Texas Instruments LM22678TJ-ADJ/J7002567

Overview

LM22678TJ-ADJ/J7002567 from Texas Instruments is a 42-V input, 5-A synchronous step-down DC/DC regulator in TO-263-7 (PFM) package, featuring adjustable output down to 1.285 V, 500-kHz fixed switching frequency, and internal voltage-mode compensation. It integrates a 100-mΩ N-channel MOSFET switch, precision enable pin, and integrated bootstrap diode-designed for industrial power rails requiring high VIN stability and compact layout.

For engineers reviewing the LM22678TJ-ADJ/J7002567 datasheet, LM22678TJ-ADJ/J7002567 pinout, LM22678TJ-ADJ/J7002567 application, or LM22678TJ-ADJ/J7002567 equivalent, this device supports wide-input distributed power systems where thermal robustness, ±1.5% feedback accuracy, and 25 µA shutdown current are critical selection criteria.

Technical Context

The LM22678TJ-ADJ/J7002567 employs 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 output voltages ≤5 V, supporting stable operation with low-ESR ceramic capacitors and standard power inductors.

It features a precision enable threshold (1.6 V typ., 0.6 V hysteresis), integrated soft-start (500 µs), thermal shutdown at 150°C, and cycle-by-cycle current limiting (6.0–8.4 A). The BOOT/SW bootstrap circuit requires a 10-nF ceramic capacitor and mandates ≥5 mA minimum load for reliable gate drive recharge during minimum off-time (200 ns).

Key Specifications

Pinout & Package

LM22678TJ-ADJ/J7002567 is housed in a thermally enhanced TO-263-7 (PFM) package (10.16 mm × 9.85 mm) with exposed pad for PCB ground connection and thermal dissipation. The exposed pad must be soldered to ≥1 in² copper area for 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 LM22678TJ-ADJ/J7002567, LM22678TJ-5.0 removes design flexibility but simplifies BOM, while LM61460QWRNXTQ1 offers superior light-load efficiency and automotive qualification at the cost of reduced max input voltage and stricter EMI layout rules.

Availability

LM22678TJ-ADJ/J7002567 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 LM22678TJ-ADJ/J7002567 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 decades of expertise in high-reliability power conversion solutions.

The LM22678 series belongs to TI's SIMPLE SWITCHER® family-designed for ease-of-use in wide-input industrial and automotive power supplies, minimizing external components and accelerating time-to-market via WEBENCH® integration.

FAQ

What is the minimum output voltage supported by LM22678TJ-ADJ/J7002567?

The LM22678TJ-ADJ/J7002567 supports a minimum output voltage of 1.285 V (typical), set by its internal feedback reference voltage. This value is specified over temperature (–40°C to +125°C) with ±1.5% accuracy, enabling precise low-voltage rails for modern microcontrollers and FPGAs. The actual output is configured using an external resistor divider connected to the FB pin, with recommended top resistor (R_FBB) of 1 kΩ for noise immunity and minimum load compliance.

Does LM22678TJ-ADJ/J7002567 require an external bootstrap diode?

No, LM22678TJ-ADJ/J7002567 integrates a bootstrap diode internally, eliminating the need for an external component. The BOOT pin must still be connected to the SW node via a 10-nF ceramic capacitor with short, low-inductance traces. This integrated feature reduces bill-of-materials count and improves reliability compared to controllers requiring discrete bootstrap diodes, while maintaining compatibility with standard buck converter layouts.

What is the thermal resistance (R_θJA) of LM22678TJ-ADJ/J7002567 in its TO-263-7 package?

The LM22678TJ-ADJ/J7002567 has a junction-to-ambient thermal resistance (R_θJA) of 22°C/W when mounted on 1 square inch of 2-oz copper PCB. This value assumes proper soldering of the exposed pad to the ground plane. R_θJA can vary between 20–30°C/W depending on PCB copper area and thermal vias-designers should verify thermal performance under worst-case load and ambient conditions using TI's AN-1797 guidelines.

Can LM22678TJ-ADJ/J7002567 operate with ceramic output capacitors only?

Yes, LM22678TJ-ADJ/J7002567 is explicitly designed to be stable with low-ESR ceramic output capacitors-no electrolytic or tantalum capacitors are required. Its internally compensated voltage-mode architecture and optimized loop response accommodate typical X5R/X7R MLCCs, reducing footprint, improving lifetime reliability, and avoiding capacitance drift over temperature and time.

What protection features are built into LM22678TJ-ADJ/J7002567?

LM22678TJ-ADJ/J7002567 includes cycle-by-cycle current limiting (6.0–8.4 A), thermal shutdown at ~150°C with ~135°C hysteresis, input undervoltage lockout (UVLO: 4.3 V rise / 3.9 V fall), and precision enable pin with 0.6 V hysteresis. These features protect against overloads, short circuits, overheating, and brown-out conditions-enabling robust operation in unattended industrial environments without external supervision circuitry.