M62253BGP 데이터 시트보기 (PDF) - Renesas Electronics
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M62253BGP Datasheet PDF : 13 Pages
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M62253BGP
Functional Description
(1) Detection of connection/disconnection of battery
Connection/disconnection of battery is detected via TIN pin. The detection is performed by external resistor and
thermistor using the regulated 4.53 V of VDD terminal.
When TIN terminal voltage is between 1.49 V and 3.21 V, battery is confirmed to be connected according to the
internal setting.
When TIN terminal voltage is 1.49 V or less, or 3.21 V or more, charge is inhibited owing to possibilities of battery
din connection or unusual battery temperature.
Charging start conditions (when battery is confirmed to be connected)
Charging voltage is set to 4.2 V when battery connection is confirmed.
1.15 second (C2 = 2.2 µF) later, the voltage is changed to 1.46 V to detect battery voltage. (Voltage detection is
not done until the voltage is changed to 1.46 V.)
During 4.2 V constant voltage output, the voltage drop by current detecting resistor is limited to 256 mV.
When battery voltage is between 1.54 V and 4.2 V, constant current charge gets started.
In the case the voltage is 4.2 V or more, 4.2 V constant voltage charging starts to monitor charging current.
(2) Constant current control block and current detection
Charging current is measured between SENSE+ and SENSE– terminals so that constant current control is performed.
Current sensing resistor voltage drop is set as follows:
When battery voltage is between 1.54 V and 3.07 V, voltage drop is set to 26 mV.
When battery voltage is 3.07 V or more, voltage drop is set to 256 mV.
When charge current is detected and battery voltage is 4.1 V or more, and the above voltage drop of less than one
fifth of ADJ terminal voltage continues for 1.15 second (C2 = 2.2 µF) during constant voltage charging, completion
of charge is confirmed and then output changes to constant voltage of 1.46 V.
(Preventing function of erroneous detection works.)
(3) Constant voltage control block
Battery voltage and output voltage is measured via VSENSE terminal.
When battery voltage rises up to 4.2 V or more by constant current charging, 4.2 V constant voltage control starts
instead.
When the above voltage drop of less than one fifth of ADJ terminal voltage continues for 1.15 second (C2 = 2.2 µF)
during constant voltage charging, charge completion is confirmed and then output changes to constant voltage of
1.46 V. (The preventing function of erroneous detection works.)
(4) Voltage detection block
When battery voltage monitored via the VSENSE terminal is 1.54 V or less, charging is inhibited by confirming that
battery is over discharged or shorted battery is connected.
When battery voltage is 1.54 V or more, following two charging current values are to be set according to the battery
outputs:
When battery voltage is between 1.54 V and 3.07 V, current measuring resistor voltage drop is set to 26 mV. When
battery voltage is 3.07 V or more, above voltage drop is set to 256 mV.
When battery voltage rises up to 4.2 V during the constant current charging, constant voltage charging gets started.
When battery voltage is 3.99 V or less for 1.06 second (C1 = 2.2 µF) after charge completion, recharging will start.
(Prevention function of erroneous detection works.)
(5) Temperature detecting block
Temperature detection is done through TIN terminal. Detecting battery temperature is accomplished by external
resistor and thermistor using the regulated 4.53 V of the VDD terminal.
When TIN voltage is between 1.49 V and 3.21 V, measured temperature is regarded as normal according to internal
setting, then charging will start. When TIN voltage is 1.49 V or less, or 3.21 V or more, charging is inhibited due to
the decision of the unusual battery temperature.
When TIN voltage goes down to 1.49 V or less after charging starts, charging stops until TIN voltage rises up to 1.59
V or more. (It has hysteresis corresponding to battery temperature range of 2.5°C.)
Temperature detection is completed after 49 ms (C3 = 0.1 µF) halt of detection voltage. Preventing function of
erroneous detection works.)
REJ03F0243-0200 Rev.2.00 Sep 14, 2007
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