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High-Frequency, Low-Cost SMBus Battery Chargers

Low-Cost SMBus Chargers Deliver Up to 7A Charge Current

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Low-Cost SMBus Charger
  • High Switching Frequency (0.85MHz, 0.5MHz)
  • Internal Boost Switches
  • SMBus-Programmable Charge Voltage, Input Current Limit, Charge Current, Relearn Voltage, and Digital IINP Readback
  • Single-Point Compensation
  • Automatic Selection of System Power Source
    • Adapter n-channel MOSFETs Driven by an Internal Dedicated Charge Pump
    • Adapter Soft-Start
  • ±0.4% Accurate Charge Voltage
  • ±2.5% Accurate Input Current Limiting
  • ±3% Accurate Charge Current
  • Monitor Outputs for
    • AC Adapter Current (±2% Accuracy)
    • Battery Discharge Current (±2% Accuracy)
    • AC Adapter Presence
  • AC Adapter Overvoltage Protection
  • 11-Bit Battery Voltage Setting
  • 6-Bit, Charge-Current Setting/Input Current Setting
  • Improved IINP Accuracy at Low Input Current

Applications/Uses

  • 2- to 4-Li+ Cell Battery-Powered Devices
  • Notebook Computers
  • PDAs and Mobile Communicators

Description

The MAX17435/MAX17535 integrated multichemistry battery chargers IC simplify construction of accurate and efficient chargers. The MAX17435/MAX17535 provide SMBus™-programmable charge current, charge voltage, input current limit, relearn voltage, and digital readback of the IINP voltage. The MAX17435/MAX17535 utilize a charge pump to control the adapter selection n-channel MOSFETs when the adapter is present. When the adapter is absent, the charge pump is shut down and a p-channel MOSFET selects the battery.

The MAX17435/MAX17535 provide up to 7A of charge current to 2, 3, or 4 lithium-ion (Li+) cells in series. The charge current, and input current-limit sense amplifiers have low offset errors and can use 10mΩ sense resistors. The MAX17435/MAX17535 fixed-inductor ripple architecture significantly reduces component size and circuit cost.

The MAX17435/MAX17535 provide a digital output that indicates the presence of the adapter, an analog output that indicates the adapter or battery current, depending upon the presence or absence of the adapter, and a digital output that indicates when the adapter current exceeds a user-defined threshold.

The MAX17435 switches at 850kHz, and the MAX17535 switches at 500kHz.

The MAX17435/MAX17535 are available in a small, 4mm x 4mm x 0.75mm 24-pin, lead-free QFN package. An evaluation kit is available.

Simplified Block Diagram

MAX17035, MAX17435, MAX17535: Standard Application Circuit MAX17035, MAX17435, MAX17535: Standard Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .