MCP73213 datasheet(19/34 Pages) MICROCHIP

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DS22190A-page 19

MCP73213

5.9

Thermal Regulation

The MCP73213 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

MCP73213

device.

Refer

Section 1.0

“Electrical Characteristics” for thermal package

resistances

and

Section 6.1.1.2

“Thermal

Considerations” for calculating power dissipation.

FIGURE 5-1:

Thermal Regulation.

5.10

Thermal Shutdown

The

MCP73213

suspends

charge

the

die

temperature exceeds +150°C. Charging will resume

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.

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)

detection 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 MCP73213

device become operational.

120

150

85 100 115 130 145 160

Junction Temperature (°C)

VDD = 9.1V

RPROG = 10 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 (Type 2)

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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