Microchip Technology Inc

LR8

In Production

LR8 is a high voltage, low output current, adjustable linear regulator. It has a wide operating input voltage range of 13.2 - 450V. The output voltage can be adjusted from 1.20 - 440V provided that the input voltage is at least 12V greater than the output voltage. The output voltage can be adjusted by means of two external resistors R1 and R2 as shown in the typical application circuits. The LR8 regulates the voltage difference between VOUT and ADJ pins to a nominal value of 1.20V. The 1.20V is amplified by the external resistor ratio R1 and R2. An internal constant bias current of typically 10µA is connected to the ADJ pin. This increases VOUT by a constant voltage of 10µA times R2. The LR8 has current limiting and temperature limiting. The output current limit is typically 20mA and the minimum temperature limit is 125°C. An output short circuit current will therefore be limited to 20mA. When the junction temperature reaches its temperature limit, the output current and/or output voltage will decrease to keep the junction temperature from exceeding its temperature limit. For SMPS start-up circuit applications, the LR8 turns off when an external voltage greater than the output voltage of the LR8 is applied to VOUT of the LR8. To maintain stability, a bypass capacitor of 1.0µF or larger and a minimum DC output current of 500µA are required. The device is available in TO-243AA (SOT-89), TO-252 (D-PAK), and TO-92 packages.

 

    Features

      • 13.2 - 450V input voltage range
      • Adjustable 1.20 - 440V output regulation
      • 5% output voltage tolerance
      • Output current limiting
      • 10µA typical ADJ current
      • Internal junction temperature limiting
    Parameter Name
    Value
    +Vin min (V)
    13.2
    +Vin max (V)
    450
    Vout min (V)
    1.2
    Vout max (V)
    440
    Output Current (mA)
    10
    Dimming
    N/A
    Parallelable
    N/A
    Package
    SOT-89, TO-92, TO-252
    Features
    Adj. Output, Overcurrent Limiting, OTP
    Documentation
    Data Sheets
    11/07/2017
    804KB
      Application Notes
     
     
     
     
    AppNote
    06/19/2014
    656KB
      Software Library
     
     
     
     
    Software Library
    10/16/2017
      Product Document
     
     
     
     
    Product Document
    12/19/2014
    1165KB
    Pricing & Samples
    All pricing shown in USD only.
    Part Number
    Leads
    Package Type
    Temp Range
    Packing
    1+
    26+
    100+
    1000+
    5000+
    Buy
    Sample
    LR8K4-G
    3
    DPAK
    -40C to +125C
    T/R
    0.93
    0.78
    0.71
    0.68
    0.67
    LR8N3-G
    3
    TO-92
    -40C to +125C
    BAG
    0.59
    0.49
    0.45
    0.43
    0.43
    LR8N3-G-P003
    3
    TO-92
    -40C to +125C
    T/R
    0.64
    0.53
    0.48
    0.47
    0.46
     
    LR8N8-G
    3
    SOT-89
    -40C to +125C
    T/R
    0.62
    0.52
    0.47
    0.46
    0.45

    ** Device not available to purchase online. Please contact a sales office for pricing information.
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    RoHS Information
    Part
    Number
    Device
    Weight
    Shipping
    Weight
    Lead
    Count
    Package
    Type
    Package
    Width
    Solder
    Composition
    JEDEC
    Indicator
    RoHS
     
    China
    EFUP
    LR8N3-G
    0.203400
    0.219000
    3
    TO-92
    -
    Matte Tin
    e3
    LR8N3-G-P003
    0.203400
    0.515000
    3
    TO-92
    -
    Matte Tin
    e3
    LR8N8-G
    0.051800
    0.132000
    3
    SOT-89
    -
    Matte Tin
    e3
    LR8K4-G
    1.420000
    0.501000
    3
    DPAK
    -
    Matte Tin
    e3
    To see a complete listing of RoHS data for this device, please Click here
    Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.