Texas Instruments LM22673QMR-5.0/NOPB

Overview

LM22673QMR-5.0/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package, featuring fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode - used as a primary voltage regulator in industrial power supplies and telecom front-end converters.

For engineers reviewing the LM22673QMR-5.0/NOPB datasheet, LM22673QMR-5.0/NOPB pinout, LM22673QMR-5.0/NOPB application, or LM22673QMR-5.0/NOPB equivalent, key selection considerations include input voltage range (4.5–42 V), thermal performance in HSOP-8 exposed-pad layout, current limit adjustability via IADJ pin, soft-start timing control, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The LM22673QMR-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward for stable loop gain across wide VIN ranges. Its internal Type III compensation is optimized for fixed 5 V output, eliminating external compensation components.

It integrates a 120 mΩ N-channel MOSFET switch and uses a bootstrap capacitor between BOOT and SW to drive the high-side gate. Minimum on-time (100 ns) and off-time (200 ns) constrain practical VIN/VOUT ratios and enforce minimum load (~5 mA) for boot-cap recharge.

Key Specifications

Pinout & Package

LM22673QMR-5.0/NOPB uses an HSOP-8 PowerPAD package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM22673QMR-5.0/NOPB, LM22674QMR-5.0/NOPB trades efficiency for size reduction via higher frequency, while TPS54340QDDARQ1 adds flexibility at the cost of design complexity and component count - making LM22673QMR-5.0/NOPB optimal for cost-sensitive, thermally constrained 5 V systems needing proven simplicity and automotive qualification.

Availability

LM22673QMR-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and automotive body electronics requiring stable component supply over extended product lifecycles.

Supply support for LM22673QMR-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 over 50 years of innovation in power conversion ICs.

The LM22673 product line delivers SIMPLE SWITCHER® buck regulators targeting high-voltage industrial, automotive, and telecom applications where reliability, wide input range, and minimal external components are critical.

FAQ

What is the maximum input voltage rating for LM22673QMR-5.0/NOPB?

The absolute maximum input voltage for LM22673QMR-5.0/NOPB is 43 V, with recommended operating range from 4.5 V to 42 V. Operation above 42 V risks exceeding safe SOA limits under transient conditions. The device includes undervoltage lockout (UVLO) that disables switching below 3.9 V (falling) and re-enables at 4.3 V (rising), ensuring clean startup from 5 V, 12 V, or 24 V rails. This rating is confirmed in Section 6.1 of the SNVS586O datasheet.

Does LM22673QMR-5.0/NOPB require an external feedback resistor divider?

No, LM22673QMR-5.0/NOPB does not require an external feedback resistor divider because it features a factory-trimmed internal 5.0 V reference connected directly to the FB pin. The FB pin is intended to be shorted to the output node, enabling fixed 5 V regulation without external components. This differs from the LM22673-ADJ variant, which requires a two-resistor divider. The internal reference accuracy is ±1.5% over –40°C to +125°C junction temperature, as specified in Table 6.6 of the datasheet.

How is thermal performance managed in the HSOP-8 PowerPAD package of LM22673QMR-5.0/NOPB?

Thermal performance of LM22673QMR-5.0/NOPB relies on its HSOP-8 PowerPAD package with an exposed copper pad that must be soldered to a large PCB copper pour connected to system ground. This configuration achieves a junction-to-ambient thermal resistance (R_θJA) of 22°C/W, significantly lower than the 60°C/W of the SO PowerPAD variant. Proper thermal vias (≥6×0.3 mm diameter) under the pad and ≥2 oz copper on inner layers are required to sustain 3 A continuous output at +85°C ambient. Thermal shutdown activates at 150°C junction temperature, with hysteresis returning operation at ~135°C.

Can the current limit of LM22673QMR-5.0/NOPB be adjusted, and how?

Yes, the peak switch current limit of LM22673QMR-5.0/NOPB can be adjusted using a single resistor from the IADJ pin (Pin 5) to GND. With IADJ open, the default current limit is 4.2 A (typical). Connecting a resistor sets the limit per Figure 12 in the datasheet: e.g., 10 kΩ yields ~3.5 A, 2.2 kΩ yields ~4.8 A. Accuracy degrades to +35%/–25% when adjusted. The IADJ pin sources a weak internal current during startup (~100 µs window), after which the resistor value is latched. This feature allows tailoring current capability to match actual load requirements and optimize external component sizing.

Is LM22673QMR-5.0/NOPB qualified for automotive applications?

Yes, LM22673QMR-5.0/NOPB is AEC-Q100 Grade 1 qualified (–40°C to +125°C junction temperature) and designated as an automotive-grade part. The "Q" suffix in the part number explicitly denotes this qualification. It includes enhanced ESD protection (2 kV HBM), extended temperature validation, and production testing per automotive reliability standards. The device is designed for use in body control modules, infotainment power supplies, and ADAS subsystems where robustness against vibration, thermal cycling, and electrical transients is mandatory - confirmed in Section 1 of the SNVS586O datasheet.