®
SPX431A,B,C
Precision Adjustable Shunt Regulator
FEATURES
■
Trimmed Bandgap to 0.5%, 1% and 2%
■
Wide Operating Current 1mA to 150mA
■
Extended Temperature Range:
0°C to 105°C
■
Low Temperature Coefficient 30 ppm/°C
■
Offered in TO-92, SOIC, SOT-89,
SOT-23-5
■
Improved Replacement in Performance for
TL431
■
Low Cost Solution
APPLICATIONS
■
Battery Operating Equipment
■
Adjustable Supplies
■
Switching Power Supplies
■
Error Amplifiers
■
Single Supply Amplifier
■
Monitors / VCRs / TVs
■
Personal Computers
Now Available in Lead Free Packaging
Refer to page 3 for pinouts.
DESCRIPTION
The SPX431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate
bandgap reference. The SPX431 acts as an open-loop error amplifier with a 2.5V temperature
compensation reference. The SPX431's thermal stability, wide operating current (150mA) and
temperature range (0°C to 105°C) makes it suitable for a variety of applications that require a low
cost, high performance solution. SPX431A 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 V
REF
and 36 volts with two external
resistors. The SPX431 is available in TO-92, SOIC-8, SOT-89, and SOT-23-5 packages.
TYPICAL APPLICATIONS CIRCUIT
Cathode (K)
Reference
(R)
+
-
2.5V
Anode (A)
Date: 1/19/05
SPX431A,B,C Precision Adjustable Shunt Regulator
© Copyright 2005 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Cathode-Anode Reverse Breakdown V
KA
....................................... 37V
Anode-Cathode Forward Current, (<10ms) I
AK
................................. 1A
Operating Cathode Current I
KA
.................................................. 150mA
Reference Input Current I
REF
........................................................ 10mA
Continuous Power Dissipation at 25°C P
D
TO-92 ..................................................................... 775mW
SOT-23 .................................................................. 200 mW
SOIC-8 .................................................................... 750mW
SOT-89 ................................................................. 1000mW
Junction Temperature T
J
........................................................... 150
°C
Storage Temperature T
STG
.............................................. -65 to 150
°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
V
KA
I
K
RATING
V
REF
to 36
10
UNIT
V
mA
TYPICAL THERMAL RESISTANCES
PACKAGE
TO-92
SOT-23
SOIC-8
SOT-89
0
JA
0
JC
TYPICAL DERATING
6.3 mW/°C
1.7 mW/°C
5.7 mW/°C
9.1 mW/°C
160°C/W 80°C/W
575°C/W 150°C/W
175°C/W 45°C/W
110°C/W
8°C/W
Typical deratings of the thermal resistances are given for ambient
temperature >25°.
ELECTRICAL CHARACTERISTICS
Electrical characteristics at 25°C I
K
= 10mA V
K
= V
REF
, unless otherwise specified.
