Texas Instruments LMR36015AQRNXRQ1

Overview

LMR36015AQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 1.5 A output current across a 4.2-V to 60-V input range, featuring peak-current-mode control, 400-kHz fixed switching frequency, ±1.5% reference voltage tolerance, and integrated high-side/low-side MOSFETs with 225 mΩ / 150 mΩ R_DS(on). It powers ADAS camera modules requiring compact, low-EMI, functional-safety-capable regulation.

For engineers reviewing the LMR36015AQRNXRQ1 datasheet, LMR36015AQRNXRQ1 pinout, LMR36015AQRNXRQ1 application, or LMR36015AQRNXRQ1 equivalent, key selection criteria include its 2-mm × 3-mm VQFN-HR package with wettable flanks, 26 µA quiescent current in PFM mode, 93% efficiency at 12-V_IN/5-V_OUT/1-A, thermal shutdown at 170°C, and power-good flag with 80–200 µs deglitch delay.

Technical Context

The LMR36015AQRNXRQ1 uses peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its HotRod™ flip-chip packaging minimizes switch-node ringing and parasitic inductance via parallel input paths and optimized layout.

It operates in auto mode-transitioning between PWM (heavy load) and PFM with diode emulation (light load)-to maintain high efficiency across the full 0–1.5-A load range. The device integrates a precision enable input with hysteresis (110 mV), internal 5-V LDO (VCC), and open-drain power-good flag with built-in filtering and startup delay.

Key Specifications

Pinout & Package

The LMR36015AQRNXRQ1 is housed in a 12-pin VQFN-HR package (2.0 mm × 3.0 mm, 0.4-mm pitch) with wettable flanks for enhanced solderability and AOI capability. Thermal performance is optimized with R_θJA = 72.5°C/W and R_θJB = 23.3°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR36006AQRNXRQ1 and LMR33630AQDRARQ1, the LMR36015AQRNXRQ1 uniquely balances 1.5-A capability, 60-V input range, and minimal 2-mm × 3-mm footprint-making it optimal for space-constrained, high-input-voltage automotive subsystems where neither lower-current nor higher-current alternatives meet all three criteria simultaneously.

Availability

LMR36015AQRNXRQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, body control modules, and infotainment displays requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for LMR36015AQRNXRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive power management ICs and functional safety solutions.

The LMR36015AQRNXRQ1 belongs to TI's LMR360x5-Q1 family of automotive-grade synchronous buck converters, designed specifically for scalable, low-EMI, AEC-Q100-compliant power supplies in ADAS, body electronics, and infotainment systems.

FAQ

What is the maximum input voltage rating for the LMR36015AQRNXRQ1?

The LMR36015AQRNXRQ1 has an absolute maximum input voltage rating of 66 V, with recommended operation from 4.2 V to 60 V. This 60-V upper limit accommodates automotive load-dump transients per ISO 7637-2, while the 66-V absolute rating provides margin against short-duration spikes. Operation beyond 60 V is not recommended for sustained use, as thermal and reliability validation was performed within the 4.2–60-V range specified in the datasheet.

Does the LMR36015AQRNXRQ1 support adjustable output voltage?

Yes, the LMR36015AQRNXRQ1 supports fully adjustable output voltage via an external resistor divider on the FB pin, with a 1.0-V internal reference enabling V_OUT settings from 1 V to 58 V. It does not include a fixed 3.3-V option-those variants carry "FSC3" in the part number (e.g., LMR36015FSC3RNXRQ1). The LMR36015AQRNXRQ1's adjustable architecture allows flexible rail generation for diverse automotive subsystems without changing the base IC.

How does the power-good (PG) flag behave during startup and fault conditions for the LMR36015AQRNXRQ1?

The LMR36015AQRNXRQ1's PG flag asserts high after a ~4-ms delay following EN assertion, indicating stable regulation. It goes low during faults-including output undervoltage (FB < 93% of target), overvoltage (FB > 107%), thermal shutdown, or current-limit hiccup-and remains low until recovery. With EN low, PG stays valid down to 2-V input. The 80–200 µs deglitch filter prevents false triggering during transient load steps, ensuring reliable system reset signaling in the LMR36015AQRNXRQ1.

What thermal metrics apply to the LMR36015AQRNXRQ1 in its VQFN-HR package?

The LMR36015AQRNXRQ1 in the 12-pin VQFN-HR package has R_θJA = 72.5°C/W (junction-to-ambient, JEDEC high-K board), R_θJB = 23.3°C/W (junction-to-board), and R_θJC(top) = 35.9°C/W (junction-to-case top). These values assume standard 2-layer PCB layout with 2 oz copper and thermal vias under the exposed pad. The device enters thermal shutdown at 170°C and recovers at 158°C, providing 12°C hysteresis to prevent oscillation near trip point.

Is the LMR36015AQRNXRQ1 pin-compatible with other devices in the LMR360x5-Q1 family?

Yes, the LMR36015AQRNXRQ1 is pin-compatible with the LMR36006-Q1 (0.6-A) and LMR33620/30-Q1 (2-A/3-A) families in matching packages-enabling scalable power design across current requirements without PCB rework. However, pin compatibility does not imply identical electrical behavior: switching frequency, current limit, and thermal limits differ. Layout reuse is valid, but schematic review and thermal validation are required when substituting across current ratings.