參數(shù)資料
型號(hào)： MB3790PF
廠商： FUJITSU LTD
元件分類： 電源管理
英文描述： Battery Backup IC
中文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： PLASTIC, SOP-16
文件頁(yè)數(shù)： 5/21頁(yè)
文件大?。?/td> 192K
代理商： MB3790PF
5
MB3790
I
FUNCTIONAL DESCRIPTION
1.
Battery Backup Function
When the power supply voltage exceeds the voltage detection level (i.e., V
INH
), the device outputs a current of
up to 200 mA from the V
IN
power supply to the load circuit via the V
OUT
pin.
When the power supply voltage is less than or equal to V
INL
, the device switches the source of power for V
OUT
from V
IN
to the primary or secondary battery for backup purposes.
2.
When the power supply voltage drops below V
INL
, the voltage level detection comparator is actuated to perform the
following (note that the detection voltage level has the hysteresis characteristics listed in ELECTRICAL CHARAC-
TERISTICS in this data sheet):
Power Supply Voltage Level Detect Function
The comparator first outputs the RESET signal (High level).
It switches the source of power for the load circuit to the primary or secondary battery.
The power supply voltage detection level can be adjusted by fitting an external resistor to the V
SENSE
pin. When
adjusting the detection level, be sure to set it to 4.0 V or higher by considering the power supply voltage for the
internal circuit operation.
In addition, the detection set time can be extended by connecting a capacitator. For this method of adjustment, refer
to APPLICATION in this data sheet.
3.
This is a temperature-compensated reference voltage circuit of a band gap type so that it outputs a trimming-
adjusted exact reference voltage.
Reference Voltage Circuit
The reference voltage power supply is used to set the reference voltage/constant current values of the detection
circuit, as well as the secondary battery recharging voltage.
4.
By charging the capacitator connected to the C
T
pin with constant current (approx. 3
μ
A), this function determines
the reset pulse width. The calculation formula for this is given below:
Power-on Reset Function
Reset pulse width t
PO
(sec)
C
T
(F)
×
10
6
(When C
T
= 1000 pF, t
PO
1 ms [typ])
5.
If the primary battery voltage drops below the detection level when the power supply voltage is greater than or equal
to V
INL
, the device outputs an alarm signal (Low level) from the CMOS output pin, ALARM1 or ALARM2.
Primary Battery Voltage Detection Function
Note that the voltage level detection comparator has the hysteresis characteristics listed in ELECTRICAL CHAR-
ACTERISTICS in this data sheet.
When the primary battery voltage is 2.65 V [typ] or less:
The ALARM1 output pin is forced to a Low level to issue an alarm indicating that it’s time to replace the primary
battery.
When the primary battery voltage is 2.37 V [typ] or less:
The ALARM2 output pin is forced to a low level to issue an alarm indicating that the primary battery voltage
is less than the voltage necessary to retain the SRAM data (approx. 2.0 V)
6.
When the power supply voltage is greater than or equal to V
INL
, the device recharges the secondary battery using
the constant-voltage method of charging. Note that the typical value of the device's internal recharging resistor is
500 ohms.
Secondary Battery Recharging Function
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