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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: 2.500V, 4.096V, 5.000V, 8.192V, and
10.000V. The minimum operating current increases from
60 A for the LM4050-2.5 to 100 A for the LM4050-10.0. All
versions have a maximum operating current 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
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 LM4050. R
S determines the current that
flows through the load (I
L) and the LM4050 (IQ). Since load
current and supply voltage may vary, R
S should be small
enough to supply at least the maximum guaranteed I
RMIN
(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
L is at its
minimum, R
S should be large enough so that the current
flowing through the LM4050 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 LM4050’s reverse
breakdown voltage, V
R.
Typical Applications
10104515
FIGURE 1. Shunt Regulator
LM4050
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相关PDF资料
LM4050BI-5MDA 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, UUC
LM4050BIM3-2.5+T 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO3
LM4050AIM3-4.1+T 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 4.096 V, PDSO3
LM4051BIM3-1.2+T 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PDSO3
LM4050BIX3-5.0+T 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PDSO3
LM4050BIM3-2.1+T 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.048 V, PDSO3
LM4050BIM3-3.0+T 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 3 V, PDSO3
LM4051CIM3-1.2+T 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PDSO3
相关代理商/技术参数
LM4050AIM3-10 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
LM4050AIM3-10/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
LM4050AIM3-10/NOPB 制造商:Texas Instruments 功能描述:, Voltage Reference Type:Shunt, Referenc
LM4050AIM3-2.0/NOPB 功能描述:IC VREF SHUNT PREC 2.048V SOT23 RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:5V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:80µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:TO-236-3，SC-59，SOT-23-3 供应商设备封装:SOT-23-3 包装:带卷 (TR) 其它名称:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND
LM4050AIM3-2.1 制造商:Maxim Integrated Products 功能描述:50PPM/+C PRECISION MICROPOWER SHUNT - Rail/Tube
LM4050AIM3-2.1+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
LM4050AIM3-2.1+T 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
LM4050AIM3-2.1-T 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