BM83 datasheet(37/76 Pages) MICROCHIP

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Power Management Unit

The on-chip PMU integrates the battery (lithium-ion and lithium-polymer) charger, and voltage regulator. A power

switch is used to switch over the power source between the battery (BAT_IN) and an adapter (ADAP_IN). The PMU

provides current to drive two LEDs.

The battery charger supports various modes with features listed below:

• Charging control using current sensor

• User-programmable current regulation

• High accuracy voltage regulation

• Constant current and constant voltage modes

• Stop charging and re-charging modes

The following figure illustrates the charging curve of a battery.

Figure 5-1. Battery Charging Curve

Constant Current

Mode

Time

Stage

Constant Voltage

Mode

I_comp

Recharge

Mode

V5 = 0.1V drop

Stop

Charging (back

to re

-charge if

voltage drop >V5

Stops

Charging

Note: For more details on battery charger configuration, refer to the IS2083/BM83 Battery Charger Application Note

(AN3490).

5.1

Power Supply

The BM83 module is powered through the BAT_IN input pin. The following figure illustrates the connection from the

BAT_IN pin to various other voltage supply pins of the IS2083BM SoC on the BM83 module. The external 5V power

adapter can be connected to ADAP_IN in order to charge the battery in battery powered applications or in USB

applications. Otherwise the ADAP_IN pin can be left floating if there is no battery utilized at BAT_IN pin.

BM83

Power Management Unit

Datasheet

DS70005402C-page 37

BM83 Datasheet(PDF) 37 Page - Microchip Technology