MP26075 – HIGH EFFICIENCY CRADLE CHARGER

MP26075 Rev. 1.01

www.MonolithicPower.com

11

5/23/2011

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Fault Indication

Charger off

Adapter OK?

VIN_UVLO<VIN<VIN_OVP

Start

Battery OK?

NTC connection

YES

NO

NO

Timer Out?

Charge Mode?

?

YES

Battery Full ?

YES

Charge On,

LED-R on &

LED-G off

Finish charging

LED-R off& LED-G on

VIN=5V

CC-charge

VIN=BATT+0.5V

TC-Charge

VIN=5V

Pre -Charge

VIN=5V

NO

YES

NO

NO

NO

Normal Operation

CV-charge

VIN=BATT+0.5V

YES

NO

YES

NO

Timer Out?

NO

YES

YES

Any Protection

?

NO

Whole charge

Timer Out?

YES

NO

YES

NTC Fault?

YES

Charge Suspend

NTC OK?

Thermal

Protection

YES

YES

Charger Recovery

Fold back charge

current

Fault Protection

NO

Charge Termination

Float LED-R and

LED-G

YES

NO

NO

Figure 4— Normal Charge Operation and Fault Protection Flow Chart