MCP73855(2004) 查看數據表（PDF） - Microchip Technology

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MCP73855
(Rev.:2004)

USB Compatible Li-Ion/Li-Polymer Charge Management Controllers

Microchip Technology 

Note 1:

Note 2:

The qualification parameters are continuously

monitored throughout the charge cycle. For more

details on this, refer to Section 4.1 “Charge

Qualification and Preconditioning”.

The charge current will be scaled based on the

die temperature during thermal regulation. For

more details, refer to Section 4.5 “Thermal

Regulation”.

Initialize

NOTE 1

VDD > VUVLO

EN High

Yes

NOTE 1 Temperature OK

Yes

Preconditioning Mode

Charge Current = IPREG

Reset Safety Timer

Yes

VBAT > VPTH

No

VBAT > VPTH

Yes

NOTE 2

Constant-current

Mode

Charge Current = IREG

Reset Safety Timer

No

STAT1 = Off

STAT2 = Off

No

STAT1 = Off

STAT2 = Flashing

Charge Current = 0

STAT1 = On

STAT2 = Off

Constant-voltage Mode

Output Voltage = VREG

VBAT = VREG

Yes

IOUT < ITERM

Elapsed Timer

Expired

Yes

Charge Termination

Charge Current = 0

Reset Safety Timer

No

No

No

Safety Timer

Expired

Yes Fault

Charge Current = 0

Reset Safety Timer

Yes

Safety Timer

Expired

Yes

Temperature OK

No

Yes

Temperature OK

VDD < VUVLO

or EN Low

No

Yes

Temperature OK

No

STAT1 = Flashing

Safety Timer Suspended

Charge Current = 0

No

STAT1 = Off

Yes

STAT2 = Flashing

Safety Timer Suspended

Charge Current = 0

No

STAT1 = Off

STAT2 = On

No

STAT1 = Off

STAT2 = Flashing

Safety Timer Suspended

Charge Current = 0

VDD < VUVLO

VBAT < VRTH

or EN Low

Yes

No

STAT1 = Flashing

STAT2 = Off

FIGURE 4-2:

Operational Flow Algorithm.

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