MCP73113 datasheet(19/34 Pages) MICROCHIP

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DS22183B-page 19

MCP73113/4

5.9

THERMAL REGULATION

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.

Figure 5-1 depicts the thermal

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:

Charge Current (IOUT) vs.

Junction Temperature (TJ).

5.10

THERMAL SHUTDOWN

The

MCP73113/4

suspends

charge

the

die

temperature exceeds +150°C. Charging will resume

when

the

die

temperature

has

cooled

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

Status Indicator

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 summarize the state of the status outputs

during a charge cycle.

5.12

BATTERY SHORT PROTECTION

Once a single-cell Li-Ion battery is detected, an internal

battery short protection (BSP) circuit starts monitoring

the battery voltage. When VBAT falls below a typical

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 VBAT raises

above battery short protection threshold. The battery

voltage must rise approximately 150 mV above the

battery

short

protection

voltage

before

the

MCP73113/4 device become operational.

100

200

300

400

500

600

25 35 45 55 65 75 85 95 105 115 125 135 145

Junction Temperature (°C)

VDD = 5.2V

RPROG = 2 kΩ

TABLE 5-2:

STATUS OUTPUTS

CHARGE CYCLE STATE

STAT

Shutdown

Hi-Z

Standby

Hi-Z

Preconditioning

Constant Current Fast

Charge

Constant Voltage

Charge Complete - Standby

Hi-Z

Temperature Fault

1.6 second 50% D.C.

Flashing (Type2)

Hi-Z (Type 1)

Timer Fault

1.6 second 50% D.C.

Flashing (Type 2)

Hi-Z (Type 1)

Preconditioning Timer Fault

1.6 second 50% D.C.

Flashing (Type 2)

Hi-Z (Type 1)

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