MCP73123-22SSLASHMF datasheet(14/28 Pages) MICROCHIP

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MCP73123/223

DS22191E-page 14

 2009-2013 Microchip Technology Inc.

5.9

Thermal Regulation

The MCP73123/223 limits the charge current, based

on the die temperature. This thermal regulation

optimizes the charge cycle time while maintaining

device reliability. Figure 5-1

depicts

the thermal

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:

Thermal Regulation.

5.10

Thermal Shutdown

The MCP73123/223 suspends charge if the die

temperature

exceeds

+150°C.

Charging

will

resumed when the die temperature has cooled by

approximately 10°C. This 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

(High-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 summarizes the state of the status outputs

during a charge cycle.

5.12

Battery Short Circuit Protection

When a lithium iron phosphate battery is detected, an

internal battery short circuit protection circuit starts

monitoring the battery voltage. When VBAT is below the

typical 1.7V battery short circuit protection threshold

voltage per cell, the charging behavior is postponed. A

25 mA (typical) detection current is supplied for

recovering from the battery short circuit condition.

Preconditioning mode resumes when VBAT rises above

the battery short circuit protection threshold. The

battery voltage must rise approximately 150 mV above

the battery short circuit protection voltage before the

MCP73123/223 device becomes 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

High-Z

Standby

High-Z

Preconditioning

Constant Current Fast

Charge

Constant Voltage

Charge Complete - Standby

High-Z

Temperature Fault

1.6 second 50% DC

Flashing (Type 2)

High-Z (Type 1)

Timer Fault

1.6 second 50% DC

Flashing (Type 2)

High-Z (Type 1)

Preconditioning Timer Fault

1.6 second 50% DC

Flashing (Type 2)

High-Z (Type 1)

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