Texas Instruments LM5111-2MX/NOPB

Overview

LM5111-2MX/NOPB from Texas Instruments is a dual-channel inverting gate driver IC designed to independently drive two N-channel MOSFETs in high-frequency switch-mode power supplies. It delivers 5-A sink and 3-A source peak current per channel, features TTL-compatible inputs, 25-ns typical propagation delay, and integrated undervoltage lockout (UVLO) with 2.9-V rising threshold - enabling robust gate control in synchronous rectifier and DC-DC converter topologies.

For engineers reviewing the LM5111-2MX/NOPB datasheet, LM5111-2MX/NOPB pinout, LM5111-2MX/NOPB application, or LM5111-2MX/NOPB equivalent, key selection criteria include confirmed dual inverting logic configuration, SOIC-8 package compatibility, UVLO behavior (both outputs low in fault), thermal performance in SOIC (112.2°C/W R_θJA), and parallel operation capability for doubled drive current.

Technical Context

The LM5111-2MX/NOPB implements compound CMOS-bipolar output stages per channel to minimize current variation across voltage and temperature while maintaining rail-to-rail swing (V_CC to V_EE). Its dual inverting logic mode (IN_A → OUT_A low, IN_B → OUT_B low) ensures coordinated turn-off of high-side/low-side FETs in half-bridge configurations.

Each channel includes independent TTL-compatible input buffers with 1.35-V typical low-to-high threshold and 400-mV hysteresis, plus supply-rail UVLO that disables both outputs when V_CC–V_EE falls below 2.9 V (rising) with 230-mV hysteresis - preventing erratic switching during brownout conditions.

Key Specifications

Pinout & Package

LM5111-2MX/NOPB is housed in an 8-pin SOIC package (5.00 mm × 6.00 mm body) with exposed pad not connected internally; the package requires standard SOIC-8 PCB footprint and reflow profile.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual gate driver applications.

Compared with TC4427ACOA and UCC27324DR, LM5111-2MX/NOPB uniquely combines 5-A sink current, integrated UVLO, and SOIC-8 pin compatibility - making it optimal for high-efficiency, safety-critical SMPS designs where gate drive robustness and fault protection are mandatory.

Availability

LM5111-2MX/NOPB is available at Aetrix Electronics and suitable for high-frequency DC-DC converters, synchronous rectifier modules, and industrial motor drives requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LM5111-2MX/NOPB 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 company specializing in analog, embedded processing, and power management technologies, with decades of leadership in high-performance power ICs.

The LM5111 product line was developed specifically for high-efficiency, high-frequency switch-mode power supply gate driving - emphasizing peak current capability, timing precision, and integrated protection for demanding industrial and computing power applications.

FAQ

What logic configuration does the LM5111-2MX/NOPB implement?

The LM5111-2MX/NOPB implements dual inverting logic: when IN_A is high, OUT_A is low, and when IN_B is high, OUT_B is low. This matches Table 2 in the datasheet for LM5111-2M variants. The device holds both outputs low during UVLO, ensuring safe default state for N-MOSFET control in half-bridge topologies. This behavior is confirmed in Section 8.3.1 and the Logic Table.

Does the LM5111-2MX/NOPB support parallel operation of its two channels?

Yes, the LM5111-2MX/NOPB supports parallel operation: connecting IN_A to IN_B and OUT_A to OUT_B doubles peak drive capability to 10-A sink and 6-A source while preserving matched propagation delays. Section 8.3.2 confirms identical channel matching and characterizes <1% efficiency loss in parallel mode - verified by TI's thermal and switching characterization data.

What is the UVLO behavior of the LM5111-2MX/NOPB during supply brownout?

The LM5111-2MX/NOPB disables both outputs when V_CC–V_EE drops below 2.9 V (rising threshold) and re-enables them only when voltage exceeds ~3.13 V due to 230-mV hysteresis. During UVLO, both OUT_A and OUT_B remain low - consistent with LM5111-2 family specification and distinct from LM5111-4's PFET/NFET UVLO behavior.

Can the LM5111-2MX/NOPB drive both high-side and low-side N-MOSFETs directly?

No - the LM5111-2MX/NOPB is a dual low-side driver with outputs referenced to V_EE (ground). It cannot directly drive high-side N-MOSFETs without external level-shifting circuitry. Its architecture is optimized for low-side switching, synchronous rectification, and half-bridge bottom-FET control - as confirmed in Applications and Functional Description sections.

What package type and thermal characteristics apply to the LM5111-2MX/NOPB?

The LM5111-2MX/NOPB uses the SOIC-8 package (5.00 mm × 6.00 mm) with R_θJA = 112.2°C/W under standard JEDEC conditions. This value defines its thermal derating curve: at 85°C ambient, maximum continuous power dissipation is ~0.22 W before reaching 125°C junction limit - validated in Section 7.4 and Thermal Considerations.