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Simple, Efficient, 1-Cell Li+ Pulse Charger

Product Details

Key Features

Parametric specs for Battery Chargers
Charging VIN (V) (max) 22
Max. ICHG (A) 2
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 22
Charger (V) 4 to 4.2
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/8
Budgetary
Price (See Notes)
1.66
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 22
Max. ICHG (A) 2
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 22
Charger (V) 4 to 4.2
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/8
Budgetary
Price (See Notes)
1.66

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

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.

Simplified Block Diagram

MAX1879: Typical Operating Circuit MAX1879: Typical Operating 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 .