SIPEX SPX2431M

SPX2431
®
Precision Adjustable Shunt Regulator
FEATURES
■ Trimmed Bandgap to 0.5% and 1.0%
■ Wide Operating Current 1mA to 100mA
■ Extended Temp. Range: 0°C to 105°C
■ Low Temperature Coefficient 30 ppm/°C
■ Offered in 3 Pin SOT-23 (M)
■ Replacement for TL431, AS2431
■ Low Noise Output
APPLICATIONS
■ Battery Operating Equipment
■ Adjustable Supplies
■ Switching Power Supplies
■ Error Amplifiers
■ Single Supply Amplifier
■ Monitors / VCRs / TVs
■ Personal Computers
DESCRIPTION
The SPX2431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate
bandgap reference. The SPX2431 acts as an open-loop error amplifier with a 2.5V temperature
compensation reference. The SPX2431’s thermal stability, wide operating current (100mA) and
temperature range (0°C to 105°C) makes it suitable for a variety of applications that require a
low cost, high performance solution. SPX2431A tolerance of 0.5% is proven to be sufficient to
overcome all of the other errors in the system to virtually eliminate the need for trimming in the
power supply manufacturer's assembly line and contribute a significant cost savings.
The output voltage may be adjusted to any value between VREF and 20 volts with two external
resistors. 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 SPX2431 is available in SOT-23-3
package.
FUNCTIONAL DIAGRAM
Cathode (K)
Reference
(R)
+
2.5V
Anode (A)
Date: 05/25/04
SPX2431 Precision Adjustable Shunt Regulator
1
© Copyright 2003 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
Cathode-Anode Reverse Breakdown VKA ....................................... 20V
Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A
Operating Cathode Current IKA .................................................. 100mA
Reference Input Current IREF ....................................................... 1.0mA
Continuos Power Dissipation at 25°C PD
SOT-23 .................................................................. 200 mW
Junction Temperature TJ ........................................................... 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 conditions for extended periods may affect reliability.
RECOMMENDED CONDITIONS
TYPICAL THERMAL RESISTANCES
PARAMETER
SYMBOL
RATING
UNIT
Cathode Voltage
VKA
VREF to 20
V
Cathode Current
IK
10
mA
PACKAGE
SOT-23
0JA
0JC
TYPICAL DERATING
575°C/W 150°C/W
1.7 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
MIN
TYP
MAX
MIN
SPX2431A
Reference Voltage
∆VREF withTemp.*
Ratio of Change in VREF
to Cathode Voltage
VREF
TC
2
2
3
Reference Input Current
IREF
3
IREF Temp Deviation
∆IREF
3
Min IK for Regulation
IK(MIN)
2
Off State Leakage
IK(OFF)
4
Date: 05/25/04
ZKA
2.487
2.480
2.500
2.513
2.520
0.07
0.20
-2.7
-2.0
-1.01
-0.4
2
∆ VREF
∆VK
Dynamic Output
Impedance
TJ = 0°C to 105°C
2
VREF to 10V
10V to 20V
TJ = 0°C to 105°C
MAX
UNITS
0.3
2.474
2.460
2.500
2.526
2.540
V
V
0.07
0.20
mV/°C
-2.7
-2.0
-1.01
-0.4
0.3
mV/V
0.7
4.0
0.7
4.0
µA
0.4
1.2
0.4
1.2
µA
0.4
1.0
0.4
1.0
mA
0.04
500
nA
0.15
0.5
Ω
VREF = 0V,
VKA = 20V
0.04
ƒz ≤ 1kHz
IK = 1 to 100mA
0.15