PARAMETER
SPX431A
Reference Voltage
∆V
REF
withTemp.*
Ratio of Change in V
REF
to Cathode Voltage
Reference Input Current
I
REF
Temp Deviation
Min I
K
for Regulation
Off State Leakage
Dynamic Output
Impedance
SPX431B
Reference Voltage
∆V
REF
withTemp.*
Ratio of Change in V
REF
to Cathode Voltage
Reference Input Current
I
REF
Temp Deviation
Min I
K
for Regulation
Off State Leakage
Dynamic Output
Impedance
V
REF
TC
∆
V
REF
∆V
K
I
REF
∆I
REF
I
K(MIN)
I
K(OFF)
Z
KA
2
2
2
3
3
3
2
4
2
V
REF
= 0V, V
KA
= 36V
ƒ
z
= 1kHz
I
K
= 1 to 150mA
T
J
= 0°C to 105°C
V
REF
to 10V
10V to 36V
-2.7
-2.0
T
J
= 0°C to 105°C
2.470
2.449
2.495
0.07
-1.0
-0.4
0.7
0.4
0.4
0.04
0.15
2.520
2.541
0.20
0.3
4.0
1.2
1.0
500
0.5
µA
µA
mA
nA
Ω
V
V
mV/°C
mV/V
V
REF
TC
∆
V
REF
∆V
K
I
REF
∆I
REF
I
K(MIN)
I
K(OFF)
Z
KA
2
2
2
3
3
3
2
4
2
V
REF
= 0V, V
KA
= 36V
ƒ
z
= 1kHz
I
K
= 1 to 150mA
T
J
= 0°C to 105°C
V
REF
to 10V
10V to 36V
-2.7
-2.0
T
J
= 0°C to 105°C
2.490
2.469
2.503
0.07
-1.0
-0.4
0.7
0.4
0.4
0.04
0.15
2.515
2.536
0.20
0.3
4.0
1.2
1.0
250
0.5
µA
µA
mA
nA
Ω
V
V
mV/°C
mV/V
SYMBOL
FIGURE
CONDITIONS
MIN
TYP
MAX
UNITS
Date: 1/19/05
SPX431A,B,C Precision Adjustable Shunt Regulator
© Copyright 2005 Sipex Corporation
2
PARAMETER
SPX431C
Reference Voltage
∆V
REF
withTemp.*
Ratio of Change in V
REF
to Cathode Voltage
Reference Input Current
I
REF
Temp Deviation
Min I
K
for Regulation
Off State Leakage
Dynamic Output
Impedance
SYMBOL
V
REF
TC
∆
V
REF
∆V
K
I
REF
∆I
REF
I
K(MIN)
I
K(OFF)
Z
KA
FIGURE
2
2
2
3
3
3
2
4
2
CONDITIONS
MIN
2.445
TYP
2.495
0.07
MAX
2.545
0.20
0.3
4.0
1.2
1.0
1000
0.5
UNITS
V
V
mV/°C
mV/V
µA
µA
mA
nA
Ω
T
J
= 0°C to 105°C
V
REF
to 10V
10V to 36V
T
J
= 0°C to 105°C
V
REF
= 0V, V
KA
= 36V
ƒ
z
= 1kHz
I
K
= 1 to 150mA
-2.7
-2.0
-1.0
-0.4
0.7
0.4
0.4
0.04
0.15
Operating Range (T
J
) = -40
°
C to 125
°
C.
* See appropiate test circuit (Figure 2)
CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
ppm
0
%
0
mV
0
∆
V
REF
•
TC in mV/°C =
∆
T
∆
V
REF
(mV)
∆
T
A
-10
5000
0.5
•
TC in %/°C =
(
(
∆
V
REF
∆
V
REF
at 25°C
∆
T
A
∆
V
REF
∆
V
REF
at 25°C
∆
T
A
)
)
x 100
x 10
6
0
15
30
45
60
75
90
105
•
TC in ppm/°C =
Junction Temperature (°C)
0.07 mV/°C
0.003 %/°C
27 ppm/°C
Figure 1. V
REF
VS Temperature.
