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PAM3101DUB150 参数 Datasheet PDF下载

PAM3101DUB150图片预览
型号: PAM3101DUB150
PDF下载: 下载PDF文件 查看货源
内容描述: 300MA高PSRR低压差CMOS线性稳压器 [300mA High PSRR Low Dropout CMOS Linear Regulator]
分类和应用: 稳压器
文件页数/大小: 24 页 / 488 K
品牌: PAM [ POWER ANALOG MICOELECTRONICS ]
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PAM3101  
300mA High PSRR Low Dropout CMOS Linear Regulator  
Application Information  
Capacitor Selection and Regulator Stability  
in the load current from 1mA to 300mA, is 20mV.  
The ESR of the output capacitor is critical to the  
transient spike. A larger capacitance along with  
smaller ESR results in a smaller spike.  
Similar to any low dropout regulator, the external  
capacitors used with the PAM3101 must be  
carefully selected for regulator stability and  
performance.  
Shutdown Input Operation  
A capacitor CIN of more than 1μF can be employed  
in the input pin, while there is no upper limit for  
the capacitance of CIN. Please note that the  
distance between CIN and the input pin of the  
PAM3101 should not exceed 0.5 inch. Ceramic  
capacitors are suitable for the PAM3101.  
Capacitors with larger values and lower ESR  
(equivalent series resistance) provide better  
PSRR and line-transient response.  
The PAM3101 is shut down by pulling the EN  
input low, and is turned on by tying the EN input  
to VIN or leaving the EN input floating.  
Internal P-Channel Pass Transistor  
The PAM3101 features a 0.75Ω P-Channel  
MOSFET device as a pass transistor. The P-  
MOS pass transistor enables the PAM3101 to  
consume only 65ꢀA of ground current during low  
dropout, light-load, or heavy-load operations.  
This feature increases the battery operation life  
time.  
The PAM3101 is designed specifically to work  
with low ESR ceramic output capacitors in order  
to save space and improve performance. Using  
an output ceramic capacitor whose value is  
>2.2μF with ESR>5mΩ ensures stability.  
Input-Output ( Dropout ) Voltage  
A 10nF bypass capacitor connected to BYP pin is  
suggested for suppressing output noise. The  
capacitor, in series connection with an internal  
200kΩ resistor, forms a low-pass filter for noise  
reduction. Increasing the capacitance will slightly  
decrease the output noise, but increase the start-  
up time.  
A regulator's minimum input-output voltage  
difference (or dropout voltage) determines the  
lowest usable supply voltage. The PAM3101 has  
a typical 300mV dropout voltage. In battery-  
powered systems, this will determine the useful  
end-of-life battery voltage.  
Current Limit and Short Circuit Protection  
Load Transient Considerations  
The PAM3101 features a current limit, which  
monitors and controls the gate voltage of the  
pass transistor. The output current can be  
limited to 400mA by regulating the gate voltage.  
The PAM3101 also has a built-in short circuit  
current limit.  
Curve 10 of the PAM3101 load-transient  
response on page 10 shows two components of  
the output response: a DC shift from the output  
impedance due to the load current change and  
transient response. The DC shift is quite small  
due to excellent load regulation of the PAM3101.  
The transient spike, resulting from a step change  
Power Analog Microelectronics,Inc  
www.poweranalog.com  
09/2008 Rev 1.4  
12