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LM22677TJE-ADJ/NOPB
Texas Instruments
IC REG BUCK ADJ 5A TO263-7
4526 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.285V 1 Output 5A TO-263-7 Thin
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5.0 / 5.0
- (222 Ratings)
LM22677TJE-ADJ/NOPB
Product Overview
1364461
DiGi Electronics Part Number
LM22677TJE-ADJ/NOPB-DGManufacturer
Texas Instruments
LM22677TJE-ADJ/NOPB
Description
IC REG BUCK ADJ 5A TO263-7Inventory
4526 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.285V 1 Output 5A TO-263-7 Thin
Quantity
Minimum 1
Minimum 1
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LM22677TJE-ADJ/NOPB Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SIMPLE SWITCHER®
Product Status
Active
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
4.5V
Voltage - Input (Max)
42V
Voltage - Output (Min/Fixed)
1.285V
Voltage - Output (Max)
37V
Current - Output
5A
Frequency - Switching
500kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
TO-263-7 Thin
Supplier Device Package
TO-263-7 Thin
Base Product Number
LM22677
Datasheet & Documents
Manufacturer Product Page
LM22677TJE-ADJ/NOPB Specifications
HTML Datasheet
LM22677TJE-ADJ/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM22677TJE-ADJ/NOPBTR
LM22677TJE-ADJCT
-LM22677TJE-ADJ-NDR
LM22677TJEADJNOPB
LM22677TJE-ADJ/NOPBCT
LM22677TJE-ADJDKR-DG
*LM22677TJE-ADJ/NOPB
-LM22677TJE-ADJ/NOPBCT-DG
LM22677TJE-ADJDKR
LM22677TJE-ADJ/NOPBDKR
LM22677TJE-ADJTR
LM22677TJE-ADJTR-DG
LM22677TJE-ADJCT-DG
Standard Package
250
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
DiGi Electronics' efficient logistics support complements their inventory system perfectly.
de desembre 02, 2025
They dispatched my order promptly, and tracking information was provided promptly.
de desembre 02, 2025
I found the checkout process to be so simple, saving me time and effort.
de desembre 02, 2025
Their after-sales team remains helpful and responsive, even after the sale.
de desembre 02, 2025
Impressed by how quickly my order was shipped and delivered.
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Frequently Asked Questions (FAQ)
What are the key thermal and layout considerations when designing a high-current (5A) power supply with the LM22677TJE-ADJ/NOPB in a compact PCB space, and how can I prevent thermal runaway or efficiency loss?
When designing with the LM22677TJE-ADJ/NOPB, proper thermal management is critical due to its 5A output capability and non-synchronous buck topology. Ensure a large, continuous ground plane under the TO-263-7 Thin package and use multiple thermal vias to dissipate heat from the exposed pad to inner or bottom layers. Keep high-di/dt switching loops (input capacitor, SW pin, inductor) as short as possible to minimize EMI and switching losses. Place the feedback resistors close to the FB pin to avoid noise pickup. Without adequate copper area or airflow, junction temperatures can exceed 125°C under load, leading to thermal shutdown or reduced lifespan—simulate thermal performance using TI’s WEBENCH tool and validate with infrared imaging during prototype testing.
Can the LM22677TJE-ADJ/NOPB safely replace an older LM2596-based design in a 24V to 5V/3A industrial application, and what design changes are required to avoid instability or overshoot?
Yes, the LM22677TJE-ADJ/NOPB can replace an LM2596 in a 24V-to-5V/3A application, but it requires significant redesign due to differences in control architecture and switching frequency. The LM22677TJE-ADJ/NOPB operates at 500kHz (vs. ~150kHz for LM2596), allowing smaller inductors and capacitors, but demands tighter compensation network design. You must recalculate the feedback resistor divider (targeting 1.285V reference) and ensure the output capacitor has low ESR and sufficient ripple current rating. Additionally, the faster switching edges increase susceptibility to layout-induced ringing—use a snubber if needed and verify transient response with a load step test to avoid output overshoot during startup or load changes.
How does the absence of synchronous rectification in the LM22677TJE-ADJ/NOPB impact efficiency at light loads, and what mitigation strategies should I use for battery-powered or always-on systems?
The LM22677TJE-ADJ/NOPB uses a non-synchronous buck topology, meaning it relies on an external Schottky diode for freewheeling current, which results in higher conduction losses—especially at light loads (e.g., <500mA)—compared to synchronous regulators like the TPS54360. This reduces efficiency by 5–10% in low-power modes, making it less ideal for battery-operated systems. To mitigate this, consider enabling pulse-skipping mode (if supported by your control scheme) or adding a load switch to disable the regulator during sleep states. For always-on applications, evaluate whether the cost and simplicity of the LM22677TJE-ADJ/NOPB outweigh the efficiency penalty, or switch to a synchronous alternative with integrated FETs for better light-load performance.
What are the risks of using the LM22677TJE-ADJ/NOPB in a 42V automotive input environment with load dump transients, and how can I protect it without compromising transient response?
The LM22677TJE-ADJ/NOPB has a maximum input voltage of 42V, which is at the edge of typical automotive load dump conditions (which can exceed 40V and reach 60V+). Direct exposure risks catastrophic failure. To protect the device, add a transient voltage suppressor (TVS) diode rated for 45–50V clamping voltage (e.g., SMAJ40A) at the input, combined with a series input fuse and bulk capacitance (≥100µF low-ESR electrolytic). Avoid over-filtering with large LC networks that can cause inrush current issues or destabilize the control loop. Always validate the design with ISO 7637-2 pulse testing to ensure robustness while maintaining stable regulation under normal operating conditions.
Is the LM22677TJE-ADJ/NOPB a suitable drop-in replacement for the LM22678TJE-ADJ in an existing design, and what parameters must be rechecked to ensure reliability?
The LM22677TJE-ADJ/NOPB is not a direct electrical drop-in for the LM22678TJE-ADJ despite similar part numbering—the key difference is output current: 5A vs. 3A. While both share the same pinout, package, and control architecture, replacing the LM22678 with the LM22677TJE-ADJ/NOPB in a 3A application may seem safe, but you must verify thermal performance, inductor saturation current, and input/output capacitor ripple ratings under peak load. The higher current capability of the LM22677TJE-ADJ/NOPB allows it to handle more stress, but if the original design used a marginal inductor or capacitors, they may now be operating beyond safe limits. Always re-evaluate the full power stage, including diode selection (if externally added) and PCB trace widths, to prevent overheating or premature failure.
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LM22677TJE-ADJ/NOPB CAD Models
Texas Instruments LM22677TJE-ADJ/NOPB PCB symbols & footprints
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