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GM66300-2.5TA3R 参数 Datasheet PDF下载

GM66300-2.5TA3R图片预览
型号: GM66300-2.5TA3R
PDF下载: 下载PDF文件 查看货源
内容描述: 超3A低压降稳压器 [3A ULTRA LOW-DROPOUT REGULATOR]
分类和应用: 稳压器
文件页数/大小: 11 页 / 347 K
品牌: GAMMA [ GAMMA MICROELECTRONICS INC. ]
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Input Capacitor  
The error flag is an open-collector output that can  
sink 10mA during a fault condition. Low output  
voltage can be caused by a number of problems,  
including an overcurrent fault (device in current limit)  
or low input voltage. The flag is inoperative during  
overtemperature shutdown. When the error flag is  
not used, it is best to leave it open. The flag pin can  
be tied directly to pin 4, the output pin.  
An input capacitor of 1µF or greater is recommended  
when the device is more than 4 inches away from the  
bulk as supply capacitance, or when the supply is a  
battery. Small surfacemount ceramic chip capacitors  
can be used for the bypassing. Larger values will help  
to improve ripple rejection by bypassing the input to the  
regulator, further improving the integrity of the output  
voltage.  
Enable Input  
Transient Response and 3.3V to 2.5V and 2.5V to  
1.8V Conversions  
The GM66300 series version features an enable  
input for on/off control of the device. Its shutdown  
state draws "zero" current. The enable input is  
TTL/CMOS compatible for simple logic interface, but  
can be connected to up to 20V. When enabled, it  
draws approximately 15µA.  
The GM66300 series has excellent transient response  
to variations in input voltage and load current. The  
device has been designed to respond quickly to load  
current variations and input voltage variations. Large  
output capacitors are not required to obtain this  
performance. A standard 47µF output capacitor,  
preferably tantalum, is all that is required. Larger  
values improve performance even further.  
By virtue of its low-dropout voltage, this device does  
not saturate into dropout as readily as similar NPN-  
based designs. When converting from 3.3V to 2.5V or  
2.5V to 1.8V, the NPN-based regulators are already  
operating in dropout, with typical dropout requirements  
of 1.2V or greater. To convert down to 2.5V without  
operating in dropout, NPN-based regulators require an  
input voltage of 3.7V at the very least.  
The GM66300 series regulator will provides excellent  
performance with an input as low as 3.0V or 2.5V  
respectively. This gives the PNP-based regulators a  
distinct advantage over older, NPN-based linear  
regulators. A typical NPN regulator does not have the  
headroom to do this conversion.  
Minimum Load Current  
The GM66300 series regulator is specified between  
finite loads. If the output current is too small, leakage  
currents dominate and the output voltage rises. A  
10mA minimum load current is necessary for proper  
regulation.  
Error Flag  
The GM66300 series version features an error flag  
circuit which monitors the output voltage and signals  
an error condition when the voltage 5% below the  
nominal output voltage.  
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