Texas Instruments LM61495Q4RPHRQ1

Overview

LM61495Q4RPHRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter delivering up to 10 A output current with fixed 4.0 V output, 3 V–36 V input range, and 2.2 MHz switching frequency. It integrates high-side/low-side MOSFETs (R_DS(on) = 21 mΩ / 13 mΩ), internal compensation, thermal shutdown, and a precision open-drain RESET output-designed for ADAS power rails requiring low EMI and high power density.

For engineers reviewing the LM61495Q4RPHRQ1 datasheet, LM61495Q4RPHRQ1 pinout, LM61495Q4RPHRQ1 application, or LM61495Q4RPHRQ1 equivalent, key selection criteria include its 4.0 V fixed output accuracy (±1%), 5 µA quiescent current in auto mode, CISPR 25 Class 5 compliance, pin-configurable spread spectrum, and wettable-flank 4.5 mm × 3.5 mm VQFN-HR package optimized for dual-side cooling.

Technical Context

The LM61495Q4RPHRQ1 implements a synchronous buck topology with integrated 10 A-rated power stage, adjustable SW node rise time via R_BOOT, and dual-random spread spectrum (DRSS) modulation (±4% frequency hop) to suppress peak emissions. Its control loop uses internal Type II compensation and supports FPWM, PFM, or external synchronization via SYNC/MODE pin.

It features a dedicated BIAS pin for efficiency optimization at high output voltages, a precision enable input with 1.26 V threshold and 0.5 V hysteresis, and a RESET output with 112% OV/94% UV thresholds referenced to FB voltage and 2.1 ms active delay-enabling system-level power sequencing without external supervisors.

Key Specifications

Pinout & Package

VQFN-HR (RPH) package: 16-pin, 4.5 mm × 3.5 mm, wettable flank, exposed thermal pad (PGND-connected). Designed for dual-side cooling and high-reliability automotive assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480Q4RPHRQ1 and LM62460Q4RPHRQ1, the LM61495Q4RPHRQ1 provides 25% higher output current and lower R_DS(on), enabling single-chip 10 A solutions in ADAS and premium infotainment-without PCB redesign or thermal derating penalties.

Availability

LM61495Q4RPHRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and ADAS applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for LM61495Q4RPHRQ1 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 ICs with over 40 years of automotive qualification experience.

The LM6x4xx-Q1 product line was developed specifically for high-density, low-EMI automotive DC/DC conversion-targeting ADAS, infotainment, and body electronics where thermal performance, functional safety readiness, and CISPR compliance are mandatory.

FAQ

What is the output voltage tolerance of the LM61495Q4RPHRQ1 over temperature and line/load conditions?

The LM61495Q4RPHRQ1 delivers 4.0 V output with ±1% initial accuracy at 25°C. Over –40°C to +125°C junction temperature, ±1.5% line/load regulation is maintained for 1 A to full 10 A load, per datasheet Section 6.8. This stability is achieved via internal 2.1 MΩ feedback divider and precision 1.0 V reference, eliminating external resistor drift errors. The LM61495Q4RPHRQ1 does not require external trimming for automotive-grade accuracy.

How does the LM61495Q4RPHRQ1 achieve CISPR 25 Class 5 compliance?

The LM61495Q4RPHRQ1 achieves CISPR 25 Class 5 compliance through three integrated techniques: (1) symmetrical pinout minimizing loop area, (2) pin-configurable spread spectrum (DRSS) with ±4% frequency hopping, and (3) adjustable SW node rise time via R_BOOT. These features collectively suppress peak emissions by >10 dBµV/m on the LM61495RPHEVM. No external filters or shielding are needed when following TI's recommended layout guidelines for the LM61495Q4RPHRQ1.

Can the LM61495Q4RPHRQ1 operate with input voltage below 3.7 V?

Yes-the LM61495Q4RPHRQ1 starts up at 3.7 V but operates continuously down to 3.0 V once running. Below 3.7 V, the device enters dropout mode with reduced duty cycle; regulation is maintained until V_IN − V_OUT < 0.45 V (typical). This enables reliable operation during automotive cold-crank events. The LM61495Q4RPHRQ1's 42 V transient tolerance also protects against load-dump spikes up to 100 ms duration.

What is the purpose of the BIAS pin on the LM61495Q4RPHRQ1, and how should it be connected?

The BIAS pin on the LM61495Q4RPHRQ1 supplies the internal LDO that powers control circuitry. For 4.0 V output, connect BIAS to the regulated 4.0 V rail (or 3.3–12 V external source) with a 0.1 µF capacitor to AGND. This reduces power dissipation versus using V_IN, improving full-load efficiency by up to 1.2%. If output exceeds 12 V and no external bias is available, tie BIAS to AGND. The LM61495Q4RPHRQ1 requires this connection for specified performance.

Does the LM61495Q4RPHRQ1 support external clock synchronization, and what are the requirements?

Yes-the LM61495Q4RPHRQ1 supports external clock synchronization via the SYNC/MODE pin. Apply a CMOS-compatible clock (200–2200 kHz) with ≥100 ns pulse width; the device locks within 4.3 ms (RT = 39.2 kΩ). To minimize jitter, set the internal RT resistor to match the external frequency within ±10%. Synchronization is only active in FPWM mode; the LM61495Q4RPHRQ1 ignores external clocks in Auto or PFM modes.