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AAT4626IHS-1-T1 参数 Datasheet PDF下载

AAT4626IHS-1-T1图片预览
型号: AAT4626IHS-1-T1
PDF下载: 下载PDF文件 查看货源
内容描述: USB双通道电源开关 [USB Dual-Channel Power Switch]
分类和应用: 开关电源开关
文件页数/大小: 15 页 / 389 K
品牌: AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
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AAT4626  
USB Dual-Channel Power Switch  
Functional Block Diagram  
OUTA  
OUTB  
IN  
Over-  
Temperature  
Protection  
Under-  
Voltage  
Lockout  
ENB (ENB)  
ENA (ENA)  
Over-Temp Protection  
1.2V  
Reference  
Current  
Limit  
Under-Voltage Lockout  
Current Limit  
FLGA  
FLGB  
Over-Temp Protection  
Under-Voltage Lockout  
Current Limit  
the system will be informed via the FAULT flag.  
The ten millisecond fault blanking delay allows the  
AAT4626 to be turned on into large capacitive  
loads without activating the FAULT flags. The  
open drain FAULT outputs can be connected  
directly to system controllers driven by voltage lev-  
els less than the IN pin voltage without additional  
level shifting circuitry.  
Functional Description  
The AAT4626 is a dual integrated MOSFET load  
switch with a fixed level current limit, over-temper-  
ature protection, level shifted inputs, and a fault  
flag for each switch. The current limit control is  
combined with an over-temperature thermal limit  
circuit to provide a comprehensive system to pro-  
tect the load switch under short-circuit or other  
adverse operating conditions. The AAT4626 is ide-  
ally suited for control and protection of peripheral  
ports such as USB, RS232, and parallel ports.  
Each of the two load switches is turned on and off  
by applying a logic level signal to the EN(A/B) pin.  
The AAT4626 enable function is available in both  
active high and active low logic level versions. The  
AAT4626 typically consumes 20µA when operat-  
ing; when off, the device draws less than 1µA. In  
the off state, current is prevented from flowing  
between the input and output on each respective  
channel. The EN(A/B) function has logic level  
thresholds that allow the AAT4626 to be TTL com-  
patible and may also be controlled by 2.5V to 5.0V  
CMOS circuits. The voltage level on either  
EN(A/B) or FAULT(A/B) should not exceed the  
input supply level present on the IN pin.  
The current limit and over-temperature circuits will  
act independently. The device current limit is acti-  
vated when the output load current exceeds a pre-  
set internal threshold level. The minimum current  
limit threshold characteristic is specified by ILIM(MIN)  
.
If the load switch ambient temperature becomes  
excessive or if a short-circuit condition persists, the  
die temperature will rise, causing the over-temper-  
ature protection circuit to activate.  
If the current limit or over-temperature protection  
circuits are active for more than ten milliseconds,  
4626.2006.05.1.2  
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