MCP73827 Datasheet, PDF (1/20 Pages) Microchip Technology – Single Cell Lithium-Ion Charge Management Controller with Mode Indicator and Charge Current Monitor

MCP73827
Single Cell Lithium-Ion Charge Management Controller
with Mode Indicator and Charge Current 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 - MCP73827-4.1
- 4.2V - MCP73827-4.2
• Programmable Charge Current
• Automatic Cell Preconditioning of Deeply
Depleted Cells, Minimizing Heat Dissipation Dur-
ing Initial Charge Cycle
• Charge Status Output for LED Drive or Microcon-
troller Interface
• Charge Current Monitor Output
• 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
100 mΩ ^NDS8434
10 µF
332Ω
100 kΩ
76
V_SNS
8 _VIN
V_DRV
V_BAT ⁵
1 _{SHDN GND} 2
3 _{MODE IMON} 4
+ Single
Lithium-Ion
- _Cell
10 µF
MCP73827
Description
The MCP73827 is a linear charge management con-
troller for use in space-limited, cost sensitive applica-
tions. The MCP73827 combines high accuracy
constant voltage, controlled current regulation, cell pre-
conditioning, 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 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 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 estab-
lished 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.
Package Type
MSOP
SHDN 1
GND 2
MODE 3
I_MON 4
MCP73827
8 V_IN
7 V_SNS
6 V_DRV
5 V_BAT
© 2007 Microchip Technology Inc.
DS21704B-page 1