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参数资料
| 型号： | LM4041DIM3-ADJX |
| 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, 1.233 V, PDSO3 |
| 封装： | PLASTIC, TO-236AB, SOT-23, 3 PIN |
| 文件页数： | 5/19页 |
| 文件大小： | 774K |
| 代理商： | LM4041DIM3-ADJX |
Applications Information
The LM4041 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, the LM4041 is available in the sub-miniature SOT-23
and SC70 surface-mount package. The LM4041 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 LM4041 remains
stable. Design effort is further reduced with the choice of
either a fixed 1.2V or an adjustable reverse breakdown
voltage. The minimum operating current is 60 A for the
LM4041-1.2 and the LM4041-ADJ. Both versions have a
maximum operating current of 12 mA.
LM4041s using the SOT-23 package have pin 3 connected
as the (-) output through the package’s die attach interface.
Therefore, the LM4041-1.2’s pin 3 must be left floating or
connected to pin 2 and the LM4041-ADJ’s pin 3 is the (-)
output.
LM4041s using the SC70 package have pin 2 connected as
the () output through the packages’ die attach interface.
Therefore, the LM4041-1.2’s pin 2 must be left floating or
connected to pin 1, and the LM4041-ADJ’s pin 2 is the ()
output.
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 LM4041. R
S determines the current that
flows through the load (I
L) and the LM4041 (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
LM4041 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
LM4041 is less than 12 mA.
R
S should be selected based on the supply voltage, (VS), the
desired load and operating current, (I
L and IQ), and the
LM4041’s reverse breakdown voltage, V
R.
The LM4041-ADJ’s output voltage can be adjusted to any
value in the range of 1.24V through 10V. It is a function of the
internal reference voltage (V
REF) and the ratio of the external
feedback resistors as shown in Figure 2 . The output voltage
is found using the equation
V
O =VREF[(R2/R1) + 1]
(1)
where V
O is the output voltage. The actual value of the
internal V
REF is a function of VO. The “corrected” VREF is
determined by
V
REF =
V
O (
V
REF/
V
O)+VY
(2)
where
V
Y = 1.240 V
and
V
O =(VO VY)
V
REF/
V
O is found in the Electrical Characteristics and is
typically 1.55 mV/V. You can get a more accurate indication
of the output voltage by replacing the value of V
REF in
equation (1) with the value found using equation (2).
Note that the actual output voltage can deviate from that
predicted using the typical value of
V
REF/
V
O in equation
(2): for C-grade parts, the worst-case
V
REF/
V
O is 2.5
mV/V. For D-grade parts, the worst-case
V
REF/
V
O is 3.0
mV/V.
Typical Applications
01139222
FIGURE 1. Shunt Regulator
01139234
V
O =VREF[(R2/R1) + 1]
FIGURE 2. Adjustable Shunt Regulator
LM4041
www.national.com
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PDF描述 |
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| LM4041EEM3-1.2X | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PDSO3 |
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| LM4041EIM3-1.2X | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PDSO3 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4041DIM3X-1.2 | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM4041DIM3X-1.2/NOPB | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM4041DIM3X12 | 制造商:NATIONAL 功能描述:* |
| LM4041DIM3XADJ | 制造商:NATIONAL 功能描述:New |
| LM4041DIM3X-ADJ | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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