BCD AS431AZ-E1 Adjustable precision shunt regulator Datasheet

Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
General Description
Features
The AS431 series ICs are three-terminal adjustable
shunt regulators with guaranteed thermal stability over
a full operation range. These ICs feature sharp turn-on
characteristics, low temperature coefficient and low
output impedance, which make them ideal substitutes
for Zener diodes in applications such as switching
power supply, charger and other adjustable regulators.
·
The output voltage of these ICs can be set to any value
between VREF (2.5V) and the maximum cathode voltage (36V).
·
·
·
·
The AS431 precision reference is offered in two bandgap tolerance: 0.4% and 0.8%.
These ICs are available in 4 Packages: TO-92, SOT-233, SOT-23-5 and SOT-89 .
SOT-89
·
·
·
·
Programmable Precise Output Voltage from 2.5V
to 36V
Very Accurate Reference Voltage: 0.15% Typical
High Stability under Capacitive Load
Low Temperature Deviation: 4.5mV Typical
Low Equivalent Full-range Temperature Coefficient with 20PPM/oC Typical
Low Dynamic Output Resistance: 0.15Ω Typical
Sink Current Capacity from 1mA to 100 mA
Low Output Noise
Wide Operating Range of -40 to 125oC
Applications
·
·
·
·
·
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
TO-92
SOT-23-5
SOT-23-3
Figure 1. Package Types of AS431
Nov. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Pin Configuration
N Package
(SOT-23-3)
R Package
(SOT-89)
ANODE
3
2
1
REF
CATHODE
REF
2
1
CATHODE
2
ANODE
1
REF
ANODE CATHODE
K Package
(SOT-23-5)
Z Package
(TO-92)
3
3
NC
1
NC
2
CATHODE
3
5
ANODE
4
REF
Figure 2. Pin Configuration of AS431 (Top View)
Functional Block Diagram
CATHODE
+
REF
-
VREF
ANODE
Figure 3. Functional Block Diagram of AS431
Nov. 2005 Rev. 1. 1
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Ordering Information
AS431
E1: Lead-Free
Circuit Type
Blank: Tin Lead
TR: Tape and Reel or Ammo
Bandage Tolerance
A: 0.4%
B: 0.8%
Blank: Tube or Bulk
Package
N: SOT-23-3
R: SOT-89
Package
Temperature
Range
SOT-23-3
-40 to 125oC
SOT-23-5
TO-92
SOT-89
-40 to 125oC
-40 to 125oC
-40 to 125oC
K: SOT-23-5
Z: TO-92
Voltage
Tolerance
0.4%
Part Number
Tin Lead
Lead Free
AS431ANTR-E1
Marking ID
Tin Lead
Lead Free
EB5
Packing
Type
Tape & Reel
0.8%
AS431BNTR-E1
EB6
Tape & Reel
0.4%
AS431AKTR-E1
E6H
Tape & Reel
0.8%
AS431BKTR-E1
E6I
Tape & Reel
0.4%
AS431AZ-E1
AS431AZ-E1
Bulk
0.4%
AS431AZTR-E1
AS431AZ-E1
Ammo
0.8%
AS431BZ-E1
AS431BZ-E1
Bulk
0.8%
AS431BZTR-E1
AS431BZ-E1
0.4%
AS431ARTR-E1
E43G
Tape & Reel
0.8%
AS431BRTR-E1
E43H
Tape & Reel
Ammo
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Nov. 2005 Rev. 1. 1
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Cathode Voltage
VKA
40
V
Cathode Current Range (Continuous)
IKA
-100 to 150
mA
Reference Input Current Range
IREF
10
mA
Z, R Package: 770
PD
Power Dissipation
mW
N, K Package: 370
TJ
Junction Temperature
TSTG
Storage Temperature Range
o
160
C
oC
-65 to 150
N Package: 330
Z Package: 150
θJA
Package Thermal Impedance
R Package: 50
oC/W
K Package: 250
ESD (Human Body Model)
4000
V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum
Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Cathode Voltage
VKA
VREF
36
V
Cathode Current
IKA
1.0
100
mA
-40
125
oC
Operating Ambient Temperature Range
Nov. 2005 Rev. 1. 1
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Electrical Characteristics for AS431
Operating Conditions: TA=25oC, unless otherwise specified.