SPX2431 Precision Adjustable Shunt Regulator
2
TYP
SPX2431
0.5
© Copyright 2004 Sipex Corporation
CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
ppm
0
%
mV
0
0
∆VREF(mV)
∆TA
• TC in mV / °C =
∆VREF
∆T
• TC in % / °C =
-5
5000
(
∆VREF
∆VREF at 25°C
0
15
30
45
60
75
90
105
x 100
∆ TA
0.5
• TC in ppm / °C =
)
(
∆VREF
∆VREF at 25°C
)
x 106
∆TA
Junction Temperature (°C)
0.0033mV /°C
0.0027% / °C
27ppm/°C
Figure 1. VREF VS Temperature
TEST CIRCUITS
VIN
VKA = VREF
VIN
VKA
VIN
VKA
IK (OFF)
IREF
IK
R1
IREF
IK
(VREF)
R2
Figure 2. Test Circuit for VKA = VREF
Date: 05/25/04
Figure 3. Test Circuit for VKA > VREF
SPX2431 Precision Adjustable Shunt Regulator
3
Figure 4. Test Circuit for IKOFF
© Copyright 2003 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
2.53
150
125
VREF Reference Voltage (V)
IK Cathode Current (mA)
75
50
25
0
-25
-50
2.51
2.50
2.49
2.48
2.47
2.46
-75
-100
-2
-1
0
1
2
VKA Cathode Voltage (V)
2.45
-60
3
-30
0
30
60
90
120
TA Ambient Temperature (°C)
Figure 6. Reference Voltage VS Ambient Tempetature
Figure 5. High Current Operating Characteristics
900
3.0
800
IREF Reference Input Current (µA)
VKA = VREF
0° to 105°C
700
IK Cathode Current (µA)
VKA = VREF
IK = 10mA
2.52
VKA = VREF
0°C to 105°C
100
600
500
400
105°C
300
25°C
200
-0°C
100
0
-100
-200
-1.0
0
1.0
2.0
VKA Cathode Voltage (V)
R1 = 10kΩ
R2 = ∞
IK = 10mA
2.5
2.0
1.5
1.0
0.5
0
-60
3.0
-30
0
30
60
90
120
TA Ambient Temperature (°C)
Figure 8. Reference Input Current VS Ambient
Temperature
Figure 7. Low Current Operating Characteristics
70
0
60
Noise Voltage n/√Hz
-10
∆VREF (mV)
0°C
-20
25°C
75°C
-30
125°C
IKA = 10mA
-40
-50
0
50
40
30
20
10
3
6
9
12 15
18
21
24
0
10
27 30
100
1K
10K
100K
f Frequency (Hz)
VKA Cathode Voltage (V)
Figure 10. Noise Voltage VS Frequency
Figure 9. Reference Voltage Line Regulation VS
Cathode Voltage and TAMBIENT
Date: 05/25/04
VKA = VREF
IK = 10mA
TA = 25°C
SPX2431 Precision Adjustable Shunt Regulator
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© Copyright 2004 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
ZKA Dynamic Impedance (Ω)
0.125
/DIV
10.000dB
45.000deg
REF LEVEL
60.000dB
0.0deg
0.150
VKA = VREF
IK = 1 to 100mA
f≤1kHz
MARKER 25 297 698.000 Hz
MAG (A/R)
-0.025 dB
MARKER 25 297 698.000 Hz
PHASE (A/R)
93.320 deg
60dB
215°
180°
50dB
PHASE
0.100
0.075
40dB
135°
30dB
90°
20dB
45°
0°
10dB
GAIN
0.050
0.025
-45°
-10dB
-90°
-20dB
-135°
-30dB
0.0
-60
0dB
-30
0
30
60
90
120
-180°
-40dB
10
TA Free Air Temperature
100
1K
10K
100K
START 10.000Hz
1M
-215°
10M
STOP 50 000 000.000Hz
Figure 12. Small Signal Gain and Phase VS Frequency;
IK = 10mA, TA = 25°C
Figure 11. Low Frequency Dynamic Output Impedance
VS TAMBIENT
VOUT
VIN
230Ω
9µF
15kΩ
IK
VOUT
VIN
8.25kΩ
GND
Figure 13. Test Circuit for Gain and Phase Frequency
Response
Figure 14. Frequency = 100kHz, IK = 10mA, TA = 25°C
100
VIN
90
250Ω
80
IK Cathode Current (mA)
VOUT
IK
fp = 100kHz
50Ω
A: VKA = VREF
B: VKA= 5V at IK=10mA
C: VKA=10V at IK=10mA
D: VKA=15V at IK=10mA
70
C
60
50
40
STABLE
STABLE
A
30
20
TA = 25°C
10
B
D
0
100
GND
102
103
104
105
106
107
