LM22676MRX-ADJ-NOPB is TI's high-voltage step-down DC-DC converter with integrated power MOSFET, accepting 4.5V~40V wide input and adjustable output 1.285V~37V at 3A continuous current. Fixed 500kHz switching frequency enables compact inductor sizing. The device uses PWM current-mode control (Cuk-derived topology) for excellent load transient response and simple external compensation (RC network only).

LM22676 belongs to TI's Simple Switcher® family, with the core advantage of minimal external component count - a typical application requires only input/output capacitors, an inductor, and two feedback resistors. Compared to discrete MOSFET solutions, the integrated design reduces PCB complexity, improves system reliability, and lowers BOM cost.

The NOPB (No-Lead / Pb-Free) package variant is RoHS compliant, suitable for industrial instruments, communication equipment, embedded systems, and battery charging management where reliability and environmental compliance are critical.

Note: For detailed electrical parameters, thermal management design, and EMI optimization guidelines, refer to the official TI datasheet. Specifications are subject to change without notice. Engineers should verify all parameters before final design.

LM22676MRX-ADJ-NOPB uses standard SOIC-8 (Small Outline Integrated Circuit, 8-pin) package with 1.27mm pin pitch, compatible with standard SMT assembly. The package has 8 gull-wing leads; the bottom pad is not thermally enhanced, resulting in relatively high thermal resistance (θJA ≈ 125°C/W). PCB copper area (≥15mm×15mm) is recommended for heat dissipation.

The NOPB suffix indicates lead-free/RoHS compliant version per RoHS Directive 2011/65/EU. Compatible with lead-free solder reflow profiles per JEDEC J-STD-020.

LM22676MRX-ADJ-NOPB SOIC-8 package has 8 functional pins:

• Pin 1 - BOOT: High-side MOSFET driver bootstrap pin. Connect a 1μF capacitor between BOOT and SW to provide bias voltage for the high-side gate driver. Must not be left floating.
• Pin 2 - VIN: Chip supply input positive terminal. Place a 10μF input filter capacitor close between VIN and PGND to suppress voltage spikes from input cable inductance.
• Pin 3 - SW: Switching node connecting to the inductor input. This pin carries up to 3A; route it wide and short to minimize switching losses and EMI radiation.
• Pin 4 - PGND: Power ground. Low-side MOSFET source and power return path. Connect to signal ground AGND at a single point to avoid switching noise coupling.
• Pin 5 - FB: Output voltage feedback pin. Connect to the midpoint of the output resistor divider. Output is set: VOUT = 1.285V × (1 + R_TOP/R_BOTTOM). Never connect FB to ground - this causes output overvoltage damage.
• Pin 6 - COMP/EN: Error amplifier output / chip enable dual-function pin. Connect compensation network (RC feedforward). Can also serve as remote on/off control (pull low to shut down, pull high to enable).

The following alternative parts are listed for reference. Before selecting an alternative, verify input voltage range, output current capability, switching frequency, and package compatibility.

Selection tips: Key points: VIN_max should exceed the maximum input voltage by 20%+; IOUT should be 1.5~2× the maximum load current; switching frequency affects inductor sizing and EMI; package determines thermal management approach (high current prefers TO-263/TO-220, space-constrained prefers SOIC-8/SOP-8).

Texas Instruments (NASDAQ: TXN), headquartered in Dallas, Texas, USA, is one of the world's largest analog semiconductor companies. TI's products span amplifiers, data converters, interface chips, embedded processors, and power management devices. TI's Simple Switcher® DC-DC converter family, launched in the 1990s, has become an industry standard for industrial power and consumer electronics due to its minimal external component design and extensive technical documentation.

LM22676 belongs to TI's Simple Switcher Plus family, continuing the SIMPLE SWITCHER philosophy of minimal external design. TI provides complete WEBENCH® online design tool support - engineers input VIN, VOUT, and load current parameters to automatically generate schematics, BOM lists, and efficiency simulation reports, significantly shortening the design cycle. TI has multiple technical support offices and local warehouses in China for fast sample and production fulfillment.