概述
数据手册AS2431EAST 概述
Precision Adjustable Shunt Reference 精密可调并联型电压基准
AS2431EAST 数据手册
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SEMICONDUCTOR
Precision Adjustable Shunt Reference
Features
Description
•
•
•
•
•
Temperature-compensated: 15 ppm/°C
The AS2431 is a three-terminal adjustable shunt regulator providing a
highly accurate bandgap reference. The adjustable shunt regulator is
ideal for a wide variety of linear applications that can be implemented
using external components to obtain adjustable currents and voltages.
Trimmed bandgap reference
Internal amplifier with 100 mA capability
Multiple temperature ranges
In the standard shunt configuration, the combination of low temperature
coefficient (TC), sharp turn-on characteristics, low output impedance
and programmable output voltage make this precision reference an
excellent error amplifier.
Low frequency dynamic output
impedance: < 450 mΩ
•
Low output noise
The AS2431 is a direct replacement for the AS431 in low voltage, low
current applications. It is also available in the very small footprint SOT-
23.
Pin Configuration – Top View
TO-92 (LP)
8L SOIC (8D)
CATHODE
ANODE
ANODE
N/C
REFERENCE
ANODE
ANODE
N/C
1
2
3
4
8
7
6
5
CATHODE
ANODE
REFERENCE
SOT-89 (S)
3L SOT-23 (3VS)
CATHODE
ANODE
CATHODE
ANODE
REFERENCE
REFERENCE
Ordering Information
AS2431 A C 8D N
Packaging Option:
Circuit Type:
= Ammo Pack
= Bulk
A
B
Precision Adjustable
Shunt Regulator
= Tube
T
= Tape and Reel (7" Reel Dia. SOT-23 Only)
= Tape and Reel (13" Reel Dia)
M
N
Bandgap Tolerance:
A = ±0.25%
C = ±0.5%
Package Style:
D = ±1.0%
E = ±2.0%
8D = 8 Pin, Plastic SOIC
LP = TO-92
Temperature Range:
S = SOT-89
=
=
=
=
A
B
C
F
3VS = 3 Pin, SOT-23
0°C to 70°C
0°C to 105°C
–40°C to +85°C
–55°C to +125°C
www.ptcc.com.tw
17
AS2431
Precision Adjustable Shunt Reference
Functional Block Diagram
CATHODE (K)
REFERENCE
(R)
+
–
2.5 V
ANODE (A)
Absolute Maximum Ratings
Parameter
Symbol
Rating
Units
Cathode-Anode Reverse Breakdown
Anode-Cathode Forward Current
Operating Cathode Current
Reference Input Current
Continuous Power Dissipation at 25°C
TO-92
VKA
IAK
18
1
V
A
IKA
100
1
mA
mA
IREF
PD
775
750
mW
mW
mW
mW
°C
8L SOIC
SOT-89
1000
200
3L SOT-23
Junction Temperature
Storage Temperature
Lead Temp, Soldering 10 Seconds
TJ
TSTG
TL
150
–65 to 150
300
°C
°C
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 sec-
tions 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
Package
θJA
θJC
Typical Derating
Cathode Voltage
Cathode Current
VKA
IK
VREF to 18
10
V
TO-92
SOIC
160°C/W
175°C/W
110°C/W
80°C/W
45°C/W
8°C/W
6.3 mW/°C
5.7 mW/°C
9.1 mW/°C
1.7 mW/°C
mA
SOT-89
SOT-23/5L 575°C/W
150°C/W
www.ptcc.com.tw
18
AS2431
Precision Adjustable Shunt Reference
Average Temperature Coefficient
∆VREF (mV)
0
0
0
• TC in mV/°C =
∆TA
∆V
REF
∆V
∆T
REF
X 100
V
REF at 25°C
–10
–20
• TC in %/°C =
5000
0.5
∆TA
∆V
REF
X 106
V
REF at 25°C
0
15 30
45 60 75 90 105
