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LM22677TJ-ADJ/NOPB
Texas Instruments
IC REG BUCK ADJ 5A TO263-7
5186 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.285V 1 Output 5A TO-263-7 Thin
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Minimum 1
5.0 / 5.0
- (337 Ratings)
LM22677TJ-ADJ/NOPB
Product Overview
1333983
DiGi Electronics Part Number
LM22677TJ-ADJ/NOPB-DGManufacturer
Texas Instruments
LM22677TJ-ADJ/NOPB
Description
IC REG BUCK ADJ 5A TO263-7Inventory
5186 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
Purchase and inquiry
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LM22677TJ-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
LM22677TJ-ADJ/NOPB Specifications
HTML Datasheet
LM22677TJ-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
LM22677TJ-ADJ/NOPBTR
LM22677TJADJNOPB
LM22677TJ-ADJ/NOPBCT
LM22677TJ-ADJ/NOPBDKR
LM22677TJ-ADJ
LM22677TJ-ADJ-DG
Standard Package
1,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
배송 과정 내내 포장 상태가 유지되어 수령할 때까지 만족했고, 물류 추적도 정확했습니다.
de desembre 02, 2025
Livraison très efficace, j’ai toujours reçu mes commandes à temps. Service impeccable.
de desembre 02, 2025
I appreciate their friendly service and affordable pricing on all items.
de desembre 02, 2025
Their wide selection of products highlights their dedication to serving a broad customer base.
de desembre 02, 2025
Shopping with DiGi Electronics feels secure thanks to their friendly approach and fair prices.
de desembre 02, 2025
The overall shopping experience, including rapid delivery, was top-notch.
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Frequently Asked Questions (FAQ)
Can the LM22677TJ-ADJ/NOPB safely replace an LM2596-based design in a 24V-to-5V, 3A industrial application, and what layout changes are critical to avoid instability?
The LM22677TJ-ADJ/NOPB is a technically viable replacement for the LM2596 in a 24V-to-5V, 3A application due to its higher efficiency, wider input range (up to 42V), and 5A output capability. However, direct pin-for-pin substitution is not recommended—the LM22677TJ-ADJ/NOPB operates at 500kHz (vs. 150kHz for LM2596), requiring a smaller output inductor and faster feedback compensation. Critical layout changes include minimizing the high-di/dt loop between the SW pin, input capacitor, and ground, using a single-point ground for feedback resistors, and ensuring the bootstrap capacitor is placed within 5mm of the BOOT and SW pins. Without these adjustments, voltage overshoot or subharmonic oscillation may occur under transient loads.
What are the thermal risks when using the LM22677TJ-ADJ/NOPB in a sealed enclosure with ambient temperatures up to 85°C, and how should the PCB be designed to maintain junction temperature below 125°C?
In a sealed enclosure at 85°C ambient, the LM22677TJ-ADJ/NOPB’s junction temperature can exceed safe limits without proper thermal design. With a typical RθJA of ~30°C/W on a 2-layer board, dissipating 3W (e.g., 12V to 3.3V at 3A) results in ΔT ≈ 90°C, pushing Tj to 175°C—well above the 125°C max. To mitigate this, use a 4-layer PCB with an internal ground plane, increase copper area under the tab (≥ 2 in² of 2oz copper), and add thermal vias (≥ 9 vias of 0.3mm diameter) connecting the exposed pad to the bottom layer. Active airflow or a small heatsink may be required if power dissipation exceeds 2W in high-ambient environments.
How does the LM22677TJ-ADJ/NOPB compare to the newer TPS54560 in terms of efficiency, noise, and design complexity for a 12V-to-3.3V, 4A automotive application?
The LM22677TJ-ADJ/NOPB offers simpler design and lower BOM cost than the TPS54560, making it attractive for cost-sensitive automotive applications. However, the TPS54560 provides superior efficiency (~5% higher at light loads due to pulse-skipping mode), lower output ripple (<20mVpp vs. ~50mVpp), and integrated FETs with better thermal performance. The LM22677TJ-ADJ/NOPB requires an external diode and careful compensation tuning, while the TPS54560 includes internal soft-start and hiccup-mode protection. For EMI-sensitive systems, the TPS54560’s spread-spectrum option is advantageous, but if board space and component count are constrained and peak efficiency isn’t critical, the LM22677TJ-ADJ/NOPB remains a robust choice.
What input voltage transients can the LM22677TJ-ADJ/NOPB withstand without damage, and how should input protection be designed for a 24V industrial bus subject to load dump events?
The LM22677TJ-ADJ/NOPB has a maximum input voltage of 42V, but industrial 24V systems can experience load dump transients exceeding 60V. Without protection, these events can destroy the IC. To safeguard the LM22677TJ-ADJ/NOPB, use a TVS diode (e.g., SMAJ33A, 33V clamping) rated for Ipp ≥ 5A, placed close to the input capacitor. Add a 10Ω series resistor followed by a 100µF low-ESR electrolytic capacitor to dampen ringing. For harsh environments, consider a pre-regulator or active clamp circuit. Always verify transient suppression with an oscilloscope during surge testing to ensure VIN never exceeds 42V at the IC pin.
Is it safe to parallel two LM22677TJ-ADJ/NOPB regulators to achieve 10A output current, and what synchronization or current-sharing techniques are required to prevent thermal runaway?
Paralleling two LM22677TJ-ADJ/NOPB devices for 10A output is not recommended without external current-sharing circuitry, as the lack of synchronization and matched feedback networks leads to unequal load sharing. Even minor differences in feedback resistor tolerance or trace impedance can cause one IC to carry >70% of the load, leading to localized overheating and premature failure. If higher current is needed, consider a dedicated multi-phase controller like the LM5145 or use a single higher-current regulator such as the LM25145. If paralleling is unavoidable, implement ballast resistors (0.1Ω, 2W) in series with each output and use a common feedback point derived from the combined output—though this reduces efficiency and increases dropout voltage.
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LM22677TJ-ADJ/NOPB CAD Models
Texas Instruments LM22677TJ-ADJ/NOPB PCB symbols & footprints
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