Texas Instruments LMV344MA

Overview

LMV344MA 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 functions in space-constrained handheld electronics.

For engineers reviewing the LMV344MA datasheet, LMV344MA pinout, LMV344MA application, or LMV344MA equivalent, key selection criteria include its quad-channel configuration, TSSOP-14 package footprint, rail-to-rail output swing (within 26 mV of rails at 2.7 V), ultra-low input bias current, and industrial-plus temperature range (−40°C to +125°C).

Technical Context

The LMV344MA implements a patented Class AB turnaround stage that reduces input-referred voltage noise (29 nV/√Hz at 10 kHz), offset voltage drift (1.7 µV/°C), and quiescent current while maintaining high open-loop gain and stable phase margin (72° at 100 kΩ load). Its PMOS input stage enables ultra-low input bias current without sacrificing AC performance.

It supports single-supply operation with rail-to-rail output swing and wide common-mode input range (down to −0.2 V below V− and up to 1.7 V below V+ at 2.7 V supply). Shutdown functionality is not available on the LMV344MA - unlike the LMV341-N - as it lacks a dedicated SHDN pin and is designed for always-on multi-channel signal conditioning.

Key Specifications

Pinout & Package

LMV344MA is housed in a 14-pin TSSOP package (5.00 mm × 4.40 mm body size), optimized for high-density PCB layouts in portable electronics. Pin assignments follow industry-standard quad op-amp topology with independent inputs and outputs per channel.

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 LMV344MA uniquely balances ultra-low input bias current, rail-to-rail output, sub-100-µA power, and guaranteed 2.7-V operation - making it optimal for battery-constrained, high-impedance, multi-channel analog systems.

Availability

LMV344MA is available at Aetrix Electronics and suitable for battery monitoring, portable audio line driving, multi-sensor signal conditioning, and PCMCIA interface buffering requiring stable component supply across industrial and consumer production cycles.

Supply support for LMV344MA 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 specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and low-power signal chains.

The LMV34x-N product line was engineered specifically for ultra-low-power, rail-to-rail output operation in space-constrained portable electronics - emphasizing minimal supply current, high input impedance, and robust performance across extended temperature ranges.

FAQ

Does the LMV344MA include a shutdown feature?

No, the LMV344MA does not incorporate a shutdown pin or function. Unlike the LMV341-N (single-channel variant), the LMV344MA is a quad op-amp without enable/disable control. All four amplifiers operate continuously when powered. For power-gated applications, external FET switching of V+ or use of the LMV341-N per channel is required. The LMV344MA's 100 µA per amplifier supply current remains fixed across operating conditions.

What is the maximum capacitive load the LMV344MA can drive stably?

The LMV344MA maintains stability with capacitive loads up to 100 pF when configured as a unity-gain buffer with RL ≥ 10 kΩ. For loads exceeding 100 pF - such as long cables or ADC input capacitance - an isolation resistor (≥200 Ω) must be placed between the LMV344MA output and the load. Data sheet Figure 26 confirms stable operation up to 100 pF; beyond that, phase margin degrades below 45°, risking oscillation.

Can the LMV344MA operate from a 2.5-V supply?

No, the LMV344MA is not specified or guaranteed for operation below 2.7 V. Absolute minimum supply voltage is 2.7 V per the Recommended Operating Conditions table (Section 6.3). At 2.5 V, parameters including output swing, CMRR, and GBW degrade outside datasheet limits - particularly output swing, which may collapse to <80% of rail. Designs requiring <2.7 V must select alternatives like the TLV9004 or OPA333 family.

Is the LMV344MA pin-compatible with the LMV324?

No, the LMV344MA is not pin-compatible with the LMV324. While both are quad op-amps in 14-pin packages, the LMV344MA uses TSSOP-14 (PW) and SOIC-14 (D) footprints with V− on Pin 11 and V+ on Pin 4. The LMV324 places V+ on Pin 4 but V− on Pin 11 only in SOIC-14; its TSSOP-14 variant (LMV324IPWR) swaps V− to Pin 3. Direct substitution risks incorrect supply polarity and device damage.

What is the typical input offset voltage drift over temperature for LMV344MA?

The LMV344MA exhibits a typical input offset voltage drift of 1.7 µV/°C across −40°C to +125°C, as specified in Section 6.5 (Electrical Characteristics – 2.7 V DC). This low drift - combined with a 0.55-mV typical VOS at 25°C - ensures predictable calibration stability in systems exposed to ambient thermal cycling, such as handheld medical devices or outdoor environmental sensors. Drift remains linear and monotonic across the full range.