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參數資料
| 型號： | LM4040C-2.5MDA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, UUC |
| 封裝： | DIE |
| 文件頁數： | 11/32頁 |
| 文件大?。?/td> | 440K |
| 代理商： | LM4040C-2.5MDA |
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Applications Information
The LM4040 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, the LM4040 is available in the sub-miniature SOT-23
and SC70 surface-mount package. The LM4040 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 LM4040 remains
stable. Reducing design effort is the availability of several
fixed reverse breakdown voltages: 2.500V, 4.096V, 5.000V,
6.000, 8.192V, and 10.000V. The minimum operating current
increases from 60 A for the LM4040-2.5 to 100 A for the
LM4040-10.0. All versions have a maximum operating cur-
rent of 15 mA.
LM4040s in the SOT-23 packages have a parasitic Schottky
diode between pin 2 () and pin 3 (Die attach interface
contact). Therefore, pin 3 of the SOT-23 package must be
left floating or connected to pin 2.
LM4040s in the SC70 have a parasitic Schottky diode be-
tween pin 1 () and pin 2 (Die attach interface contact).
Therefore, pin 2 must be left floating or connected to pin1.
The 4.096V version allows single +5V 12-bit ADCs or DACs
to operate with an LSB equal to 1 mV. For 12-bit ADCs or
DACs that operate on supplies of 10V or greater, the 8.192V
version gives 2 mV per LSB.
In a conventional shunt regulator application (
Figure 1),an
external series resistor (R
S) is connected between the sup-
ply voltage and the LM4040. R
S determines the current that
flows through the load (I
L) and the LM4040 (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
LM4040 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
LM4040 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 LM4040’s reverse
breakdown voltage, V
R.
Typical Applications
DS011323-15
FIGURE 1. Shunt Regulator
LM4040
www.national.com
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PDF描述 |
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| LM4040D-1.2MDC | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.2 V, UUC |
| LM4040D41ILPRE3 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 4.096 V, PBCY3 |
| LM4040A50IDBZT | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PDSO3 |
| LM4040A82IDBZT | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 8.192 V, PDSO3 |
| LM4040B10IDCKR | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 10 V, PDSO5 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM4040C25MDBZTEP | 功能描述:基準電壓& 基準電流 EP 2.5V PREC MICRO POWER SHUNT VLTG REF RoHS:否 制造商:STMicroelectronics 產品:Voltage References 拓撲結構:Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| LM4040C25QDBZR | 功能描述:基準電壓& 基準電流 2.5-V Precision Mcrpwr Shunt .5% acc RoHS:否 制造商:STMicroelectronics 產品:Voltage References 拓撲結構:Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| LM4040C25QDBZRG4 | 功能描述:基準電壓& 基準電流 2.5-V Precision Mcrpwr Shunt .5% acc RoHS:否 制造商:STMicroelectronics 產品:Voltage References 拓撲結構:Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| LM4040C25QDBZT | 功能描述:基準電壓& 基準電流 2.5-V Precision Mcrpwr Shunt .5% acc RoHS:否 制造商:STMicroelectronics 產品:Voltage References 拓撲結構:Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| LM4040C25QDBZTG4 | 功能描述:基準電壓& 基準電流 2.5-V Precision Mcrpwr Shunt .5% acc RoHS:否 制造商:STMicroelectronics 產品:Voltage References 拓撲結構:Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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