• TC in ppm/°C =
∆TA
Temperature (°C)
0.07 mV/°C
0.003%/°C
27 ppm/°C
Test Circuits
V
V
V
V
KA = V
V
V
KA
IN
IN
IN
REF
KA
IK
IREF
IK
IK (OFF)
R1
)
IREF
(V
REF
R2
Figure 1a. Test Circuit 1
Figure 1b. Test Circuit 2
Figure 1c. Test Circuit 3
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20
Precision Adjustable Shunt Reference
AS2431
Typical Performance Curves
Low Current Operating Characteristics
High Current Operating Characteristics
150
125
100
900
V
KA = V
V
KA = V
REF
REF
800
700
Temperature Range: –55 to 125°C
Temperature Range: –55 to 125°C
600
500
75
50
25
0
400
125°C
300
200
100
0
25°C
–55°C
–25
–50
–75
–100
–200
–100
–2
–1
0
1
2
3
–1.0
0
1.0
2.0
3.0
VKA – Cathode Voltage (V)
VKA – Cathode Voltage (V)
Figure 2
Figure 3
Off State Leakage
Reference Voltage vs Ambient Temperature
100
3.53
V
KA = V
REF
V
KA = 18 V
2.52
2.51
IK = 10 mA
VREF = 0 V
10
1
2.50
2.49
VREF = 2.500 V at 25°C
2.48
2.47
0.1
2.46
2.45
0.01
–60
–30
0
30
60
90
120
–60
–30
0
30
60
90
120
TA – Ambient Temperature (°C)
T
– Ambient Temperature (°C)
A
Figure 4
Figure 5
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21
AS2431
Precision Adjustable Shunt Reference
Typical Performance Curves
Reference Input Current
Reference Voltage Line Regulation
0
3.0
R1 = 10 kΩ
R2 = ∞
–30°C
2.5
2.0
1.5
IK =10 mA
–5
–10
25°C
–15
1.0
0.5
0
75°C
–20
125°C
IK = 10 mA
Temperature Range: –55 to 125°C
–25
0
3
6
9
12
15
18
–60
–30
0
30
60
90
120
VKA – Cathode Voltage (V)
TA – Ambient Temperature (°C)
Figure 6
Figure 7
Noise Voltage
Low Frequency Dynamic Output Impedance
70
60
0.150
V
KA = V
V
KA = V
REF
REF
IKA = 1 to 100 mA
f ≤ 1 kHz
IK = 10 mA
TA = 25°C
0.125
0.100
50
40
30
0.075
0.050
20
10
0
0.025
0.0
10
100
1 k
10 k
100 k
–60
–30
0
30
60
90
120
f – Frequency (Hz)
TA – Free Air Temperature
Figure 8
Figure 9
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22
Precision Adjustable Shunt Reference
AS2431
Typical Performance Curves
Dynamic Output Impedance
100
10
TA = 25°C
IK = 1 to 100 mA
1.0
0.1
0.01
1 k
10 k
100 k
1 M
10 M
f – Frequency (Hz)
Figure 10
Small Signal Voltage Gain vs. Frequency
Temperature Range: –55 to 125°C
IK = 10 mA
70
60
OUT
IK
230 Ω
15 k
50
40
30
20
10
0
9 µF
8.25 k
GND
1 k
10 k
100 k
1 M
10 M
f – Frequency (Hz)
Figure 11
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23
AS2431
Precision Adjustable Shunt Reference
Typical Performance Curves
Pulse Response
6
Input
INPUT
MONITOR
220 Ω
5
OUT
4
3
Output
50 Ω
fP = 100 kHz
2
1
0
GND
–1
0
1
2
3
4
5
6
7
8
9 10 11 12
t – Time (ms)
Figure 12
Stability Boundary Conditions
100
A: VKA = V
REF
90
80
70
60
B: VKA = 5 V at IK = 10 mA
C: VKA = 10 V at IK = 10 mA
D: VKA = 15 V at IK = 10 mA
150 Ω
IK
C
50
40
CL
A
Stability
Region
30
20
10 K
B
TA = 25°C
10
0
100
D
101
102 103
104
105
106
107
CL – Load Capacitance (pF)
Figure 13
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24
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