參數(shù)資料
型號(hào)： LM4040AIZ-4.1X
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 4.096 V, PBCY3
封裝： PLASTIC, TO-92, 3 PIN
文件頁(yè)數(shù)： 19/32頁(yè)
文件大?。?/td> 1298K
代理商： LM4040AIZ-4.1X
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: 2.048V, 2.500V, 3.000V,
4.096V, 5.000V, 6.000, 8.192V, and 10.000V. The minimum
operating current increases from 60 A for the LM4040-2.048
and LM4040-2.5 to 100
μA for the LM4040-10.0. All versions
have a maximum operating current of 15 mA.
LM4040s in the SOT-23 packages have a parasitic Schottky
diode 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.
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.
The typical thermal hysteresis specification is defined as the
change in +25°C voltage measured after thermal cycling. The
device is thermal cycled to temperature -40°C and then mea-
sured at 25°C. Next the device is thermal cycled to tempera-
ture +125°C and again measured at 25°C. The resulting
V
OUT delta shift between the 25°C measurements is thermal
hysteresis. Thermal hysteresis is common in precision refer-
ences and is induced by thermal-mechanical package 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
S) is connected between the supply
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
1132315
FIGURE 1. Shunt Regulator
www.national.com
26
LM4040
相關(guān)PDF資料
PDF描述
LM4040EEM3-2.5X 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO3
LM4040BIM3-8.2X 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 8.192 V, PDSO3
LM4040BIM3-5.0X 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PDSO3
LM4040DIM3-2.5X 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO3
LM4040AIM3-4.1X 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 4.096 V, PDSO3
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4040AIZ-5 制造商:Texas Instruments 功能描述:
LM4040AIZ-5.0 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LM4040AIZ-5.0/NOPB 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 PREC MICROPWR SHUNT VLTG REF RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類(lèi)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
LM4040AIZ-5.0/NOPB 制造商:Texas Instruments 功能描述:Voltage Reference
LM4040AIZ-5.0/T4 制造商:Texas Instruments 功能描述:V-Ref Precision 5V 15mA 3-Pin TO-92 Ammo
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