors. For loads >100 pF, a series resistor (≥10 Ω) between output and capacitance is recommended to preserve stability, as confirmed in Figure 24 and Figure 25 of the SNOS990H datasheet.

Does the LMV344MAX have a shutdown feature like the LMV341-N?

No, the LMV344MAX does not include a shutdown pin. Only the LMV341-N (single-channel) variant features an active-low SHDN input. The LMV344MAX is a quad amplifier without integrated shutdown control - all four channels operate continuously when powered. Power gating must be implemented externally via supply switching if ultra-low standby current is required.

What is the input common-mode voltage range for the LMV344MAX at 2.7 V supply?

At 2.7 V supply, the LMV344MAX supports an input common-mode voltage range from V− (0 V) to V+ − 0.2 V (2.5 V) while maintaining CMRR ≥50 dB. This allows direct interface with ground-referenced sensors and rail-splitting networks, and accommodates signals spanning nearly the full supply range - essential for single-supply signal conditioning in portable equipment.

Can the LMV344MAX operate from a 1.8 V supply?

No, the LMV344MAX is not specified or guaranteed for operation below 2.7 V. Absolute maximum ratings and recommended operating conditions in the SNOS990H datasheet define 2.7 V as the minimum supply voltage. Attempting 1.8 V operation may result in degraded gain, increased offset, loss of rail-to-rail output capability, or complete functional failure - no characterization data exists for sub-2.7 V use.

Is the LMV344MAX pin-compatible with other quad op-amps in TSSOP-14 packages?

The LMV344MAX uses a standard TSSOP-14 pinout defined in TI's SNOS990H datasheet (Pin 1 = OUT A, Pin 2 = IN A−, Pin 3 = IN A+, etc.). While the physical package is industry-standard, electrical pin functions differ from many other quad op-amps (e.g., LM324, TLV2464), which use alternate pin mappings. Direct replacement requires verification of both pin assignment and electrical compatibility - no drop-in substitution is assured.