ETC1 AS2431ABLPB Precision adjustable shunt reference Datasheet

AS2431
Precision Adjustable Shunt Reference
SEMICONDUCTOR
Features
Description
•
•
•
•
•
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.
•
Temperature-compensated: 15 ppm/°C
Trimmed bandgap reference
Internal amplifier with 100 mA capability
Multiple temperature ranges
Low frequency dynamic output
impedance: < 450 mΩ
Low output noise
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.
The AS2431 is a direct replacement for the AS431 in low voltage, low
current applications. It is also available in the very small footprint SOT23.
Pin Configuration –
Top View
TO-92 (LP)
8L SOIC (8D)
CATHODE
1
8
REFERENCE
ANODE
2
7
ANODE
ANODE
3
6
ANODE
N/C
4
5
N/C
CATHODE
ANODE
REFERENCE
SOT-89 (S)
3L SOT-23 (3VS)
CATHODE
CATHODE
ANODE
ANODE
REFERENCE
REFERENCE
Ordering Information
AS2431 A C 8D N
Packaging Option:
A = Ammo Pack
B = Bulk
T = Tube
M = Tape and Reel (7" Reel Dia. SOT-23 Only)
N = Tape and Reel (13" Reel Dia)
Circuit Type:
Precision Adjustable
Shunt Regulator
Bandgap Tolerance:
A = ±0.25%
C = ±0.5%
D = ±1.0%
E = ±2.0%
Package Style:
8D = 8 Pin, Plastic SOIC
LP = TO-92
S = SOT-89
3VS = 3 Pin, SOT-23
Temperature Range:
A = 0°C to 70°C
B = 0°C to 105°C
C = –40°C to +85°C
F = –55°C to +125°C
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AS2431
Precision Adjustable Shunt Reference
Functional Block Diagram
CATHODE (K)
REFERENCE
(R)
+
–
2.5 V
ANODE (A)
Absolute Maximum Ratings
Parameter
Symbol
Rating
Units
VKA
18
V
Cathode-Anode Reverse Breakdown
Anode-Cathode Forward Current
IAK
1
A
Operating Cathode Current
IKA
100
mA
Reference Input Current
IREF
1
mA
Continuous Power Dissipation at 25°C
PD
TO-92
775
mW
8L SOIC
750
mW
SOT-89
1000
mW
3L SOT-23
200
mW
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
–65 to 150
°C
TL
300
°C
Lead Temp, Soldering 10 Seconds
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
Typical Thermal Resistances
Symbol
Rating
Cathode Voltage
VKA
VREF to 18
V
Cathode Current
IK
10
mA
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Unit
θJA
θJC
Typical Derating
TO-92
160°C/W
80°C/W
6.3 mW/°C
SOIC
175°C/W
45°C/W
5.7 mW/°C
SOT-89
110°C/W
8°C/W
9.1 mW/°C
SOT-23/5L 575°C/W
150°C/W
1.7 mW/°C
Package
18
AS2431
Precision Adjustable Shunt Reference
mV
%
ppm
Average Temperature Coefficient
0
0
0
∆VREF (mV)
• TC in mV/°C =
∆TA
∆VREF
∆VREF
∆T
–10
5000
• TC in %/°C =
0.5
VREF at 25°C
X 100
∆TA
∆VREF
–20
0
15
30
45 60 75
Temperature (°C)
90
105
• TC in ppm/°C =
VREF at 25°C
X 106
∆TA
0.07 mV/°C
0.003%/°C
27 ppm/°C
Test Circuits
VIN
IREF
VKA = VREF
IK
VIN
VKA
IK
R1
VIN
VKA
IK (OFF)
IREF
(VREF)
R2
Figure 1a. Test Circuit 1
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Figure 1b. Test Circuit 2
20
Figure 1c. Test Circuit 3
Precision Adjustable Shunt Reference
AS2431
