BM83 datasheet(37/74 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

• Reviving

• Pre-charging

• Constant current and constant voltage modes

• Re-charging

The following figure illustrates the charging curve of a battery.

Figure 5-1. Battery Charging Curve

Reviving

Mode

Pre charge

Mode

Constant Current (CC)

Mode

Constant Voltage (CV)

Mode

Recharge

Mode

CV Voltage 4.2V

CC Current 0.5c

CC Voltage 3.0V

Pre charge Voltage 2.5V

Pre charge Current 0.1c

Reviving Current 2 mA

Recharge Voltage 4.1V

Recharge Current 0.25c

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

Preliminary Datasheet

DS70005402A-page 37

BM83 Datasheet(PDF) 37 Page - Microchip Technology

BM83 Datasheet(HTML) 37 Page - Microchip Technology

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