Texas Instruments LMR14020SSQDDARQ1

Overview

LMR14020SSQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 40V input, 2A synchronous step-down DC/DC converter with integrated 90mΩ high-side MOSFET, 40µA quiescent current in sleep mode, adjustable 200kHz–2.5MHz switching frequency, and spread-spectrum EMI reduction - deployed in battery regulation and infotainment power rails.

For engineers reviewing the LMR14020SSQDDARQ1 datasheet, LMR14020SSQDDARQ1 pinout, LMR14020SSQDDARQ1 application, or LMR14020SSQDDARQ1 equivalent, key selection considerations include its HSOIC-8 package thermal performance (RθJA = 43.2°C/W), 75ns minimum on-time for high VIN/VOUT ratios, internal compensation eliminating loop design effort, and precision enable with adjustable UVLO for automotive power sequencing.

Technical Context

The LMR14020SSQDDARQ1 implements fixed-frequency peak current mode control with slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its sleep-mode operation reduces switching losses at light load by clamping COMP voltage at 400mV and drawing only 40µA IQ.

It supports both resistor-programmed timing (RT/SYNC pin) and external clock synchronization (250kHz–2.3MHz), with built-in spread-spectrum dithering (±6%) to reduce conducted EMI peaks. The BOOT-to-SW recharge circuit enables up to 97% effective duty cycle during dropout conditions.

Key Specifications

Pinout & Package

LMR14020SSQDDARQ1 is packaged in an 8-pin HSOIC (DDA) with exposed thermal pad, measuring 4.9mm × 6mm. The exposed pad must be soldered to a PCB ground plane for optimal thermal performance (RθJC(bot) = 7.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR14020SSQDDARQ1, the LMR14030SQDDARQ1 offers scalable current capacity in identical footprint, while the TPS54240QDDARQ1 trades EMI performance and ease-of-use for broader input range and lower unit cost - making the LMR14020SSQDDARQ1 optimal for EMI-constrained, space-limited automotive applications demanding minimal design overhead.

Availability

LMR14020SSQDDARQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, ADAS camera power supplies, and infotainment core rails requiring stable component supply with AEC-Q100 traceability and long-term production support.

Supply support for LMR14020SSQDDARQ1 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, designing and manufacturing analog ICs, embedded processors, and high-reliability power management solutions for automotive, industrial, and communications markets.

The LMR14020SSQDDARQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, engineered specifically for robust, low-EMI DC/DC conversion in safety-critical vehicle subsystems operating across extended temperature and voltage ranges.

FAQ

What is the maximum input voltage rating for the LMR14020SSQDDARQ1?

The LMR14020SSQDDARQ1 has an absolute maximum input voltage rating of 44V, with recommended operating range from 4V to 40V. This allows direct connection to 12V and 24V automotive battery systems, including transient conditions such as load dump (up to 44V per ISO 7637-2) without external clamping. Operation beyond 40V is not recommended for continuous use per datasheet specifications.

Does the LMR14020SSQDDARQ1 support fixed 5V output without external resistors?

Yes, the LMR14020SSQDDARQ1 variant with "Q5" suffix (e.g., LMR14020SSQ5DDARQ1) provides a factory-trimmed fixed 5V output. However, the LMR14020SSQDDARQ1 itself is the adjustable version - it requires an external resistor divider on the FB pin to set output voltage, with typical accuracy of ±1.2% over temperature using the internal 0.75V reference.

How does spread-spectrum operation reduce EMI in the LMR14020SSQDDARQ1?

The LMR14020SSQDDARQ1 implements frequency dithering of ±6% around the center switching frequency, spreading energy across a bandwidth instead of concentrating it at discrete harmonics. This lowers peak radiated emissions by up to 10dB, easing compliance with CISPR 25 Class 5 limits without adding ferrite beads or larger LC filters - a key advantage in dense automotive PCB layouts.

What thermal performance can be expected from the LMR14020SSQDDARQ1 in HSOIC-8 package?

In the DDA (HSOIC-8) package, the LMR14020SSQDDARQ1 has a junction-to-ambient thermal resistance (RθJA) of 43.2°C/W with standard 2oz copper and 2-in² exposed pad area. With proper PCB layout - including thermal vias under the exposed pad tied to internal ground planes - it sustains 2A continuous output at 125°C ambient without derating, verified per AEC-Q100 Grade 1 requirements.

Can the LMR14020SSQDDARQ1 synchronize to an external clock, and what are the timing requirements?

Yes, the RT/SYNC pin supports external clock synchronization from 250kHz to 2.3MHz. The clock must have high-level ≥1.7V, low-level ≤0.5V, and minimum pulse width ≥30ns. Internal PLL locks within 100µs. When the external clock stops, the device automatically reverts to resistor-programmed mode - ensuring fail-safe operation in noisy automotive environments.