Typical Performance Curves
Low Current Operating Characteristics
High Current Operating Characteristics
150
900
VKA = VREF
Temperature Range: –55 to 125°C
800
700
100
IK – Cathode Current (mA)
600
IK – Cathode Current (µA)
VKA = VREF
Temperature Range: –55 to 125°C
125
500
400
125°C
300
25°C
200
–55°C
100
75
50
25
0
–25
–50
0
–75
–100
–200
–1.0
0
1.0
2.0
–100
–2
3.0
–1
0
VKA – Cathode Voltage (V)
Figure 2
2
3
Figure 3
Off State Leakage
Reference Voltage vs Ambient Temperature
100
3.53
VKA = 18 V
VREF = 0 V
2.52
10
VREF – Reference Voltage (V)
IZ off – Off State Cathode Current (nA)
1
VKA – Cathode Voltage (V)
1
0.1
VKA = VREF
IK = 10 mA
2.51
2.50
VREF = 2.500 V at 25°C
2.49
2.48
2.47
2.46
0.01
–60
–30
0
30
60
90
2.45
–60
120
TA – Ambient Temperature (°C)
0
30
60
90
TA – Ambient Temperature (°C)
Figure 4
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–30
Figure 5
21
120
AS2431
Precision Adjustable Shunt Reference
Typical Performance Curves
Reference Input Current
Reference Voltage Line Regulation
0
3.0
R1 = 10 kΩ
R2 = ∞
IK =10 mA
–30°C
∆VREF – Change in Reference Voltage (mV)
IREF – Reference Input Current (µA)
2.5
2.0
1.5
1.0
0.5
0
–60
–5
–10
25°C
–15
75°C
–20
–25
–30
0
30
60
90
0
120
3
6
9
12
15
18
VKA – Cathode Voltage (V)
TA – Ambient Temperature (°C)
Figure 6
Figure 7
Low Frequency Dynamic Output Impedance
Noise Voltage
70
0.150
VKA = VREF
IK = 10 mA
TA = 25°C
VKA = VREF
IKA = 1 to 100 mA
f ≤ 1 kHz
0.125
ZKA – Dynamic Impedance (Ω)
60
50
Noise Voltage nV/√Hz
125°C
IK = 10 mA
Temperature Range: –55 to 125°C
40
30
20
0.100
0.075
0.050
0.025
10
0.0
–60
0
10
100
1k
10 k
100 k
f – Frequency (Hz)
0
30
60
TA – Free Air Temperature
Figure 8
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–30
Figure 9
22
90
120
Precision Adjustable Shunt Reference
AS2431
Typical Performance Curves
Dynamic Output Impedance
100
ZKA – Dynamic Impedance (Ω)
TA = 25°C
IK = 1 to 100 mA
10
1.0
0.1
0.01
1k
10 k
100 k
1M
10 M
f – Frequency (Hz)
Figure 10
Small Signal Voltage Gain vs. Frequency
70
Temperature Range: –55 to 125°C
AV – Small Signal Voltage Gain (dB)
60
OUT
IK = 10 mA
50
9 µF
15 k
IK
230 Ω
40
8.25 k
30
GND
20
10
0
1k
10 k
100 k
1M
10 M
f – Frequency (Hz)
Figure 11
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AS2431
Precision Adjustable Shunt Reference
Typical Performance Curves
Pulse Response
6
Input
INPUT
MONITOR
Input and Output Votages (V)
5
220 Ω
OUT
4
3
Output
50 Ω
fP = 100 kHz
2
1
GND
0
–1
0
1
2
3
4
5 6 7 8
t – Time (ms)
9 10 11 12
Figure 12
Stability Boundary Conditions
100
90
IK – Cathode Current (mA)
80
A: VKA = VREF
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
70
IK
C
60
50
CL
40
Stability
Region
30
A
10 K
20
10
B
TA = 25°C
D
0
100
101
102
103
104
105
106
107
CL – Load Capacitance (pF)
Figure 13
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