LMV431A
- Low-Voltage Operation/Wide Adjust Range
(1.24 V/30 V) - 0.5% Initial Tolerance (LMV431B)
- Temperature Compensated for Industrial
Temperature Range (39 PPM/°C for
the LMV431AI) - Low Operation Current (55 µA)
- Low Output Impedance (0.25 Ω)
- Fast Turn-On Response
- Low Cost
The LMV431, LMV431A and LMV431B are precision 1.24 V shunt regulators capable of adjustment to 30 V. Negative feedback from the cathode to the adjust pin controls the cathode voltage, much like a non-inverting op amp configuration (Refer to Symbol and Functional Diagrams). A two-resistor voltage divider terminated at the adjust pin controls the gain of a 1.24 V band-gap reference. Shorting the cathode to the adjust pin (voltage follower) provides a cathode voltage of a 1.24 V.
The LMV431, LMV431A and LMV431B have respective initial tolerances of 1.5%, 1%, and 0.5%, and functionally lend themselves to several applications that require zener diode type performance at low voltages. Applications include a 3 V to 2.7 V low drop-out regulator, an error amplifier in a 3 V off-line switching regulator and even as a voltage detector. These parts are typically stable with capacitive loads greater than 10 nF and less than 50 pF.
The LMV431, LMV431A and LMV431B provide performance at a competitive price.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LMV431l;LMV431Al;LMV431B Low-Voltage (1.24V) Adj Precision Shunt Regs datasheet (Rev. G) | 2014/9/22 | |||
| 電子書 | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 2019/6/28 | ||||
| 應用說明 | TO-92 Packing Options / Ordering Instructions (Rev. A) | 2010/6/23 |
設計與開發
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SHUNT-REFERENCE-CALC — Shunt Reference Selector and Design Calculator
SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR — Shunt Voltage Reference External Resistor Quick Start Calculator
此外部電阻快速入門計算機工具可讓您輕鬆計算相對電壓參考、電源供應和負載電流限制的有效外部電阻值。透過這些輸入，您可以立即查看計算結果，並使用顏色編碼指示來了解計算出的輸出是有效或無效值。
許多 TI 參考設計包含 LMV431A
使用我們的參考設計選擇工具，以檢視並找出最適合您的應用和參數的設計。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 5 | Ultra Librarian |
| TO-92 (LP) | 3 | Ultra Librarian |
| SOT-23 (DBZ) | 3 | Ultra Librarian |