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LM2677SD-ADJ
Texas Instruments
IC REG BUCK ADJ 5A 14VSON
1721 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.21V 1 Output 5A 14-VDFN Exposed Pad
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5.0 / 5.0
- (369 Ratings)
LM2677SD-ADJ
Product Overview
1517444
DiGi Electronics Part Number
LM2677SD-ADJ-DGManufacturer
Texas Instruments
LM2677SD-ADJ
Description
IC REG BUCK ADJ 5A 14VSONInventory
1721 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.21V 1 Output 5A 14-VDFN Exposed Pad
Quantity
Minimum 1
Minimum 1
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LM2677SD-ADJ Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
-
Series
SIMPLE SWITCHER®
Product Status
Not For New Designs
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
8V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
1.21V
Voltage - Output (Max)
37V
Current - Output
5A
Frequency - Switching
260kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
14-VDFN Exposed Pad
Supplier Device Package
14-VSON (5x6)
Base Product Number
LM2677
Datasheet & Documents
Manufacturer Product Page
LM2677SD-ADJ Specifications
HTML Datasheet
LM2677SD-ADJ-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM2677SD-ADJCT
LM2677SD-ADJDKR
LM2677SD-ADJTR
LM2677SDADJ
Standard Package
250
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
配送状況の通知が頻繁で、到着まで安心して待てます。
de desembre 02, 2025
迅速な配送と丁寧なサポートにより、非常に満足しています。今後も利用したいです。
de desembre 02, 2025
Speedy delivery combined with long-lasting quality makes DiGi Electronics my preferred vendor.
de desembre 02, 2025
Outstanding shipping efficiency coupled with support that truly cares.
de desembre 02, 2025
Their reliable delivery and careful packaging make them a key partner for us.
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Frequently Asked Questions (FAQ)
Can the LM2677SD-ADJ be safely used as a drop-in replacement for the LM2596HV in a 24V-to-5V industrial power supply design, and what layout or thermal modifications are required?
The LM2677SD-ADJ is not a direct drop-in replacement for the LM2596HV due to differences in package, pinout, and switching frequency. While both are 5A buck regulators with similar input voltage ranges (LM2677SD-ADJ supports up to 40V, LM2596HV up to 60V), the LM2677SD-ADJ uses a 14-VSON exposed pad package requiring a solid thermal ground plane and careful PCB layout for heat dissipation. Additionally, its 260kHz switching frequency may require different input/output filter components compared to the LM2596HV’s 150kHz. You must redesign the feedback network and verify stability under load transients. Thermal vias under the exposed pad are essential to avoid overheating, especially in enclosed industrial environments.
What are the key reliability risks when operating the LM2677SD-ADJ near its maximum input voltage of 40V in an automotive load-dump scenario, and how can they be mitigated?
Operating the LM2677SD-ADJ at or near 40V input in automotive applications exposes it to risk from transient overvoltage events like load dumps, which can exceed 40V and damage the IC. Although the part is rated for 40V continuous, ISO 7637-2 pulses can reach 45–60V. To mitigate this, use a front-end TVS diode (e.g., SMAJ40A) rated for 40V clamping and add an LC filter to attenuate transients. Also, ensure the input capacitor network has sufficient voltage derating (use 50V-rated caps) and low ESR to handle surge currents. Without these protections, long-term reliability will degrade due to cumulative stress on the internal MOSFET.
How does the lack of synchronous rectification in the LM2677SD-ADJ impact efficiency at light loads, and what design trade-offs should be considered when replacing it with a modern synchronous buck like the TPS54560?
The LM2677SD-ADJ uses a non-synchronous buck topology with an external Schottky diode for freewheeling, which results in significantly lower efficiency at light loads (typically <60% at 100mA) due to fixed diode conduction losses. In contrast, synchronous regulators like the TPS54560 use an integrated low-side FET, achieving >85% efficiency across the load range. Replacing the LM2677SD-ADJ with the TPS54560 improves efficiency and thermal performance but requires a redesign of the compensation network, layout (due to higher switching frequency), and may increase BOM cost. If your application spends significant time in standby or low-power modes, the efficiency gain justifies the migration despite the LM2677SD-ADJ’s simplicity and lower component count.
Is the LM2677SD-ADJ suitable for battery-powered applications requiring low quiescent current, and how does its shutdown current compare to alternatives like the LM2678?
The LM2677SD-ADJ is not ideal for battery-powered applications due to its relatively high quiescent current (typically 2–5mA) and lack of an enable/shutdown pin, making it difficult to meet ultra-low power sleep mode requirements. In contrast, the LM2678 offers a shutdown mode with <10µA quiescent current, enabling significant battery life extension. If your design requires periodic sleep states or operation from small batteries (e.g., Li-ion or alkaline), consider migrating to a regulator with true shutdown capability. While the LM2677SD-ADJ can still be used with an external MOSFET to disconnect input power, this adds complexity and defeats the simplicity advantage of the SIMPLE SWITCHER® family.
Given that the LM2677SD-ADJ is marked 'Not For New Designs,' what are the recommended migration paths from Texas Instruments, and how do they affect long-term supply risk and design reuse?
Since the LM2677SD-ADJ is not recommended for new designs, TI recommends migrating to newer SIMPLE SWITCHER® alternatives like the LM2678 or LM5576, which offer improved efficiency, integrated features (e.g., soft-start, enable), and ongoing production support. The LM2678 provides pin-compatible drop-in replacement in many cases with similar external components, minimizing redesign effort. However, verify thermal performance and loop stability due to minor differences in control architecture. Continuing to design in the LM2677SD-ADJ introduces long-term supply chain risk, especially in automotive or medical applications requiring 10+ year availability. For new projects, adopting the LM2678 or TPS54560 reduces obsolescence risk and improves system reliability.
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LM2677SD-ADJ CAD Models
Texas Instruments LM2677SD-ADJ PCB symbols & footprints
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