Texas Instruments LM22678QTJE-5.0/NOPB

Overview

LM22678QTJE-5.0/NOPB from Texas Instruments is a 42-V input, 5-A synchronous step-down DC/DC regulator with fixed 5.0-V output, 500-kHz switching frequency, ±1.5% feedback reference accuracy, and integrated 100-mΩ N-channel MOSFET. It operates from –40°C to +125°C and delivers >90% efficiency in industrial power conversion applications.

For engineers reviewing the LM22678QTJE-5.0/NOPB datasheet, LM22678QTJE-5.0/NOPB pinout, LM22678QTJE-5.0/NOPB application, or LM22678QTJE-5.0/NOPB equivalent, key selection criteria include wide VIN (4.5–42 V), thermal shutdown at 150°C, precision enable threshold (1.6 V typ.), internal soft-start (500 µs), and stable operation with low-ESR ceramic capacitors.

Technical Context

The LM22678QTJE-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward for loop gain stabilization across input variations. Its internal Type III compensation eliminates external compensation components and is optimized for fixed 5-V output configurations.

It integrates a bootstrap diode and gate driver for high-side MOSFET control, requires only a 10-nF ceramic capacitor between BOOT and SW, and enforces minimum on-time (100 ns) and off-time (200 ns) to ensure reliable current sensing and bootstrap recharge under all operating conditions.

Key Specifications

Pinout & Package

LM22678QTJE-5.0/NOPB uses the PFM (TO-263-7) package: 10.16 mm × 9.85 mm body with exposed thermal pad (EP) soldered to PCB ground for enhanced thermal performance (R_θJA = 22°C/W with 1-in² copper).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM22678QTJE-5.0/NOPB, LM22670TJE-5.0/NOPB offers reduced current and voltage ratings for cost-sensitive 3-A applications, while LM61460QWRFRQ1 provides automotive qualification, higher current, and advanced EMI mitigation - making it suitable for next-generation vehicle electronics where LM22678QTJE-5.0/NOPB meets legacy industrial needs.

Availability

LM22678QTJE-5.0/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, test and measurement equipment, and appliance control boards requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LM22678QTJE-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 designing analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.

LM22678QTJE-5.0/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in high-voltage DC/DC conversion, minimizing external components and enabling rapid design-in via WEBENCH® tools.

FAQ

What is the maximum input voltage rating for LM22678QTJE-5.0/NOPB?

The absolute maximum input voltage for LM22678QTJE-5.0/NOPB is 43 V, with recommended operation from 4.5 V to 42 V. Exceeding 42 V may trigger overvoltage protection or degrade reliability. The device sustains 42-V transients common in automotive and industrial environments, and its internal 100-mΩ MOSFET and thermal shutdown (150°C) ensure safe operation within this range. Always verify input filtering and clamping per application requirements.

Does LM22678QTJE-5.0/NOPB require an external feedback resistor divider?

No, LM22678QTJE-5.0/NOPB does not require an external feedback resistor divider because it features a factory-trimmed internal 5.0-V reference and fixed-output configuration. The FB pin is internally connected to the output; users simply short FB to VOUT. This eliminates resistor tolerance errors, layout sensitivity, and thermal drift associated with external dividers - a key advantage over adjustable versions like LM22678-ADJ.

What thermal management is required for LM22678QTJE-5.0/NOPB at full 5-A load?

At full 5-A load and 12-V input, LM22678QTJE-5.0/NOPB dissipates ~1.5 W. To maintain junction temperature ≤125°C, the exposed pad (EP) must be soldered to ≥1 in² of 2-oz copper with thermal vias to inner/ground planes. With this layout, R_θJA is 22°C/W, yielding ~33°C rise above ambient - well within limits. For higher ambient or tighter margins, add airflow or local copper pour. Thermal shutdown activates at 150°C as a fail-safe.

Can LM22678QTJE-5.0/NOPB be used in automotive applications?

LM22678QTJE-5.0/NOPB is not AEC-Q100 qualified. For automotive use, TI specifies the LM22678-Q1 variant (e.g., LM22678QQTJE-5.0/NOPB), which is AEC-Q100 Grade 1 qualified (–40°C to +125°C). While LM22678QTJE-5.0/NOPB shares identical electrical specs and package, only the -Q1 suffix denotes automotive qualification, including enhanced process controls, extended testing, and failure analysis traceability required for vehicle systems.

How does the enable pin (EN) function on LM22678QTJE-5.0/NOPB?

The EN pin on LM22678QTJE-5.0/NOPB provides precision logic-level control: device turns ON when EN ≥1.6 V (typ) and OFF when EN ≤1.3 V (min), with 0.6-V hysteresis. An internal 6-µA pullup allows direct connection to VIN via a 470-kΩ resistor for automatic startup. Driving EN externally enables power sequencing, remote shutdown, or external UVLO implementation - critical for system-level power management in multi-rail designs.