MCP73828 Datasheet, PDF (1/24 Pages) Microchip Technology – Single Cell Lithium-Ion Charge Management Controller with Charge Complete Indicator and Temperature Monitor

M
MCP73828
Single Cell Lithium-Ion Charge Management Controller
with Charge Complete Indicator and Temperature Monitor
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
Applications
• Single Cell Lithium-Ion Battery Chargers
• Personal Data Assistants
• Cellular Telephones
• Hand Held Instruments
• Cradle Chargers
• Digital Cameras
Typical Application Circuit
500 mA Lithium-Ion Battery Charger
MA2Q705
V_IN
5V
10 µF
100 mΩ ^NDS8434
332 Ω
100 kΩ
76
V_SNS V_DRV
8 _VIN
V_BAT ⁵
1 _{SHDN GND} 2
4 _{CD10 THERM} 3
MCP73828
Thermistor
+ _Single
- Lithium-Ion
Cell
10 µF
Description
The MCP73828 is a linear charge management con-
troller for use in space-limited, cost sensitive applica-
tions. The MCP73828 combines high accuracy
constant voltage, controlled current regulation, cell pre-
conditioning, 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 volt-
age. If the battery voltage is below the internal low-volt-
age 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 estab-
lished 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 dimin-
ished 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.
Package Type
MSOP
SHDN 1
GND 2
THERM 3
CD10 4
MCP73828
8 VIN
7 V_SNS
6 V_DRV
5 V_BAT
 2002 Microchip Technology Inc.
DS21706A-page 1