M62253AGP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC
부품명
상세내역
제조사
M62253AGP Datasheet PDF : 10 Pages
| |||
MITSUBISHI <STD-Linear ICs>
M62253AGP
Charge Control IC for Li-Ion Batteries
(5) The voltage detection block
In a case the battery voltage monitoring via the VSENSE pin is less than 2.6V[2.66V], the charge
is inhibited because of the following two reasons;
a battery is over discharged or a shorted battery is connected.
In a case the battery voltage is more than 2.6V[2.66V], the following two charging current values
are set according to the battery outputs;
the output is between 2.6V[2.66V] and 3.0V[3.07V], resulting in the current measuring resistor drop
of 25mV[26mV], the output is more than 3.0V[3.07V], resulting in that of 250mV[256mV].
The battery voltage rises to 4.1V[4.2V] during the constant current charging, which changes
the constant current charging to the constant voltage one.
When it continues for 1.06sec(C1 =2.2uF) that the battery voltage is less than 3.9V[3..99V]
after the completion of charging, the recharging will start. (The preventing function of erroneous
detection is worked.)
(6) The temperature detecting block
Temperature detection is done through the TIN pin. Detecting battery temperature is
accomplished by utilizing an external resistor and thermistor supplied by the regulated 4.42V[4.53V]
of the VDD pin.
When the TIN voltage is between 1.45V[1.49V] and 3.13V[3.21V], the measured temperature
is regarded as normal according to the internal setting, and then the charging will start. When the
voltage of the TIN pin is less than 1.45V[1.49V] or more than 3.13V[3.21V], the charging is inhibited
due to the decision of the unusual battery temperature.
In a case the TIN voltage is down to below 1.45V[1.49V] after the charging have started,
the charging is stopped until the TIN voltage rises to 1.55V[1.59V] or more. (It has hysteresis
corresponding to battery temperature range of 2.5deg.)
The temperature detection is completed after a sensing voltage is halted for 49ms(C3 =0.1uF).
(The preventing function of erroneous detection is worked.)
(7) The regulated power supply block
For 4.1V type battery ( shorted VrefSW pin and VDD pin ), regulated 4.42V is provided via the
VDD pin.For 4.2V type battery ( VrefSW pin is opened ), regulated 4.53V is provided via the VDD pin.
This regulated voltage is used for detecting battery temperature with the external resistance and
thermistor.
(8) The output block
An external PNP transistor should be connected to the OUT pin because of an opened collector
output circuit configuration.
The maximum output current is 30mA, which will be multiplied by hFE of an external transistor,
thus enabling the high current charging.
(9) The LED driving block
The output configuration of this block is the opened collector by NPN Tr.
The charging states are indicated by using two LEDs. LED1 or LED2 is on during the charge or
at the completion of the charge, respectively. Where "on" is lighting a LED.
The LED indication changes from "the charge" to "the completion of the charge" after 2.21sec
(C2 =2.2uF) form the time when the completion is confirmed by monitoring the charging current.
( 6 / 10)
00-08-24
Share Link: 