MCP73831-2ACI/OT MICROCHIP [Microchip Technology], MCP73831-2ACI/OT Datasheet - Page 11

• Manufacturer Part Number: MCP73831-2ACI/OT
• Description: Miniature Single-Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

4.5
When the voltage at the V
tion voltage, V
The regulation voltage is factory set to 4.2V, 4.35V,
4.40V, or 4.50V with a tolerance of ±0.75%.
4.6
The charge cycle is terminated when, during Constant-
Voltage mode, the average charge current diminishes
below a percentage of the programmed charge current
(established with the value of the resistor connected to
the PROG pin). A 1 ms filter time on the termination
comparator ensures that transient load conditions do
not result in premature charge cycle termination. The
percentage or ratio of the current is factory set. Refer
to Section
charge termination current options and the “Product
Identification System” for standard options.
The charge current is latched off and the MCP73831/2
enter a Charge Complete mode.
4.7
The MCP73831/2 continuously monitor the voltage at
the V
age drops below the recharge threshold, another
charge cycle begins and current is once again
supplied to the battery or load. The recharge threshold
is factory set. Refer to Section 1.0 “Electrical Char-
acteristics” for recharge threshold options and the
Product Identification System for standard options.
© 2006 Microchip Technology Inc.
BAT
Constant-Voltage Mode
Charge Termination
Automatic Recharge
pin in the Charge Complete mode. If the volt-
REG
1.0 “Electrical Characteristics” for
, constant voltage regulation begins.
BAT
pin reaches the regula-
4.8
The MCP73831/2 limit the charge current based on
the die temperature. The thermal regulation optimizes
the charge cycle time while maintaining device
reliability. Figure 4-2 depicts the thermal regulation for
the MCP73831/2.
FIGURE 4-2:
4.9
The MCP73831/2 suspend charge if the die tempera-
ture exceeds 150°C. Charging will resume when the
die temperature has cooled by approximately 10°C.
525
450
375
300
225
150
75
Thermal Regulation
Thermal Shutdown
0
Junction Temperature (°C)
MCP73831/2
Thermal Regulation.
DS21984B-page 11
R
PROG
= 2 k