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Shunt Regulator. SPX2431L Datasheet |
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®
SPX2431L
Precision Adjustable Shunt Regulator
FEATURES
■ Trimmed Bandgap to 0.5% and 1.0%
■ Wide Operating Current 160µA to 100mA
■ Extended Temperature Range:
0°C to 105°C
■ Low Temperature Coefficient 30 ppm/°C
■ Offered in TO-92, SOIC, SOT-23-3
■ Replacement for TL431 and AS2431L
■ Low Cost Solution
APPLICATIONS
■ Battery Operating Equipment
■ Adjustable Supplies
■ Switching Power Supplies
■ Error Amplifiers
■ Single Supply Amplifier
■ Monitors / VCRs / TVs
■ Personal Computers
DESCRIPTION
The SPX2431L is a 3-terminal adjustable shunt voltage regulator providing a highly accurate
bandgap reference (0.5%) and extremely low operating current (100µA). The SPX2431L acts
as an open-loop error amplifier with a 2.5V temperature compensated reference. The
SPX2431L's thermal stability, wide operating current (100mA) and temperature range (0°C to
150°C) makes it suitable for a variety of applications. SPX2431LA tolerance of 0.5% is proven
to be sufficient to overcome all the other errors in the system to virtually eliminate the need for
trimming in the power supply manufacturer's assembly lines and contributes a significant cost
savings.
In the standard shunt configuration, the combination of a low temperature coefficient, sharp
turn on characteristics, low output impedance, and programmable output voltage makes this
precision reference an excellent error amplifier. The SPX2431L is available in TO-92, SOIC-8,
and SOT-23-3 package.
BLOCK DIAGRAM
Cathode (K)
Reference
(R)
Rev. 08/13/02
2.5V
+
-
Anode (A)
SPX2431L Precision Adjustable Shunt Regulator
1
© Copyright 2002 Sipex Corporation
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ABSOLUTE MAXIMUM RATINGS
Cathode-Anode Reverse Breakdown V ....................................... 20V
KA
Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A
Operating Cathode Current IKA .................................................. 100mA
Reference Input Current I ....................................................... 1.0mA
REF
Continuos Power Dissipation at 25°C PD
TO-92 ..................................................................... 775mW
SOT-23 .................................................................. 200 mW
SOIC-8 .................................................................... 750mW
Junction Temperature
T
J
...........................................................
150
°C
Storage Temperature TSTG .............................................. -65 to 150 °C
Lead Temperature (Soldering 10 sec.) TL .................................. 300°C
NOTE: Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other
conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating condi-
tions for extended periods may affect reliability.
RECOMMENDED CONDITIONS
PARAMETER
Cathode Voltage
Cathode Current
SYMBOL
VKA
IK
RATING
VREF to 20
10
UNIT
V
mA
TYPICAL THERMAL RESISTANCES
PACKAGE 0JA
0JC TYPICAL DERATING
TO-92 160°C/W 80°C/W
6.3 mW/°C
SOT-23 575°C/W 150°C/W 1.7 mW/°C
SOIC-8 175°C/W 45°C/W
5.7 mW/°C
Typical deratings of the thermal resistances are given for ambient
temperature >25°.
ELECTRICAL CHARACTERISTICS
Electrical characteristics at 25°C IK = 10mA VK = VREF, unless otherwise specified.
PARAMETER
SYMBOL FIGURE CONDITIONS
Reference Voltage
VREF
∆VREF withTemp.*
Ratio of Change in VREF
to Cathode Voltage
Reference Input Current
IREF Temp Deviation
Min IK for Regulation
Off State Leakage
TC
∆ VREF
∆VK
IREF
∆IREF
IK(MIN)
IK(OFF)
Dynamic Output
Impedance
ZKA
2
2 TJ = 0°C to 150°C
2
VREF to 10V
3 10V to 20V
3
3 TJ = 0°C to 105°C
2
4 VREF = 0V,
VKA = 20V
2 ƒz ≤ 1kHz
IK = 0.16 to 100mA
Operating Range (TJ ) = -40°C to 125°C.
* See appropiate test circuit (Figure 2)
MIN TYP MAX MIN TYP MAX UNITS
SPX2431LA
SPX2431
2.490
2.469
-2.7
-2.0
2.503
0.07
-1.01
-0.4
2.515
2.536
0.20
0.3
2.470
2.449
-2.7
-2.0
2.495
0.07
-1.01
-0.4
2.520
2.541
0.20
0.3
V
V
mV/°C
mV/V
0.7 4.0
0.4 1.2
160
0.04 500
0.7 4.0 µA
0.4 1.2 µA
160 µA
0.04 500 nA
0.15 0.5
0.15 0.5 Ω
Rev. 08/13/02
SPX2431L Precision Adjustable Shunt Regulator
2
© Copyright 2002 Sipex Corporation
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CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
ppm %
00
mV
0
5000 0.5
-10
∆VREF
∆T
0 15 30 45 60 75 90 105
Junction Temperature (°C)
0.07 mV/°C
0.003 %/°C
27 ppm/°C
Figure 1. VREF VS Temperature.
• TC in mV/°C = ∆VREF (mV)
∆TA
( )• TC in %/°C =
∆VREF
∆VREF at 25°C
x 100
∆TA
( )• TC in ppm/°C =
∆VREF
∆VREF at 25°C
x 106
∆TA
TEST CIRCUITS
VIN VKA = VREF
VIN
VKA
VIN
IREF
IK
R1
IREF
IK
(VREF)
R2
VKA
IK (OFF)
Figure 2. Test Circuit for VKA = VREF Figure 3. Test Circuit for VKA > VREF Figure 4. Test Circuit for IKOFF
Rev. 08/13/02
SPX2431L Precision Adjustable Shunt Regulator
3
© Copyright 2002 Sipex Corporation
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