MCP73831 Datasheet, PDF (1/24 Pages) Microchip Technology – Miniature Single-Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controllers

MCP73831/2
Miniature Single-Cell, Fully Integrated Li-Ion,
Li-Polymer Charge Management Controllers
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
• Selectable Preconditioning
• Selectable End-of-Charge Control
• 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, SOT23
Applications:
• Lithium-Ion/Lithium-Polymer Battery Chargers
• Personal Data Assistants
• Cellular Telephones
• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• USB Chargers
Typical Application
V_IN
4.7 μF
500 mA Li-Ion Battery Charger
4 _VDD
V_BAT ³
4.7 μF
PROG ⁵
+ Single
-
Li-Ion
Cell
470Ω
1 _{STAT VSS} 2
MCP73831
2 kΩ
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, SOT23 package. Along with their small
physical size, the low number of external components
required make the MCP73831/2 ideally suited for por-
table 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, emerg-
ing battery charging requirements. The constant cur-
rent value is set with one external resistor. The
MCP73831/2 devices limit the charge current based
on die temperature 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 termi-
nation 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 dis-
abled. Refer to Section 1.0 “Electrical Characteris-
tics” for available options and the “Product
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
SOT23-5
STAT 1
V_SS 2
V_BAT 3
5 PROG
4 V_DD
8-Lead DFN
(2 mm x 3 mm)
V_{DD 1}
V_DD 2
V_BAT 3
V_BAT 4
8 PROG
7 NC
6 _VSS
5 STAT
© 2006 Microchip Technology Inc.
DS21984B-page 1