MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER

MP2619 Rev. 1.01

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12

5/28/2015

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When time-out occurs, charger is suspended.

And only refresh the input power or EN signal or

4V/cell) can restart the charge cycle.

Negative

Thermal

Coefficient

(NTC)

Thermistor

The MP2619 has a built-in NTC resistance

window comparator, which allows MP2619 to

sense the battery temperature via the thermistor

packed internally in the battery pack to ensure a

safe operating environment of the battery. A

resistor with appropriate value should be

connected from VREF33 to NTC pin and the

thermistor is connected from NTC pin to GND.

The voltage on NTC pin is determined by the

resistor divider whose divide ratio depends on

the battery temperature. When the voltage of pin

NTC falls out of NTC window range, MP2619 will

stop the charging. The charger will restart if the

temperature goes back into NTC window range.

Power Path Management

MP2619 can implement a switching charger

circuit with power path management function,

which realizes the current sharing of the charger

and system load. In another word, MP2619

senses the system current and feeds it back,

then reduces charge current according to the

increase of the system current.

However, after the charge current decrease to 0,

the system current can only be limited by the

adapter.

The system current is satisfied first and always. It

chooses the adapter as its power source when

the adapter plugs in, and the battery is the

backup power source when the adapter is

removed.

Figure 2 to 6 shows the charge profile, operation

waveform and flow chart, respectively.