參數(shù)資料
型號(hào)： MB3893A
廠商： Fujitsu Limited
英文描述： Power Management IC for Mobile Phone
中文描述： 電源管理IC的移動(dòng)電話
文件頁(yè)數(shù)： 25/44頁(yè)
文件大小： 496K
代理商： MB3893A
MB3893A
25
(8) POR Block
When the output voltage from the regulator (OUT1) exceeds 2.3 V (Typ.), the XRST terminal (pin 35) goes to
“H” level following a delay time (85 ms (Typ.)) set by capacitors (0.1
μ
F (Typ.)) connected between the C1 terminal
(pin 7) and the GND1 terminal (pin 8) and GND2 terminal (pin 39). Also, when the regulator (OUT1) output
voltage falls below 2.2 V ((Typ.)), the XRST terminal goes back to “L” level.
(9) Initial Power Supply Drop Detection 1
This block controls MB3893A operation when VCC startup occurs at VCC voltage of 2.0V (Typ.) or greater. When
VCC voltage exceeds 2.75V (Typ.) the VCONT terminal (pin 16) voltage goes to “H” level, and the regulated
voltage is output from the OUT1 terminal (pin 29), OUT2 terminal (pin 30), and OUT4 terminal (pin 22). When
VCC voltage falls below 3.1V (Typ.), the voltage at the OUT1, OUT2, and OUT4 terminals is outside of rated
values. Then when VCC voltage falls below 2.5V (Typ.), the VCONT terminal (pin 16) voltage goes to “L” level,
and the OUT1, OUT2, and OUT4 terminals go to “L” level (regulator “OFF” state). Hereafter this is referred to
as “L” level. As long as the VCC voltage rises again before dropping below 2.0V (Typ.), the VCONT pin voltage
will return to “H” level once VCC reaches 3.5 V (Typ.), and the regulated voltage is output from the OUT1, OUT2,
and OUT4 terminals.
(10) Transient Power Supply Drop Detection 2
This block detects two types of power supply drop times according to the time constants CR1 and CR2, and
produces the related output at the VBDET1 terminal (pin 34) and VBDET2 terminal (pin 33).
2.
Charge Control Block
The charge control block checks VIN, battery voltage, and battery temperature before charging. If the results
are within normal ranges, charging begins. During charging, the charging times and current levels are varied
according to battery voltage. The VIN and battery temperature are monitored, and if either exceeds the normal
range charging is stopped. Conditions are then monitored for a fixed time (16 min (Typ.)) and a resume charging/
abnormal termination determination is made.
The MB3893A also provides an overcharge protection function, as well as a function that stops charging when
a rise in IC junction temperature is detected.
Once charging has stopped due to any of these abnormal conditions, it can be resumed by re-input of VIN, or
by removing and replacing the battery.
(1) Constant Current/Constant Voltage Charging
The MB3893A applies a constant current charge according to the battery voltage level, selecting over discharge
recovery charging (2.1 mA (Typ.)), preliminary charging (80 mA (Typ.)) or rapid charging (590 mA (Typ.)). Once
battery voltage reaches 4.1 V (4.2 V), constant voltage charging is applied until the charge current falls to 53
mA (Typ.) at constant voltage.
(2) Timer Function
The timer switches the charging time according to the battery voltage level, between over discharge recovery
charging (15 s (Typ.)), preliminary charging (16 min (Typ.)), and rapid charging (240 min (Typ.)).
(3) Temperature/AC Adapter Voltage Detection
This block detects the battery temperature and AC adapter voltage, and stops charging if either is outside of the
normal charging range. If normal conditions are restored within a set time (16 min (Typ.)), charging is resumed,
otherwise an abnormal termination is determined.
(4) Over-Charge Protection
If battery voltage exceeds 4.3 V (Typ.) this block determines an abnormal condition, and stops charging.
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