NTE NTE999SM Datasheet
NTE999SM
Integrared Circuit
Programmable Precision Reference
Description:
The NTE999SM integrated circuit is a three–terminal programmable shunt regulator. This monolithic
IC voltage reference operates as a low temperature coefficient zener which is programmable from
to 36 volts with two external resistors. This device exhibits a wide operating current range of 1.0
V
ref
to 100mA with a typical dynamic impedance of 0.22Ω. The characteristics of this reference make it
an excellent replacement for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5 volt reference makes it convenient to obtain a stable reference
from 5.0 volt logic supplies, and since the NTE999SM operates as a shunt regulator, it can be used
as either a positive or negative voltage reference.
Features:
D Programmable Output Voltage to 36 Volts
D Voltage Reference Tolerance: ±1.0%
D Low Dynamic Output Impedance: 0.22Ω Typical
D Sink Current Capability of 1.0 to 100mA
D Equivalent Full Range Temperature Coefficient of 50ppm/°C Typical
D Temperature Compensated for Operation over Full Rated Operating Temperature Range
D Low Output Noise Voltage.
Absolute Maximum Ratings:
Cathode to Anode Voltage, V
Cathode Current Range, Continuous, I
Reference Input Current Range, Continuous, I
Total Power Dissipation (T
Derate Above 25°C 5.8mW/°C
Operating Junction Temperature, T
Operating Ambient Temperature Range, T
Storage Temperature Range, T
Thermal Resistance, Junction–to–Ambient, R
Thermal Resistance, Junction–to–Case, R
(TA = 0° to +70°C, unless otherwise noted.)
KA
K
ref
= +25°C), P
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
D
J
A
thJA
thJC
Lead Temperature (During Soldering, 1/16” ifrom case for 10sec), T
37V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–100 to +150mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–0.05 to +10mA. . . . . . . . . . . . . . . . . . . . . . . . . . . .
725mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0° to +70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
178°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
83°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
L
+260°C. . . . . . . . . . . . . . . . . .
Recommended Operating Conditions Min Max Unit
Cathode to Anode Voltage, V
Cathode Current, I
K
KA
V
ref
36 V
1.0 100 mA
Electrical Characteristics
(TA = +25°C unless otherwise noted)
Characteristic
Reference Input Voltage
V
= V
KA
T
= +25°C
A
, IK = 10mA
ref
Reference Input Voltage Deviation Over
Temperature Range (Note 1, 2)
V
KA
= V
, IK = 10mA
ref
Ratio of Change in Reference Input Voltage
to Change in Cathode to Anode Voltage
I
= 10mA, ∆VKA = 10V to V
K
∆VKA = 36V to 10V
Reference Input Current
I
= 10mA, R1 = 10k, R2 = ∞
K
T
= +25°C
A
T
= T
A
low
to T
(Note 1)
high
Reference Input Current Deviation Over
Temperature Range (Note 1)
I
= 10mA, R1 = 10k, R2 = ∞
K
Minimum Cathode Current for Regulation
V
= V
KA
ref
Off–State Cathode Current
V
= 36V, V
KA
= 0V
ref
Dynamic Impedance (Note 3)
V
KA
= V
, ∆IK = 1.0mA to 100mA
ref
f ≤ 1.0kHz
ref
Symbol Min Typ Max Unit
V
∆V
∆V
∆V
I
∆I
I
I
ref
ref
ref
KA
ref
ref
min
off
2.470 2.495 2.520 V
– 3.0 17 mV
mV/V
–
–
–1.4
–1.0
–2.7
–2.0
µA
–
–
1.8
–
4.0
5.2
– 1.8 4.0 µA
– 0.5 1.0 mA
– 2.6 1000 nA
|Zka| – 0.22 0.5 Ω
Note 1: T
Note 2: The deviation parameter ∆V
= 0°C, T
low
= +70°C
high
is defined as the differences between the maximum
ref
and minimum values obtained over the full operating ambient temperature range
that applies.
∆V
–V
∆T
= V
ref
Min
ref
= T2–T
A
ref
Max
1
Note 2: (cont’d) The average temperature coefficient of the reference input voltage, α V
defined as:
∆V
α V
ref
ppm
°
ref
V
@ 25°C
ref
==
A
x 10
6
∆V
ref
T
∆
(V
A
ref
x 10
@ 25°C)∆T
6
C
α V
can be positive or negative depending on whether V
ref
Min or V
ref
Max occurs at the lower
ref
ambient temperature.
ref
, is
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