Texas Instruments LM61495Q3RPHRQ1

Overview

LM61495Q3RPHRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter delivering up to 10 A output current, with fixed 3.3 V output, 3 V–36 V input range, and pin-selectable switching frequency (400 kHz / 2.2 MHz or 200 kHz–2.2 MHz). It integrates high-side/low-side MOSFETs (R_DS(on) = 21 mΩ / 13 mΩ), internal compensation, soft-start, and RESET with filtered delayed release-designed for infotainment power rails.

For engineers reviewing the LM61495Q3RPHRQ1 datasheet, LM61495Q3RPHRQ1 pinout, LM61495Q3RPHRQ1 application, or LM61495Q3RPHRQ1 equivalent, key selection considerations include its wettable-flank 4.5 mm × 3.5 mm VQFN-HR (RPH) package, dual-side cooling compatibility, CISPR 25 Class 5 EMI compliance, functional safety documentation support, and 5 µA quiescent current in auto mode.

Technical Context

The LM61495Q3RPHRQ1 implements a synchronous buck topology with integrated 10 A-rated power stage, adjustable SW node rise time via R_BOOT, and pin-configurable spread spectrum (±4% typical Δf) using DRSS modulation. Its dual-mode operation (FPWM/PFM) enables seamless transition between constant-frequency PWM at full load and ultra-low-quiescent PFM at light loads.

Thermal design leverages a low-thermal-resistance 16-pin VQFN-HR package (θ_JA = 21.6°C/W on EVM), dual VIN/PGND paths for current sharing, and thermal shutdown at 158°C–180°C with 150°C–159°C hysteresis. The device supports external synchronization and includes a dedicated BIAS pin for improved efficiency when powered from ≥3.3 V output.

Key Specifications

Pinout & Package

LM61495Q3RPHRQ1 uses a 4.5 mm × 3.5 mm, 16-pin VQFN-HR (RPH) package with wettable flanks for automated optical inspection and enhanced thermal performance via dual-side cooling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480Q3RPHRQ1 and LM62460Q3RPHRQ1, the LM61495Q3RPHRQ1 provides higher current headroom (10 A), tighter output accuracy (±1.5%), and superior thermal performance (lower R_DS(on))-making it optimal for thermally constrained, high-reliability automotive modules.

Availability

LM61495Q3RPHRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and ADAS camera module designs requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for LM61495Q3RPHRQ1 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-grade power management solutions.

The LM6x4xx-Q1 product line delivers high-density, low-EMI buck converters optimized for automotive power systems-including infotainment, ADAS, and digital cockpit applications-where reliability, thermal performance, and regulatory compliance are critical.

FAQ

What is the output voltage tolerance of the LM61495Q3RPHRQ1 under full load and temperature?

The LM61495Q3RPHRQ1 delivers a fixed 3.3 V output with ±1.5% accuracy over full load (0–10 A) and temperature (–40°C to +125°C) in PWM mode. This specification ensures stable operation for sensitive digital loads such as automotive SoCs and FPGAs without requiring external trimming or feedback adjustment. The LM61495Q3RPHRQ1 maintains this accuracy even during input transients up to 42 V.

Does the LM61495Q3RPHRQ1 support external synchronization, and what are the timing requirements?

Yes, the LM61495Q3RPHRQ1 supports external clock synchronization via the SYNC/MODE pin. A valid sync signal must meet minimum pulse widths of 100 ns high and 100 ns low, with lock time of 4.3 ms when RT = 39.2 kΩ. The device operates in FPWM mode during sync and maintains frequency stability within ±0.5% of the external clock. This capability enables deterministic EMI reduction in multi-rail automotive systems. The LM61495Q3RPHRQ1 also allows RT pin tuning to align internal oscillator frequency closely with the sync source.

How does the RESET function of the LM61495Q3RPHRQ1 behave during startup and fault conditions?

The LM61495Q3RPHRQ1's open-drain RESET output asserts low for 2.1 ms after FB voltage reaches 94% of target (3.3 V), then releases high to indicate valid regulation. During faults-including EN deactivation, thermal shutdown, or output undervoltage-the RESET pin pulls low within 45 µs (deglitched) and remains low until conditions recover. It sinks ≤0.4 V at 1 mA and supports external pull-up to 5 V or 3.3 V. This behavior eliminates need for discrete reset supervisors in LM61495Q3RPHRQ1-based designs.

What thermal performance can be expected from the LM61495Q3RPHRQ1 in a standard 4-layer PCB layout?

On the LM61495RPHEVM (4-layer JEDEC board), the LM61495Q3RPHRQ1 achieves θ_JA = 21.6°C/W. With proper thermal vias under the exposed pad and 2 oz copper on inner layers, it sustains 10 A continuous output at +85°C ambient without derating. Junction temperature rises ~216°C per watt; at 92.6% efficiency (5 A @ 5 V out), power dissipation is ~0.4 W, resulting in ~9°C rise above ambient. The LM61495Q3RPHRQ1 thermal shutdown activates at 158°C–180°C with 9°C–11°C hysteresis.

Can the LM61495Q3RPHRQ1 operate with input voltage below 3.7 V, and what are the limitations?

The LM61495Q3RPHRQ1 requires ≥3.7 V at VIN to initiate startup, but once running, it sustains regulation down to 3.0 V input-critical for automotive cold-crank scenarios. At 3.3 V output, full 10 A capability requires ≥3.95 V input to maintain regulation and switching frequency ≥1.85 MHz. Below that, frequency foldback occurs, reducing f_SW to maintain duty cycle. The LM61495Q3RPHRQ1 continues operation with reduced current limit and efficiency but retains RESET assertion and protection functions throughout.