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DO3316T-473MLB Datasheet – 47 µH, SMT Power Inductor ( PDF )

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Part Number: DO3316T-473MLB

Function: 47 µH, High Temp Power Inductor

Manufacturer: Coilcraft Inc

Images:

DO3316T-473MLB datasheet

Description

DO3316T-473MLB is a high-temperature, shielded ferrite power inductor designed for automotive and high-reliability power applications. It offers low DC resistance (DCR), high current handling capability, and stable inductance under elevated temperature conditions, making it suitable for DC/DC converters and power management circuits.

Features

  • Inductance: 47 µH (±10% tolerance typical)
  • Designed for high-temperature operation (up to 125°C ambient)
  • AEC-Q200 Grade 1 qualified (–40°C to +125°C)
  • Low DC resistance (DCR) for improved efficiency
  • High RMS current handling capability
  • Shielded construction (reduced EMI)
  • Soldered self-leaded design for robust mounting
  • RoHS compliant (Sn-Ag-Cu termination)

Mechanical / Material Characteristics

  • Core material: Ferrite
  • Construction: Molded / shielded power inductor
  • Weight: 0.95 ~ 1.25 g
  • Excellent solderability and mechanical reliability

Electrical Characteristics (Typical)

  • Inductance (L): 47 µH
  • Tolerance: ±10%
  • Low DCR → reduces conduction losses
  • High saturation current (Isat) → prevents inductance drop under load

Design Notes

  • Verify both IRMS (thermal limit) and Isat (magnetic saturation limit)
  • Ferrite core → low core loss at high frequency but saturation-sensitive
  • Place close to switching node to minimize loop area and EMI
  • Consider temperature derating for automotive environments
  • Shielded structure helps reduce radiated EMI in dense layouts

Typical Applications

  • Automotive DC/DC converters
  • Switch-mode power supplies (SMPS)
  • Power management for industrial electronics
  • LED drivers and battery-powered systems
  • Point-of-load (POL) converters

How to Choose This Inductor

  • Select inductance value based on switching frequency and ripple current
  • Ensure IRMS rating exceeds load current
  • Ensure Isat exceeds peak inductor current
  • Evaluate DCR for efficiency-sensitive designs
  • Confirm thermal margin under worst-case ambient conditions

Other data sheets are available within the file:

DO3316T, DO3316T-102MLB, DO3316T-102MLD,

DO3316T-103MLB, DO3316T-103MLD

DO3316T-473MLB Datasheet PDF Download


DO3316T-473MLB pdf

BQ24728 Datasheet – Battery SMBus Charge Controller – TI

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Part Number: BQ24728, BQ728, BQ24728RGRT

Function: Battery SMBus Charge Controller ( Power management , System Charge Power IC )

Package: QFN 20 Pin

Manfacturers: Texas Instruments

Image:

BQ24728 image

Description

The bq24728 is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications. The device uses two charge pumps to  separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection. SMBus controlled input current, charge current, and charge voltage DACs allow for high regulation accuracies that can be programmed by the system power management micro-controller.

Features

  • SMBus programmable charging parameters (voltage/current/input limit)
  • High-efficiency synchronous charging architecture
  • Automatic power source selection (adapter ↔ battery)
  • Supports multi-chemistry battery systems (primarily Li-ion/Li-polymer)
  • Low external component count
  • High regulation accuracy via internal DACs
  • Dual charge pump for full NMOS drive (no P-channel needed)

Pinout

BQ24728 Datasheet, Pinout

Typical Circuit Usage

  • Adapter input → ACFET/RBFET → system rail
  • Synchronous buck stage → battery charging path
  • BATFET controls battery connection/disconnection
  • SMBus connected to EC (Embedded Controller)

Design Notes (Critical Points)

  • Accurate current sensing resistor selection is essential for charge precision
  • External MOSFET selection impacts efficiency and thermal performance
  • SMBus firmware must properly configure charging profiles
  • PCB layout must minimize switching loop inductance
  • Thermal design critical for high-current charging scenarios

Applications

  • Notebook / ultrabook / netbook platforms
  • Handheld and portable terminals
  • Industrial battery-powered equipment
  • Medical portable systems
  • Embedded battery charging modules

Advantages

  • Highly flexible and programmable
  • Efficient power-path control
  • Reduced component count
  • Suitable for smart battery systems

Alternative / Equivalent Products

  • BQ24727 (closely related variant)
  • BQ24725A
  • ISL6255
  • MAX8734
  • LTC4012

BQ24728 Datasheet

BQ24728 pdf

BQ24725 Datasheet

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