Texas Instruments LMR14030SQDDAQ1

Overview

LMR14030SQDDAQ1 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 adjustable 200 kHz–2.5 MHz switching frequency. It serves as a primary power conditioning stage in battery-regulated automotive subsystems.

For engineers reviewing the LMR14030SQDDAQ1 datasheet, LMR14030SQDDAQ1 pinout, LMR14030SQDDAQ1 application, or LMR14030SQDDAQ1 equivalent, key selection considerations include its ultra-low IQ for always-on systems, spread-spectrum EMI reduction capability, precision enable threshold (1.2 V), internal loop compensation, and thermal shutdown at 170°C - all validated for –40°C to 125°C ambient operation.

Technical Context

The LMR14030SQDDAQ1 implements fixed-frequency peak current mode control with slope compensation to ensure stability at duty cycles >50%. Its Sleep-mode dynamically reduces switching activity below 300 mA peak inductor current, maintaining 40 µA IQ while regulating output voltage via internal error amplifier clamping.

It features a bootstrap gate-drive architecture enabling up to 97% effective duty cycle, with automatic BOOT capacitor recharge when BOOT–SW drops below 3.2 V. Frequency programming uses RT resistor (e.g., 11.5 kΩ for ~1.9 MHz), and synchronization accepts external clocks from 250 kHz to 2.3 MHz with 30 ns minimum pulse width and PLL lock-in time of 100 µs.

Key Specifications

Pinout & Package

LMR14030SQDDAQ1 is housed in an 8-pin HSOIC (DDA) package with exposed PowerPAD™ thermal pad (4.9 mm × 6 mm), optimized for automotive board space and 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 LMR14020SQDDAQ1 and LMR14050SQDDAQ1, the LMR14030SQDDAQ1 offers optimal balance of current capability, thermal performance, and quiescent power for mid-tier automotive modules - avoiding overdesign while ensuring margin for peak loads and temperature derating.

Availability

LMR14030SQDDAQ1 is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera power supplies, and telematics control units requiring stable component supply with AEC-Q100 compliance and long-term production support.

Supply support for LMR14030SQDDAQ1 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 decades of automotive qualification expertise.

The LMR14030SQDDAQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, designed specifically for robust, easy-to-use DC-DC regulation in harsh-temperature, high-reliability vehicle subsystems.

FAQ

What is the maximum input voltage rating for the LMR14030SQDDAQ1?

The LMR14030SQDDAQ1 has an absolute maximum input voltage rating of 44 V, with recommended operating range from 4 V to 40 V. This allows direct connection to 12 V and 24 V automotive batteries while surviving load-dump transients per ISO 7637-2. Operation above 40 V is not recommended for sustained use, as it exceeds the specified operating condition and may impact reliability or thermal performance.

Does the LMR14030SQDDAQ1 require external compensation components?

No, the LMR14030SQDDAQ1 features fully internal loop compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces bill-of-materials count, and improves consistency across production units. The internal compensation is optimized for stability with common output capacitor types (e.g., ceramic, polymer) and inductor values used in automotive applications.

What package type does the LMR14030SQDDAQ1 use, and how is thermal performance achieved?

The LMR14030SQDDAQ1 uses an 8-pin HSOIC package with PowerPAD™ (DDA), measuring 4.9 mm × 6 mm. Thermal performance is achieved through the exposed copper thermal pad, which must be soldered to a large PCB ground plane. With R_θJA = 43.2°C/W, it delivers 3.5 A continuously at 125°C ambient when properly laid out - verified in TI's reference design TIDA-01389.

Can the LMR14030SQDDAQ1 synchronize to an external clock, and what are the requirements?

Yes, the LMR14030SQDDAQ1 supports frequency synchronization via its RT/SYNC pin, accepting external clocks from 250 kHz to 2.3 MHz. Required signal levels are V_HIGH ≥ 1.7 V, V_LOW ≤ 0.5 V, and minimum pulse width ≥ 30 ns. The internal PLL achieves lock-in within 100 µs, enabling deterministic timing alignment across multiple converters in complex automotive ECUs.

How does the LMR14030SQDDAQ1 manage efficiency at light load?

The LMR14030SQDDAQ1 enters Sleep-mode at light loads (<300 mA peak inductor current), reducing switching activity and drawing only 40 µA quiescent current. In this mode, the internal COMP voltage is clamped at 400 mV, and the high-side MOSFET is inhibited until output droop triggers recovery. This preserves >85% efficiency down to 1 mA load (VIN=12 V, VOUT=5 V), critical for always-on automotive functions.