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LP3875ES-3.3/NOPB 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
稳压芯片
封装:
TO-263-6
描述:
LP3872 / LP3875 1.5A快速超低压降线性稳压器 LP3872/LP3875 1.5A Fast Ultra Low Dropout Linear Regulators
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P3Hot
典型应用电路图在P1P11P12
原理图在P8
封装尺寸在P19P20P22P23P24
标记信息在P19P20P21
封装信息在P18P19P20P21P22P23P24
技术参数、封装参数在P4
应用领域在P1
电气规格在P5P6P15
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LP3875ES-3.3/NOPB数据手册
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LP3872
,
LP3875
www.ti.com
SNVS227H –FEBRUARY 2003–REVISED JANUARY 2015
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LP387x devices are linear regulators designed to provide high load current of up to 1.5 A, low dropout
voltage, and low quiescent current in shutdown mode. Figure 12 and Figure 13 show the typical application
circuit for these devices.
8.1.1 Dropout Voltage
The dropout voltage of a regulator is defined as the minimum input-to-output differential required to stay within
2% of the nominal output voltage. For CMOS LDOs, the dropout voltage is the product of the load current and
the R
ds(on)
of the internal MOSFET.
8.1.2 Reverse Current Path
The internal MOSFET in LP3872 and LP3875 has an inherent parasitic diode. During normal operation, the input
voltage is higher than the output voltage and the parasitic diode is reverse biased. However, if the output is
pulled above the input in an application, then current flows from the output to the input as the parasitic diode gets
forward biased. The output can be pulled above the input as long as the current in the parasitic diode is limited to
200-mA continuous and 1-A peak.
8.2 Typical Application
*SD and ERROR pins must be pulled high through a 10-kΩ pullup resistor. Connect the ERROR pin to ground if this
function is not used. See the Shutdown Mode and ERROR Flag Operation sections.
Figure 12. LP3872 Typical Application Circuit
*SD must be pulled high through a 10-kΩ pullup resistor. See the Shutdown Mode section.
Figure 13. LP3875 Typical Application Circuit
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