CL Load Capacitance (pF)
Figure 15. Test Circuit for Pulse Response
Date: 05/25/04
101
Figure 16. Stability Boundary Conditions
SPX2431 Precision Adjustable Shunt Regulator
5
© Copyright 2003 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
100
ZKA Dynamic Impedance (Ω)
150 Ω
IK
R
CL
10kΩ
TA = 25°C
IK = 1 to 100mA
10
1.0
0.1
0.01
1K
100K
1M
f Frecuency (Hz)
10M
Figure 18. Dynamic Output Impedance TA = 25°C,
IK = 1 to 100mA
Figure 17. Test Circuit for Stability
100
IKOFF Cathode Current (nA)
10K
R3
VIN
VOUT
10
R1
0.1%
VKA = 20V
VREF = 0V
1
VREF
SPX2431
0.1
R2
0.1%
0.01
-50
0
50
100
150
TA Ambient Temperature (°C)
Figure 19. Off State Leakage
Figure 20. Shunt Regulator VOUT = (1+R1/R2)VREF
VIN
VOUT
ISINK
R3
R2
R1
0.1%
Opto Isolator
Q1
R3 sets feedback gain,
C1 provides feedback
compensation
Isolated
Feedback
SPX2431
C1
C2
R1
0.1%
+
SPX2431
R2
0.1%
VOUTRTN
Figure 22. Reference Amplifier for Isolated Feedback in
Off-Line DC-DC Converters
Figure 21. Constant Current, Sink, ISINK = VREF/R1
Date: 05/25/04
SPX2431 Precision Adjustable Shunt Regulator
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© Copyright 2004 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
VIN
VIN
VOUT
R5
R1
0.1%
R4
C1
R1
0.1%
R3
R2
0.1%
R3
VOUT
SPX2431
Q1
SPX2431
R2
0.1%
Figure 23. Precision High Current Series Regulator
VOUT = (1+R1/R2)VREF
Figure 24. High Current Shunt Regulator
VOUT = (1+R1/R2)VREF
VCC
R2
VIN
R1
* Resistor values are chosen such that the effect to
IREF is negligible.
VOUT
SPX2431
Figure 25. Single Supply Comparator with Temperature
Compensated Threshold. VIN Threshold = 2.5V
Date: 05/25/04
SPX2431 Precision Adjustable Shunt Regulator
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© Copyright 2003 Sipex Corporation
PACKAGES: 3 PIN SOT-23
D
b
B
3
B
E1
1
SEE VIEW C
E
VIEW A-A
2
e
Gauge Plane
e1
Seating Plane
L
Ø
L1
VIEW C
3 PIN SOT-23
JEDEC TO-236
(AB) Variation
Dimensions in (mm)
A
MIN
A
0.89
A1
0.01
A2
NOM MAX
-
1.12
-
0.88
0.95
1.02
0.30
-
0.50
c
0.08
-
0.20
2.80
2.90
e
0.95 BSC
e1
1.90 BSC
E
2.10
E1
1.20
L
0.40
C
A1
SIDE VIEW
b
WITH PLATING
-
2.64
1.40
c
0.60
0.54 REF
L1
Ø
A
3.04
1.30
0.50
Seating Plane
0.10
b
D
A2
A
0º
-
BASE METAL SECTION B-B
8º
3 PIN SOT-23
Date: 05/25/04
SPX2431 Precision Adjustable Shunt Regulator
8
© Copyright 2004 Sipex Corporation
ORDERING INFORMATION
PART NUMBER
ACC
SPX2431AM ...................... 0.5%
SPX2431AM/TR ................ 0.5%
SPX2431M ........................ 1.0%
SPX2431M/TR .................. 1.0%
OUTPUT VOLTAGE
PACKAGES
...................... 2.5V ......................... 3 Pin SOT-23
...................... 2.5V ......................... 3 Pin SOT-23
...................... 2.5V ......................... 3 Pin SOT-23
...................... 2.5V ......................... 3 Pin SOT-23
/TR = Tape and Reel
Pack quantity is 2,500 for SOT-23.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: [email protected]
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Date: 05/25/04
SPX2431 Precision Adjustable Shunt Regulator
9
© Copyright 2003 Sipex Corporation