USB-Powered Li+ Charger

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The MAX1811 is a single-cell lithium-ion (Li+) battery charger that can be powered directly from a USB port or from an external supply up to 6.5V. It has a 0.5% overall battery regulation voltage accuracy to allow maximum utilization of the battery capacity.

The charger uses an internal FET to deliver up to 500mA charging current to the battery. The device can be configured for either a 4.1V or 4.2V battery, using the SELV input. The SELI input sets the charge current to either 100mA or 500mA. An open-drain output (active-low CHG) indicates charge status.

The MAX1811 has preconditioning that soft-starts a near-dead battery cell before charging. Other safety features include continuous monitoring of voltage and current and initial checking for fault conditions before charging.

The MAX1811 is available in a small 1.4W thermally enhanced 8-pin SO package.
MAX1811: Typical Operating Circuit MAX1811: Typical Operating Circuit Enlarge+

Key Features

  • Charges Single-Cell Li+ Batteries Directly from USB Port
  • 0.5% Overall Charging Accuracy
  • Minimal External Components
  • Input Diode Not Required
  • Automatic IC Thermal Regulation
  • Preconditions Near-Depleted Cells
  • Convenient Power SO-8 Package (1.4W)


  • Cell Phones
  • Digital Still Cameras
  • Handheld Computers
  • MP3 Players
  • PDAs and Palmtops
  • Two-Way Paging
Part NumberLithium Ion CellsProtected VIN
Charging VIN
Charge Rate Set byMax. ICHG
Charge TerminationCharge RegulationOper. Temp.
maxmaxSee Notes
MAX1811 16.56.5Logic Input0.5External ControlLinear-40 to +85
SOIC (N)/8
$1.80 @1k
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.

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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