Chemistry-Independent Battery Chargers

SBS Level 2 Smart Battery Charger with SMBus Interface

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The MAX1647/MAX1648 provide the power control necessary to charge batteries of any chemistry. In the MAX1647, all charging functions are controlled through the Intel® System Management Bus (SMBus™) interface. The SMBus 2-wire serial interface sets the charge voltage and current, and provides thermal status information. The MAX1647 functions as a level 2 charger, compliant with the Duracell®/Intel Smart Battery Charger Specification. The MAX1648 omits the SMBus serial interface, and instead sets the charge voltage and current proportional to the voltage applied to external control pins.

In addition to the feature set required for a level 2 charger, the MAX1647 generates interrupts to signal the host when power is applied to the charger or a battery is installed or removed. Additional status bits allow the host to check whether the charger has enough input voltage, and whether the voltage on or current into the battery is being regulated. This allows the host to determine when lithium-ion batteries have completed charge without interrogating the battery.

The MAX1647 is available in a 20-pin SSOP with a 2mm profile height. The MAX1648 is available in a 16-pin SO package.
MAX1647, MAX1648: Pin Configurations MAX1647, MAX1648: Pin Configurations Enlarge+

Key Features

  • Charges Any Battery Chemistry: Li-Ion, NiCd, NiMH, Lead Acid, etc.
  • Intel SMBus 2-Wire Serial Interface (MAX1647)
  • Intel/Duracell Level 2 Smart Battery Compliant (MAX1647)
  • 4A, 2A, or 1A Maximum Battery-Charge Current
  • 11-Bit Control of Charge Current
  • Up to 18V Battery Voltage
  • 10-Bit Control of Voltage
  • ±0.75% Voltage Accuracy with External ±0.1% Reference
  • Up to 28V Input Voltage
  • Battery Thermistor Fail-Safe Protection


  • Charger Base Stations
  • Notebook Computers
  • PDAs and Other Handheld Devices
  • Phones
Part NumberLithium Ion CellsProtected VIN
Charging VIN
Charge Rate Set byMax. ICHG
Charge TerminationCharge RegulationOper. Temp.
External Control
Smart Battery Control
Switchmode-40 to +85
See All Battery Chargers (74)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 676 New Developments in Battery Chargers
App Note 666 Versatile ICs Enable Chemistry-Independent Battery Charging

Quality and Environmental Data

Product Reliability Reports: MAX1647.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • Lithium Ion Charger
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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