MCP73114 Microchip Technology, MCP73114 Datasheet - Page 19

• Manufacturer Part Number: MCP73114
• Description: Single-Cell Li-Ion / Li-Polymer Battery Charge Management Controller with Input Overvoltage Protection
• Manufacturer: Microchip Technology

5.9
The MCP73113/4 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 MCP73113/4 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:
Junction Temperature (T
5.10
The MCP73113/4 suspends charge if the die
temperature exceeds +150°C. Charging will resume
when
approximately 10°C. The thermal shutdown is a
secondary safety feature in the event that there is a
failure within the thermal regulation circuitry.
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.
© 2009 Microchip Technology Inc.
600
500
400
300
200
100
0
the
25 35 45 55 65 75 85 95 105 115 125 135 145
THERMAL REGULATION
THERMAL SHUTDOWN
Status Indicator
summarize the state of the status outputs
V
R
DD
PROG
= 5.2V
die
= 2 kΩ
Figure 5-1
Junction Temperature (°C)
temperature
Charge Current (I
J
).
depicts the thermal
has
OUT
cooled
) vs.
by
TABLE 5-2:
5.12
Once a single-cell Li-Ion battery is detected, an internal
battery short protection (BSP) circuit starts monitoring
the battery voltage. When V
1.7V battery short protection threshold voltage, the
charging behavior is postponed. 25 mA (typical) detec-
tion 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
MCP73113/4 device become operational.
Shutdown
Standby
Preconditioning
Constant Current Fast
Charge
Constant Voltage
Charge Complete - Standby
Temperature Fault
Timer Fault
Preconditioning Timer Fault
CHARGE CYCLE STATE
BATTERY SHORT PROTECTION
short
STATUS OUTPUTS
protection
MCP73113/4
BAT
1.6 second 50% D.C.
1.6 second 50% D.C.
1.6 second 50% D.C.
voltage
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Flashing (Type 2)
Flashing (Type 2)
Flashing (Type2)
falls below a typical
Hi-Z (Type 1)
Hi-Z (Type 1)
Hi-Z (Type 1)
DS22183B-page 19
STAT
Hi-Z
Hi-Z
Hi-Z
L
L
L
before
BAT
raises
the