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PDF AN431 Data sheet ( Hoja de datos )
| Número de pieza | AN431 | |
| Descripción | ADJUSTABLE PRECISION SHUNT REGULATORS | |
| Fabricantes | BCD Semiconductor | |
| Logotipo |  |
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A Product Line of
Diodes Incorporated
AN431
ADJUSTABLE PRECISION SHUNT REGULATORS
Description
The AN431 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 AN431 precision reference is offered in two voltage tolerance:
0.5% and 1.0%.
These ICs are available in SOT-23 package.
Features
Programmable Precise Output Voltage from 2.5V to 36V
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 100mA
Low Output Noise
Wide Operating Range of -40 to +125oC
Lead-Free Packages: SOT-23
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
Lead-Free Packages, Available in “Green” Molding Compound:
SOT-23
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
ANODE
3
1
CATHODE
2
REF
SOT-23
Applications
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
R3
VIN
R1
VREF
R2
VOUT
AN431 VOUT=(1+R1/R2)*VREF
AN431
Document number: DS37414 Rev. 3 - 2
Shunt Regulator
1 of 13
www.diodes.com
April 2015
© Diodes Incorporated
1 page  
Electrical Characteristics (@TA=+25ºC, unless otherwise specified.)
A Product Line of
Diodes Incorporated
AN431
Symbol
VREF
∆VREF
∆VREF
∆VKA
IREF
∆IREF
IKA (Min)
IKA (Off)
ZKA
θJC
Parameter
Reference
Voltage
0.5%
1.0%
Deviation of Reference Voltage
Over Full Temperature Range
Ratio of Change in Reference
Voltage to the Change in Cathode
Voltage
Reference Current
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
Off-state Cathode Current
Dynamic Impedance
Thermal Resistance
Test
Circuit
4
4
5
5
5
4
6
4
–
Conditions
Min
VKA=VREF, IKA=10mA
VKA=VREF,
IKA=10mA
0 to +70oC
-40 to +85oC
-40 to +125oC
2.487
2.475
–
–
–
IKA=10mA
∆VKA=10V to VREF
∆VKA=36V to 10V
IKA=10mA, R1=10KΩ, R2=∞
IKA=10mA, R1=10KΩ, R2=∞,
TA=-40 to +125oC
VKA=VREF
–
–
–
–
VKA=36V, VREF=0
VKA=VREF, IKA=1 to 100mA,
f≤1.0kHz
SOT-23
–
–
–
Typ
2.500
2.500
4.5
4.5
4.5
-1.0
-0.5
0.7
0.4
0.4
0.05
0.15
135
Max
2.512
2.525
8
10
16
-2.7
-2.0
4
1.2
1.0
1.0
0.5
–
Unit
V
mV
mV/V
µA
µA
mA
µA
Ω
ºC/W
AN431
Document number: DS37414 Rev. 3 - 2
5 of 13
www.diodes.com
April 2015
© Diodes Incorporated
5 Page 
Package Outline Dimensions (All dimensions in mm(inch).)
(1) Package Type: SOT-23
A Product Line of
Diodes Incorporated
AN431
0.500(0.020)
0.700(0.028)
3.0 °
4×R0.100(0.004)
0.100(0.004) GAUGE PLANE
7.0°
0.900(0.035)
1.100(0.043)
R0.100(0.004)
2.0°
1.050(0.041)REF
0.010(0.0004) 0.0°~10.0°
0.100(0.004) 0.200(0.008)MIN
2.800(0.110)
3.000(0.118)
0.550(0.022)REF
7.0°
0.080(0.003)
0.180(0.007)
2.300(0.091)
2.500(0.098)
1.200(0.047)
1.400(0.055)
0.890(0.035)
1.030(0.041)
1.900(0.075)REF
0.300(0.012)
0.510(0.020)
AN431
Document number: DS37414 Rev. 3 - 2
11 of 13
www.diodes.com
April 2015
© Diodes Incorporated
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