LA431
ADJUSTABLE
PRECISIONSHUNT REGULATION
General Description
The LA 431 is a low voltage three terminal adjustable shunt regulator with a guaranteed thermal stability over
applicable temperature ranges. The output voltage can be set to any value between 2.495V (VREF) to 36V
with two external resistors (please refer application circuit). The high precise Reference voltage tolerance is
available in two grades: ±0.4% and ±1.0%. This device has a typical minimum cathode current of 0.1 mA.
Active output circuitry provides a very sharp turn on characteristic, making this device excellent replacement
for Zener diodes in many applications.
Features
•
Precision reference voltage :
−
−
•
•
•
•
•
LA431O : 2.495V±0.4%
LA431N : 2.495V±1.0%
Adjustable output voltage is VREF to 36V
Sink current capability is 120mA
Low dynamic output impedance is 0.2
(typ.)
Minimum Cathode current for regulation is 0.1mA (typ.)
Plastic material has UL flammability classification 94V-0
Applications
•
•
Switching Mode Power Supply
Voltage Reference Application
Block Diagram & Symbol
Please be aware that an
Important Notice
concerning availability, disclaimers, and use in critical
applications of LSC products is at the end of this document.
LA431 Rev. 08
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LA431
ADJUSTABLE
PRECISIONSHUNT REGULATION
Ordering Information
LA 431
X X X X X
Packing
Lead
Pin-out Version
Package Type
Reference Voltage Tolerance
Reference Voltage
Tolerance
Package Type
Pin-out Version
Lead
Packing
O : ±0.4%
N : ±1.0%
H : TO92-3L
C : SOT23-3L
Blank
(TO92-3L)
1. REF
2. ANODE
3. CATHODE
P : RoHS & Halogen Free
(ref. IEC 61249-2-21)
A : Tape & Reel
A
(SOT23-3L)
1. CATHODE
2. REF
3. ANODE
R
(SOT23-3L)
1. REF
2. CATHODE
3. ANODE
Product Number
LA431OHPA
LA431NHPA
LA431OCAPA
LA431NCAPA
LA431OCRPA
LA431NCRPA
Output Voltage
Tolerance
0.4 %
1.0 %
0.4 %
1.0 %
0.4 %
1.0 %
Package
TO92-3L
TO92-3L
SOT23-3L
SOT23-3L
SOT23-3L
SOT23-3L
Lead
RoHS& Halogen Free
RoHS& Halogen Free
RoHS& Halogen Free
RoHS& Halogen Free
RoHS& Halogen Free
RoHS& Halogen Free
Packing
Taping
Taping
Taping & Reel
Taping & Reel
Taping & Reel
Taping & Reel
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LA431
ADJUSTABLE
PRECISIONSHUNT REGULATION
Pin Assignment
TO92-3L
(Top View)
LA431OHPA
LA431NHPA
3
2
1
SOT23-3L
(Top View)
LA431OCAPA
LA431NCAPA
2
3
1
1.R
2.A
3.C
1.C
2.R
3.A
SOT23-3L
(Top View)
2
3
1
LA431OCRPA
LA431NCRPA
1.R
2.C
3.A
Pin Descriptions
Pin Name
R
A
C
Pin Description
Ref
Anode
Cathode
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LA431
ADJUSTABLE
PRECISIONSHUNT REGULATION
Absolute Maximum Ratings
(at T
A
=25°C)
Note: Operate over the “Absolute Maximum Ratings” may cause permanent damage to the device.
Exposure to such conditions for extended time may still affect the reliability of the device.
Characteristics
Cathode Voltage
Continuous Cathode Current
Reference Input Current
Junction Temperature
Storage Temperature
Thermal Resistance
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
SOT23-3L
θjc
TO92-3L
SOT23-3L
θja
TO92-3L
SOT23-3L
Power dissipation
TO92-3L
Moisture Sensitivity
MSL
P
D
625
Please refer the MSL label on the IC package
bag/carton for detail
150
285
mW
80
350
°
C/W
Symbol
V
KA
I
KA
I
REF
T
J
T
STG
Rating
40
120
10
150
-40~150
110
°
C/W
Unit
V
mA
mA
°
C
°
C
Note1: Ratings apply to ambient temperature at 25°
C
Recommended Operating Conditions
Characteristics
Cathode Voltage
Cathode Current
Operating Temperature
(Operating free-air temperature)
Symbol
V
KA
I
KA
T
A
Min
V
REF
0.3
-40
Max
36
100
125
Unit
V
mA
°
C
LA431 Rev. 08
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LA431
ADJUSTABLE
PRECISIONSHUNT REGULATION
Electrical Characteristics
(T
A
=25° unless otherwise specified)
C,
Characteristics
Reference Voltage
Symbol
V
REF
Conditions
V
KA
= V
REF,
I
KA
= 1mA (Fig.1)
V
KA
= V
REF
, I
KA
= 10mA,
T
A
= -20~85° (Fig.1)
C
V
REF(DEV)
V
KA
= V
REF
, I
KA
= 10mA,
C
T
A
= -40~125° (Fig.1)
I
REF
I
REF(DEV)
R1 = 10K ,R2 =
∞,
I
KA
= 10mA (Fig.2)
R1 = 10K ,R2 =
∞,
I
KA
= 10mA
T
A
= -40~125° (Fig.2)
C
V
KA
= 10V ~V
REF
V
KA
= 36V ~10V
25
1.5
0.4
35
3.5
1.2
uA
uA
0.4 %
1.0 %
Min
2.485
2.470
20
Typ
2.495
Max
2.505
V
2.520
30
mV
Unit
Deviation of Reference Input
Voltage over full temperature
Range ( *Note 2)
Reference Input Current
Deviation of Reference Input
Current over Temperature
( *Note 2)
Ratio of the Change in
Reference Voltage to the
Change in Cathode
Voltage
Minimum Cathode Current for
Regulation
Off-state Cathode Current
Dynamic Output Impedance
∆V
REF
/
∆V
KA
I
KA
= 10mA
(Fig.2)
-1.2
-1
0.1
0.1
0.2
-2.0
mV/V
-2.0
0.3
1
0.5
mA
uA
I
KA(min)
I
KA(OFF)
Z
KA
V
KA
= V
REF
(Fig.1)
V
KA
= 36V, V
REF
= 0V (Fig.3)
V
KA
= V
REF
Frequency
≤
1KHz (Fig.1)
Note 2 : Thes speicifications are guaranteed by designed and are not tested when in mass-production.
LA431 Rev. 08
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