Low Voltage Adjustable Precision
Shunt Regulator
LA431LA LA431LB
Low Voltage Adjustable Precision Shunt Regulator
General Description
• LA431LA and LA431LB are Low Voltage three terminal Adjustable Precision
Shunt Regulators, With guaranteed thermal stability over a full operation range.
• The output Voltage of these ICs can be set to any value between VREF (Typical 1.240V)
and 18V with two external resistors.
• These devices feature the sharp turn-on characteristics,low temperature coefficient
and low output impedance, making them ideal substitute for Zener Diode in many
applications such as switching power supplies, charger and other adjustable regulators
TO-92
(Bulk)
TO-92
(Ammo)
• LA431L precision reference Voltage tolerance is offered in 2 grades:1.0% for LA431LA
and 0.5% for LA431LB
• Both LA431LA and LA431LB are available in TO-92 (Bulk), TO-92 (Ammo),SOT-89,
SOT-23 and SOT-23-5 packages.
SOT-89
.Features
•
•
•
•
•
•
•
•
•
Programmable Precise Output Voltage:1.240V to 18V
High Stability under Capacitive Load
Wide Operation Temperature Range:-40°C to 125°C
Low Temperature Deviation:3.0mV (Typical)
Low Equivalent Full-range Temperature Coefficient :20ppm/°C (Typical)
Low Dynamic Output Rresitance:0.05Ω (Typical)
Sink Current Capacity:0.1mA to 100mA
Low Output Noise
RoHS Compliance and Halogen Free
SOT-23
SOT-23-5
Applications
•
•
•
•
•
Switching Power Supply
Charger
Voltage Adapter
Graphic Card
PC Motherboard
TAITRON COMPONENTS INCORPORATED www.taitroncomponents.com
Tel:
Fax:
(800)-TAITRON (800)-824-8766
(800)-TAITFAX (800)-824-8329
(661)-257-6060
(661)-257-6415
Rev. A/LX
Page 1 of 13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
Ordering Information
Pin Configuration
1: REF 2: ANODE
3: CATHODE
TO-92(Bulk)
1: REF
2: CATHODE 3: ANODE
SOT-23
1: REF 2: ANODE
3: CATHODE
1: REF 2: ANODE
TO-92(Ammo)
3: CATHODE
SOT-89
1:NC 2:NC
3: CATHODE 4: REF 5: ANODE
SOT-23-5
Rev. A/LX
www.taitroncomponents.com
Page 2 of {13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
Functional Block Diagram
Marking information
Outline
Temperatue
Range
VREF
Tolerance
1.0%
TO-92
-40 to 125°C
0.5%
SOT-89
-40 to 125°C
SOT-23
-40 to 125°C
SOT-23
-5
-40 to 125°C
1.0%
0.5%
1.0%
0.5%
1.0%
0.5%
RoHS
Part Number
Halogen Free
LA431LAZ-08-AR
LA431LAZ-08-AG
LA431LAZ-08-BL
LA431LAZ-08-BG
LA431LBZ-08-AR
LA431LBZ-08-AG
LA431LBZ-08-BL
LA431LBZ-08-BG
LA431LAK-08-TR70
Marking Code
Packing
Halogen Free T Type
RoHS
AZ431LBZ-E1
AZ431LBZ-G1
AZ431LAZ-E1
AZ431LAZ-G1
LA431LAK-08-RG70
E41B
G41B
LA431LBK-08-TR70
LA431LBK-08-RG70
E41A
G41A
LA431LAN-08-TR70
LA431LAN-08-RG70
EA7
GA7
LA431LBN-08-TR70
LA431LBN-08-RG70
EA6
GA6
LA431LAN5-08-TR70
LA431LAN5-08-RG70
E6A
G6A
LA431LBN5-08-TR70
LA431LBN5-08-RG70
E5A
G5A
Ammo
Bulk
Ammo
Bulk
Tape
& Reel
Tape
& Reel
Tape
& Reel
Rev. A/LX
www.taitroncomponents.com
Page 3 of {13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
Absolute Maximum Ratings (Note1)
Symbol
Description
Ratings
Unit
VKA
IKA
IREF
Cathode Voltage
Continuous Cathode Current
Reference Input Current
Z:TO-92
Power
K: SOT-89
Dissipation
N:SOT-23
N5:SOT-23-5
Junction Temperature
Storage Temperature Range
ESD
20
-100 to 100
10
V
mA
mA
PD
TJ
TSTG
ESD(Human body model)
770
mW
370
150
-65 to 150
2000
°C
°C
V
Recommend Operating Ratings(Note1)
Symbol
Description
VKA
IKA
TA
Cathode Voltage
Continuous Cathode Current
Operating Ambient Temperatrue
Ratings
Min
Max
18
VREF
0.1
100
-40
125
Unit
V
mA
°C
Note1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Recommend
Opertaing ratings indicate conditions for which the devices is functional,but do not guarantee specific specifation
limits. for guarantee specifation and test conditions,see the Electrical Charctristics, the guarantee specifation
apply only for the test conditions listed.Some performance characteristics may degrade when the device is not
operated under the listed test conditions.
Electrical Characteristics (TA=25°C, unless otherwise specified)
Symbol
VREF
∆ VREF
∆ VREF
∆ VKA
IREF
Description
Reference
Voltage
0.5%
1%
Deviation of Reference Voltage
Over Full Temperature Range
Ratio of change in Reference
Voltage to the change in
Cathode Voltage
Reference Current
Min.
Typ.
Max.
