LM4040CIM3X-8.2 National Semiconductor, LM4040CIM3X-8.2 Datasheet - Page 26
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LM4040CIM3X-8.2
Manufacturer Part Number
LM4040CIM3X-8.2
Description
IC VREF PREC MICROPWR SOT23-3
Manufacturer
National Semiconductor
Datasheet
1.LM4040EIM3-2.5NOPB.pdf
(32 pages)
Specifications of LM4040CIM3X-8.2
Reference Type
Shunt
Voltage - Output
8.192V
Tolerance
±0.5%
Temperature Coefficient
100ppm/°C
Number Of Channels
1
Current - Cathode
91µA
Current - Output
15mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
TO-236-3, SC-59, SOT-23-3
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Input
-
Current - Quiescent
-
Other names
*LM4040CIM3X-8.2
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Applications Information
The LM4040 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, the LM4040 is available in the sub-miniature SOT-23
and SC70 surface-mount package. The LM4040 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 LM4040 remains
stable. Reducing design effort is the availability of several
fixed reverse breakdown voltages: 2.048V, 2.500V, 3.000V,
4.096V, 5.000V, 6.000, 8.192V, and 10.000V. The minimum
operating current increases from 60 µA for the LM4040-2.048
and LM4040-2.5 to 100 μA for the LM4040-10.0. All versions
have a maximum operating current of 15 mA.
LM4040s in the SOT-23 packages have a parasitic Schottky
diode between pin 2 (−) and pin 3 (Die attach interface con-
tact). Therefore, pin 3 of the SOT-23 package must be left
floating or connected to pin 2.
LM4040s in the SC70 have a parasitic Schottky diode be-
tween pin 1 (−) and pin 2 (Die attach interface contact).
Therefore, pin 2 must be left floating or connected to pin1.
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 +25°C voltage measured after thermal cycling. The
Typical Applications
FIGURE 1. Shunt Regulator
26
device is thermal cycled to temperature -40°C and then mea-
sured at 25°C. Next the device is thermal cycled to tempera-
ture +125°C and again measured at 25°C. The resulting
V
hysteresis. Thermal hysteresis is common in precision refer-
ences and is induced by thermal-mechanical package 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
external series resistor (R
voltage and the LM4040. R
through the load (I
and supply voltage may vary, R
supply at least the minimum acceptable I
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
enough so that the current flowing through the LM4040 is less
than 15 mA.
R
operating current, (I
breakdown voltage, V
OUT
S
1132315
is determined by the supply voltage, (V
delta shift between the 25°C measurements is thermal
L
) and the LM4040 (I
L
L
R
is at its minimum, R
and I
.
S
) is connected between the supply
S
determines the current that flows
Q
), and the LM4040's reverse
S
should be small enough to
Q
). Since load current
S
Q
S
should be large
to the LM4040
), the load and
(Figure
1) , an