MCP73223 Microchip Technology, MCP73223 Datasheet - Page 19

• Manufacturer Part Number: MCP73223
• Description: Lithium Iron Phosphate (LiFePO4) Battery Charge Management Controller
• Manufacturer: Microchip Technology

5.9
The MCP73123/223 shall limit the charge current
based on the die temperature. The thermal regulation
optimizes the charge cycle time while maintaining
device reliability.
regulation for the MCP73123/223 device. Refer to
Section 1.0 “Electrical Characteristics” for thermal
package resistances and Section 6.1.1.2 “Thermal
Considerations” for calculating power dissipation.
.
FIGURE 5-1:
5.10
The MCP73123/223 suspends charge if the die
temperature exceeds +150°C. Charging will be
resumed when the die temperature has cooled by
approximately 10°C. The thermal shutdown is a
secondary safety feature in the event that there is a
failure within the thermal regulation circuitry.
© 2010 Microchip Technology Inc.
600
500
400
300
200
100
0
25 35 45 55 65 75 85 95 105 115 125 135 145
Thermal Regulation
Thermal Shutdown
V
R
DD
PROG
= 5.2V
= 2 kΩ
Figure 5-1
Junction Temperature (°C)
Thermal Regulation.
depicts the thermal
5.11
The charge status outputs are open-drain outputs with
two different states: Low (L), and High Impedance
(Hi-Z). The charge status outputs can be used to
illuminate LEDs. Optionally, the charge status outputs
can be used as an interface to a host microcontroller.
Table 5-2
during a charge cycle.
TABLE 5-2:
5.12
Once a lithium iron phosphate battery is detected, an
internal battery short protection (BSP) circuit starts
monitoring the battery voltage. When V
a typical 1.7V battery short protection threshold voltage
per cell, the charging behavior is postponed.
25 mA (typical) detection current is supplied for
recovering from battery short condition.
Preconditioning mode resumes when V
above battery short protection threshold. The battery
voltage must rise approximately 150 mV above the
battery short protection voltage before the MCP73123/
223 device becomes operational.
Shutdown
Standby
Preconditioning
Constant Current Fast
Charge
Constant Voltage
Charge Complete - Standby
Temperature Fault
Timer Fault
Preconditioning Timer Fault
CHARGE CYCLE
Status Indicator
BATTERY SHORT PROTECTION
STATE
summarizes the state of the status outputs
MCP73123/223
STATUS OUTPUTS
1.6 second 50% D.C.
1.6 second 50% D.C.
1.6 second 50% D.C.
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Flashing (Type 2)
Flashing (Type 2)
Flashing (Type 2)
Hi-Z (Type 1)
Hi-Z (Type 1)
Hi-Z (Type 1)
DS22191B-page 19
STAT
Hi-Z
Hi-Z
Hi-Z
BAT
L
L
L
falls below
BAT
raises