PACKAGE PINOUTS
8-Pin Surface Mount (S)
SOT-23-5 (M5)
REF
CATHODE
ANODE
ANODE
N/C
1
2
3
4
8
7
REF
ANODE
ANODE
N/C
N/C
N/C
CATHODE
5
ANODE
4
1
2
3
SOT-89 (M1)
TO-92 (N)
SPX431
1
2
3
1
REF
SPX431
2
3
CATHODE
ANODE
REF
ANODE
CATHODE
SPX431
6
5
Top View
Top View
Top View
Bottom View
Date: 1/19/05
SPX431A,B,C Precision Adjustable Shunt Regulator
© Copyright 2005 Sipex Corporation
3
TEST CIRCUITS
V
IN
V
KA =
V
REF
V
IN
V
KA
V
IN
V
KA
I
K (OFF)
I
REF
I
K
R1
I
REF
(V
REF
)
R2
I
K
Figure 2. Test Circuit for V
KA
= V
REF
Figure 3. Test Circuit for V
KA
> V
REF
Figure 4. Test Circuit for I
KOFF
TYPICAL PERFORMANCE CHARACTERISTICS
150
125
100
V
KA
= V
REF
0°C to 105°C
2.53
2.52
V
REF
Reference Voltage (V)
V
KA
= V
REF
I
K
= 10mA
I
K
Cathode Current (mA)
2.51
2.50
2.49
2.48
2.47
2.46
75
50
25
0
-25
-50
-75
-100
-2
-1
0
1
2
V
KA
Cathode Voltage (V)
3
2.45
-60
-30
0
30
60
90
T
A
Ambient Temperature (°C)
120
Figure 5. High Current Operating Characteristics
Figure 6. Reference Voltage VS Ambient Tempetature
3.0
I
REF
Reference Input Current (µA)
900
800
700
I
K
Cathode Current (µA)
V
KA
= V
REF
0° to 105°C
2.5
2.0
1.5
1.0
0.5
0
-60
R1 = 10kΩ
R2 =
∞
I
K
= 10mA
600
500
400
300
200
100
0
-100
-200
-1.0
1.0
2.0
V
KA
Cathode Voltage (V)
0
3.0
105°C
25°C
-0°C
-30
0
30
60
90
120
T
A
Ambient Temperature (°C)
Figure 7. Low Current Operating Characteristics
Date: 1/19/05
Figure 8. Reference Input Current VS Ambient
Temperature
© Copyright 2005 Sipex Corporation
SPX431A,B,C Precision Adjustable Shunt Regulator
4
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
0
70
60
0°C
Noise Voltage nV/√Hz
-10
50
40
30
20
10
0
10
V
KA
= V
REF
I
K
= 10mA
T
A
= 25°C
100
1K
10K
100K
∆V
REF
(mV)
-20
25°C
75°C
-30
I
KA
= 10mA
-40
125°C
-50
0
3
6
9
12 15
18
21
24
27 30
V
KA
Cathode Voltage (V)
f Frequency (Hz)
Figure 9. Reference Voltage Line Regulation VS
Cathode Voltage and T
AMBIENT
Figure 10. Noise Voltage VS Frequency
0.150
Z
KA
Dynamic Impedance (Ω)
REF LEVEL
60.000dB
0.0deg
/DIV
10.000dB
45.000deg
MARKER 19 422
MAG (A/R)
MARKER 19 422
PHASE (A/R)
611.000Hz
-0.125dB
611.000Hz
46.717deg
215°
180°
PHASE
0.125
0.100
0.075
0.050
0.025
V
KA
= V
REF
I
K
= 1 to 100mA
f≤1kHz
60dB
50dB
40dB
30dB
20dB
10dB
0dB
-10dB
-20dB
GAIN
135°
90°
45°
0°
-45°
-90°
-135°
-180°
-215°
0.0
-60
-30
0
30
60
90
120
T
A
Free Air Temperature
-30dB
-40dB
10
100
1K
10K
100K
1M
10M
START 10.000Hz
STOP 50 000 000.000Hz
Figure 11. Low Frequency Dynamic Output Impedance
VS T
AMBIENT
Figure 12. Small Signal Gain and Phase VS Frequency;
I
K
= 10mA, T
A
= 25°C
V
OUT
15kΩ
230Ω
V
IN
9µF
I
K
V
OUT
V
IN
8.25kΩ
GND
Figure 13. Test Circuit for Gain and Phase Frequency
Response
Date: 1/19/05
Figure 14. F
Z
= 100kHz, I
K
= 10mA, T
A
= 25°C
SPX431A,B,C Precision Adjustable Shunt Regulator
© Copyright 2005 Sipex Corporation
5
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