MCP73828

Features:

• Linear Charge Management Controller for Single Lithium-Ion Cells
• High Accuracy Preset Voltage Regulation:+1% (max)
• Two Preset Voltage Regulation Options:
- 4.1V - MCP73828-4.1
- 4.2V - MCP73828-4.2
• Programmable Charge Current
• Automatic Cell Preconditioning of Deeply Depleted Cells, Minimizing Heat Dissipation During Initial Charge Cycle
• Charge Complete Output CD10 for LED or Microcontroller Interface
• Continuous Temperature Monitoring
• Automatic Power-Down when Input Power Removed
• Temperature Range: -20°C to +85°C
• Packaging: 8-Pin MSOP





Application

• Single Cell Lithium-Ion Battery Chargers
• Personal Data Assistants
• Cellular Telephones
• Hand Held Instruments
• Cradle Chargers
• Digital Cameras




Pinout






Specifications

Parameter Name	Value
Max Voltage Regulation (%)	±1
Linear Mode	Yes
# of Cells	1
Int/Ext FET	Ext
Vcc Range (V)	4.5 to 5.5
Voltage Regulation Accuracy (%)	1
Temperature Monitor	Yes
Charge Safety Timers	No
Max Thermal Regulation	No

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 CD10 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




Description

The MCP73828 is a battery charger controller for single cell Lithium-Ion (Li-Ion) batteries. Using an external PMOS transistor, safe and fast charging of a single Li-Ion cell is accomplished. Features include, over-current foldback, charge complete output, and continuous temperature monitor. An overall system accuracy of 1% ensures that the cell capacity is fully utilized without cycle life degradation. An external resistor can set charge current.
The MCP73828 operates with an input voltage range from 4.5V to 5.5V. It is specified over the ambient operating temperature range of -20°C to +85°C and is available in a small 8-Pin MSOP.

The MCP73828 is a linear charge management controller for use in space-limited, cost sensitive applications.The MCP73828 combines high accuracy constant voltage, controlled current regulation, cell preconditioning,cell temperature monitoring, and charge complete indication in a space saving 8-pin MSOP package. The MCP73828 provides a stand-alone charge management solution.

The MCP73828 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 MCP73828 enters the controlled current phase. The MCP73828 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 MCP73828 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 MCP73828-4.1 is preset to a regulation voltage of 4.1V, while the MCP73828-4.2 is preset to 4.2V. The charge complete output,CD10, indicates when the charge current has diminished to approximately 10% of the peak charge current established by the sense resistor.

The MCP73828 operates with an input voltage range from 4.5V to 5.5V. The MCP73828 is fully specified over the ambient temperature range of -20°C to +85°C.