mm1433 Mitsumi Electronics, Corp., mm1433 Datasheet - Page 9

• Manufacturer Part Number: mm1433
• Description: Lithium-ion Battery Charge Control
• Manufacturer: Mitsumi Electronics, Corp.

MITSUMI
1.2 1mA Charging Operation
1.3 Preparatory Charging Operation
1.4 Full Charging Operation
· At the start of charging, charge waiting results in the following cases (initially prohibited, but charging
· Except in the above cases, charging starts.
· When charging starts, if the battery's voltage is below the low voltage detection voltage (V
· If the battery is overdischarged, a time limit is provided by a 1mA charging timer in order to protect the
· See "OSC CR Settings" on the data sheet for the 1mA charge timer setting.
· When battery voltage is higher than low voltage detection voltage (V
charged by pre-charge current. The standard preparatory charging current is determined by dividing
current limit 2 (V
This status is maintained until the battery's voltage rises and the voltage at pin 13 reaches the
preparatory charging detection voltage (VP).
· However, if for some reason the battery does not reach the preparatory charge detection voltage (VP),
· See "OSC CR Settings" on the data sheet for the preparatory charge timer setting.
· When the battery voltage rises and the voltage at pin 13 reaches the preparatory charge detection
· As the battery voltage rises, operation switches from constant current charging to constant voltage
· After switching to constant voltage charging, the charging current is gradually reduced. When the
· However, a time limit is provided by a full-charge timer in order to protect the battery if, due to some
· See "OSC CR Settings" on the data sheet for the full-charge detection delay timer setting and full-
· If, at the start of charging, the battery is already at BAT pin voltage, charging is continued for the value
4) Pin 12 (TDET) is open.
1) AC adapter supply voltage is less than VADPL or higher than VADPH.
2) Pin 12 (TDET) voltage is outside the range from battery temperature detection voltage L1 (VTL1) to
battery temperature detection voltage H (VTH). Even during charging or when fully charged, neither
LED will light up and the timer will be reset if pin 12 (TDET) voltage is outside the temperature range.
AC adapter abnormality detection, RESET and TDET will operate similarly.
starts when the voltage returns to the normal range):
battery is charged using the 1mA charging current.
battery if the battery voltage does not rise because of some problem. If battery voltage does not reach
VLV within the time set by the 1mA charging timer, charging is prohibited.
the preparatory charge timer limits the time in this state in order to protect the battery. If the battery
does not reach the preparatory charge detection voltage (VP) within the preparatory charge timer's
setting, charging is disabled.
voltage (VP), charging starts using the full charging current. The standard full charging current is
determined by dividing the current limit 1 (VL1) by the value of the external resistance (0.3-Ω
recommended) between pins 14 and 15.
charging when the voltage at pin 13 approaches the output voltage at the BAT pin (VBAT).
charging current drops below the value determined by dividing the full-charge detection value by the
external resistance (0.3-Ω recommended) between pins 14 and 15, charging continues for the value of
the full-charge detection delay timer, then stops, and the open collector NPN transistor at pin 21 (LED
G) turns ON.
abnormality, battery voltage does not reach BAT pin output voltage (VBAT), or if charging current does
not drop off after switching to constant voltage charging and full charge detection does not operate.
After the full charge timer setting time has elapsed, charging will be prohibited in the above cases.
charge timer setting
of the full-charge detection delay timer and then stops, and the open collector NPN transistor at pin 21
(LED G) turns ON.
L2
) by the value of the external resistance (0.3-Ω recommended) between pins 14 and 15.
Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433
LV
), the battery is
LV
), the