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MCP73831-3ACI/OT bảng dữ liệu(PDF) 1 Page - Microchip Technology

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Giải thích chi tiết về linh kiện  Miniature Single-Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controllers
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© 2008 Microchip Technology Inc.
DS21984E-page 1
MCP73831/2
Features
• Linear Charge Management Controller:
- Integrated Pass Transistor
- Integrated Current Sense
- Reverse Discharge Protection
• High Accuracy Preset Voltage Regulation: + 0.75%
• Four Voltage Regulation Options:
- 4.20V, 4.35V, 4.40V, 4.50V
• Programmable Charge Current: 15 mA to 500 mA
• Selectable Preconditioning:
- 10%, 20%, 40%, or Disable
• Selectable End-of-Charge Control:
- 5%, 7.5%, 10%, or 20%
• Charge Status Output
- Tri-State Output - MCP73831
- Open-Drain Output - MCP73832
• Automatic Power-Down
• Thermal Regulation
• Temperature Range: -40°C to +85°C
• Packaging:
- 8-Lead, 2 mm x 3 mm DFN
- 5-Lead, SOT-23
Applications
• Lithium-Ion/Lithium-Polymer Battery Chargers
• Personal Data Assistants
• Cellular Telephones
• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• USB Chargers
Typical Application
Description:
The MCP73831/2 devices are highly advanced linear
charge management controllers for use in space-lim-
ited, cost-sensitive applications. The MCP73831/2 are
available in an 8-Lead, 2 mm x 3 mm DFN package or
a 5-Lead, SOT-23 package. Along with their small
physical size, the low number of external components
required make the MCP73831/2 ideally suited for
portable applications. For applications charging from a
USB port, the MCP73831/2 adhere to all the
specifications governing the USB power bus.
The MCP73831/2 employ a constant-current/constant-
voltage charge algorithm with selectable precondition-
ing and charge termination. The constant voltage
regulation is fixed with four available options: 4.20V,
4.35V, 4.40V or 4.50V, to accommodate new, emerging
battery charging requirements. The constant current
value is set with one external resistor. The MCP73831/
2 devices limit the charge current based on die temper-
ature during high power or high ambient conditions.
This thermal regulation optimizes the charge cycle time
while maintaining device reliability.
Several options are available for the preconditioning
threshold,
preconditioning
current
value,
charge
termination value and automatic recharge threshold.
The preconditioning value and charge termination
value are set as a ratio, or percentage, of the
programmed constant current value. Preconditioning
can be disabled. Refer to
Section 1.0 “Electrical
Characteristics” for available options and the “Prod-
uct Identification System” for standard options.
The MCP73831/2 devices are fully specified over the
ambient temperature range of -40°C to +85°C.
Package Types
STAT
VDD
VSS
PROG
VBAT
+
-
Single
Li-Ion
Cell
4
MCP73831
5
3
1
500 mA Li-Ion Battery Charger
2
VIN
4.7
μF
470
Ω
2k
Ω
4.7
μF
VBAT
VSS
VDD
1
2
3
5
4
PROG
STAT
MCP73831/2
2×3 DFN*
VBAT
VDD
VBAT
NC
VSS
1
2
3
4
8
7
6
5 STAT
PROG
VDD
* Includes Exposed Thermal Pad (EP); see Table 3-1.
EP
9
MCP73831/2
SOT-23-5
Miniature Single-Cell, Fully Integrated Li-Ion,
Li-Polymer Charge Management Controllers


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