Unit
Test
Circuit
Test Conditions
1.234
1.228
-
1.240
1.240
2
3
4
1.246
1.252
10
10
15
V
V
Fig.1
VKA=VREF,IKA=10mA
mV
Fig.1
-
-0.5
-1.5
mV/ V
Fig.2
∆ VKA= VREF to 16V
IKA=10mA
-
0.15
0.4
uA
Fig.2
IKA=10mA,R1=10KΩ,R2=∞
0°C to 70°C
-40°C to 85°C
-40°C to125°C
VKA=VREF
IKA=10mA
Rev. A/LX
www.taitroncomponents.com
Page 4 of {13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
∆ IREF
Deviation of Reference Current
Over Full Temperature Range
-
0.1
0.4
uA
Fig.2
IKA=10mA, R1=10KΩ,R2=∞
TA =-40°C to125°C
IKA(Min)
Minimum Cathode Current for
Regulation
-
55
80
uA
Fig.1
VKA=VREF
IKA(Off)
Off-state Cathode Current
-
0.04
0.01
0.10
0.05
uA
uA
Fig.3
Dynamic Impedance
-
0.05
0.15
Ω
Fig.1
Thermal Resisitance
-
140.8
88.0
84.84
84.84
° C/W
-
ZKA
VKA=18V, VREF=0V
VKA=6V, VREF=0V
VKA=VREF, IKA=1mA to
100mA,f≤1.0KHz
Z:TO-92
K: SOT-89
N:SOT-23
N5:SOT-23-5
Parameter Test Circuit
Fig.1 Test Circuit for VKA=VREF
Fig.2 Test Circuit for VKA>VREF
Fig.3 Test Circuit for IKA(Off)
Rev. A/LX
www.taitroncomponents.com
Page 5 of {13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
Typical Characteristics Curves
Fig.4 VREF-TA
Fig.5 IREF-TA
R1=10K Ω
Operation Ambient Temperature TA (° C)
Operation Ambient Temperature TA (° C)
Cathode Current IKA (mA)
Cathode Voltage VKA (V)
Fig.7 IKA-VKA
Cathode Current IKA (uA)
Fig.6 IKA-VKA
VKA=VREF
TA=25 ° C
R2= ∞
IKA=10mA
Reference Current IREF (uA)
Reference Voltage VREF (V)
VKA=VREF
IKA=10mA
VKA=VREF
TA=25 ° C
Cathode Voltage VKA (V)
Rev. A/LX
www.taitroncomponents.com
Page 6 of {13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
Ratio of change in Reference Voltage
to the change in Cathode Voltage
(mV/V)
Fig.8 ∆ VREF -TA
∆ VKA
IKA-=10mA
∆VKA=VREF to 16V
Operation Ambient Temperature TA (° C)
Fig.9 VG-f
Voltage Gain VG (dB)
TA=25 ° C
IKA=10mA
Small Signal Frequency f (Hz)
Rev. A/LX
www.taitroncomponents.com
Page 7 of {13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
Dynamic Impedance (Ω)
Fig.10 ZKA-f
IKA=1mA to100mA
Frequency f (Hz)
Output and Input Voltage VOUT/VIN (V)
Fig.11 Pulse Respond of Input and Output Voltage
Input
Output
Time (uS)
Rev. A/LX
www.taitroncomponents.com
Page 8 of {13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
Typical Application Circuit
Fig.12 Shunt Regulator
Fig.14 Current Source or Current Limit
Fig.13 High Current Shunt Regulator
Fig.15 Precision 5V 1 A Regulator
Fig.16 PWM Converter With Reference
Rev. A/LX
www.taitroncomponents.com
Page 9 of {13
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
Dimensions in mm (inch)
TO-92 Buck
TO-92 Ammo
Rev. A/LX
www.taitroncomponents.com
Page 10 of
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
SOT-89
SOT-89
Rev. A/LX
www.taitroncomponents.com
Page 11 of
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
SOT-23
SOT-23-5
Rev. A/LX
www.taitroncomponents.com
Page 12 of
Adjustable Precision Shunt Voltage Regulator
LA431LA LA431LB
How to contact us:
US HEADQUARTERS
28040 WEST HARRISON PARKAWAY, VALENCIA, CA 91355-4162
Tel: (800) TAITRON (800) 824-8766 (661) 257-6060
Fax: (800) TAITFAX (800) 824-8329 (661) 257-6415
Email: [email protected]
Http://www.taitroncomponents.com
TAITRON COMPONENTS MEXICO, S.A .DE C.V.
BOULEVARD CENTRAL 5000 INTERIOR 5 PARQUE INDUSTRIAL ATITALAQUIA, HIDALGO C.P.
42970 MEXICO
Tel: +52-55-5560-1519
Fax: +52-55-5560-2190
TAITRON COMPONETS INCORPORATED E REPRESENTAÇÕES DO BRASIL LTDA
RUA DOMINGOS DE MORAIS, 2777, 2.ANDAR, SALA 24 SAÚDE - SÃO PAULO-SP 04035-001 BRAZIL
Tel: +55-11-5574-7949
Fax: +55-11-5572-0052
TAITRON COMPONETS INCORPORATED, SHANGHAI REPRESENTATIVE OFFICE
METROBANK PLAZA, 1160 WEST YAN’ AN ROAD, SUITE 1503, SHANGHAI, 200052, CHINA
Tel: +86-21-5424-9942
Fax: +86-21-5424-9931
Rev. A/LX
www.taitroncomponents.com
Page 13 of