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MCP201 参数 Datasheet PDF下载

MCP201图片预览
型号: MCP201
PDF下载: 下载PDF文件 查看货源
内容描述: LIN收发器,稳压器 [LIN Transceiver with Voltage Regulator]
分类和应用: 稳压器
文件页数/大小: 40 页 / 397 K
品牌: MICROCHIP [ MICROCHIP ]
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MCP201  
TABLE 1-4:  
FAULT / SLPS SLOPE  
SELECTION DURING POR  
Note:  
Note:  
This pin is ‘0’ whenever the internal circuits  
have detected a short or thermal excursion  
and have disabled the LIN output driver.  
FAULT/SLPS  
Slope Shaping  
H
L
Normal  
Alternate(1)  
Every time TX is toggled, a Fault condition  
will occur for the length of time, depending  
on the bus load. The Fault time is equal to  
the propagation delay.  
Note 1: This mode does not conform to LIN bus  
specification version 1.3, but might be  
used for K-line applications.  
TABLE 1-5:  
TXD In  
FAULT / SLPS TRUTH TABLE  
Thermal  
RXD Out LIN Bus I/O  
Override  
FAULT / SLPS Out  
Comments  
Bus shorted to battery  
L
H
L
H
H
L
L
x
VBAT  
VBAT  
GND  
GND  
VBAT  
OFF  
OFF  
OFF  
OFF  
ON  
L
H
H
L
Bus recessive  
Bus dominant  
H
x
Bus shorted to ground  
Thermal excursion  
L
Legend: x = don’t care  
6.0V. The device will come up in either READY1 or  
READY mode and will have to be transitioned to  
Operational mode to re-enable data transmission.  
1.6  
Internal Voltage Regulator  
The MCP201 has a low drop-out voltage, positive  
regulator capable of supplying 5.00 VDC ±5% at up to  
50 mA of load current over the entire operating  
temperature range. With a load current of 50 mA, the  
minimum input-to-output voltage differential required  
for the output to remain in regulation is typically +0.5V  
(+1V maximum over the full operating temperature  
range). Quiescent current is less than 1.0 mA, with a  
full 50 mA load current, when the input-to-output  
voltage differential is greater than +2V.  
In the start phase, VBAT must be at least 6.0V  
(Figure 1-4) to initiate operation during power-up. In  
Power-down mode, the VBAT monitor will be turned off.  
The regulator has a thermal shutdown. If the thermal  
protection circuit detects an overtemperature condition  
caused by an overcurrent condition (Figure 1-6) of the  
regulator, it will shut down.  
The regulator has an overload current limiting. During  
a short-circuit, VREG is monitored. If VREG is lower than  
3.5V, the regulator will turn off. After a thermal recovery  
time, the VREG will be checked again. If there is no  
short-circuit (VREG > 3.5V), the regulator will be  
switched back on. The MCP201 will come up in either  
READY1 or READY mode and will have to be  
transitioned to Operational mode to re-enable data  
transmission.  
The regulator requires an external output bypass  
capacitor for stability. The capacitor should be either a  
ceramic or tantalum for stable operation over the  
extended temperature range. The compensation  
capacitor should range from 1.0 µf – 22 µf and have a  
ESR or CSR of 0.4Ω – 5.0Ω. The input capacitor, CF, in  
Figure 1.4 should be on the order of 8 to 10 times larger  
than the output capacitor, CG.  
Designed for automotive applications, the regulator will  
protect itself from reverse battery connections, double-  
battery jumps and up to +40V load dump transients.  
The voltage regulator has both short-circuit and  
thermal shutdown protection built-in.  
The accuracy of the voltage regulator, when using a  
pass transistor, will degrade due to the extra external  
components needed. All performance characteristics  
should be evaluated on every design.  
Regarding the correlation between VBAT, VREG and IDD,  
please refer to Figure 1-4 through 1-6. When the input  
voltage (VBAT) drops below the differential needed to  
provide stable regulation, the output VREG will track the  
input down to approximately 3.5V, at which point the  
regulator will turn off. This will allow microcontrollers  
with internal POR circuits to generate a clean arming of  
the Power-on Reset trip point. The MCP201 will then  
monitor VBAT and turn on the regulator when VBAT is  
DS21730F-page 8  
© 2007 Microchip Technology Inc.  
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