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Texas Instruments LM2676SX-ADJ/NOPB

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Texas Instruments
TO-263-8, D²Pak (7 Leads + Tab), TO-263CA
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    LM2676SX-ADJ/NOPB informationLM2676SX-ADJ/NOPB information


    LM2676SX-ADJ/NOPB Typical application Circuitry Schematics


    The LM2676SX-ADJ/NOPB is a member of Texas Instruments' SIMPLE SWITCHER® family. This adjustable output voltage version can provide an output voltage from 1.2V to 37V with up to 3A output current, using an appropriate output adjustment setup. Here is a basic description of the connections within the typical application circuit: 

    1. Input Supply (Vin): The DC input supply is connected to this pin. The LM2676SX-ADJ/NOPB accepts a range of 8V to 40V. The pin should have a bypass capacitor to ground placed as close to it as possible, to filter out any high-frequency noise. 
    2. Switching Pin (SW): The LM2676SX-ADJ/NOPB switching pin is an output that alternates between the input voltage and ground. This high-frequency switching waveform is smoothed out with the help of an external inductor and capacitor to produce a steady DC output. 
    3. Feedback Pin (FB):This pin controls the output voltage by feedback. A resistor voltage divider from the output to ground is connected to the FB pin, and the regulator adjusts its output to maintain 1.23V at the FB pin. As a result, the output voltage can be adjusted to any value between 1.23V and 37V. 
    4. ON/OFF Pin: The regulator's operation is managed by this pin. A logic high enables the regulator, while a logic low shuts it down. You can connect this pin straight to Vin if you want the regulator to be on at all times. 
    5. Ground (GND): This is the ground or common return path for all circuits. To the system ground it ought to be linked. 
    6. Bootstrap (BST): The LM2676SX-ADJ/NOPB BST pin provides drive for the internal high-side power switch. It is connected to an external bootstrap capacitor and the SW pin. 
    The ratio of resistors R1 to R2 determines the regulator's output. If you choose R1 to be 1 kOhm, you can use the following formula to calculate R2 for your desired output voltage: 
    R2 = R1 * [(Vout / 1.23) - 1] 
    Make sure you also check the datasheet for additional application information and thermal considerations when using this regulator. Designing with the LM2676SX-ADJ/NOPB will also require careful attention to the PCB layout to ensure low noise and stable operation.


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