參數(shù)資料
型號(hào)： LM4040EIM7-2.0/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.048 V, PDSO5
封裝： PLASTIC, SC-70, 5 PIN
文件頁(yè)數(shù)： 18/31頁(yè)
文件大?。?/td> 752K
代理商： LM4040EIM7-2.0/NOPB
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-
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
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.
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
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
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
01132315
FIGURE 1. Shunt Regulator
LM4040
www.national.com
25
相關(guān)PDF資料
PDF描述
LM4040DIM7-3.0/NOPB 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 3 V, PDSO5
LM4040DIM7X-2.5/NOPB 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO5
LM4040CIM3X-2.0/NOPB 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.048 V, PDSO3
LM4040DIM3X-8.2/NOPB 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 8.192 V, PDSO3
LM4040CIM7X-2.0/NOPB 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.048 V, PDSO5
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4040EIM7-3.0 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LM4040EIM7-3.0/NOPB 制造商:Texas Instruments 功能描述:V-Ref Precision 3V 15mA 5-Pin SC-70 T/R 制造商:OC White Company 功能描述:V-Ref Precision 3V 15mA 5-Pin SC-70 T/R
LM4040EIM7X-2.5/NOPB 功能描述:IC VREF SHUNT PREC 2.5V SC-70-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 基準(zhǔn)類型:旁路，精度 輸出電壓:5V 容差:±0.5% 溫度系數(shù):100ppm/°C 輸入電壓:- 通道數(shù):1 電流 - 陰極:80µA 電流 - 靜態(tài):- 電流 - 輸出:15mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商設(shè)備封裝:SOT-23-3 包裝:帶卷 (TR) 其它名稱:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND
LM4040EIMX-2.5 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
LM4040EIZ-2.0/NOPB 功能描述:IC VREF SHUNT PREC 2.048V TO92-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 基準(zhǔn)類型:旁路，精度 輸出電壓:5V 容差:±0.5% 溫度系數(shù):100ppm/°C 輸入電壓:- 通道數(shù):1 電流 - 陰極:80µA 電流 - 靜態(tài):- 電流 - 輸出:15mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商設(shè)備封裝:SOT-23-3 包裝:帶卷 (TR) 其它名稱:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND
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