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AIC1731-28CVTR 参数 Datasheet PDF下载

AIC1731-28CVTR图片预览
型号: AIC1731-28CVTR
PDF下载: 下载PDF文件 查看货源
内容描述: 300mA,低漏失线性稳压器,带有关断 [300mA, Low Dropout Linear Regulator with Shutdown]
分类和应用: 稳压器光电二极管
文件页数/大小: 10 页 / 383 K
品牌: AIC [ ANALOG INTERGRATIONS CORPORATION ]
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AIC1731  
DETAILED DESCRIPTIONS OF TECHNICAL TERMS  
is specified by the output current ranging from  
0.1mA to 300mA.  
DROPOUT VOLTAGE (VDROP  
)
The dropout voltage is defined as the difference  
between the input voltage and output voltage at  
which the output voltage drops 100mV. Below  
this value, the output voltage will fall as the input  
voltage reduces. It depends on the load current  
and junction temperature.  
CURRENT LIMIT (IIL)  
AIC1731 includes a current limiting, which  
monitors and controls the maximum output  
current if the output is shorted to ground. This  
can protect the device from being damaged.  
LINE REGULATION  
THERMAL PROTECTION  
Line regulation is the ability of the regulator to  
maintain a constant output voltage as the input  
voltage changes. The line regulation is specified  
as the input voltage changes from VIN = VOUT  
1V to VIN = 7V and IOUT = 1mA.  
Thermal sensor protects device when the  
junction temperature exceeds TJ= +155ºC. It  
signals shutdown logic, turning off pass transistor  
and allowing IC to cool down. After the IC’s  
junction temperature cools by 15ºC, the thermal  
sensor will turn the pass transistor back on.  
Thermal protection is designed to protect the  
device in the event of fault conditions. For a  
continuous operation, do not exceed the absolute  
maximum junction-temperature rating of TJ=  
150ºC, or damage may occur to the device.  
+
LOAD REGULATION  
Load regulation is the ability of the regulator to  
maintain a constant output voltage as the load  
current changes. A pulsed measurement with an  
input voltage set to VIN = VOUT + VDROP can  
minimize temperature effects. The load regulation  
APPLICATION INFORMATION  
INPUT-OUTPUT CAPACITORS  
and circuit board, the temperature difference  
between the die junction and ambient air, and  
the rate of airflow. The rate of temperature rise is  
greatly affected by the mounting pad  
configuration on the PCB, the board material,  
and the ambient temperature. When the IC  
mounting with good thermal conductivity is used,  
the junction temperature will be low even when  
large power dissipation applies.  
Linear regulators require input and output  
capacitors to maintain stability. Input capacitor at  
1µF with a 1uF aluminum electrolytic output  
capacitor is recommended. To avoid oscillation,  
ceramic capacitor is rejected.  
NOISE BYPASS CAPACITOR  
0.1µF bypass capacitor at BP pin reduces output  
voltage noise. And the BP pin has to connect a  
capacitor to GND.  
The power dissipation across the device is  
P = IOUT (VIN-VOUT).  
The maximum power dissipation is:  
POWER DISSIPATION  
The maximum power dissipation of AIC1731  
depends on the thermal resistance of its case  
(TJ TA)  
PMAX =  
(RθJB + RθBA)  
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