Texas Instruments LMR36006AQRNXTQ1

Overview

LMR36006AQRNXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 0.6 A output current across a 4.2-V to 60-V input range, featuring 400-kHz fixed switching frequency, ±1.5% reference voltage tolerance, and integrated high-side/low-side MOSFETs in a 2-mm × 3-mm VQFN-HR package. It powers ADAS camera modules with low EMI, thermal shutdown, hiccup short-circuit protection, and precision enable control.

For engineers reviewing the LMR36006AQRNXTQ1 datasheet, LMR36006AQRNXTQ1 pinout, LMR36006AQRNXTQ1 application, or LMR36006AQRNXTQ1 equivalent, key selection considerations include its 400-kHz switching frequency variant, adjustable output configuration, HotRod™ package for CISPR25 Class 5 compliance, 26-µA quiescent current in PFM mode, and automotive-grade junction temperature range (–40°C to +150°C).

Technical Context

The LMR36006AQRNXTQ1 uses peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its auto-mode operation transitions between PWM at heavy loads and PFM with diode emulation at light loads to maintain >94% efficiency at 12-V_IN/5-V_OUT/0.6-A while minimizing quiescent current to 26 µA.

It integrates a precision power-good flag with 80–200-µs deglitch delay and dual-threshold enable logic (VEN-VOUT-H = 1.231 V typ., VEN-VOUT-HYS = 110 mV), supporting direct VIN connection or programmable UVLO. Protection includes cycle-by-cycle current limit (ISC = 1 A typ.), hiccup-mode short-circuit response (t_HC = 94 ms), and thermal shutdown at 170°C with 12°C hysteresis.

Key Specifications

Pinout & Package

VQFN-HR (12-pin) package with 2.00 mm × 3.00 mm body size and wettable flanks for enhanced solder joint reliability and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR36015AQRNXTQ1 and LMR33630AQDRRTQ1, the LMR36006AQRNXTQ1 offers optimal balance of ultra-small 2×3-mm footprint, 60-V input resilience, and 0.6-A capability-making it uniquely suited for space-constrained ADAS edge nodes where thermal density and EMI are critical.

Availability

LMR36006AQRNXTQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, body control modules, and automotive telematics units requiring stable component supply with AEC-Q100 qualification and long-term production continuity.

Supply support for LMR36006AQRNXTQ1 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 automotive ICs, with decades of experience in high-reliability power management solutions.

The LMR36006-Q1 belongs to TI's automotive-qualified buck converter product line, engineered specifically for demanding automotive environments-including ADAS, infotainment, and body electronics-where small size, low EMI, and functional safety readiness are essential.

FAQ

What is the maximum input voltage rating for the LMR36006AQRNXTQ1?

The LMR36006AQRNXTQ1 has an absolute maximum input voltage rating of 66 V, with recommended operating range from 4.2 V to 60 V. This allows robust operation during automotive load-dump events and cold-crank conditions. The device maintains regulation and protection functionality across this full range, and its internal MOSFETs are rated accordingly-no external TVS or clamping is required for standard 12-V or 24-V vehicle architectures.

Does the LMR36006AQRNXTQ1 support adjustable output voltage?

Yes, the LMR36006AQRNXTQ1 supports fully adjustable output voltage via an external resistor divider connected to the FB pin. Its internal 1-V reference enables precise regulation from ~1.2 V up to just below VIN. Unlike fixed-output variants (e.g., LMR36006FSC3RNXTQ1), this part does not include internal feedback resistors-giving designers flexibility to set custom voltages such as 1.8 V for memory rails or 2.5 V for ADC references in automotive ECUs.

How does the power-good (PG) flag behave during startup and fault conditions?

The LMR36006AQRNXTQ1 PG pin is an open-drain output that goes high after a ~4-ms delay following EN assertion, provided output voltage reaches 95% of target. It asserts low during undervoltage, overcurrent, thermal shutdown, or EN deactivation. With built-in 80–200-µs deglitch filtering, it ignores brief transients-ensuring reliable system reset signaling without false triggers during load steps or line dips. The PG signal remains valid down to 2 V input.

Is the LMR36006AQRNXTQ1 pin-compatible with other devices in the LMR360xx-Q1 family?

Yes, the LMR36006AQRNXTQ1 shares the same 12-pin VQFN-HR (RNX) package and pinout with LMR36015-Q1 and LMR36006B-Q1 variants. This enables hardware scalability-designers can upgrade output current (to 1.5 A) or change switching frequency (to 1 MHz or 2.1 MHz) without PCB layout changes. However, note that electrical characteristics (e.g., current limit, R_DS(on)) differ, so firmware and magnetics must be validated per variant.

What thermal performance can be expected from the LMR36006AQRNXTQ1 in a typical 2-layer PCB design?

In a standard 2-layer board with 1 oz copper and 200 mm² exposed thermal pad connected to inner ground plane, the LMR36006AQRNXTQ1 achieves ~72.5°C/W junction-to-ambient thermal resistance (R_θJA). At 0.6-A load and 24-V input, typical power dissipation is ~0.35 W, resulting in ~25°C temperature rise above ambient-well within its 150°C max junction rating. For higher ambient environments, adding thermal vias under the exposed pad reduces R_θJA by up to 20%.