M62253AGP 查看數據表（PDF） - MITSUBISHI ELECTRIC
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M62253AGP Datasheet PDF : 10 Pages
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4. Functional Description
MITSUBISHI <STD-Linear ICs>
M62253AGP
Charge Control IC for Li-Ion Batteries
Notice: The voltage value within [ ] is for 4.2V type battery. And the voltage value
w ithout [ ] is for 4.1V type battery or common value for both (4.1V and 4.2V) battery.
(1) Setting 4.1V type or 4.2V type battery
If using 4.1V type battery, make VrefSW pin and VDD pin short. In this case, 4.1V constant charging
is performed because internal referential voltage is set at 4.1V.
If using 4.2V type battery, make VrefSW pin open. In this case, 4.2V constant charging is performed
because internal referential voltage is set at 4.2V.
The resistance divider between VDD and GND sets internal referential voltage. Changing VDD
voltage by switching VDD pin shorted to VrefSW pin or opened sets referential voltage for constant
charge 4.1V or 4.2V.
(2) Detection of connecting/disconnecting a battery
The connecting/disconnecting of a battery is detected via the TIN pin. The detection is performed
by using an external resistor and thermistor supplied by the regulated 4.42V[4.53V] of the VDD pin.
When the pin TIN voltage is between 1.45V[1.49V] and 3.13V[3.21V], it is confirmed that a battery
is connected according to the internal setting.
When the TIN pin voltage is less than 1.45V[1.49V] or more than 3.13V[3.21V], the charge
is inhibited owing to possibilities of disconnecting a battery or unusual battery temperature.
The charging start conditions (In a case a battery is connected)
The charging voltage is set to 4.1V[4.2V], when the battery connection is confirmed.
1.15second (C2 = 2.2uF) later, the voltage is changed to 2.55V[2.61V] and then the detection of
battery voltage will be started. (The voltage detection is not carried out until the voltage change
to 2.55V[2.61V].)
During the 4.1V[4.2V] constant voltage output, the voltage drop caused by the current detecting
resistor is limited to 250mV[256mV].
When the battery voltage is between 2.6V[2.66V] and 4.1V[4.2V], the constant current charging
starts.
In the case the voltage is more than 4.1V[4.2V], the 4.1V[4.2V] constant voltage charging starts
with monitoring the charging current.
(3) The constant current control block and the current detection
The charging current is measured between the SENSE+ and SENSE- pins, so that the constant
current control is performed.
The current sensing resistor drop is set as follows;
in a case the battery voltage is between 2.6V[2.66V] / 3.0V[3.07V] or more than 3.0V[3.07V],
it is set to 25mV[26mV] or 250mV[256mV], respectively.
When the above voltage drop of less than 25mV[26mV] continues for 1.15sec(C2 =2.2uF)
during the constant voltage charging, completion of the charge is confirmed and then the output
changes to the constant voltage of 2.55V[2.61V]. (The preventing function of erroneous detection
is worked.)
(4) The constant voltage control block
The battery voltage and the output voltage is measured via the VSENSE pin.
When the battery voltage rises to 4.1[4.2V]V or more by the constant current charging, the
4.1V[4.2V] constant voltage control starts alternatively.
When the above voltage drop of less than 25mV[26mV] continues for 1.15sec(C2 = 2.2uF)
during the constant voltage charging, completion of the charge is confirmed and then the output
changes to the constant voltage of 2.55V[2.61V]. (The preventing function of erroneous detection
is worked.)
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00-08-24
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