ETC1 AS432AA5VSA 1.24v precision adjustable shunt reference Datasheet

SEMICONDUCTOR
AS432
1.24V Precision Adjustable Shunt Reference
Features
Description
•
•
•
•
•
Temperature-compensated: 50 ppm/°C
The AS432 is a three terminal adjustable shunt regulator utilizing an
accurate 1.24V bandgap reference. The AS432 is functionally similar to
an AS431 except for its lower reference voltage, making it usable in a
wide variety of low voltage applications.
•
Low output noise
0.25% to 2.0% bandgap offered
Internal amplifier with 150 mA capability
Because of its robust bipolar technology, the AS432 handles a wide
range of current, and holds off more than 18V so its use is not limited to
low power, low voltage systems. Significant care has been taken to provide adequate AC bandwidth to allow the AS432 as an amplifier in control systems and power electronics.
Multiple temperature ranges
Low frequency dynamic output
impedance: < 150 mΩ
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
5L SOT-23 (5VS)
N/C
SOT-89 (S)
ANODE
CATHODE
CATHODE
N/C
CATHODE
3L SOT-23 (3VS)
ANODE
ANODE
REFERENCE
REFERENCE
REFERENCE
Ordering Information
AS432 A C 8D N
Circuit Type:
1.24V Precision Adjustable
Shunt Regulator
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)
Bandgap Tolerance:
A = ±0.25%
C = ±0.5%
D = ±1.0%
E = ±2.0%
Package Style:
8D = 8 Pin, Plastic SOIC
5VS = 5 Pin, SOT-23
3VS = 3 Pin, SOT-23
= SOT-89
S
LP = TO-92
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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AS432
1.24V Precision Adjustable Shunt Reference
Functional Block Diagram
CATHODE (K)
REFERENCE
(R)
+
–
+
–
1.24 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 at 25°C
PD
TO-92
775
mW
8L SOIC
750
mW
SOT-89
1000
mW
SOT-23/3L/5L
200
mW
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
–65 to 150
°C
TL
300
°C
Lead Temperature (Soldering 10 sec.)
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
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AS432
1.24V Precision Adjustable Shunt Reference
Typical Performance Curves
mV
%
ppm
* Calculating Average Temperature Coefficient (TC)
0
0
0
∆VREF (mV)
• TC in mV/°C =
∆T
∆TA
∆VREF
∆VREF
2000
0.2
–5
• TC in %/°C =
VREF at 25°C
∆TA
∆VREF
–10
0
15
30
45 60 75
Temperature (°C)
90
105
• TC in ppm/°C =
X 100
VREF at 25°C
X 106
∆TA
0.021 mV/°C
0.008%/°C
8.0 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
28
Figure 1c. Test Circuit 3
1.24V Precision Adjustable Shunt Reference
AS432
Typical Performance Curves
High Current Operating Characteristics
175
800
150
700
125
600
100
IK – Cathode Current (mA)
IK – Cathode Current (µA)
Low Current Operating Characteristics
900
500
400
300
200
125°C
100
0
VKA = VREF
Temperature Range –55 to 125°C
75
50
25
0
–25
–50
–55°C
–100
–75
25°C
–200
–0.5
–100
0
0.5
1.0
1.5
–2
–1
VKA – Cathode Voltage (V)
0
2
VKA – Cathode Voltage (V)
Figure 2
Figure 3
Off State Leakage
Reference Voltage vs Ambient Temperature
100
1.27
VKA = 15 V
VREF = 0 V
1.26
10
VREF – Reference Voltage (V)
IZ off – Off State Cathode Current (nA)
1
1
0.1
VKA = VREF
IK = 10 mA
1.25
1.24
VREF = 1.240 V at 25°C
1.23
1.22
1.21
1.20
0.01
–60
–30
0
30
60
90
1.19
–60
120
TA – Ambient Temperature (°C)
0
30
60
TA – Ambient Temperature (°C)
Figure 4
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–30
Figure 5
29
90
120
AS432
1.24V Precision Adjustable Shunt Reference
Typical Performance Curves
Reference Input Current
Reference Voltage Line Regulation
0
R1 = 10 kΩ
R2 = ∞
IK = 10 mA
∆VREF – Change in Reference Voltage (mV)
IREF – Reference Input Current (µA)
2.4
2.3
2.2
2.1
–10
–40°C
–20
25°C
–30
75°C
–40
IK = 10 mA
Temperature Range: –55 to 125°C
2.0
–60
–50
–30
0
60
30
90
120
0
3
6
12
15
18
VKA – Cathode Voltage (V)
TA – Ambient Temperature (°C)
Figure 6
Figure 7
Noise Voltage
Low Frequency Dynamic Output Impedance
70
40
VKA = VREF
VKA = 1 to 100 mA
f ≤ 1kHz
VKA = VREF
IK = 10 mA
TA = 25°C
ZKA – Dynamic Impedance (mΩ)
60
50
Noise Voltage nV/√Hz
9
125°C
40
30
20
30
20
10
10
0
10
100
1k
10 k
0
–60
100 k
Figure 8
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–30
0
30
60
TA – Free Air Temperature (°C)
f – Frequency (Hz)
Figure 9
30
90
120
1.24V Precision Adjustable Shunt Reference
AS432
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
80
Temperature Range: –55° to 125°C
AV – Small Signal Voltage Gain (dB)
70
OUT
IK = 10 mA
60
9 µF
15 k
IK
230 Ω
50
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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AS432
1.24V Precision Adjustable Shunt Reference
Typical Performance Curves
Pulse Response
4
Input and Output Votages (V)
INPUT
MONITOR
3
220 Ω
OUT
Input
2
50 Ω
Output
fP = 100 kHz
1
GND
0
–1
0
1
2
3
4
5 6 7 8
t – Time (µs)
9 10 11 12
Figure 12
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