Low Extended Temperature Range.................. 0°C to 105°C
°
°
•
Low Temperature Coefficient............................... 30 ppm/°C
°
•
Offered in TO-92, SOT-89 and SO-8
•
Improved replacement in performance of AS431 & TL431
•
Low Cost Solution
•
Battery Operating Equipment
•
Adjustable Supplies
•
Switching Power Supplies
•
Error Amplifiers
•
Single Supply Amplifier
•
Monitors/ VCR/ TV
•
Personal Computers
PRODUCT DESCRIPTION
The ALPHA Semiconductor AS431L is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate bandgap
reference. AS431L acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The AS431L thermal
stability, wide operating current (100mA) and temperature range (0°C to 105°C) makes it suitable for all variety of applications that
are looking for a low cost solution with high performance.
The output voltage may be adjusted to any value between V
REF
and 20V with 2 external resistors. The AS431L is operating in full
industrial temperature range of 0°C to 105°C. The AS431L is available in TO-92, SOT-89 and SO-8 packages.
ORDERING INFORMATION
Part Number
AS431LXN
AS431LXM1
AS431LXS
Temperature Range
0°C to 105°C
0°C to 105°C
0°C to 105°C
Package Type
TO-92
SOT-89
SO-8
PIN CONFIGURATION
8-Pin Surface Mount (S)
CATHODE
ANODE
ANODE
NC
1
2
8
7
REF
ANODE
ANODE
NC
X= Tolerance (A = 0.5%; Blank = 1%; C = 2%)
ALPHA
AS431L
6
3
4
5
CATHODE (K)
Top View
REFERENCE
(R)
SOT-89 (M1)
+
TO-92 (N)
-
ALPHA
AS431L
1
2
3
REF
REF
ANODE CATHODE
1
2
3
2.5V
CATHODE
ANODE
ANODE (A)
Top View
Bottom View
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390
Rev. 11/29/99
AS431L
ABSOLUTE MAXIMUM RATINGS
Parameter
Cathode-Anode Reverse Breakdown
Anode-Cathode Forward Current
Operating Cathode Current
Reference Input Current
Continuous Power Dissipation at 25°C
TO-92
SOT-89
Junction Temperature
Storage Temperature
Lead Temperature (Soldering 10 sec.)
Symbol
V
KA
I
AK
I
KA
I
REF
P
D
Rating
30
1
150
10
775
1000
150
-65 to +150
300
Units
V
A
mA
mA
mW
°C
°C
°C
T
J
T
STG
T
L
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
Parameter
Cathode Voltage
Cathode Current
Symbol
V
KA
I
K
Rating
V
REF
to 20
10
Unit
V
mA
TYPICAL THERMAL RESISTANCE
Package Type
TO-92
SOT-23
SOT-89
θ
JA
160°C/W
575°C/W
110°C/W
θ
JC
80°C/W
150°C/W
8°C/W
Typical Derating
6.3 mW/°C
1.7 mW/°C
9.1 mW/°C
ELECTRICAL CHARACTERISTICS
at 25°C I
k
@ 10mA V
k
=V
ref
, unless otherwise specified.
