PJ431/PJ431A/PJ431B
Programmable Precision References
1-11
2003/01
rev.A
he PJ431, A, B 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
them excellent
replacements
for
zener
Programmable Output Voltage to 36 Volts
Voltage Reference Tolerance:
PJ431A :
0.5%, Typ@25C
PJ431 :
1%, Typ@25C
PJ431B :
2%, Typ@25C
Low Dynamic Output Impedance, 0.22 Typical
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
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 PJ431, A, B operates as a shunt
regulator, it can be used as either a positive or negative tage
reference.
T
Device Operating
Temperature
(Ambient)
Package
PJ431/ A/ B CT
TO-92
PJ431/ A/ B CS
SOP-8
PJ431/ A/ B CY
SOT-89
PJ431/ A/ B CX
- 20~ +85
SOT-23
CIRCUIT SCHEMATIC
QRDERING INFORMATION
FEATURES
BLOCK DIAGRAM
Pin: 1. Reference
2. Anode
3. Cathode
Pin: 1. Cathode
2. Anode
3. Anode
4. N.C.
5. N.C.
6. Anode
7. Anode
8. Reference
SOP-8 is an internally modified SOP-8 Package. Pins 2,3,6
and 7 are electrically common to the die attach flag. This
internal lead frame modification decreases package thermal
resistance and increases power dissipation capability when
appropriately mounted on a printed on a printed circuit board.
SOP-8 conforms to all external dimensions of the standard
SOP-8 Package
.
TO-92
SOT-89
SOT-23
SOP-8
Pin: 1. Reference
2. Cathode
3. Anode
(Heatsink surface
connected to Pin 2)
Pin: 1. Reference
2. Anode
3. Cathode
PJ431/PJ431A/PJ431B
Programmable Precision References
2-11
2003/01
rev.A
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
PJ431 / 431A / 431B CT
PJ431 / 431A / 431B CS
PJ431 / 431A /431 B CY
PJ431 / 431A / 431B CX
P
D
0.625
0.70
0.80
0.30
W
Total Power Dissipation @ T
C
= 25
Derate above 25
Case Temperature
PJ431 / 431A / 431B CT
PJ431 / 431A / 431B CS
PJ431 / 431A /431 B CY
PJ431 / 431A / 431B CX
P
D
1.5
1.5
1.5
0.7
W
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
MAXIMUM RATINGS
(Full operating ambient temperature range applies unless otherwise noted.)
THERMAL CHARACTERISTICS
RECOMMENDED OPERATING CONDITIONS
PJ431/PJ431A/PJ431B
Programmable Precision References
3-11
2003/01
rev.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 :
(vref )
ppm Vref@25 Vref x 10
6
Vref = =
T
A
T
A
(Vref@25
)
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
0.008
10
6
V
ref
= = 45.8 ppm/
70(2.5)
The dynamic impedance Z
ka
is defined as:
V
KA
| Z
ka
| =
I
K
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:
R1
| Z
ka
|
| Z
ka
| ( 1 + )
R2
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
R1
V
KA
= V
ref
( 1+ ) + I
ref
R1
R2
FIGURE 3 -- TEST CIRCUIT FOR I
off
x1
0
6
1
2
3
4
PJ431/PJ431A/PJ431B
Programmable Precision References
4-11
2003/01
rev.A
PJ431
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)
PJ431A
PJ431
PJ431B
V
ref
2.4875
2.475
2.45
2.495
2.495
2.495
2.5125
2.525
2.55
V
Reference Input Voltage Deviation Over
Temperature Range (Figure 1, Note 1,2,4)
V
KA
= V
ref
, I
K
= 10 mA
Vref
-- 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
Vref
V
KA
--
--
- 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 =
l
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
ELECTRICAL CHARACTERISTICS
( Ambient temperature at 25 unless otherwise noted
)
PJ431/PJ431A/PJ431B
Programmable Precision References
5-11
2003/01
rev.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
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