Texas Instruments LM22671QMRE-5.0/NOPB

Overview

LM22671QMRE-5.0/NOPB from Texas Instruments is a 42 V, 500 mA synchronous step-down DC/DC regulator with fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated 200 mΩ N-channel MOSFET. It operates across –40°C to +125°C junction temperature and supports industrial control, telecom power, and embedded systems requiring stable 5 V rail generation from 4.5–42 V inputs.

For engineers reviewing the LM22671QMRE-5.0/NOPB datasheet, LM22671QMRE-5.0/NOPB pinout, LM22671QMRE-5.0/NOPB application, or LM22671QMRE-5.0/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance in HSOP-8 PowerPAD™ package, soft-start adjustability via external capacitor, precision enable threshold (1.6 V typ), and compatibility with low-ESR ceramic output capacitors.

Technical Context

The LM22671QMRE-5.0/NOPB implements voltage-mode PWM control with input voltage feed-forward for loop gain stabilization, enabling optimized transient response without external compensation. Its internal type III compensation is tuned for fixed 5 V output operation and supports stable regulation with standard inductor–capacitor combinations.

It integrates a bootstrap gate driver with dedicated BOOT/SW pins, requires no external bootstrap diode, and enforces minimum on-time (100 ns) and off-time (100 ns) constraints to ensure boot-capacitor recharge and prevent sub-harmonic oscillation. The RT/SYNC pin enables frequency adjustment (200–1000 kHz) or synchronization to an external clock >500 kHz.

Key Specifications

Pinout & Package

LM22671QMRE-5.0/NOPB is housed in an HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (R_θJA = 60°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM22670MRE-5.0/NOPB, LM22671QMRE-5.0/NOPB offers 2 V higher input tolerance and 100 mA higher typical current capability-critical for robustness in 36 V industrial systems. Versus TPS54302DDAR, it trades higher current and flexibility for plug-and-play fixed-output operation with zero external compensation.

Availability

LM22671QMRE-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded vehicle telematics requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned qualification.

Supply support for LM22671QMRE-5.0/NOPB 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 technologies, with decades of expertise in high-reliability DC/DC conversion.

The LM22671 product line delivers SIMPLE SWITCHER® buck regulators targeting space-constrained, thermally demanding applications where ease of use, minimal external components, and robust operation across wide input ranges are essential.

FAQ

What is the maximum input voltage rating for LM22671QMRE-5.0/NOPB?

The LM22671QMRE-5.0/NOPB has an absolute maximum input voltage of 43 V and a recommended operating range of 4.5 V to 42 V. This makes it suitable for 24 V and 36 V industrial systems, including those subject to load-dump transients. Operation above 42 V risks permanent damage, and the device incorporates internal protection to prevent latch-up under overvoltage conditions. Always verify input transient suppression in final design.

Does LM22671QMRE-5.0/NOPB require an external feedback resistor network?

No, LM22671QMRE-5.0/NOPB does not require an external feedback resistor network. It is the fixed 5.0 V output variant, with internal feedback reference connected directly to the FB pin. Unlike the LM22671-ADJ version, no external resistors are needed-reducing component count, board area, and potential drift sources. The FB pin remains unconnected in standard operation.

Can LM22671QMRE-5.0/NOPB synchronize its switching frequency to an external clock?

Yes, LM22671QMRE-5.0/NOPB can synchronize its switching frequency using the RT/SYNC pin. When driven by an external clock signal between 500 kHz and 1 MHz with valid logic levels (V_SYNC thresholds: 1.75 V min high, <0.8 V low), the device locks to the rising edge. Synchronization eliminates beat frequencies in multi-rail systems and aids EMI compliance. Note that current-limit foldback is disabled during sync mode.

What thermal performance can be expected from LM22671QMRE-5.0/NOPB in HSOP-8 PowerPAD™ package?

LM22671QMRE-5.0/NOPB in HSOP-8 PowerPAD™ achieves a junction-to-ambient thermal resistance (R_θJA) of 60°C/W with standard 2-layer PCB layout and 1 in² copper pour under the exposed pad. With proper thermal vias to inner ground planes, R_θJA can improve to ~40°C/W. At 500 mA load and 12 V input, typical junction rise is ~30°C above ambient-well within the 125°C max rating. Thermal shutdown activates at 150°C.

Is LM22671QMRE-5.0/NOPB automotive-qualified?

LM22671QMRE-5.0/NOPB itself is not AEC-Q100 qualified; however, it belongs to the LM22671-Q1 family, which is AEC-Q100 Grade 1 qualified (–40°C to +125°C). The "QMRE" suffix indicates a commercial-grade part in the same HSOP-8 PowerPAD™ package and pinout. For automotive applications, LM22671Q1MRE-5.0/NOPB should be selected instead to meet qualification requirements.