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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 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大?。?/td> | 192K |
| 代理商： | MB3790PF |
6
MB3790
I
DESCRIPTION OF OPERATION
1.
Operation When the Input Voltage Goes On or Off
(1) Power-on
While the power supply voltage is less than V
INH
(4.3 V typ), the protected devices such as SRAM or a microprocessor
are in the standby mode with the power supplied by the battery.
When the power supply voltage rises to a level greater than or equal to V
INH
, the PMOS transistor between the input/
output pins turns on and the power for such devices is supplied from the V
IN
pin. At the same time, the primary
battery voltage detection and the secondary battery recharging operations are actuated.
(2) Standby mode
When the power supply voltage rises to a level greater than or equal to V
INH
, the RESET pin outputs a High level
for the set duration of time and the devices such as SRAM or a microprocessor are held in the standby mode. Note
that the set duration of time can be adjusted by changing the capacitance of the C
T
pin.
The RESET pin outputs an inverted signal of the RESET pin.
(3) Active mode
The reset signal is cleared and the devices such as SRAM or a microprocessor are placed in the operating mode.
V
IN
(1)
DV
IN
V
INH
V
INL
V
OUT
RESET
V
IN
-DV
1
V
BAT1
-DV
B1
V
IN
-DV
1
V
BAT1
-DV
B1
t
PO
t
PO
V
IN
-DV
1
RESET
(2)
(3)
(4)
(2)
(3)
(4)
High level
Low level
High level
Low level
High level
Low level
High level
Low level
High level
Low level
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