PJ1431
Programmable Precision References
1-9
2002.ver.A
he PJ1431 integrated circuits are three-terminal
programmable shunt regulator diodes. These
monolithic IC voltage references operate as a low
temperature coefficient zener which is programmable
from Vref to 36 volts with two external resistors. These
devices exhibit a wide operating current range of 1.0 to
100mA with a typical dynamic impedance of
0.22
.The characteristics of these references make
Programmable Output Voltage to 36 Volts
Low Dynamic Output Impedance, 0.22 Type
Sink Current Capability of 1.0 to 100 mA
Equivalent Full-Range Temperature
Coefficient of 50 ppm/
Typical
Temperature Compensated for Operation over
Full Rated Operating Temperature Range
Low Output Noise Voltage
them excellent replacements 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 PJ1431 operates as a shunt
regulator, it can be used as either a positive or negative
tage reference.
Device Operating
Temperature
(Ambient)
Package
PJ1431CX -20+85 SOT-23
T
Rating
Symbol
Value
Unit
Cathode To Anode Voltage
V
KA
37 V
Cathode Current Range, Continuous
I
K
-100 to +150
mA
Reference Input Current Range, Continuous
I
ref
-0.05 to +10
mA
Operating Junction Temperature
T
J
150
Operating Ambient Temperature Range
T
A
-20 to +85
Storage Temperature Range
T
stg
-65 to +150
Total Power Dissipation @ T
A
= 25
Derate above 25 Ambient Temperature PJ1431CX
P
D
0.30 W
Total Power Dissipation @ T
C
= 25
Derate above 25
Case Temperature PJ1431CX
P
D
0.7 W
CIRCUIT SCHEMATIC
MAXIMUM RATINGS
(Full operating ambient temperature range applies unless otherwise noted.)
QRDERING INFORMATION
SOT-23
FEATURES
Pin: 1. Cathode
2. Reference
3. Anode
PJ1431
Programmable Precision References
2-9
2002.ver.A
Characteristics
Symbol
Min
Max
Unit
Thermal Resistance, Junction to Ambient
R
JA
178
114
/W
Thermal Resistance, Junction to Case
R
JC
83
41
/W
Condition/Value
Symbol
Min
Max
Unit
Cathode To Anode Voltage
V
KA
V
ref
36
V
Cathode Current
I
K
1.0
100
mA
PJ1431
Characteristic
Symbol Min Typ Max Unit
Reference Input Voltage (Figure 1)
V
KA
= V
ref
, I
K
= 10 mA
T
A
= +25
T
A
= T
low
to T
high
(Note 1)
V
ref
2.475
2.458
2.500
--
2.525
2.542
V
Reference Input Voltage Deviation Over
Temperature Range (Figure 1, Note 1,2,4)
V
KA
= V
ref
, I
K
= 10 mA
V
ref
-- 3.0 17 mV
Ratio of Change in Reference Input Voltage
to Change in Cathode to Anode Voltage
I
K
= 10 mA (Figure 2),
V
KA
= 10V to V
ref
V
KA
= 36V to 10V
kA
ref
V
V
--
--
- 1.4
- 1.0
- 2.7
-.2.0
mV
Reference Input Current (Figure 2)
I
K
= 10 mA, R1 = 10 k, R2 =
T
A
= +25
T
A
= T
low
to T
high
(Note 1)
I
ref
--
--
0.7
--
4.0
5.2
A
Reference Input Current Deviation Over
Temperature Range (Figure 2, Note 1,4)
I
K
= 10 mA, R1 = 10 k, R2 =
I
ref
-- 0.4 1.2 A
Minimum Cathode Current for Regulation
V
KA
= V
ref
(Figure 1)
I
min
-- 0.5 1.0
mA
Off-State Cathode Current (Figure 3)
V
KA
= 36 V, V
ref
= 0V
I
off
-- 2.6
1000
nA
Dynamic Impedance (Figure 1, Note 3)
V
KA
= V
ref
,
I
K
= 1.0 mA to 100 mA, f
1.0 kHz
|
Z
ke
|
--
0.22
0.5
THERMAL CHARACTERISTICS
RECOMMENDED OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS
( Ambient temperature at 25 unless otherwise noted
)
PJ1431
Programmable Precision References
3-9
2002.ver.A
T
low
= -20
, T
high
= +85
The deviation parameter V
ref
is defined as the
differences between the maximum and minimum values
obtained over the full operating ambient temperature range
the applies.
The average temperature coefficient of the reference input
voltage,
V
ref
, is defined as :
)
C
25
@
V
(
T
10
V
10
T
C
25
@
V
)
V
(
C
ppm
V
ref
A
6
ref
6
A
ref
ref
ref
=
=
V
ref
can be positive of negative depending on whether
V
ref
Min of V
ref
Max occurs at the lower ambient temperature.
(Refer to Figure 6)
Example: V
ref
= 8.0 mV and slope is positive,
V
ref
@ 25
= 2.5V, T
A
= 85
C
/
ppm
8
.
45
)
5
.
2
(
70
10
008
.
0
V
6
ref
=
=
The dynamic impedance Z
ka
is defined as:
K
KA
ka
I
V
Z
=
When the device is programmed with two external
resistors, R1 and R2, (refer to Figure 2) the total dynamic
impedance of the circuit is defined as:
+
2
1
ka
ka
R
R
1
Z
Z
This test is not applicable to surface mount (D suffix) devices.
FIGURE 1 -- TEST CIRCUIT FOR V
KA
= v
ref
FIGURE 2 -- TEST CIRCUIT FOR V
KA
> V
ref
1
ref
2
1
ref
kA
R
I
R
R
1
V
V
+
+
=
FIGURE 3 -- TEST CIRCUIT FOR I
off
3
4
2
1
PJ1431
Programmable Precision References
4-9
2002.ver.A
FIGURE 4-CATHODE CURRENT versus CATHODE
VOLTAGE
FIGURE 6-REFERENCE INPUT VOLTAGE versus
AMBIENT TEMPERATURE
FIGURE 8-CHANGE IN REFERENCE INPUT
VOLTAGE versus CATHODE VOLTAGE
FIGURE 5-CATHODE CURRENT versus CATHODE
VOLTAGE
FIGURE 7-REFERENCE INPUT CURRENT versus
AMBIENT TEMPERATURE
FIGURE 9 OFF.STATE CATHODE CURRENT versus
AMBIENT TEMPERATURE
PJ1431
Programmable Precision References
5-9
2002.ver.A
FIGURE 10 - DYNAMIC IMPEDANCE
VERSUS
FREQUENCY
FIGURE 12 - OPEN LOOP VOLTAGE GAIN
VERSUS
FREQUENCY
FIGURE 14 - PULSE RESPONSE
FIGURE 11 - DYNAMIC IMPEDANCE
VERSUS
AMBIENT TEMPERATURE
FIGURE 13 - SPECTRAL NOISE DENSITY
FIGURE 15 - STABILITY BOUNDARY CONDITIONS
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