Texas Instruments LMR14030SSQDDARQ1

Overview

LMR14030SSQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade synchronous step-down DC-DC converter with integrated 90 mΩ high-side MOSFET, 4 V to 40 V input range, 3.5 A continuous output current, 40 µA quiescent current in sleep mode, and spread-spectrum EMI reduction. It targets battery regulation in ADAS camera modules and infotainment head units.

For engineers reviewing the LMR14030SSQDDARQ1 datasheet, LMR14030SSQDDARQ1 pinout, LMR14030SSQDDARQ1 application, or LMR14030SSQDDARQ1 equivalent, key selection considerations include its 75 ns minimum on-time for high VIN/VOUT ratios, RT/SYNC dual-mode frequency control (200 kHz–2.5 MHz), precision enable threshold (1.2 V), internal loop compensation, and thermal shutdown at 170°C.

Technical Context

The LMR14030SSQDDARQ1 implements fixed-frequency peak current mode control with slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its Sleep-mode reduces switching losses at light load by clamping COMP voltage at 400 mV and drawing only 40 µA IQ.

It supports high-duty-cycle operation up to ~97% via bootstrap capacitor recharge circuitry and integrates protection including cycle-by-cycle current limit, output overvoltage protection (OVP), input undervoltage lockout (UVLO) with 285 mV hysteresis, and thermal shutdown with 12°C hysteresis.

Key Specifications

Pinout & Package

LMR14030SSQDDARQ1 uses the 8-pin HSOIC (DDA) package with exposed thermal pad (4.9 mm × 6 mm), optimized for automotive thermal reliability and manufacturability. The PowerPAD™ enhances heat transfer to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR14030QDPRRQ1, the LMR14030SSQDDARQ1 trades PGOOD functionality and smaller WSON footprint for spread-spectrum EMI reduction and HSOIC manufacturability; versus LMR34030QRGRRQ1, it offers superior EMI control at the cost of slightly higher IQ and larger package.

Availability

LMR14030SSQDDARQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, and body control modules requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LMR14030SSQDDARQ1 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 ICs, with deep expertise in automotive-grade reliability and functional safety.

The LMR14030SSQDDARQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, designed specifically for robust, low-EMI DC-DC regulation in safety-critical vehicle subsystems operating from 4 V to 40 V inputs.

FAQ

What is the purpose of the SS pin on the LMR14030SSQDDARQ1?

The SS (soft-start) pin on the LMR14030SSQDDARQ1 controls output voltage ramp-up time via an external capacitor. An internal 3 µA current source charges the capacitor, generating a linear voltage ramp that modulates the feedback reference to prevent inrush current. This protects both the LMR14030SSQDDARQ1 and downstream loads during power-up, especially critical in systems with large output capacitance like infotainment displays.

Does the LMR14030SSQDDARQ1 support synchronization to an external clock?

Yes, the LMR14030SSQDDARQ1 supports synchronization via its RT/SYNC pin. When driven with a square wave between 250 kHz and 2.3 MHz (with ≥30 ns pulse width, high ≥1.7 V, low ≤0.5 V), the internal PLL locks to the external clock edge. This enables deterministic EMI suppression in multi-converter systems and eliminates beat frequencies-key for automotive radar and camera modules sharing a common timing reference.

How does the spread-spectrum feature work in the LMR14030SSQDDARQ1?

The LMR14030SSQDDARQ1 implements spread-spectrum modulation by dithering the switching frequency ±6% around the center value set by the RT resistor or SYNC clock. This spreads radiated energy across a wider bandwidth, reducing peak EMI amplitude by up to 10 dB. It is enabled by default in the SS variant and requires no external components-making it ideal for meeting stringent CISPR 25 Class 5 limits in automotive EMC testing.

What is the maximum duty cycle supported by the LMR14030SSQDDARQ1?

The LMR14030SSQDDARQ1 supports up to approximately 97% duty cycle, enabled by its bootstrap capacitor recharge circuit. When the high-side MOSFET remains on for multiple cycles (5–6 at <1 MHz, 10–11 at >1 MHz) and BOOT-to-SW voltage drops below 3.2 V, the device temporarily turns off the high-side switch and pulls SW low to refresh the BOOT capacitor. This allows operation with very small VIN–VOUT differentials, such as 5 V output from 5.2 V input.

Is the LMR14030SSQDDARQ1 qualified for automotive use?

Yes, the LMR14030SSQDDARQ1 is AEC-Q100 qualified for Grade 1 operation (–40°C to +125°C ambient), with HBM ESD level H1C (±2 kV) and CDM level C4A (±750 V). It meets automotive reliability standards for humidity, vibration, and thermal cycling, and includes built-in protections-thermal shutdown, output OVP, input UVLO, and cycle-by-cycle current limiting-making it suitable for safety-compliant vehicle subsystems.