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IW3637-03A - Renesas Electronics

Description: The iW3637 high-voltage, second-stage buck LED driver provides constant current to LEDs directly from DC power supplies. It supports non-isolated buck and flyback converter topologies to post-regulate from a PFC AC/DC boost converter, minimizing low frequency output ripple current and eliminating virtually all flicker in the system, even down to 1%. A wide range of DC input voltages simplifies design by enabling the use of just one second-stage driver across any commercial lighting product portfolio.

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IW3637-03A - Renesas Electronics - PCB symbol
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IW3637-03A - Renesas Electronics PCB footprint - Small Outline Packages - Small Outline Packages - 8 LEAd soic-ren1
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IW3637-03A - Renesas Electronics - 3D model - Small Outline Packages - 8 LEAd soic-ren1
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IW3637-03A Details

  • Manufacturer Part Number:

    IW3637-03A

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Package Description:

    SOIC-8

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.60

  • Factory Lead Time:

    18 Weeks

  • Manufacturer:

    Renesas Electronics Corporation

  • YTEOL:

    7.89

  • Data Input Mode:

    SERIAL

  • Input Characteristics:

    STANDARD

  • Interface IC Type:

    LED DISPLAY DRIVER

  • JESD-30 Code:

    R-PDSO-G8

  • Length:

    4.9 mm

  • Moisture Sensitivity Level:

    1

  • Multiplexed Display Capability:

    NO

  • Number of Functions:

    1

  • Number of Segments:

    3

  • Number of Terminals:

    8

  • Operating Temperature-Max:

    150 °C

  • Operating Temperature-Min:

    -40 °C

  • Output Characteristics:

    CONSTANT-CURRENT

  • Output Polarity:

    TRUE

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP8,.25

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE

  • Seated Height-Max:

    1.75 mm

  • Supply Current-Max:

    20 mA

  • Supply Voltage-Max:

    30 V

  • Supply Voltage-Min:

    7.5 V

  • Surface Mount:

    YES

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    1.27 mm

  • Terminal Position:

    DUAL

  • Width:

    3.865 mm

  • fmax-Min:

    0.09 MHz

IW3637-03A Frequently Asked Questions (FAQs)

  • Renesas provides a recommended PCB layout guide in their application note (R01AN4393EJ0100) which includes thermal vias, copper pours, and component placement guidelines to ensure optimal thermal performance.
  • The IW3637-03A has a built-in overcurrent protection feature. To implement it, connect the OCP pin to a resistor divider network that sets the overcurrent threshold. The datasheet provides a calculation formula to determine the resistor values.
  • Renesas recommends using a low-ESR ceramic capacitor (X5R or X7R dielectric) with a value of 4.7uF to 10uF for the input capacitor. This ensures stable operation and minimizes voltage ripple.
  • The output voltage can be adjusted by connecting a resistor divider network between the VOUT pin and the GND pin. The datasheet provides a formula to calculate the resistor values for the desired output voltage.
  • While the datasheet specifies an operating temperature range of -40°C to 105°C, Renesas recommends keeping the ambient temperature below 85°C for reliable long-term operation.

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IW3637-03A Overview

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