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LD3985M122R - STMicroelectronics

Description: LD3985M122R, Low Dropout Voltage Regulator, 0.55A, 1.22 V ±4%, 2.5 → 6 Vin, 5-Pin SOT-23

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LD3985M122R - STMicroelectronics PCB footprint - SOT23 (5-Pin) - SOT23 (5-Pin) - SOT23-5L-ren1
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LD3985M122R - STMicroelectronics  - 3D model - SOT23 (5-Pin) - SOT23-5L-ren1
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LD3985M122R Details

  • Manufacturer Part Number:

    LD3985M122R

  • Brand Name:

    STMicroelectronics

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SOT-23

  • Package Description:

    SOT-23, 5 PIN

  • Pin Count:

    5

  • Country Of Origin:

    Malaysia

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.60

  • Factory Lead Time:

    10 Weeks

  • Manufacturer:

    STMicroelectronics

  • YTEOL:

    7

  • Adjustability:

    FIXED

  • Dropout Voltage1-Max:

    0.1 V

  • Dropout Voltage1-Nom:

    0.06 V

  • Input Voltage Absolute-Max:

    6 V

  • Input Voltage-Max:

    6 V

  • Input Voltage-Min:

    2.5 V

  • JESD-30 Code:

    R-PDSO-G5

  • JESD-609 Code:

    e3

  • Length:

    2.9 mm

  • Line Regulation-Max:

    0.00427%

  • Load Regulation-Max:

    0.0145%

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    1

  • Number of Outputs:

    1

  • Number of Terminals:

    5

  • Operating Temperature TJ-Max:

    125 °C

  • Operating Temperature TJ-Min:

    -40 °C

  • Output Current1-Max:

    0.15 A

  • Output Voltage1-Max:

    1.295 V

  • Output Voltage1-Min:

    1.145 V

  • Output Voltage1-Nom:

    1.22 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    LSSOP

  • Package Equivalence Code:

    TSOP5/6,.11,37

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE, LOW PROFILE, SHRINK PITCH

  • Packing Method:

    TR

  • Peak Reflow Temperature (Cel):

    260

  • Qualification Status:

    Not Qualified

  • Regulator Type:

    FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR

  • Seated Height-Max:

    1.45 mm

  • Surface Mount:

    YES

  • Technology:

    BICMOS

  • Terminal Finish:

    Matte Tin (Sn) - annealed

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    0.95 mm

  • Terminal Position:

    DUAL

  • Time@Peak Reflow Temperature-Max (s):

    30

  • Voltage Tolerance-Max:

    6.15%

  • Width:

    1.625 mm

LD3985M122R Frequently Asked Questions (FAQs)

  • STMicroelectronics provides a recommended PCB layout in the application note AN4953, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
  • To ensure stability, it's essential to follow the recommended component values and PCB layout guidelines in the datasheet. Additionally, adding a small ceramic capacitor (e.g., 10nF) in parallel with the output capacitor can help to dampen oscillations.
  • While the datasheet doesn't specify a maximum input voltage ripple, a general rule of thumb is to keep the input voltage ripple below 1% of the input voltage to ensure reliable operation and minimize output voltage noise.
  • The LD3985M122R is rated for operation up to 125°C, but it's essential to consider the thermal derating curves in the datasheet to ensure the device can handle the expected power dissipation and ambient temperature in your specific application.
  • You can calculate the power dissipation using the formula Pd = (Vin - Vout) * Iout. Then, use the thermal resistance values in the datasheet to estimate the junction temperature. You can also use STMicroelectronics' online thermal calculator tool to simplify the process.

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LD3985M122R Overview

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About STMicroelectronics

STMicroelectronics (ST) is a global semiconductor company that designs, manufactures, and markets a broad range of integrated circuits (ICs), discrete devices, and other electronic components. STMicroelectronics offers a diverse portfolio of semiconductor products covering a wide range of applications and industries. Their product categories include microcontrollers, analog and mixed-signal ICs, MEMS (Micro-Electro-Mechanical Systems) sensors, power management ICs, RF (Radio Frequency) transceivers, aut

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