Battery

SMB358 PDF Datasheet – Battery Charger IC

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SMB358 is a programmable single-cell Li-ion / Li-poly battery charger IC capable of both charging the battery and powering the system from a USB or AC input. It supports relatively high charge currents (e.g. up to 1.5 A or more depending on variant) with built-in regulation, protection, and monitoring features.

Function: Battery Charger IC

Package: BGA 30 Pin Ball Type

Manufacturer: Samsung, Qualcomm

See the preview image and the PDF file for more information.

Images:

SMB358 PDF Datasheet

Description

SMB358 is a single-cell battery charger. It can charge the battery and power the system via the USB/AC adapter input.

The devices are programmable single-cell lithium-ion/lithium-polymer battery chargers designed for a variety of portable applications. The device provides a simple and efficient way to charge high-capacity Li-ion batteries and power the system via a USB or AC adapter input.

 

Pinout

SMB358 pinout Battery Charger

Features

1. Efficiency: up to 88% at 2A charge current

2. Input voltage range: 3.7V to 6.2V

3. Maximum input current of 2A

4. Maximum charge current of 2A

5. CurrentPath control with an integrated 40 mΩ battery FET for the highest charging and discharging efficiency and extended battery life

6. Autonomous, HW-based USB BC1.2, Quick Charge 1.0 support

7. I2C communications interface

SMB358 Datasheet

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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