MCP73827

• Linear Charge Management Controller for Single Lithium-Ion Cells
• High Accuracy Preset Voltage Regulation: + 1% (max)
• Two Preset Voltage Regulation Options:
- 4.1V - MCP73827-4.1
- 4.2V - MCP73827-4.2
• Programmable Charge Current
• Automatic Cell Preconditioning of Deeply Depleted Cells, Minimizing Heat Dissipation During Initial Charge Cycle
• Charge Status Output for LED Drive or Microcontroller Interface
• Charge Current Monitor Output
• Automatic Power-Down when Input Power Removed
• Temperature Range: -20°C to +85°C
• Packaging: 8-Pin MSOP

Maximum Ratings*
V_IN.................................................................... -0.3V to 6.0V
All inputs and outputs w.r.t. GND ..............-0.3 to (V_IN+0.3)V
Current at MODE Pin ............................................. +/-30 mA
Current at V_DRV........................................................ +/-1 mA
Maximum Junction Temperature, T_J............................ 150°C
Storage temperature ...............................-65°C to +150°C
ESD protection on all pins............................................ 4 kV

*Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

The MCP73827 is a linear charge management controller for use in space-limited, cost sensitive applications. The MCP73827 combines high accuracy constant voltage, controlled current regulation, cell preconditioning, and charge status indication in a space saving 8-pin MSOP package. The MCP73827 provides a stand-alone charge management solution.

The MCP73827 charges the battery in three phases: preconditioning, controlled current, and constant voltage. If the battery voltage is below the internal low-voltage threshold, the battery is preconditioned with a foldback current. The preconditioning phase protects the lithium-ion cell and minimizes heat dissipation.

Following the preconditioning phase, the MCP73827 enters the controlled current phase. The MCP73827 allows for design flexibility with a programmable charge current set by an external sense resistor. The charge current is ramped up, based on the cell voltage, from the foldback current to the peak charge current established by the sense resistor. This phase is maintained until the battery reaches the charge-regulation voltage.

Then, the MCP73827 enters the final phase, constant voltage. The accuracy of the voltage regulation is better than +1% over the entire operating temperature range and supply voltage range. The MCP73827-4.1 is preset to a regulation voltage of 4.1V, while the MCP73827-4.2 is preset to 4.2V. The charge status output, MODE, indicates when the charge cycle has transitioned to constant voltage mode. The charge cycle can be terminated by a timer that is started when the MODE pin goes to a logic High or by monitoring the charge current monitor output, I_MON, for a minimum current.

The MCP73827 operates with an input voltage range from 4.5V to 5.5V. The MCP73827 is fully specified over the ambient temperature range of -20°C to +85°C.