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LT1587CT-3.3 参数 Datasheet PDF下载

LT1587CT-3.3图片预览
型号: LT1587CT-3.3
PDF下载: 下载PDF文件 查看货源
内容描述: 7A , 4.6A , 3A低压降快速响应正可调稳压器和固定 [7A, 4.6A, 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed]
分类和应用: 线性稳压器IC调节器电源电路输出元件局域网
文件页数/大小: 12 页 / 278 K
品牌: Linear [ Linear ]
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LT1584/LT1585/LT1587  
W
W
SI PLIFIED SCHE ATIC  
V
IN  
+
THERMAL  
LIMIT  
V
OUT  
ADJ  
GND  
LT1584 • BD  
FOR FIXED VOLTAGE DEVICE  
U
W U U  
APPLICATIONS INFORMATION  
General  
LT1587 family is specifically designed to meet the fast  
current load-step requirements of these microprocessors  
and saves total cost by needing less output capacitance in  
order to maintain regulation.  
The LT1584/LT1585/LT1587 family of three-terminal  
regulatorsiseasytouseandhasalltheprotectionfeatures  
expected in high performance linear regulators. The de-  
vices are short-circuit protected, safe-area protected, and  
provide thermal shutdown to turn off the regulators  
shouldthejunctiontemperatureexceedabout150°C. The  
LT1584/LT1585/LT1587 family includes adjustable and  
fixed voltage versions.  
Stability  
The circuit design in the LT1584/LT1585/LT1587 family  
requires the use of an output capacitor as part of the  
frequency compensation. For all operating conditions, the  
addition of a 22µF solid tantalum or a 100µF aluminum  
electrolytic on the output ensures stability. Normally, the  
LT1584/LT1585/LT1587 can use smaller value capacitors.  
Many different types of capacitors are available and have  
widely varying characteristics. These capacitors differ in  
capacitor tolerance (sometimes ranging up to ±100%),  
equivalent series resistance, equivalent series inductance,  
and capacitance temperature coefficient. The LT1584/  
LT1585/LT1587 frequency compensation optimizes fre-  
quency response with low ESR capacitors. In general, use  
capacitors with an ESR of less than 1.  
These ICs are pin compatible with the LT1083/LT1084/  
LT1085 family of linear regulators but offer lower dropout  
voltage and faster transient response. The trade-off for this  
improved performance is a 7V maximum supply voltage.  
Similar to the LT1083/LT1084/LT1085 family, the LT1584/  
LT1585/LT1587 regulators require an output capacitor for  
stability. However, the improved frequency compensation  
permitstheuseofcapacitorswithmuchlowerESRwhilestill  
maintaining stability. This is critical in addressing the needs  
of modern, low voltage, high speed microprocessors.  
Current generation microprocessors cycle load current  
from almost zero to amps in tens of nanoseconds. Output  
voltage tolerances are tighter and include transient re-  
sponse as part of the specification. The LT1584/LT1585/  
On the adjustable LT1584/LT1585/LT1587, bypassing the  
adjust terminal improves ripple rejection and transient  
response. Bypassing the adjust pin increases the required  
output capacitor value. The value of 22µF tantalum or  
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