Datasheet

LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
7
Maxim Integrated
Note 1: All devices are 100% production tested at T
A
= +25°C and are guaranteed by design for T
A
= T
MIN
to T
MAX
, as specified.
Note 2: The overtemperature limit for Reverse Breakdown Voltage Tolerance is defined as the room-temperature Reverse
Breakdown Voltage Tolerance ±[(∆V
R
/∆T)(max∆T)(V
R
)], where ∆V
R
/∆T is the V
R
temperature coefficient, max∆T is the maxi-
mum difference in temperature from the reference point of +25°C to T
MIN
or T
MAX
, and V
R
is the reverse breakdown volt-
age. The total overtemperature tolerance for the different grades in the temperature range where max∆T = +65°C is shown
below:
A grade: ±0.75% = ±0.1% ±100ppm/°C

65°C
B grade: ±0.85% = ±0.2% ±100ppm/°C

65°C
C grade: ±1.15% = ±0.5% ±100ppm/°C

65°C
D grade: ±1.98% = ±1.0% ±150ppm/°C

65°C
The total over-temperature tolerance for the different grades in the extended temperature range where max ∆T = +100°C is
shown below:
A grade: ±1.1% = ±0.1% ±100ppm/°C

100°C
B grade: ±1.2% = ±0.2% ±100ppm/°C

100°C
C grade: ±1.5% = ±0.5% ±100ppm/°C

100°C
D grade: ±2.5% = ±1.0% ±150ppm/°C

100°C
Therefore, as an example, the A-grade LM4040-2.5 has an over-temperature reverse breakdown voltage tolerance of ±2.5V

0.75% = ±19mV.
Note 3: Guaranteed by design.
ELECTRICAL CHARACTERISTICS—5.000V
(I
R
= 100µA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LM4040A (0.1%) 4.995 5.000 5.005
LM4040B (0.2%) 4.990 5.000 5.010
LM4040C (0.5%) 4.975 5.000 5.025
Reverse Breakdown Voltage V
R
T
A
= +25°C
LM4040D (1.0%) 4.950 5.000 5.050
V
LM4040A ±5.0 ±38
LM4040B ±10 ±43
LM4040C ±25 ±58
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040D ±50 ±99
mV
LM4040A/B/C 54 80
Minimum Operating Current I
RMIN
LM4040D 54 85
µA
I
R
= 10mA ±30
LM4040A/B/C ±20 ±100
I
R
= 1mA
LM4040D ±20 ±150
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆V
R
/∆T
I
R
= 100µA ±15
ppm/°C
LM4040A/B/C 0.5 1.4
I
RMIN
≤ I
R
≤ 1mA
LM4040D 0.5 1.8
LM4040A/B/C 3.5 12.0
Reverse Breakdown Voltage
Change with Operating
Current Change
1mA ≤ I
R
≤ 15mA
LM4040D 3.5 15.0
mV
LM4040A/B/C 0.5 1.1
Reverse Dynamic
Impedance (Note 3)
Z
R
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R LM4040D 0.5 1.5
Ω
Wideband Noise e
N
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz 80 µV
RMS
Reverse Breakdown Voltage
Long-Term Stability
∆V
R
T = 1000h 120 ppm