Texas Instruments LM22674MR-5.0/NOPB

Overview

LM22674MR-5.0/NOPB from Texas Instruments is a 42 V input, 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 bootstrap diode. It delivers high efficiency (>90%) in industrial power rails converting 12 V or 24 V inputs to stable 5 V for microcontroller core logic and peripheral interfaces.

For engineers reviewing the LM22674MR-5.0/NOPB datasheet, LM22674MR-5.0/NOPB pinout, LM22674MR-5.0/NOPB application, or LM22674MR-5.0/NOPB equivalent, key selection criteria include its 4.5–42 V wide input range, internal 200 mΩ N-channel MOSFET, precision enable threshold (1.6 V typ), thermal shutdown at 150°C, and SO PowerPAD™ package for enhanced thermal performance.

Technical Context

The LM22674MR-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain across input variations, enabling optimized transient response without external compensation. Its internal Type III compensator is tuned for fixed 5 V output configurations, supporting stable operation with low-ESR ceramic capacitors.

It integrates a precision enable pin with 0.6 V hysteresis and 6 µA input current, allowing reliable power sequencing and external UVLO implementation. The device uses a bootstrap capacitor between BOOT and SW pins to drive the high-side MOSFET gate, requiring ≥5 mA minimum load for full recharge during each off-cycle.

Key Specifications

Pinout & Package

LM22674MR-5.0/NOPB is housed in an 8-pin HSOP (PowerPAD™) package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for optimal heat dissipation. The package supports >1.5 W continuous power dissipation at T_A = 25°C (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 LM22674MR-5.0/NOPB, LM22670MR-5.0/NOPB offers higher frequency and lower VIN support but adds external component requirements, while TPS54302DDCR delivers triple the current in a smaller package but demands full schematic and layout revision due to architectural and pinout differences.

Availability

LM22674MR-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded systems requiring stable component supply with long-term manufacturability and automotive-grade traceability options.

Supply support for LM22674MR-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 ICs, with over 90 years of innovation in industrial, automotive, and communications markets.

The LM22674MR-5.0/NOPB belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC regulators, designed specifically for engineers needing robust, low-component-count buck solutions for harsh industrial and automotive environments.

FAQ

What is the maximum input voltage rating for the LM22674MR-5.0/NOPB?

The LM22674MR-5.0/NOPB has an absolute maximum input voltage rating of 43 V, with recommended operation from 4.5 V to 42 V. This allows direct interfacing with 24 V and 36 V industrial bus systems, including transient spikes common in motor-control or relay-switching environments. Exceeding 43 V risks permanent damage to the internal 42 V N-channel MOSFET and control circuitry.

Does the LM22674MR-5.0/NOPB require external feedback resistors to set the output voltage?

No, the LM22674MR-5.0/NOPB features a factory-trimmed internal feedback divider that fixes the output to 5.0 V ±1.5%. The FB pin is internally connected to the output, eliminating the need for external resistors. This simplifies PCB layout, improves noise immunity, and ensures consistent regulation without tolerance stacking from discrete components.

Can the LM22674MR-5.0/NOPB operate with ceramic output capacitors only?

Yes, the LM22674MR-5.0/NOPB is explicitly designed to be stable with low-ESR ceramic capacitors - typically ≥10 µF X7R or X5R MLCCs. Its internally compensated voltage-mode architecture avoids the phase-margin issues common with ceramic-only outputs in other buck controllers, removing the need for bulk tantalum or aluminum electrolytic capacitors.

What thermal performance can be expected from the LM22674MR-5.0/NOPB in a standard 2-layer PCB layout?

In a standard 2-layer PCB with 1 in² of 1 oz copper connected to the exposed PowerPAD™, the LM22674MR-5.0/NOPB achieves a junction-to-ambient thermal resistance (R_θJA) of approximately 60°C/W. At 500 mA load and 12 V input, typical power dissipation is ~0.5 W, resulting in ~30°C junction rise above ambient - well within the –40°C to +125°C operating range.

Is the LM22674MR-5.0/NOPB pin-compatible with the LM22674-Q1 automotive variant?

Yes, the LM22674MR-5.0/NOPB and LM22674-Q1 share identical pinout, package (HSOP-8 with PowerPAD™), and electrical specifications. The LM22674-Q1 adds AEC-Q100 Grade 1 qualification (–40°C to +125°C), enhanced ESD robustness, and automotive-specific test reporting - making it a direct replacement where automotive reliability is mandated.