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參數(shù)資料
| 型號： | LM4050CEM3-2.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Precision Micropower Shunt Voltage Reference |
| 中文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2 V, PDSO3 |
| 封裝： | 3 X 1.30 MM, PLASTIC, TO-236-AB, SOT-23, 3 PIN |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 277K |
| 代理商： | LM4050CEM3-2.0 |
Functional Block Diagram
10104514
Applications Information
The LM4050 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, the LM4050 is available in the sub-miniature SOT-23
surface-mount package. The LM4050 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 LM4050 remains stable. Re-
ducing design effort is the availability of several fixed reverse
breakdown voltages: 2.048V, 2.500V, 4.096V, 5.000V,
8.192V, and 10.000V. The minimum operating current in-
creases from 60 μA for the LM4050-2.0 to 100 μA for the
LM4050-10.0. All versions have a maximum operating cur-
rent of 15 mA.
LM4050s 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.
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.
The typical thermal hysteresis specification is defined as the
change in +25C voltage measured after thermal cycling.
The device is thermal cycled to temperature -40C and then
measured at 25C. Next the device is thermal cycled to
Typical Applications
temperature +125C and again measured at 25C. The re-
sulting V
OUT
delta shift between the 25C measurements is
thermal hysteresis. Thermal hysteresis is common in preci-
sion references and is induced by thermal-mechanical pack-
age stress. Changes in environmental storage temperature,
operating temperature and board mounting temperature are
all factors that can contribute to thermal hysteresis.
In a conventional shunt regulator application (
Figure 1
) , an
external series resistor (R
) is connected between the sup-
ply voltage and the LM4050. R
determines the current that
flows through the load (I
) and the LM4050 (I
). Since load
current and supply voltage may vary, R
should be small
enough to supply at least the maximum guaranteed I
(spec. table) to the LM4050 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
is at its
minimum, R
should be large enough so that the current
flowing through the LM4050 is less than 15 mA.
R
is determined by the supply voltage, (V
), the load and
operating current, (I
L
and I
Q
), and the LM4050’s reverse
breakdown voltage, V
R
.
10104515
FIGURE 1. Shunt Regulator
L
www.national.com
11
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| LM4050CEM3-4.1 | Precision Micropower Shunt Voltage Reference |
| LM4050CEM3-5.0 | Precision Micropower Shunt Voltage Reference |
| LM4050CEM3-8.2 | Precision Micropower Shunt Voltage Reference |
| LM4050CEM3X-10 | Precision Micropower Shunt Voltage Reference |
| LM4050CEM3X-2.0 | Precision Micropower Shunt Voltage Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4050CEM3-3.0 | 制造商:Maxim Integrated Products 功能描述:50PPM/+C PRECISION MICROPOWER SHUNT - Rail/Tube |
| LM4050CEM3-3.0+ | 制造商:Maxim Integrated Products 功能描述:V-REF PRECISION 3V 15MA 3PIN SOT-23 - Cut Tape Product |
| LM4050CEM3-3.0+T | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 50ppm/C Prec uPower Shunt V-Ref w/Rev RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（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 |
| LM4050CEM3-3.0-T | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（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 |
| LM4050CEM3-4.1 | 制造商:Maxim Integrated Products 功能描述:50PPM/+C PRECISION MICROPOWER SHUNT - Rail/Tube |
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