MP2618 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER

MP2618 Rev. 0.92

www.MonolithicPower.com

16

7/14/2010

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Charge Mode?

Battery Full?

Charger “On”,

CHGOK is low

Charger “Off”,

CHGOK is high

C.V.C

C.C.C

T.C.C

Normal Operation

No

Yes

No

Yes

Yes

No

Yes

No

Power Path Management

No charge current

Charge Current

Decrease

Charge Current

<0 ?

SYS Output

Current Increase

No

Yes

No

Yes

Charge Suspend,

CHGOK is high

NTC OK?

Tj>=150

Tj<=130

Charge Current

Thermal Shutdown,

CHGOK is high

Fault Protection

Yes

Charger Recovery,

Return to Normal

Operation

Yes

No

Yes

No

Yes

No

Charge

Termination,

CHGOK is high

Yes

NTC Fault?

No

Timer Out ?

No

Figure 6— Power Path Management Operation and Fault Protection Flow Chart