Parameter
Reference
Voltage
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
TC = Test Circuit
Symbol
V
REF
∆
V
REF
∆V
K
I
REF
∆I
REF
I
K(MIN)
I
K(OFF)
Test Conditions
T
A
= 25°C TC =
1
V
REF
to 10V
10V to 20V TC =
2
TC = 2
Over Temp. TC =
2
TC = 1
V
REF
= 0V,
V
KA
= 20V TC =
3
TC = 1
AS431LA
Min
Typ
2.490
2.503
-2.7
-2
-1.0
-0.4
0.7
0.4
0.4
0.04
Max
2.515
Min
2.470
-2.7
-2
AS431L
Typ
Max
2.495 2.520
-1.0
-0.4
0.7
0.4
0.4
0.04
Min
2.445
-2.7
-2
AS431LC
Typ
Max
2.495 2.545
-1.0
-0.4
0.7
0.4
0.4
0.04
Unit
V
mV/V
0.3
4
1.2
1
1
0.3
4
1.2
1
1
0.3
4
1.2
1
1
µA
µA
mA
µA
Ω
Z
KA
0.15
0.5
0.15
0.5
0.15
0.5
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390
Rev. 11/29/99
AS431L
*CALCULATING AVERAGE TEMPERATURE COEFFICEINT (TC)
ppm
0
0
0
∆V
REF
∆T
mV
%
TC in mV/°C =
∆V
REF
(mV)
∆T
A
-10
5000
0.5
TC in mV/°C =
(
∆V
REF
∆T
A
∆V
REF
at 25°C
)
x 100
0
15
30
45
60
75
90
105
TC in ppm/°C =
(
∆V
REF
∆V
REF
at 25°C
∆T
A
)
x 10
6
0.07 mV/°C
0.003 %/°C
27 ppm/°C
TEST CIRCUITS
V
IN
V
KA
= V
REF
V
IN
V
KA
V
IN
V
KA
I
REF
I
K
R
1
I
K
I
REF
I
K (OFF)
(V
REF
)
R
2
1G-40
1G-38
1G-39
TEST CIRCUIT 1
TEST CIRCUIT 2
TEST CIRCUIT 3
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390
Rev. 11/29/99
AS431L
TYPICAL PERFORMANCE CURVES
Low Current Operating Characteristics
900
800
700
600
V
KA
= V
REF
Temperature Range: - 0°C to 105 °C
150
125
100
V
KA
= V
REF
Temperature Range: - 0°C to 105 °C
High Current Operating Characteristics
I
K
- Cathode Current (mA)
75
50
25
0
-25
-50
-75
-100
-2
-1
0
1
2
3
µ
I
K
- Cathode Current (µA)
500
400
105 °C
300
25 °C
200
-0 °C
100
0
-100
-200
-1.0
0
1.0
2.0
3.0
V
KA
- Cathode Voltage (V)
V
KA
- Cathode Voltage (V)
Figure 3
Figure 2
Off State Leakage
100
V
KA
= 36V
V
REF
= 0V
2.53
V
KA
= V
REF
I
K
= 10 mA
Reference Voltage vs. Ambient Temperature
2.52
I
Z
off - Off State Cathode Current (nA)
10
2.51
V
REF
- Reference Voltage (V)
2.50
V
REF
= 2.500 V at 25 °C
2.49
1
2.48
0.1
2.47
2.46
0.01
-60
-30
0
30
60
90
120
2.45
-60
-30
0
30
60
90
120
T
A
- Ambient Temperature ( °C)
T
A
- Ambient Temperature ( °C)
Figure 4
Figure 5
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390
Rev. 11/29/99
AS431L
TYPICAL PERFORMANCE CURVES
Reference Input Current
3.0
R1 = 10 k
Ω
R2 =
∞
I
K
= 10 mA
2.5
-10
0
Reference Voltage Line Regulation
µ
I
REF
- Reference Input Current (µ A)
V
KA
- Cathode Voltage (V)
0 °C
-20
25 °C
75 °C
-30
105 °C
2.0
1.5
1.0
-40
0.5
-50
0
3
6
9
12
15
18
21
24
27
30
V
KA
- Cathode Voltage (V)
0
-60
-30
0
30
60
90
120
Figure 7
T
A
- Ambient Temperature ( °C)
Figure 6
Noise Voltage
70
0.150
Low Frequency Dynamic Output Impedance
V
KA
= V
REF
I
KA
= 1 to 100 mA
f < 1 kHz
60
0.125
50
Ω
Z
KA
- Dynamic Impedance (Ω )
0.100
√
Noise Voltage nV/√ Hz
40
0.075
30
0.050
20
0.025
10
0.0
-60
-30
0
30
60
90
120
T
A
- Free Air Temperature
0
10
100
1k
10 k
100 k
Figure 9
f - Frequency (Hz)
Figure 8
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390
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