Texas Instruments LM22675QMR-5.0/NOPB

Overview

LM22675QMR-5.0/NOPB from Texas Instruments is an automotive-grade, 42 V input, 1 A synchronous step-down DC/DC regulator with fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated boot-strap diode. It delivers high efficiency (>90%) in industrial control and telecom power rails requiring stable 5 V at up to 1 A.

For engineers reviewing the LM22675QMR-5.0/NOPB datasheet, LM22675QMR-5.0/NOPB pinout, LM22675QMR-5.0/NOPB application, or LM22675QMR-5.0/NOPB equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), internal voltage-mode compensation, precision enable threshold (1.6 V typ), and SO PowerPAD-8 package thermal performance.

Technical Context

The LM22675QMR-5.0/NOPB implements a voltage-mode PWM controller with input voltage feedforward for stable loop gain across 4.5–42 V input range. Its internal type III compensation is optimized for fixed 5 V output, eliminating external compensation components.

It integrates a 200 mΩ N-channel MOSFET switch, bootstrap gate driver with dedicated BOOT pin, and precision enable circuitry with 0.6 V hysteresis. Thermal shutdown activates at 150°C, and current limiting protects against overloads with foldback mode below ~1 V output during short-circuit conditions.

Key Specifications

Pinout & Package

LM22675QMR-5.0/NOPB uses the SO PowerPAD-8 (HSOP-8) package with exposed thermal pad (EP), measuring 4.89 mm × 3.90 mm. The exposed pad must be soldered to a PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM22675QMR-5.0/NOPB, LM22670QMR-5.0/NOPB trades automotive qualification for wider low-voltage operation, while TPS54302DDAR offers higher current and frequency in a thermally less robust package-neither is pin-compatible, and all require board-level validation for thermal and EMI performance.

Availability

LM22675QMR-5.0/NOPB is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom remote radio units requiring stable component supply across extended temperature and voltage ranges.

Supply support for LM22675QMR-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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The LM22675QMR-5.0/NOPB belongs to TI's SIMPLE SWITCHER® family-designed for ease-of-use, minimal external component count, and robust operation in harsh environments including automotive under-hood and factory automation settings.

FAQ

What is the maximum input voltage rating for LM22675QMR-5.0/NOPB?

The absolute maximum input voltage for LM22675QMR-5.0/NOPB is 43 V, but the recommended operating range is 4.5 V to 42 V. Exceeding 42 V risks violating the device's safe operating area, especially during transient events like load dump. Operation within the 4.5–42 V range ensures compliance with AEC-Q100 Grade 1 specifications and guarantees full performance across –40°C to +125°C junction temperature.

Does LM22675QMR-5.0/NOPB require an external feedback resistor network?

No, LM22675QMR-5.0/NOPB does not require an external feedback resistor network. It features an internal resistor divider configured for fixed 5.0 V output, with the FB pin internally connected to this network. The FB pin must be left unconnected or tied directly to the output capacitor's VOUT node-no external resistors are needed, reducing design complexity and improving accuracy versus adjustable variants.

Can LM22675QMR-5.0/NOPB be used in synchronous rectification configurations?

LM22675QMR-5.0/NOPB is not a synchronous buck controller-it drives an external Schottky catch diode via the SW pin and does not provide a second gate drive signal. While it supports high-efficiency operation with low-V_F Schottky diodes (e.g., 60 V, 1 A), true synchronous rectification requires a dual-MOSFET controller like the TPS54302DDAR. Using LM22675QMR-5.0/NOPB with a Schottky diode achieves >90% efficiency but lacks the ultra-low dropout and light-load advantages of synchronous topologies.

What thermal management is required for LM22675QMR-5.0/NOPB at full 1 A load?

At 1 A continuous load and 12 V input, LM22675QMR-5.0/NOPB dissipates approximately 0.7 W. To maintain ≤125°C junction temperature, the SO PowerPAD-8 exposed pad must be soldered to ≥1 square inch of 2-oz copper connected to GND. Without adequate copper, R_θJA rises from 60°C/W to >100°C/W, risking thermal shutdown. TI recommends using thermal vias under the EP and verifying temperature rise with IR imaging during prototype testing.

Is LM22675QMR-5.0/NOPB compatible with ceramic output capacitors?

Yes, LM22675QMR-5.0/NOPB is explicitly designed to be stable with low-ESR ceramic output capacitors-no electrolytic or tantalum capacitors are required. TI recommends ≥22 µF X5R/X7R ceramics placed close to the VOUT and GND pins. This ceramic compatibility reduces board area, improves reliability over temperature, and eliminates ESR-related aging effects common in wet electrolytics.