MCP73831/2
Miniature Single-Cell, Fully Integrated Li-Ion,
Li-Polymer Charge Management Controllers
Features Description:
Linear Charge Management Controller: The MCP73831/2 devices are highly advanced linear
charge management controllers for use in space-lim-
- Integrated Pass Transistor
ited, cost-sensitive applications. The MCP73831/2 are
- Integrated Current Sense
available in an 8-Lead, 2 mm x 3 mm DFN package or
- Reverse Discharge Protection
a 5-Lead, SOT-23 package. Along with their small
High Accuracy Preset Voltage Regulation: + 0.75%
physical size, the low number of external components
Four Voltage Regulation Options:
required make the MCP73831/2 ideally suited for
portable applications. For applications charging from a
- 4.20V, 4.35V, 4.40V, 4.50V
USB port, the MCP73831/2 adhere to all the
Programmable Charge Current: 15 mA to 500 mA
specifications governing the USB power bus.
Selectable Preconditioning:
The MCP73831/2 employ a constant-current/constant-
- 10%, 20%, 40%, or Disable
voltage charge algorithm with selectable precondition-
Selectable End-of-Charge Control:
ing and charge termination. The constant voltage
- 5%, 7.5%, 10%, or 20%
regulation is fixed with four available options: 4.20V,
Charge Status Output
4.35V, 4.40V or 4.50V, to accommodate new, emerging
- Tri-State Output - MCP73831 battery charging requirements. The constant current
value is set with one external resistor. The MCP73831/
- Open-Drain Output - MCP73832
2 devices limit the charge current based on die temper-
Automatic Power-Down
ature during high power or high ambient conditions.
Thermal Regulation
This thermal regulation optimizes the charge cycle time
Temperature Range: -40C to +85C
while maintaining device reliability.
Packaging:
Several options are available for the preconditioning
- 8-Lead, 2 mm x 3 mm DFN
threshold, preconditioning current value, charge
- 5-Lead, SOT-23
termination value and automatic recharge threshold.
The preconditioning value and charge termination
Applications
value are set as a ratio, or percentage, of the
programmed constant current value. Preconditioning
Lithium-Ion/Lithium-Polymer Battery Chargers
can be disabled. Refer to Section1.0 Electrical
Personal Data Assistants
Characteristics for available options and the Prod-
Cellular Telephones
uct Identification System for standard options.
Digital Cameras
The MCP73831/2 devices are fully specified over the
MP3 Players
ambient temperature range of -40C to +85C.
Bluetooth Headsets
USB Chargers Package Types
MCP73831/2 MCP73831/2
Typical Application
23 DFN* SOT-23-5
500 mA Li-Ion Battery Charger
V
IN V 1 8 PROG STAT 1 5 PROG
DD
4 3
V V
DD BAT
+
Single
V 2
V 2 7 NC SS
EP
DD
4.7 F Li-Ion
4.7 F
-
Cell 9 V 3 4 V
BAT DD
V 3 6 V
BAT SS
5
PROG
V STAT
4 5
BAT
470
2k
* Includes Exposed Thermal Pad (EP); see Table 3-1.
1 2
V
STAT
SS
MCP73831
2008 Microchip Technology Inc. DS21984E-page 1MCP73831/2
Functional Block Diagram
V
DD
6mA
DIRECTION
CONTROL
V
BAT
G=0.001
6mA
0.5 mA
PROG
CA
+
MCP73831
REFERENCE
ONLY
-
GENERATOR
43.6 k
V
V (1.22V)
REF 361 k 3.9 k DD
+
-
89 k
PRECONDITION
182.3 k
111 k
+
15 k STAT
-
TERMINATION
+
-
7k CHARGE
VA
+
-
190 k
111 k
+
SHDN
-
0.5 mA
DIRECTION
+
CONTROL
V -
BAT
477 k
+ UVLO
-
255 k
100 k
V
SS
DS21984E-page 2 2008 Microchip Technology Inc.