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参数资料
| 型号： | ICL7673CBAZA-T |
| 厂商： | Intersil |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH AUTO BATT BACKUP 8SOIC |
| 标准包装： | 1 |
| 应用： | 电池备份，工业/汽车，大电流开关 |
| FET 型： | N 和 P 沟道 |
| 输出数： | 1 |
| 内部开关： | 是 |
| 电源电压： | 2.5 V ~ 15 V |
| 电流 - 电源： | 1.5µA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 标准包装 |
| 产品目录页面： | 1246 (CN2011-ZH PDF) |
| 其它名称： | ICL7673CBAZA-TDKR |
ICL7673
Applications for the ICL7673 include volatile semiconductor
memory storage systems, real-time clocks, timers, alarm
systems, and over/under the voltage detectors. Other
systems requiring DC power when the master AC line supply
A typical application, as illustrated in Figure 12, would be a
microprocessor system requiring a 5V supply. In the event of
primary supply failure, the system is powered down, and a
3V battery is employed to maintain clock or volatile memory
+5V
V P V O
V S
Pbar
LITHIUM
BATTERY
fails can also use the ICL7673.
8
PRIMARY
SUPPLY
2
GND
+
4
-
1
6
V O
+5V OR +3V
R I
STATUS
INDICATOR
data. The main and backup supplies are connected to V P
and V S , with the circuit output V O supplying power to the
clock or volatile memory. The ICL7673 will sense the main
supply, when energized, to be of greater potential than V S
and connect, via its internal MOS switches, V P to output V O .
The backup input, V S will be disconnected internally. In the
event of main supply failure, the circuit will sense that the
backup supply is now the greater potential, disconnect V P
from V O , and connect V S .
GND
FIGURE 7. ICL7673 BATTERY BACKUP CIRCUIT
Figure 11 illustrates the use of external PNP power
transistors to increase the power switching capability of the
circuit. In this application the output current is limited by the
beta and thermal characteristics of the power transistors.
+5V
PRIMARY
SUPPLY
R C
RECHARGEABLE
BATTERY
GND
+
-
8
2
V P
V S
GND
4
V O
1
V O
+5V OR +3V
If hysteresis is desired for a particular low power application,
positive feedback can be applied between the input V P and
open drain output S BAR through a resistor as illustrated in
Figure 12. For high power applications hysteresis can be
applied as shown in Figure 13.
The ICL7673 can also be used as a clipping circuit as
illustrated in Figure 14. With high impedance loads the
FIGURE 8. APPLICATION REQUIRING RECHARGEABLE
BATTERY BACKUP
circuit output will be nearly equal to the greater of the two
input signals.
V P
V S
120/240
VAC
FUSE
BRIDGE
RECTIFIER
STEPDOWN
TRANSFORMER
C 1
8 2
ICL7663
REGULATOR
4 6
R 2
R 1
R 3
D 1
+
-
8 1
ICL7673
BATTERY
BACK-UP
2 4
GND
BATTERY
STACK
V O
FIGURE 9. POWER SUPPLY FOR LOW POWER PORTABLE AC TO DC SYSTEMS
+5V
MAIN
POWER
POWER
FAIL
DETECTOR
INTERRUPT SIGNAL
MICROPROCESSOR
V O
V P
ICL7673
BACKUP CIRCUIT
V S
+
5
VOLATILE
RAM
FIGURE 10. TYPICAL MICROPROCESSOR MEMORY APPLICATION
-
FN3183.4
July 22, 2005
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| ICL7675IPA | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述: |
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