Texas Instruments LMR54410DBVR

Overview

LMR54410DBVR from Texas Instruments is a 4V–36V input, 1A synchronous buck DC-DC converter in SOT-23-6 package, featuring 1.1MHz fixed switching frequency, ±1% reference voltage accuracy, 60ns minimum on-time, and hiccup-mode short-circuit protection - deployed in industrial PLCs and smart meters for reliable wide-VIN power conditioning.

For engineers reviewing the LMR54410DBVR datasheet, LMR54410DBVR pinout, LMR54410DBVR application, or LMR54410DBVR equivalent, key selection considerations include PFM efficiency optimization at light load, thermal shutdown at 170°C, precision enable with 130mV hysteresis, and compatibility with 0.8V feedback reference for adjustable output regulation.

Technical Context

The LMR54410DBVR implements fixed-frequency peak-current mode control with internal compensation, enabling stable regulation using minimal external components. It integrates high-side (450mΩ) and low-side (240mΩ) MOSFETs, supports frequency foldback down to ~133kHz under dropout, and uses valley current sensing for hiccup-mode short-circuit protection.

Its PFM operation reduces quiescent current to 80–120µA at no load while maintaining monotonic start-up into prebiased outputs. The 0.8V feedback reference, ±1% tolerance, and precision enable (1.1–1.36V turn-on threshold) support accurate UVLO sequencing and tight output voltage regulation across –40°C to 150°C junction temperature.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90mm × 2.80mm footprint, thermally enhanced with exposed pad (not electrically connected), optimized for high-density industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck converter applications.

Compared with LMR54410FDBVR, the LMR54410DBVR trades constant-frequency operation for higher light-load efficiency; compared with TPS560430DBVR, it delivers 67% more current, superior thermal robustness (150°C TJ), and integrated hiccup protection - making it the sole choice for demanding industrial 1A applications.

Availability

LMR54410DBVR is available at Aetrix Electronics and suitable for industrial PLCs, smart meter auxiliary rails, DCS field interfaces, and sensor node power supplies requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LMR54410DBVR 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, embedded processing, and power management technologies, with decades of industrial-grade reliability validation.

The LMR544xx family is designed for rugged industrial DC-DC conversion - targeting wide-input, high-reliability applications like programmable logic controllers, energy metering, and factory automation where input transients, thermal stress, and long-term availability are critical.

FAQ

What is the maximum input voltage transient the LMR54410DBVR can survive?

The LMR54410DBVR withstands up to 50V input transients for ≤100μs at room temperature with ≤0.01% duty cycle, per Absolute Maximum Ratings. This exceeds IEC 61000-4-4 Level 4 surge immunity requirements for industrial equipment, eliminating need for external TVS diodes in many 24V system designs. The device remains fully functional after such events, and LMR54410DBVR's internal protection circuitry ensures no latch-up or parametric shift occurs.

Does the LMR54410DBVR require an external bootstrap capacitor?

Yes, the LMR54410DBVR requires a 100nF ceramic capacitor (X7R/X5R, ≥16V rating) between CB and SW pins to generate gate drive voltage for the internal high-side MOSFET. This capacitor is refreshed during low-side conduction and must be placed within 2mm of the CB/SW pins with low-inductance routing. Omitting or misplacing this capacitor causes immediate high-side FET failure - a design requirement explicitly validated in TI's LMR54410DBVR evaluation module layout guidelines.

Can the LMR54410DBVR operate with an output voltage below 0.8V?

No, the LMR54410DBVR cannot regulate below 0.8V because its internal reference voltage is fixed at 0.8V ±1%. The FB pin compares the resistor-divider output to this reference; setting VOUT < 0.8V would force the feedback voltage below the reference, causing the controller to drive maximum duty cycle without regulation. For sub-0.8V outputs, a different converter with adjustable reference or external error amplifier (e.g., TPS543x series) must be used - LMR54410DBVR's minimum regulated output is strictly 0.8V.

How does the LMR54410DBVR handle short-circuit conditions?

The LMR54410DBVR employs dual-stage protection: cycle-by-cycle current limiting during brief overloads, and hiccup-mode shutdown for sustained shorts. When FB voltage drops below 0.325V (40% of 0.8V reference) for 256 consecutive cycles, the device disables switching for 10ms, then attempts restart. This prevents thermal damage during faults while allowing automatic recovery - a behavior confirmed in LMR54410DBVR production test and documented in Section 6.7 System Characteristics of its datasheet.

Is the LMR54410DBVR pin-compatible with the LMR14010A?

Yes, the LMR54410DBVR is explicitly stated as pin-to-pin compatible with the LMR14010A in TI's official documentation. Both use SOT-23-6 (DBV) packaging with identical pin functions (CB, GND, FB, EN, VIN, SW) and mechanical dimensions (2.90mm × 2.80mm). However, LMR54410DBVR adds PFM mode, tighter reference tolerance (±1% vs. ±1.5%), and improved thermal shutdown (170°C vs. 165°C), making it a direct upgrade path without PCB changes.