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参数资料
| 型号： | LM4051AEX3-1.2+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC VREF SHUNT PREC 1.225V SC70-3 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 基准类型： | 旁路，精度 |
| 输出电压： | 1.225V |
| 容差： | ±0.1% |
| 温度系数： | 50ppm/°C |
| 通道数： | 1 |
| 电流 - 阴极： | 60µA |
| 电流 - 输出： | 15mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-70，SOT-323 |
| 供应商设备封装： | SC-70-3 |
| 包装： | 带卷 (TR) |
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Pin Description
PIN
1
2
3
NAME
+
?
N.C.
FUNCTION
Positive Terminal of the Shunt Reference
Negative Terminal of the Shunt Reference
No connection. Leave this pin unconnected or connected to pin 2.
Detailed Description
The LM4050/LM4051 shunt references use the
bandgap principle to produce a stable, accurate volt-
age. The device behaves similarly to an ideal zener
diode; a fixed voltage is maintained across its output
terminals when biased with 60μA to 15mA of reverse
current. The LM4050/LM4051 clamps to a voltage of
one diode drop below ground when biased with for-
ward currents up 10mA.
Figure 3 shows a typical operating circuit. The
LM4050/LM4051 are ideal for providing stable refer-
ences from a high-voltage power supply.
Applications Information
The LM4050/LM4051s’ internal pass transistors are used
to maintain a constant output voltage (V SHUNT ) by sinking
the necessary amount of current across a source resistor.
The source resistance (R S ) is determined from the load
current (I LOAD ) range, supply voltage (V S ) variations,
V SHUNT , and desired quiescent current.
Choose the value of R S when V S is at a minimum and I LOAD
is at a maximum. Maintain a minimum I SHUNT of 60μA at all
times. The R S value should be large enough to keep
I SHUNT less than 15mA for proper regulation when V S is
maximum and I LOAD is at a minimum. To prevent damage
to the device, I SHUNT should never exceed 20mA.
Therefore, the value of R S is bounded by the following
equation:
[V S(MIN) - V R ] / [60μA + I LOAD(MAX) ] > R S >
[V S(MAX) - V R ] / [20mA + I LOAD(MIN) ]
Choosing a larger resistance minimizes the total power dis-
sipation in the circuit by reducing the shunt current
(P D(TOTAL) = V S I SHUNT ). Provide a safety margin to
incorporate the worst-case tolerance of the resistor used.
Ensure that the resistor’s power rating is adequate, using
the following general power equation:
PD R = I SHUNT (V S(MAX) - V SHUNT )
Output Capacitance
The LM4050/LM4051 do not require external capacitors
for frequency stability and are stable for any output
capacitance.
Maxim Integrated
V S
I SHUNT + I LOAD
R S
I LOAD
V R
I SHUNT
LM4050
Figure 3. Typical Operating Circuit
Temperature Performance
The LM4050/LM4051 typically exhibit output voltage
temperature coefficients within ±15ppm/°C. The polari-
ty of the temperature coefficients may be different from
one device to another; some may have positive coeffi-
cients, and others may have negative coefficients.
High Temperature Operation
The maximum junction temperature of the LM4050/
LM4051 is +150°C. The maximum operating temperature
for the LM4050/LM4051_E_ is +125°C. At a maximum
load current of 15mA and a maximum output voltage of
5V, the parts dissipate 75mW of power. The power dissi-
pation limits of the 3-pin SC70 call for a derating value of
2.17mW/°C above +70°C and thus for 75mW of power
dissipation, the parts self-heat to 35.56°C above ambient
temperature. If the ambient temperature is +125°C, the
parts operate at 159.56°C, thereby exceeding the maxi-
mum junction temperature value of +150°C. For high-
temperature operation, care must be taken to ensure the
combination of ambient temperature, output power dissi-
pation, and package thermal resistance does not con-
spire to raise the device temperature beyond that listed
in the Absolute Maximum Ratings. Either reduce the out-
put load current or the ambient temperature to keep the
part within the limits.
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4051AIM3-1.2 | 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 |
| LM4051AIM3-1.2 | 制造商:Texas Instruments 功能描述:IC SM PRECISION REFERENCE 0.1% 1.2V |
| LM4051AIM3-1.2/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 |
| LM4051AIM3-1.2/NOPB | 制造商:Texas Instruments 功能描述:Voltage Reference |
| LM4051AIM3-1.2+ | 制造商:Maxim Integrated Products 功能描述:V-REF PRECISION 1.225V 15MA 3PIN SOT-23 - Cut Tape Product |
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