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LM4041BEM3-1.2-T Fiches technique(PDF) 5 Page - Maxim Integrated Products

No de pièce LM4041BEM3-1.2-T
Description  Improved Precision Micropower Shunt Voltage Reference
Download  7 Pages
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

LM4041BEM3-1.2-T Fiches technique(HTML) 5 Page - Maxim Integrated Products

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Detailed Description
The LM4041 shunt references use the bandgap princi-
ple to produce a stable, accurate voltage. The device
behaves similarly to an ideal zener diode; a fixed volt-
age of +1.225V is maintained across its output termi-
nals when biased with 60µA to 12mA of reverse
current. The LM4041 behaves similarly to a silicon
diode when biased with forward currents up 10mA.
Figure 3 shows a typical operating circuit. The LM4041
is ideal for providing a stable reference from a high-
voltage power supply.
Applications Information
The LM4041’s internal pass transistor is used to main-
tain a constant output voltage (VSHUNT) by sinking the
necessary amount of current across a source resistor.
The source resistance (RS) is determined from the load
current (ILOAD) range, supply voltage (VS) variations,
VSHUNT, and desired quiescent current.
Choose the value of RS when VS is at a minimum and
ILOAD is at a maximum. Maintain a minimum ISHUNT of
60µA at all times. The RS value should be large enough
to keep ISHUNT less than 12mA for proper regulation
when VS is maximum and ILOAD is at a minimum. To
prevent damage to the device, ISHUNT should never
exceed 20mA.
Therefore, the value of RS is bounded by the following
equation:
[VS(MIN) - VR ] / [60µA + ILOAD(MAX)] > RS >
[VS(MAX) - VR ] / [20mA + ILOAD(MIN)]
Choosing a larger resistance minimizes the total power
dissipation in the circuit by reducing the shunt current
(PD(TOTAL) = VS ISHUNT). Provide a safety margin to
incorporate the worst-case tolerance of the resistor
used. Ensure that the resistor’s power rating is ade-
quate, using the following general power equation:
PR = ISHUNT (VS(MAX) - VR)
Output Capacitance
The LM4041 does not require an external capacitor for
frequency stability and is stable for any output capaci-
tance.
Temperature Performance
The LM4041 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.
Improved Precision Micropower
Shunt Voltage Reference
_______________________________________________________________________________________
5
Pin Description
PIN
NAME
FUNCTION
1
+
Positive Terminal of the Shunt Reference
2
Negative Terminal of the Shunt Reference
3
N.C.
Leave this pin unconnected, or connect to pin 2.
Figure 3. Typical Operating Circuit
LM4041
ILOAD
ISHUNT
RS
VS
VR
ISHUNT + ILOAD


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