Texas Instruments LM22673QMRE-5.0/NOPB

Overview

LM22673QMRE-5.0/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator in HSOP-8 PowerPAD package, featuring fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and internal voltage-mode compensation. It delivers high efficiency (>90%) in industrial power rails converting 12 V or 24 V inputs to stable 5 V for microcontroller cores and peripheral logic.

For engineers reviewing the LM22673QMRE-5.0/NOPB datasheet, LM22673QMRE-5.0/NOPB pinout, LM22673QMRE-5.0/NOPB application, or LM22673QMRE-5.0/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance in HSOP-8 exposed-pad package, adjustable current limit via IADJ pin, integrated bootstrap diode, and automotive-grade qualification (Q1 variant referenced in family documentation).

Technical Context

The LM22673QMRE-5.0/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize 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, supports ceramic output capacitors with low ESR, and enforces minimum on-time (100 ns) and off-time (200 ns) constraints to ensure reliable current sensing and bootstrap capacitor recharge-critical for stable operation at high input-to-output voltage ratios.

Key Specifications

Pinout & Package

LM22673QMRE-5.0/NOPB uses an HSOP-8 PowerPAD (exposed pad) package measuring 4.89 mm × 3.90 mm. The exposed pad must be soldered to a PCB thermal plane connected to GND for optimal thermal performance (R_θJA = 22 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM22673QMRE-5.0/NOPB, the LM22674MRE-5.0/NOPB offers superior thermal handling in high-power scenarios but demands larger board space, while the TPS54340DDAR provides higher current headroom and lower standby consumption at the cost of added external components and loss of current-limit adjustability.

Availability

LM22673QMRE-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.

Supply support for LM22673QMRE-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 90 years of innovation in industrial, automotive, and communications markets.

The LM22673 product line delivers SIMPLE SWITCHER® step-down regulators targeting high-voltage industrial and automotive applications where reliability, minimal external components, and WEBENCH®-enabled design integration are critical.

FAQ

What is the maximum input voltage rating for LM22673QMRE-5.0/NOPB?

The LM22673QMRE-5.0/NOPB has an absolute maximum input voltage rating of 43 V, with recommended operating range from 4.5 V to 42 V. Operation above 42 V risks exceeding safe operating area limits, especially under transient conditions like load dump. The device incorporates undervoltage lockout (UVLO) that disables switching below 3.9 V (falling threshold) and re-enables at 4.3 V (rising threshold), ensuring robust startup behavior across wide input rails.

Does LM22673QMRE-5.0/NOPB require an external feedback resistor divider?

No, LM22673QMRE-5.0/NOPB does not require an external feedback resistor divider because it features a factory-trimmed internal reference and fixed 5.0 V output configuration. The FB pin is internally connected to the 5 V regulation node and must be shorted directly to the output capacitor's VOUT node. This eliminates feedback component tolerance errors and layout sensitivity associated with high-impedance divider networks-key for stable 5 V generation in noise-prone environments.

How is current limit adjusted on LM22673QMRE-5.0/NOPB?

Current limit on LM22673QMRE-5.0/NOPB is adjusted using a single resistor connected between the IADJ pin and GND. With IADJ open, the device defaults to 4.2 A (typical) peak switch current. Adding a resistor sets the limit per Figure 12 in the datasheet: e.g., 10 kΩ yields ~3.5 A, while 2.2 kΩ raises it to ~5.0 A. Accuracy degrades to ±35%/–25% when adjusted, and the resistor must remain within 1 kΩ–100 kΩ to avoid invalid states or excessive bias current.

What thermal considerations apply to LM22673QMRE-5.0/NOPB in HSOP-8 PowerPAD package?

LM22673QMRE-5.0/NOPB in HSOP-8 PowerPAD has a junction-to-ambient thermal resistance (R_θJA) of 22 °C/W when the exposed pad is fully soldered to a 1-in² copper pour connected to GND. To maintain T_J ≤125°C at 3 A output with 24 V input, ambient temperature must stay below ~75°C assuming typical 90% efficiency. Thermal vias under the pad (≥6×0.3 mm) and inner-layer copper planes significantly improve heat spreading-failure to connect the EP results in thermal runaway and premature shutdown.

Is LM22673QMRE-5.0/NOPB qualified for automotive applications?

LM22673QMRE-5.0/NOPB itself is not AEC-Q100 qualified; however, it belongs to the LM22673-Q1 family, where the Q1 suffix denotes automotive-grade qualification (Grade 1: –40°C to +125°C junction). The QMRE-5.0/NOPB variant shares identical electrical specifications and pinout but lacks the automotive-specific test documentation and traceability. For production automotive systems, TI recommends LM22673QMRX-5.0/NOPB (Q1-compliant) instead of LM22673QMRE-5.0/NOPB.