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AMS1085CT-2.85 PDF预览

AMS1085CT-2.85

更新时间： 2024-01-22 11:57:08
品牌 Logo 应用领域
ADMOS 稳压器
页数 文件大小 规格书
9页 277K
描述
3A LOW DROPOUT VOLTAGE REGULATOR

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AMS1085CT-2.85 技术参数

是否Rohs认证： 符合生命周期：Contact Manufacturer
包装说明：, SIP3,.1TBReach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.82可调性：FIXED
标称回动电压 1：1.2 V最大绝对输入电压：15 V
最大电网调整率：0.01%最大负载调整率：0.02%
输出次数：1端子数量：3
工作温度TJ-Max：125 °C工作温度TJ-Min：-40 °C
最大输出电流 1：3 A标称输出电压 1：2.85 V
封装主体材料：PLASTIC/EPOXY封装等效代码：SIP3,.1TB
认证状态：Not Qualified调节器类型：FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
子类别：Other Regulators表面贴装：NO
技术：BIPOLAR端子节距：2.54 mm
端子位置：SINGLE最大电压容差：2%

AMS1085CT-2.85 数据手册

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AMS1085  
APPLICATION HINTS  
This current is normally the specified minimum load current of  
10mA. Because IADJ is very small and constant it represents a  
small error and it can usually be ignored.  
Connected as shown, RP not multiplied by the divider ratio.  
is  
Using 16-gauge wire the parasitic line resistance is about 0.004Ω  
per foot, translating to 4mV/ft at 1A load current. It is important  
to keep the positive lead between regulator and load as short as  
possible and use large wire or PC board traces.  
AMS1085  
VOUT  
VIN  
IN  
OUT  
ADJ  
Thermal Considerations  
VREF  
R1  
R2  
The AMS1085 series have internal power and thermal limiting  
circuitry designed to protect the device under overload conditions.  
However maximum junction temperature ratings should not be  
exceeded under continuous normal load conditions. Careful  
consideration must be given to all sources of thermal resistance  
from junction to ambient, including junction-to-case, case-to-heat  
sink interface and heat sink resistance itself. To ensure safe  
operating temperatures and reflect more accurately the device  
temperature, new thermal resistance specifications have been  
developed. Unlike older regulators with a single junction-to-case  
thermal resistance specification, the data section for these new  
regulators provides a separate thermal resistance and maximum  
junction temperature for both the Control Section and the Power  
Transistor. Calculations for both temperatures under certain  
conditions of ambient temperature and heat sink resistance and to  
ensure that both thermal limits are met.  
IADJ  
50µA  
VOUT = VREF (1+ R2/R1)+IADJR2  
Figure 1. Basic Adjustable Regulator  
Load Regulation  
True remote load sensing it is not possible to provide, because the  
AMS1085 is a three terminal device. The resistance of the wire  
connecting the regulator to the load will limit the load regulation.  
The data sheet specification for load regulation is measured at the  
bottom of the package. Negative side sensing is a true Kelvin  
connection, with the bottom of the output divider returned to the  
negative side of the load.  
The best load regulation is obtained when the top of the resistor  
divider R1 is connected directly to the case not to the load. If R1  
were connected to the load, the effective resistance between the  
regulator and the load would be:  
Junction-to-case thermal resistance is specified from the IC  
junction to the bottom of the case directly below the die. This is  
the lowest resistance path for the heat flow. In order to ensure the  
best possible thermal flow from this area of the package to the  
heat sink proper mounting is required. Thermal compound at the  
case-to-heat sink interface is recommended.  
A thermally  
conductive spacer can be used, if the case of the device must be  
electrically isolated, but its added contribution to thermal  
resistance has to be considered.  
RP x ( R2+R1 ) , RP = Parasitic Line Resistance  
R1  
RP  
PARASITIC  
LINE RESISTANCE  
AMS1085  
VIN  
IN  
OUT  
ADJ  
RL  
R1*  
R2*  
*CONNECT R1 TO CASE  
CONNECT R2 TO LOAD  
Figure 2. Connections for Best Load Regulation  
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723  
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