L431M3B Niko Semiconductor Co., Ltd., L431M3B Datasheet

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L431M3B

Manufacturer Part Number
L431M3B
Description
2.5V low-voltage adjustable precision shunt regulator, tolerance 1%
Manufacturer
Niko Semiconductor Co., Ltd.
Datasheet
NIKO-SEM
GENERAL DESCRIPTION
The L431 is a three-terminal adjustable shunt
regulator utilizing an accurate 2.5V band-gap
reference. The output voltage can be set to any
value between 2.5V (V
external resistors as shown in the typical
application circuit. The device exhibit a wide
operating current range of 0.4 to 100 mA with a
typical dynamic impedance of 0.25Ω. The cha-
racteristics of these reference make it exce-
llent replacements for zener diodes in many
applications such as digital voltmeters, power
supplies, and op amp circuitry. The 2.5V volt
reference makes it convenient to obtain a
stable reference from 5.0V logic supplies.
The L431 shunt regulator is available in three
voltage tolerances (0.5%, 1.0% and 2%) and
three package options (TO-92, SOT-23-3,
SOT-23-5 and SOIC-8).
SYMBOL & BLOCK DIAGRAM
Reference (R)
SYMBOL
Cathode (K)
Anode (A)
REF
) to 29V with two
2.5V Low-Voltage Adjustable
Precision Shunt Regulator
Reference
(R)
FUNCTIONAL BLOCK DIAGRAM
1
2.5 Vref
FEATURES
APPLICATIONS
Internal amplifier with 70 mA capability
Programmable output voltage to 29V
0.25Ωtypical output impedance
Pin to pin compatible with TL431, LM431
, SC431 & AS431
Trimmed band-gap design 0.5%, 1.0%
and 2% with three package options
Low cost solution
Linear regulator controller
Precision voltage reference
Switching power supplies
Battery operating equipment
Instrumentation
PCs, Computer disk drives
+
-
Anode (A)
Cathod
(K)
JAN-08-Y02
L431

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L431M3B Summary of contents

Page 1

NIKO-SEM GENERAL DESCRIPTION The L431 is a three-terminal adjustable shunt regulator utilizing an accurate 2.5V band-gap reference. The output voltage can be set to any value between 2.5V (V REF external resistors as shown in the typical application circuit. The ...

Page 2

NIKO-SEM ABSOLUTE MAXIMUM RATINGS Cathode-Anode Reverse Breakdown Voltage - V Anode-Cathode Forward Current - I Reference Input Current - I Storage Temperature Range - T Junction Temperature - T J Lead Temperature (Soldering, 10 Seconds Continuous Power at ...

Page 3

NIKO-SEM TEST CIRCUITS REF - TEST CIRCUIT REF Stability Boundary Condition For Shunt Regulation VS. Cathode Current and Load Capacitance The areas under the ...

Page 4

NIKO-SEM Small-Signal Gain and Phase Shift VS. Frequency Cathode Current VS. Cathode Voltage Reference Impedance VS. Junction Temperature 2.5V Low-Voltage Adjustable Precision Shunt Regulator Test Circuit for Small Signal Gain and Phase Ratio of Delta Reference Voltage to Delta Cathode ...

Page 5

NIKO-SEM Off-State Cathode Current VS. Junction Temperature Reference Voltage VS. Junction Temperature 2.5V Low-Voltage Adjustable Precision Shunt Regulator 5 L431 Reference Input Current VS. Junction Temperature ∞ Reference Impedance VS. Frequency JAN-08-Y02 ...

Page 6

... NIKO-SEM PIN CONFIGURATION DEVICE SELECTION GUIDE Device Package Marking Tolerance 2.5V Low-Voltage Adjustable Precision Shunt Regulator L431NB L431M3B TO-92 SOT-23-3 L431N 1M3 L431VB L431M5B SOIC-8 SOT-23-5 L431V 1M5A 1% 1% JAN-08-Y02 L431 ...

Page 7

NIKO-SEM APPLICATION CIRCUIT Vin 5V or 12V 2.5V Low-Voltage Adjustable Precision Shunt Regulator P01N02LM or P3055L Niko Cin 10uF L431 or L432 A Niko R1 Vout = ( Vref R2 ...

Page 8

NIKO-SEM Dimension Min. Typ. A 4.445 B 4.318 C 12.7 D 0.356 E 1.143 1.27 F 3.175 G 0.762 2.5V Low-Voltage Adjustable Precision Shunt Regulator TO-92 MECHANICAL DATA mm Dimension Max. 5.207 H 5.334 I 15.5 J 0.533 K 1.397 ...

Page 9

NIKO-SEM SOT-23 (M3) MECHANICAL DATA Dimension Min. A 0.95 B 2.60 2.80 C 1.40 1.60 D 2.70 2.90 E 1.00 1.10 F 0.00 G 0.35 2.5V Low-Voltage Adjustable Precision Shunt Regulator mm Dimension Typ. Max. H 3.00 I 1.80 J ...

Page 10

NIKO-SEM SOIC-8 (D) MECHANICAL DATA Dimension Min. Typ. A 4.8 B 3.8 C 5.8 D 0. 0.1 2.5V Low-Voltage Adjustable Precision Shunt Regulator mm Dimension Max. 5.0 H 4.0 I 6 1.65 ...

Page 11

NIKO-SEM SOT-23 (M5) MECHANICAL DATA Dimension Min. A 1.0 A1 0.00 A2 0.70 b 0.35 C 0.10 D 2.70 E 1.40 2.5V Low-Voltage Adjustable Precision Shunt Regulator mm Dimension Typ. Max. 1.10 1.30 e 0.10 H 0.80 0.90 L 0.40 ...

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