Parameter
Reference Voltage
0.4%
0.8%
Deviation of Reference
Voltage Over-temperature
Test
Circuit
Symbol
4
VREF
4
∆VREF
AS431
Conditions
Min
Typ
Max
2.490
2.500
2.510
2.480
2.500
2.520
4.5
8
-40 to 85
4.5
10
∆VKA=
10V to VREF
-1.0
-2.7
∆VKA=
36V to 10V
-0.5
-2.0
0.7
4
R2=∞, TA=-40 to 85oC
0.4
1.2
VKA=VREF, IKA=10mA
VKA=VREF
IKA=10mA
0 to 70oC
oC
Unit
V
mV
Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage
5
Reference Current
5
IREF
Deviation of Reference Current
Over Full Temperature Range
5
∆IREF
Minimum Cathode Current for
Regulation
4
IKA
(Min)
VKA=VREF
0.4
1.0
mA
Off-state Cathode Current
6
IKA
(Off)
VKA=36V, VREF=0
0.05
1.0
µA
Dynamic Impedance
4
ZKA
VKA=VREF, IKA=1 to 100mA,
f ≤ 1.0KHz
0.15
0.5
Ω
∆VREF
∆VKA
IKA=10mA
IKA=10mA, R1=10KΩ, R2=∞
IKA=10mA, R1=10KΩ
Nov. 2005 Rev. 1. 1
mV/V
µA
µA
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Electrical Characteristics (Continued)
R1
VKA
VIN
IKA
VREF
Figure 4. Test Circuit 4 for VKA=VREF
R3
VIN
VKA
IKA
R1
IREF
VKA=VREF(1+R1/R2)+ IREF R1
R2
VREF
Figure 5. Test Circuit 5 for VKA>VREF
VKA
VIN
IOFF
Figure 6. Test Circuit 6 for IOFF
Nov. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Typical Performance Characteristics
1.5
2.510
VKA = VREF
Reference Current (µA)
Reference Voltage (V)
R1=10K,R2=Infinite
IKA = 10mA
2.505
2.500
2.495
IKA=10mA
1.0
0.5
2.490
2.485
-60
-40
-20
0
20
40
60
80
100
120
0.0
-60
140
-40
-20
0
o
60
80
100
120
140
Figure 8. Reference Current vs. Ambient Temperature
800
VKA=VREF
VKA=VREF
0
TA=25 C
0
TA=25 C
600
100
Cathode Current (µA)
Cathode Current (mA)
40
Ambient Temperature ( C)
Figure 7. Reference Voltage vs. Ambient Temperature
150
20
0
Ambient Temperature ( C)
50
0
400
200
0
-50
-200
-100
-2
-1
0
1
2
-1.0
3
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
Cathode Voltage (V)
Cathode Voltage (V)
Figure 9. Cathode Current vs. Cathode Voltage
Figure 10. Cathode Current vs. Cathode Voltage
Nov. 2005 Rev. 1. 1
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Typical Performance Characteristics (Continued)
1.8
VKA=36V
1.6
VREF=0
-0.9
∆VREF / ∆VKA (mV/V)
Off-state Cathode Current (µA)
2.0
1.4
1.2
1.0
0.8
0.6
0.4
VKA=3.5V to 36V
-1.0
-1.1
-1.2
-1.3
0.2
-1.4
0.0
-40
-20
0
20
40
60
80
100
-40
120
-20
0
20
40
60
80
100
120
o
o
Ambient Temperature ( C)
Ambient Temperature ( C)
Figure 11. Off-state Cathode Current vs.
