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参数资料
| 型号： | LM4040CIZ-8.2/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 8.192 V, PBCY3 |
| 封装： | PLASTIC, TO-92, 3 PIN |
| 文件页数： | 18/31页 |
| 文件大小： | 752K |
| 代理商： | LM4040CIZ-8.2/NOPB |
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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: 2.048V, 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 A 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
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
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| LM4040CIM7-3.0/NOPB | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 3 V, PDSO5 |
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| LM4040EIZ-3.0/NOPB | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 3 V, PBCY3 |
| LM4040DIM7-2.0/NOPB | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.048 V, PDSO5 |
| LM4040DIZ-3.0/NOPB | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 3 V, PBCY3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4040CS8-2.5 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference |
| LM4040CSD-250GT3 | 制造商:ON Semiconductor 功能描述:SHUNT VOLTAGE REFERENCE - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / SHUNT VOLTAGE REFERENCE |
| LM4040CSD-300GT3 | 制造商:ON Semiconductor 功能描述:SHUNT VOLTAGE REFERENCE - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / SHUNT VOLTAGE REFERENCE |
| LM4040CSD-330GT3 | 制造商:ON Semiconductor 功能描述:SHUNT VOLTAGE REFERENCE - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / SHUNT VOLTAGE REFERENCE |
| LM4040CSD-409GT3 | 制造商:ON Semiconductor 功能描述:SHUNT VOLTAGE REFERENCE - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / SHUNT VOLTAGE REFERENCE |
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