NTE NTE999

NTE999
Integrated Circuit
Adjustable Precision Shunt Regulator
Description:
The NTE999 is a three–terminal adjustable shunt regulator with guaranteed thermal stability over a
temperature range of –0° to +70°C. The output voltage may be set to any value between Vref (approximately 2.5V) and 36V with two external resistors. This device has a typical dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn–on characteristic, making the NTE999
an excellent replacement for zener diodes in many applications.
Features:
D Equivalent Full–Range Temperature Coefficient: 30ppm/°C Typ
D Adjustable Output Voltage
D Fast Turn–On Response
D Sink Current Capability: 1mA to 100mA
D Low Dynamic Output Impedance: 0.2Ω Typ
D Low Output Noise Voltage
Absolute Maximum Ratings: (TA = 0° to +70°C unless otherwise specified)
Cathode Voltage (Note 1), VKA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37V
Continuous Cathode Current Range, IK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –100mA to 150mA
Reference Input Current Range, Iref . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50µA to 10mA
Continuous Power Dissipation, PD
Up to +25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 775mW
Derate Above +25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2mW/°C
Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Lead Soldering Temperature (.0625 (1.6mm) from case for 10s), TL . . . . . . . . . . . . . . . . . . . . . 260°C
Recommended Operating Conditions:
Cathode Voltage, VKA
Min . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vref
Max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V
Cathode Current (For Regulation), IK
Min . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA
Max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
Note 1. Voltage values are with respect to the anode terminal unless otherwise specified.
Electrical Characteristics: (TA = 25°C unless otherwise specified)
Parameter
Symbol
Reference Input Voltage
Vref
Deviation of Reference Input
Voltage
Test Conditions
VKA = Vref, IK = 10mA
Min
Max
Unit
2440 2495 2550
mV
Vref(dev) VKA = Vref, IK = 10mA,
TA = 0° to +70°C
Typ
–
8
17
mV
∆VKA = 10V–Vref
–
–1.4
–2.7
mV
∆VKA = 36V–10V
–
–1.0
–2.0
V
Iref
IK = 10mA, R1 = 10kΩ, R2 = ∞
–
2.0
4.0
µA
Deviation of Reference Input
Current
Iref(dev)
IK = 10mA, R1 = 10kΩ, R2 = ∞
TA = 0° to +70°C
–
0.4
1.2
µA
Minimum Cathode Current for
Regulation
Imin
VKA = Vref
–
0.4
1.0
mA
Off–State Cathode Current
Ioff
VKA = 36V, Vref = 0
–
0.1
1.0
µA
VKA = Vref, IK = 1mA to 100mA
f ≤ 1kHz
–
0.2
0.5
Ω
Ratio of Change in Reference
Input Voltage to the Change in
Cathode Voltage
∆Vref
∆VKA
∆
Reference Input Current
Dynamic Impedance
|zak|
IK = 10mA
.135 (3.45) Min
.210
(5.33)
Max
Seating Plane
.021 (.445) Dia Max
.500
(12.7)
Min
Ref
K
A
.100 (2.54)
.050 (1.27)
.165
(4.2)
Max
.105 (2.67) Max
.105 (2.67) Max
.205 (5.2) Max