Ambient Temperature
Figure 12. Ratio of Delta Reference Voltage to the
Ratio of Delta Cathode Voltage
Output
1K
60
10K
100K
1000K
60
15K
242
o
TA = 25 C
50
50
Av (dB)
IKA = 10mA
40
40
30
30
20
20
10
10
0
1K
10µF
8.2K
GND
0
10K
100K
I KA
1000K
Small Signal Frequency
Figure 13. Small Signal Voltage Gain vs. Frequency
Nov. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Typical Performance Characteristics (Continued)
IKA=10mA
Output
Reference Impedance (Ω)
o
10
TA=25 C
1K
IKA
50
1
0.1
1K
10K
100K
1,000K
GND
Frequency (Hz)
Figure 14. Reference Impedance vs. Frequency
100
90
Cathode Current (mA)
IKA
70
60
150
R1 (10K)
80
Stable
Stable
50
o
TA=25 C
40
VKA=VREF
30
20
VKA=10V:No oscillation
10
0
0.001
R2
VKA= 5V:No oscillation
VKA=15V:No oscillation
0.01
0.1
1
10
Load Capacitance (µF)
Figure 15. Stability Boundary Conditions vs. Load Capacitance
Nov. 2005 Rev. 1. 1
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Typical Performance Characteristics (Continued)
5
Input and Output Voltage (V)
Input
Output
4
220
Pulse
Generator
f=100KHz
3
Output
2
50
1
GND
0
0
2
4
6
Time (µS)
Figure 16. Pulse Response of Input and Output Voltage
Nov. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Typical Application
R3
V OUT
VIN
R1
VOUT=(1+R1/R2)
V REF
AS431
R2
Figure 17. Shunt Regulator
VIN
VOUT
R1
R4
VOUT=(1+R2/R3)*VREF
R2
VREF
AS431
R3
Figure 18. High Current Shunt Regulator
R2
V IN
Iout
IOUT=VREF/R2 + IKA
R1
AS431
Figure 19. Current Source or Current Limit
Nov. 2005 Rev. 1. 1
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Typical Application (Continued)
VIN
AZ1117
R1
8.2K
VOUT
Adjust
5V, 1A
R2
250
AS431
R3
250
Figure 20. Precision 5V 1A Regulator
R3
C1
R4
VOUT
R2 680
R5
R1
U2
Q1
3
COMP
C2
2
AS431
PWM Controller
VFB
4
PS521
Figure 21. PWM Converter with Reference
Nov. 2005 Rev. 1. 1
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Mechanical Dimensions
TO-92
Unit: mm (inch)
1.100(0.043)
3.430(0.135)
MIN
3.700(0.146)
3.300(0.130)
1.400(0.055)
0.360(0.014)
0.510(0.020)
0.000(0.000)
0.380(0.015)
Φ1.600(0.063)
MAX
4.700(0.185)
0.380(0.015)
0.550(0.022)
14.100(0.555)
14.500(0.571)
4.300(0.169)
4.400(0.173)
4.700(0.185)
1.270(0.050)
TYP
2.440(0.096)
2.640(0.104)
Nov. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Mechanical Dimensions (Continued)
SOT-23-3
3.0 °
7.0°
R0.100(0.004)
0.900(0.035)
1.100(0.043)
7.0°
0.0°~10.0°
0.020(0.001)
0.100(0.004) 0.200(0.008)MIN
2.800(0.110)
3.000(0.118)
0.080(0.003)
0.150(0.006)
0.550(0.022)REF
1.200(0.047)
1.400(0.055)
2.300(0.091)
2.500(0.098)
0.920(0.036)
0.980(0.039)
0.100(0.004) GAUGE PLANE
4×R0.100(0.004)
0.500(0.020)
0.700(0.028)
2.0°
1.050(0.041)REF
Unit: mm(inch)
0.390(0.015)
0.450(0.018)
1.900(0.075)REF
Nov. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Mechanical Dimensions (Continued)
SOT-23-5
Unit: mm(inch)
0.300(0.012)
0.600(0.024)
1.500(0.059)
1.700(0.067)
0.100(0.004)
0.200(0.008)
2.950(0.116)
2.650(0.104)
2.820(0.111)
3.020(0.119)
0.200(0.008)
0.700(0.028)
REF
0.300(0.012)
0.400(0.016)
0°
8°
1.800(0.071)
2.000(0.079)
1.250(0.049)
1.050(0.041)
0.950(0.037)
TYP
0.000(0.000)
0.100(0.004)
1.050(0.041)
1.150(0.045)
Nov. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Mechanical Dimensions (Continued)
SOT-89
Unit: mm(inch)
4.400(0.173)
4.600(0.181)
1.630(0.064)
1.400(0.055)
1.600(0.063)
1.830(0.072)
0.000(0.000)
0.076(0.003)
1.400(0.055)*
1.200(0.047)
0.900(0.035)
3.950(0.156)
4.250(0.167)
R0.200(0.008)
2.300(0.091)
2.600(0.102)
3°
10°
0.360(0.014)
0.360(0.014)
0.360(0.014)
0.480(0.019)
0.480(0.019)
0.440(0.017)
0.440(0.017)
3.000(0.118)
0.560(0.022)
3°
10°
R0.150(0.006)
Nov. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
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