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参数资料
| 型号： | LM4431-2.5MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, UUC |
| 封装： | WAFER |
| 文件页数： | 5/10页 |
| 文件大小： | 169K |
| 代理商： | LM4431-2.5MWC |
Functional Block Diagram
Applications Information
The LM4431 is a micro-power curvature-corrected 2.5V
bandgap shunt voltage reference. For space critical applica-
tions, the LM4431 is available in the sub-miniature SOT-23
surface-mount package. The LM4431 has been designed for
stable operation without the need of an external capacitor
connected between the “+” pin and the “” pin. If, however, a
bypass capacitor is used, the LM4431 remains stable. The
operating current range is 100 A to 15 mA.
The LM4431’s SOT-23 package has a parasitic Schottky di-
ode between pin 2 () and pin 3 (Die attach interface con-
tact). Therefore, pin 3 of the SOT-23 package must be left
floating or connected to pin 2.
In a conventional shunt regulator application (
Figure 1),an
external series resistor (R
S) is connected between the sup-
ply voltage and the LM4431. R
S determines the current that
flows through the load (I
L) and the LM4431 (IQ). Since load
current and supply voltage may vary, R
S should be small
enough to supply at least the minimum acceptable I
Q to the
LM4431 even when the supply voltage is at its minimum and
the load current is at its maximum value. When the supply
voltage is at its maximum and I
L is at its minimum, RS should
be large enough so that the current flowing through the
LM4431 is less than 15 mA.
R
S is determined by the supply voltage, (VS), the load and
operating current, (I
L and IQ), and the LM4431’s reverse
breakdown voltage, V
R.
Typical Applications
DS011374-8
DS011374-9
FIGURE 1. Shunt Regulator
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM443-155.52M | 制造商:CONNOR-WINFIELD 制造商全称:Connor-Winfield Corporation 功能描述:5.0x7.0mm Surface Mount LVDS Clock Oscillator Series |
| LM4431M3-2.5 | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM4431M3-2.5 | 制造商:Texas Instruments 功能描述:IC SM MICROPOWER REFERENCE 2.5V |
| LM4431M3-2.5/NOPB | 功能描述:基准电压& 基准电流 MICROPWR SHUNT VLTG REF RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM4431M3X-2.5 | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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