Texas Instruments LMR14050SQDPRTQ1

Overview

LMR14050SQDPRTQ1 from Texas Instruments is an automotive-grade 40V input, 5A synchronous step-down DC-DC converter with integrated 90mΩ high-side MOSFET, 40µA quiescent current in sleep mode, and adjustable 200kHz–2.5MHz switching frequency - designed for battery regulation in start-stop vehicle systems.

For engineers reviewing the LMR14050SQDPRTQ1 datasheet, LMR14050SQDPRTQ1 pinout, LMR14050SQDPRTQ1 application, or LMR14050SQDPRTQ1 equivalent, key selection considerations include AEC-Q100 Grade 1 qualification (–40°C to 125°C), ultra-low IQ for always-on modules, spread-spectrum EMI reduction, internal compensation, and precision enable with adjustable UVLO.

Technical Context

The LMR14050SQDPRTQ1 implements fixed-frequency peak current mode control with slope compensation to ensure stability at duty cycles >50%. It features a dedicated BOOT pin driving the high-side MOSFET gate via a 0.1µF capacitor and supports low-dropout operation up to ~97% duty cycle using automatic BOOT refresh.

Its RT/SYNC pin operates in dual-mode: as a resistor-programmed oscillator (200kHz–2.5MHz) or as a high-impedance PLL synchronization input (250kHz–2.3MHz), with automatic mode switching based on voltage threshold crossing. Internal loop compensation eliminates external compensation components.

Key Specifications

Pinout & Package

LMR14050SQDPRTQ1 is packaged in an 8-pin HSOIC (DDA) with PowerPAD™ thermal pad, measuring 4.9mm × 6mm. The exposed thermal pad must be soldered to a PCB ground plane for optimal thermal performance (R_θJA = 43.2°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with LMR14050SQDPRTQ1, the LMR14030QDPRRQ1 offers higher thermal efficiency in smaller footprint but reduced current capability, while the TPS54560QDGQRQ1 trades IQ and EMI features for wider input range and design flexibility - making each suitable for distinct subsystem constraints.

Availability

LMR14050SQDPRTQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and telecom/datacom systems requiring stable component supply with AEC-Q100 qualification and long-term production support.

Supply support for LMR14050SQDPRTQ1 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad automotive, industrial, and communications product portfolios.

The LMR14050SQDPRTQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, engineered specifically for robust, low-quiescent-current DC-DC regulation in harsh automotive environments - emphasizing reliability, thermal resilience, and EMI control.

FAQ

What is the maximum input voltage rating for the LMR14050SQDPRTQ1?

The LMR14050SQDPRTQ1 has an absolute maximum input voltage rating of 44V, with recommended operating input range from 4V to 40V. This 40V upper limit ensures compatibility with automotive battery systems under load-dump conditions per ISO 7637-2, while maintaining safe margin below the 44V absolute maximum to prevent damage during transients.

Does the LMR14050SQDPRTQ1 require external compensation components?

No, the LMR14050SQDPRTQ1 features fully internal loop compensation. This eliminates the need for external Type-II or Type-III compensation networks, reducing BOM count, PCB area, and design iteration time. The internal compensation is optimized for stability across all supported output capacitors, including ceramic and polymer types, without requiring user tuning.

How does the spread-spectrum feature reduce EMI in the LMR14050SQDPRTQ1?

The LMR14050SQDPRTQ1's spread-spectrum mode dithers the switching frequency by ±6% around the center value, distributing energy across a wider bandwidth and lowering peak radiated emissions. This reduces the need for large ferrite beads or metal shielding in sensitive automotive or telecom applications, helping meet CISPR 25 Class 5 and FCC Part 15 limits without major layout changes.

What package type is used for the LMR14050SQDPRTQ1, and how is thermal performance achieved?

The LMR14050SQDPRTQ1 uses an 8-pin HSOIC (DDA) package with PowerPAD™ thermal pad. Thermal performance relies on soldering the exposed pad directly to a multilayer PCB ground plane, achieving a junction-to-ambient thermal resistance (R_θJA) of 43.2°C/W. This design enables reliable 5A operation at +85°C ambient without forced airflow when proper copper area and vias are implemented.

Can the LMR14050SQDPRTQ1 synchronize to an external clock, and what are the valid frequency ranges?

Yes, the LMR14050SQDPRTQ1 supports external clock synchronization via its RT/SYNC pin. In SYNC mode, it accepts square-wave clocks from 250kHz to 2.3MHz, locking to the falling edge. Valid logic thresholds are V_{SYNC_HI} ≥ 1.7V and V_{SYNC_LO} ≤ 0.5V, with minimum pulse width of 30ns. This enables precise timing alignment with system clocks in radar or camera modules to avoid beat-frequency interference.