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AS1335-BTDT-100 PDF预览

AS1335-BTDT-100

更新时间： 2024-01-13 15:45:56
品牌 Logo 应用领域
艾迈斯 - AMSCO 转换器
页数 文件大小 规格书
18页 1650K
描述
1.5A, 1.5MHz, Synchronous DC/DC Step-Down Converter

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中文翻译

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AS1335-BTDT-100 技术参数

生命周期：UnknownReach Compliance Code：unknown
风险等级：5.76Base Number Matches：1

AS1335-BTDT-100 数据手册

 浏览型号AS1335-BTDT-100的Datasheet PDF文件第7页浏览型号AS1335-BTDT-100的Datasheet PDF文件第8页浏览型号AS1335-BTDT-100的Datasheet PDF文件第9页浏览型号AS1335-BTDT-100的Datasheet PDF文件第11页浏览型号AS1335-BTDT-100的Datasheet PDF文件第12页浏览型号AS1335-BTDT-100的Datasheet PDF文件第13页 
AS1335  
Datasheet - Detailed Description  
Short-Circuit Protection  
This frequency reduction ensures that the inductor current has more time to decay, thus preventing runaway condi-  
tions. fOSC will progressively increase to 1.5MHz when VOUT > 0V or VFB > 0V.  
Dropout Operation  
The AS1335 is working with a low input-to-output voltage difference by operating at 100% duty cycle. In this state, the  
PMOS is always on. This is particularly useful in battery-powered applications with a 3.3V output.  
The AS1335 allows the output to follow the input battery voltage as it drops below the regulation voltage. The quies-  
cent current in this state rises minimally to only 400µA (max), which aids in extending battery life. This dropout (100%  
duty-cycle) operation achieves long battery life by taking full advantage of the entire battery range.  
The input voltage requires maintaining regulation and is a function of the output voltage and the load. The difference  
between the minimum input voltage and the output voltage is called the dropout voltage. The dropout voltage is there-  
fore a function of the on-resistance of the internal PMOS (RDS(ON)PMOS) and the inductor resistance (DCR) and this is  
proportional to the load current.  
Note: At low VIN values, the RDS(ON) of the P-channel switch increases (see Electrical Characteristics on page 4).  
Therefore, power dissipation should be taken in consideration.  
Shutdown  
Connecting EN to GND or logic low places the AS1335 in shutdown mode and reduces the supply current to 0.1µA. In  
shutdown the control circuitry and the internal NMOS and PMOS turn off and SW becomes high impedance discon-  
necting the input from the output. The output capacitance and load current determine the voltage decay rate. For nor-  
mal operation connect EN to VIN or logic high.  
Note: Pin EN should not be left floating.  
Power-OK Functionality  
The AS1335’s power-ok circuitry offers a 215ms delayed power-ok signal. As long as the output voltage is outside of  
the power-ok regulation window the POK pin drives an open-drain low signal. As soon as the output voltage is within  
the regulation window, the internal open-drain MOSFET is turned off and the POK pin can be externally pulled to high.  
The output of the power-ok signal is delayed by 215ms.  
RSI Signal  
With the RSI signal the internal power-ok timer can be reseted or delayed. As long as the input to RSI is high the POK  
signal remains low, regardless of the output voltage condition.  
Thermal Shutdown  
Due to its high-efficiency design, the AS1335 will not dissipate much heat in most applications. However, in applica-  
tions where the AS1335 is running at high ambient temperature, uses a low supply voltage, and runs with high duty  
cycles (such as in dropout) the heat dissipated may exceed the maximum junction temperature of the device.  
As soon as the junction temperature reaches approximately 150ºC the AS1335 goes in thermal shutdown. In this mode  
the internal PMOS & NMOS switch are turned off. The device will power up again, as soon as the temperature falls  
below +125°C again.  
www.austriamicrosystems.com  
Revision 1.02  
10 - 18  
1...78910111213...18

中文翻译

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