Texas Instruments LMR38010FSDDAR

Overview

LMR38010FSDDAR from Texas Instruments is a 4.2-V to 80-V, 1-A synchronous buck DC/DC converter with 40-µA quiescent current, FPWM operation mode, and integrated spread spectrum for EMI reduction-designed for industrial power rails in MHEV/EV systems, factory automation, and wireless infrastructure.

For engineers reviewing the LMR38010FSDDAR datasheet, LMR38010FSDDAR pinout, LMR38010FSDDAR application, or LMR38010FSDDAR equivalent, key selection criteria include input voltage range (4.2–80 V), FPWM + spread spectrum capability, precision enable threshold (1.1–1.4 V), thermal shutdown at 163°C, and HSOIC-8 PowerPAD™ package compatibility with high-voltage spacing (>1.5 mm VIN–GND).

Technical Context

The LMR38010FSDDAR implements fixed-frequency peak-current mode control with internal compensation, enabling stable regulation across 1-V to 75-V adjustable output using a resistor divider on the FB pin. It supports both resistor-programmed (200 kHz–2.2 MHz) and external clock synchronization (300 kHz–2.1 MHz) modes.

Its FPWM operation ensures constant switching frequency and low output ripple under light load, while integrated synchronous rectification (R_DS(on)-HS = 303 mΩ, R_DS(on)-LS = 133 mΩ) eliminates external diode losses. Protection includes cycle-by-cycle current limiting, hiccup-mode short-circuit response, and thermal shutdown with 13°C hysteresis (163°C trip / 150°C recovery).

Key Specifications

Pinout & Package

LMR38010FSDDAR is housed in an 8-pin HSOIC (DDA) package with exposed thermal pad (EP), measuring 4.89 mm × 3.90 mm. The PowerPAD™ enhances thermal performance and requires soldering to PCB ground plane for optimal junction-to-board conduction (R_θJB = 13.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR38010FDDAR and LMR36510SDDAR, the LMR38010FSDDAR uniquely combines 80-V input tolerance, FPWM stability, and integrated spread spectrum-making it the only option among the three qualified for high-EMI automotive and wireless infrastructure applications requiring simultaneous wide input range and regulatory compliance.

Availability

LMR38010FSDDAR is available at Aetrix Electronics and suitable for industrial transport, wireless infrastructure, factory automation, and MHEV auxiliary power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LMR38010FSDDAR 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 power management ICs for industrial, automotive, and communications markets.

The LMR38010FSDDAR belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC converters-designed specifically for rugged industrial and transportation applications demanding wide input range, low IQ, and integrated EMI mitigation without complex external circuitry.

FAQ

What is the maximum input voltage rating for the LMR38010FSDDAR?

The LMR38010FSDDAR has an absolute maximum input voltage rating of 85 V, with recommended continuous operation up to 80 V. This allows safe deployment in 48-V, 60-V, and 72-V industrial and mild hybrid electric vehicle systems, including transient conditions like load dump per ISO 7637-2. Operation beyond 80 V is limited to short-duration transients only.

Does the LMR38010FSDDAR support pre-biased output start-up?

Yes, the LMR38010FSDDAR supports pre-biased output start-up, meaning it can safely begin regulation even when the output capacitor is already charged to a non-zero voltage. This feature is essential in hot-swap, redundant power, and multi-rail sequencing applications where output voltage may be present before the converter is enabled.

How does the spread spectrum function operate in the LMR38010FSDDAR?

The LMR38010FSDDAR implements pseudorandom spread spectrum modulation with ±4% frequency deviation around the programmed center frequency. This dithers the fundamental switching energy across a narrow band, reducing peak EMI amplitudes by up to 10 dB-enabling compliance with stringent conducted emissions standards (e.g., EN 55032 Class A) without additional filtering components.

What is the thermal performance of the LMR38010FSDDAR in its HSOIC-8 PowerPAD™ package?

In the 8-pin HSOIC PowerPAD™ package, the LMR38010FSDDAR achieves a junction-to-ambient thermal resistance (R_θJA) of 42.9°C/W on a standard 2-layer board, and 29°C/W on a TI evaluation board with optimized copper pour. Its junction-to-board (R_θJB) is 13.6°C/W-confirming effective heat transfer when the EP pad is soldered to a solid ground plane.

Can the LMR38010FSDDAR be synchronized to an external clock source?

Yes, the LMR38010FSDDAR supports external clock synchronization via the RT/SYNC pin across a 300-kHz to 2.1-MHz range. When driven with a clean square wave (≥2.0 V high, ≤0.6 V low, ≥50 ns pulse width), the internal PLL locks to the external signal, enabling deterministic timing alignment with other system clocks or noise-sensitive bands.