MAX1879

Simple, Efficient, 1-Cell Li+ Pulse Charger


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Description

The MAX1879 single-cell lithium-ion (Li+) battery charger utilizes an efficient pulse-charging architecture to minimize power dissipation in portable devices. This architecture combines the efficiency of switch-mode chargers with the simplicity and low cost of linear chargers. This simple device, in conjunction with a current-limited wall cube and a PMOS transistor, allows safe and fast charging of a single Li+ cell.

The MAX1879 initiates charging in one of three ways: battery insertion, charger power-up, or toggling the THERM pin. Key safety features include continuous voltage and temperature monitoring, a preset charger time-out, and an 8mA precharge current mode to charge near-dead cells. Automatic detection of input power removal shuts down the device, minimizing current drain from the battery. An overall system accuracy of 0.75% ensures that the cell capacity is fully utilized without cycle life degradation.

The MAX1879 is offered in a space-saving 8-pin µMAX® package. An evaluation kit (MAX1879EVKIT) is available to help reduce design time.
MAX1879: Typical Operating Circuit MAX1879: Typical Operating Circuit Enlarge+

Key Features

  • Simple Design Minimizes Heat
  • Low Component Count, No Inductor
  • Battery-Full Indicator
  • 0.75% Accurate Battery Regulation
  • 1.5µA (max) Battery Current Drain with Wall Cube Removed
  • Restart Charging at 4.0V
  • Continuous Overvoltage and Overtemperature Protection
  • Safely Precharges Near-Dead Cells
  • Automatic Power-Down when Power Source is Removed
  • Charges 1 Cell from as Low as 4.5V
  • Pin-Compatible Upgrade to MAX1679

Applications/Uses

  • Cell Phones
  • Consumer Audio
  • Cordless Phones
  • Digital Still Cameras
  • Global Positioning Systems (GPS)
  • Pagers
  • Palmtops, Handy Terminals
  • Pen Entry Palmtops, PDAs and Organizers
  • Smart Battery Packs/Chargers
Part NumberLithium Ion CellsProtected VIN
(V)
Charging VIN
(V)
Charge Rate Set byMax. ICHG
(A)
Charge TerminationCharge RegulationOper. Temp.
(°C)
Package/PinsBudgetary
Price
maxmaxSee Notes
MAX1879 12222External Source2External ControlPulse-40 to +85
UMAX/8
$1.57 @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.


MAX1879EVKIT: Evaluation Kit for the MAX1879
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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