LM22678-ADJ Texas Instruments Integrated Circuit (Other) In Stock
LM22678-ADJ is a SIMPLE SWITCHER step-down voltage regulator from Texas Instruments with 4.5 V to 42 V input range and 5 A output current. It features adjustable output voltage, precision enable threshold, and high efficiency switching operation. Available in multiple packages, in stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LM22678-ADJ Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Wide 4.5 V to 42 V input range covers automotive, industrial 24 V, and distributed 36 V power bus applications in a single device
- 5 A continuous output current with high-efficiency switching reduces heat dissipation compared to linear regulators in point-of-load designs
- Precision enable pin with accurate threshold voltage allows microcontroller or voltage supervisor to control power sequencing reliably
Applications
The LM22678-ADJ is designed for industrial power supplies, automotive accessories, and distributed point-of-load converters where a wide input voltage range and high output current are needed in a compact switcher footprint. Its adjustable output voltage from approximately 1.28 V to 40 V suits powering FPGAs, DSPs, and microcontrollers from 12 V, 24 V, or 36 V bus rails. The SIMPLE SWITCHER architecture minimizes external component count, requiring only a few passive components to build a complete 5 A buck converter.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LM22678-ADJ:
Switching Regulator, Voltage-mode, 8.75A, 600kHz Switching Freq-Max, BICMOS, PSSO7
Switching Regulator, Voltage-mode, 5A, 500kHz Switching Freq-Max, BICMOS, PSSO7
Switching Regulator, Voltage-mode, 5A, 500kHz Switching Freq-Max, BICMOS, PSSO7
Frequently Asked Questions
What is the input voltage range of the LM22678-ADJ, and which power bus standards does it support directly?
The LM22678-ADJ accepts input voltages from 4.5 V to 42 V, covering standard industrial 12 V and 24 V bus rails, automotive 12 V and 24 V supply rails, and telecom 36 V or 48 V buses when stepped down through a pre-regulator. This wide range eliminates the need for separate regulator variants in multi-rail systems. The 42 V maximum input rating also handles 24 V bus load-dump transients common in industrial motor control cabinets without additional TVS protection.
How does the precision enable pin on the LM22678-ADJ improve power sequencing in multi-rail embedded systems?
The precision enable threshold allows a microcontroller GPIO or voltage supervisor IC to turn the LM22678-ADJ on and off at a defined voltage level, ensuring predictable power sequencing relative to other rails. Unlike regulators with wide enable threshold tolerances of ±20%, a precision enable threshold below ±5% guarantees the rail starts only when the enable signal exceeds a known voltage, preventing partial startup states that can latch-up downstream logic. This is particularly important in FPGA power sequencing where core voltage must ramp before I/O voltage.
For a 24 V industrial panel to 5 V, 5 A point-of-load converter, how does LM22678-ADJ compare to a linear regulator solution?
Using LM22678-ADJ in switching mode converts 24 V to 5 V at 5 A with typical efficiency above 85%, dissipating approximately 4 W or less as heat. A linear regulator handling the same conversion would dissipate 19 V × 5 A = 95 W as heat, requiring a large heatsink. The LM22678-ADJ's higher efficiency directly reduces thermal management cost and enables fanless 5 A designs. External components include only 1 inductor, 2 capacitors, and 2 resistors to set output voltage, keeping BOM minimal.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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