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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsLM3676SD-ADJ
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LM3676SD-ADJ - Texas Instruments

Manufacturer Part Number
LM3676SD-ADJ
Manufacturer
Texas Instruments
Allelco Part Number
98D-LM3676SD-ADJ
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
11,264 pcs available, New & Original
Parts Description
IC REG BUCK ADJ 600MA 8WSON
Package
8-WSON (3x3)
Data sheet
LM3676SD-ADJ.pdf

HTML Datasheet

LM3676.pdf
RoHs Status
 
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Specifications

LM3676SD-ADJ Tech Specifications
Texas Instruments - LM3676SD-ADJ technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM3676SD-ADJ

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Output (Min/Fixed) 1.1V
Voltage - Output (Max) 3.3V
Voltage - Input (Min) 2.9V
Voltage - Input (Max) 5.5V
Topology Buck
Synchronous Rectifier Yes
Supplier Device Package 8-WSON (3x3)
Series -
Package / Case 8-WFDFN Exposed Pad
Product Attribute Attribute Value
Package Tape & Reel (TR)
Output Type Adjustable
Output Configuration Positive
Operating Temperature -30°C ~ 85°C (TA)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching 2MHz
Current - Output 600mA
Base Product Number LM3676

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

How does the LM3676SD-ADJ handle thermal performance under continuous 600mA load, and what PCB layout considerations are critical for maintaining junction temperature within safe limits?
Under sustained 600mA output current, the LM3676SD-ADJ dissipates approximately 0.4W of power in typical buck configurations with a 5V input and 1.8V output. With an exposed pad package providing enhanced thermal conduction, the device can operate reliably up to 85°C ambient without active cooling, assuming proper copper pour and via stitching on the PCB. However, thermal resistance from junction to ambient (θJA) increases significantly without adequate heat spreading. Engineers should allocate at least 2 cm² of internal layer copper connected through multiple thermal vias to the exposed pad, especially when operating near maximum current or in compact form factors.
Can the LM3676SD-ADJ be used in battery-powered applications requiring stable operation down to 2.9V input, and how does efficiency vary across the adjustable voltage range?
Yes, the LM3676SD-ADJ supports operation directly from single-cell Li-ion batteries as low as 2.9V, making it suitable for portable devices. Efficiency remains above 85% from 3.3V down to 1.8V output with a 3.7V input, but drops below 80% at 1.1V due to increased switching losses relative to output power. The 2MHz switching frequency minimizes inductor size while maintaining good efficiency across the adjustable range, though output ripple increases slightly at lower voltages due to reduced duty cycle headroom.
What are the key differences between using fixed versus adjustable output versions of the LM3676 family, and when would one choose the LM3676SD-ADJ over a fixed-output variant?
Fixed-output versions like the LM3676MF-18/NOPB provide pre-configured outputs such as 1.8V or 3.3V, eliminating external feedback resistors and simplifying design. The LM3676SD-ADJ offers flexibility by allowing any output between 1.1V and 3.3V using standard resistors, which is advantageous when prototyping multiple voltage rails or adapting to evolving system requirements. While fixed versions may offer marginally better efficiency and smaller bill of materials, the adjustable version reduces inventory complexity for designs that might need minor voltage tweaks during validation.
Is synchronous rectification in the LM3676SD-ADJ essential for high-efficiency applications, and how does it impact component selection compared to asynchronous regulators?
Synchronous rectification is highly beneficial for the LM3676SD-ADJ, particularly at higher input-to-output differentials. By replacing the body-diode of an external Schottky with a low-RDS(on) MOSFET internal to the controller, conduction losses drop significantly—typically improving efficiency by 8–12 percentage points at 600mA load. This reduces both power dissipation and output ripple, allowing use of smaller inductors and capacitors. For space-constrained designs where efficiency must exceed 85%, synchronous operation justifies the minimal cost premium over asynchronous alternatives.
How should output capacitor selection differ between ceramic and tantalum types when designing with the LM3676SD-ADJ, and what stability implications arise?
Ceramic capacitors are strongly recommended for the LM3676SD-ADJ due to their low ESR and compatibility with the 2MHz switching frequency. Tantalum capacitors exhibit higher and nonlinear ESR that can destabilize the control loop unless carefully compensated, often requiring additional feedforward capacitance or series resistance—increasing board area and cost. The regulator’s internal compensation network assumes ceramic-like behavior; therefore, using non-ceramic capacitors risks oscillation or poor transient response, especially at light loads or elevated temperatures.
Can the LM3676SD-ADJ drive multiple parallel loads without derating, and what precautions are necessary if extending its output beyond 600mA?
The LM3676SD-ADJ is rated for continuous 600mA output, and exceeding this current will increase junction temperature and reduce reliability. Parallel operation is not supported because current sharing between regulators is inherently unbalanced due to part-to-part variation in threshold voltages and gate drives. If higher current is required, designers must either accept derated operation with reduced duty cycle (e.g., 400mA max in hot environments) or select a higher-current buck IC such as the LM3671. For intermittent peaks above 600mA lasting less than 1ms, output capacitance can buffer demand, but steady-state overload violates absolute maximum ratings.
What impact does input voltage ripple have on the LM3676SD-ADJ’s stability, and how far upstream filtering should be implemented?
Input voltage ripple above 100mV peak-to-peak can affect the error amplifier reference and cause audible noise or instability, particularly near minimum input of 2.9V. A simple LC filter with 1µH inductor and 22µF ceramic capacitor placed within 10mm of the VIN pin typically suffices to dampen switching feedthrough. Additionally, placing a 10µF bulk capacitor close to the device helps maintain sufficient charge during transient load steps. Without adequate input filtering, the regulator may oscillate or exhibit excessive output droop under dynamic conditions.
How does the 2MHz switching frequency influence EMI characteristics and PCB routing compared to lower-frequency buck converters?
The 2MHz switching frequency of the LM3676SD-ADJ pushes emissions into the RF spectrum, reducing interference with sensitive analog circuits operating below 500kHz. However, it demands tighter control of high-dielectric-constant loops to minimize conducted emissions. Critical paths—input capacitor return, SW node, and output capacitor ground—must be kept short and wide. Routing traces perpendicular to adjacent signal layers and avoiding split planes beneath the IC improves EMI performance. While easier to filter than sub-500kHz switchers, the high frequency necessitates careful decoupling and layout discipline to pass FCC/CE compliance.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LM3676SD-ADJ

Product Attribute LM3676SD-ADJ/NOPB LM3676SDX-ADJ LM3676SD-1.5 LM3674MFX-ADJ
Part Number LM3676SD-ADJ/NOPB LM3676SDX-ADJ LM3676SD-1.5 LM3674MFX-ADJ
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Frequency - Switching - - - -
Voltage - Output (Max) - - - -
Function - - - -
Output Configuration - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Voltage - Input (Min) - - - -
Number of Outputs - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Topology - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Synchronous Rectifier - - - -
Voltage - Input (Max) - - - -
Series - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Current - Output - - - -
Voltage - Output (Min/Fixed) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

LM3676SD-ADJ Datasheet PDF

Download LM3676SD-ADJ pdf datasheets and Texas Instruments documentation for LM3676SD-ADJ - Texas Instruments.

HTML Datasheet
LM3676.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

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LM3676SD-ADJ Image

LM3676SD-ADJ

Texas Instruments
98D-LM3676SD-ADJ

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