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| 型号： | LM4040BIM3-2.1+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC VREF SHUNT PREC 2.048V SOT23 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 基准类型： | 旁路，精度 |
| 输出电压： | 2.048V |
| 容差： | ±0.2% |
| 温度系数： | 100ppm/°C |
| 通道数： | 1 |
| 电流 - 阴极： | 65µA |
| 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： | 标准包装 |
| 产品目录页面： | 1426 (CN2011-ZH PDF) |
| 其它名称： | LM4040BIM3-2.1+TDKR |
LM4040
Improved Precision Micropower Shunt Voltage
Reference 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 LM4040 shunt references use the bandgap princi-
ple to produce a stable, accurate voltage. The device
V S
I SHUNT + I LOAD
behaves similarly to an ideal zener diode; a fixed volt-
age is maintained across its output terminals when
biased with 60μA to 15mA of reverse current. The
R S
I LOAD
V R
LM4040 behaves similarly to a silicon diode when
biased with forward currents up 10mA.
Figure 3 shows a typical operating circuit. The LM4040
is ideal for providing a stable reference from a high-
voltage power supply.
Applications Information
The LM4040’s internal pass transistor is 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 LM4040 does not require an external capacitor for fre-
quency stability and is stable for any output capacitance.
Maxim Integrated
I SHUNT
LM4040
Figure 3. Typical Operating Circuit
Temperature Performance
The LM4040 typically exhibits an output voltage tem-
perature coefficient within ±15ppm/°C. The polarity of
the temperature coefficient may be different from one
device to another; some may have positive coefficients,
and others may have negative coefficients.
High Temperature Operation
The maximum junction temperature of the LM4040 is
+150°C. The maximum operating temperature for the
LM4040_E_ is +125°C. At a maximum load current of 15mA
and a maximum output voltage of 5V, the part will dissipate
75mW of power. The power dissipation 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 part will self-
heat to 35.56°C above ambient temperature. If the ambient
temperature is +125°C, the part operates at 159.56°C,
thereby exceeding the maximum junction temperature
value of +150°C. For high-temperature operation, care must
be taken to ensure the combination of ambient temperature,
output power dissipation and package thermal resistance
does not conspire to raise the device temperature beyond
that listed in the Absolute Maximum Ratings. Either reduce
the output load current or the ambient temperature to keep
the part within the limits.
11
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| LM4040BIM325NOPB | 制造商:Texas Instruments 功能描述:Precision Bulk |
| LM4040BIM3-3.0 | 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 |
| LM4040BIM3-3.0/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 |
| LM4040BIM3-3.0+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| LM4040BIM3-3.0+T | 功能描述:基准电压& 基准电流 uPower Shunt V-Ref w/Mult Brkdwn V 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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