L431L Niko Semiconductor Co., Ltd., L431L Datasheet

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L431L

Manufacturer Part Number
L431L
Description
1.24V Low-Voltage Adjustable Precision Shunt Regulator
Manufacturer
Niko Semiconductor Co., Ltd.
Datasheet
NIKO-SEM
GENERAL DESCRIPTION
The L431L is a three-terminal adjustable shunt
regulator utilizing an accurate 1.24V band gap
reference. The output voltage can be set to any
value between 1.24V (V
external resistors as shown in the typical
application circuit. The device exhibit a wide
operating current range of 0.2 to 100 mA with a
typical dynamic impedance of 0.25Ω. Active
output circuitry provides a very sharp turn-on
characteristic, making the L431L excellent re-
placements for low-voltage zener diodes in
many applications, including on-board regulat-
ion and adjustable power supplies.
When used with an opto-coupler, the L431L is
ideal voltage reference in isolated feedback
circuits for 3.3V switching-mode power supplies.
The L431L shunt regulator is available in two
voltage tolerances (0.5% & 1.0%) and three
package options (TO-92, SOT-23-3 and SO-8).
SYMBOL & BLOCK DIAGRAM
Reference (R)
SYMBOL
Cathode (K)
Anode (A)
REF
1.24V Low-Voltage Adjustable
) to 18V with two
Precision Shunt Regulator
Reference
(R)
FUNCTIONAL BLOCK DIAGRAM
1
1.24 Vref
FEATURES
APPLICATIONS
TS431, SC431L & AS432
Internal amplifier with 100 mA capability
Programmable output voltage to 18V
0.25Ω typical output impedance
Pin to pin compatible with TLV431A,
Trimmed bandgap design 0.5% & 1.0%
with three package options
Low output noise
Linear regulator controller
Precision voltage reference
Switching power supplies
Battery operating equipment
Instrumentation
PCs, Computer disk drives
+
-
Anode (A)
Cathod
(K)
APR-25-2002
L431L

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L431L Summary of contents

Page 1

... When used with an opto-coupler, the L431L is ideal voltage reference in isolated feedback circuits for 3.3V switching-mode power supplies. The L431L shunt regulator is available in two voltage tolerances (0.5% & 1.0%) and three package options (TO-92, SOT-23-3 and SO-8). SYMBOL & BLOCK DIAGRAM Cathode (K) ...

Page 2

... KA MIN TYP MAX UNITS V 1.228 1.240 1.252 3 2.3 6 µA 0.14 0.6 µA 0 500 nA 0.25 0.4 Ω APR-25-2002 L431L and REF TEST CIRCUIT ...

Page 3

... KA REF Applications Information – Stability Selection of load capacitance when using L431L as a shunt regulator When the L431L is used as a shunt regulator, two options for selection of CL are recommended for optimal stability load capacitance across the device, decouple at the load. 2. Large capacitance across the device, optional decoupling at the load ...

Page 4

... VS. Cathode Voltage 1.24V Low-Voltage Adjustable Precision Shunt Regulator Test Circuit for Small Signal Gain and Phase 15K 10uF L431L 2 8.25K 2 Test Circuit for Stability L431L 2 2 Cathode Current VS. Cathode Voltage APR-25-2002 L431L OUT 232 GND ...

Page 5

... NIKO-SEM Reference Voltage VS. Junction Temperature Ratio of Delta Reference Voltage to Delta Cathode Voltage VS. Junction Temperature Δ 16V to Vref 1.24V Low-Voltage Adjustable Precision Shunt Regulator 5 L431L Reference Impedance VS. Frequency Reference Input Current VS. Junction Temperature ∞ APR-25-2002 ...

Page 6

... NIKO-SEM Off-State Cathode Current VS. Junction Temperature PIN CONFIGURATIONS 1.24V Low-Voltage Adjustable Precision Shunt Regulator 6 L431L Reference Impedance VS. Junction Temperature APR-25-2002 ...

Page 7

... APPLICATION CIRCUIT Vin 5V or 12V 1.24V Low-Voltage Adjustable Precision Shunt Regulator L431LNB L431LM3B TO-92 SOT-23-3 L431LN 1LM3 1% 1% P01N02LM or P3055L Niko Cin 10uF A L431L Niko R1 Vout = ( Vref R2 7 L431LVB L431LM5B SOIC-8 SOT-23-5 L431LV 1LM5 1% 1% Vout R1 + Cout R2 L431L APR-25-2002 ...

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 1.24V 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 L 4.191 M 1.270 N 8 L431L mm Min. Typ. Max. 2.413 2.540 2.667 0.356 0.533 APR-25-2002 ...

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 1.24V Low-Voltage Adjustable Precision Shunt Regulator mm Dimension Typ. Max. H 3.00 I 1.80 J 3.10 K 1.30 L 0.10 M 0.4 0 L431L mm Min. Typ. Max. 0.10 0.15 0.25 0.37 APR-25-2002 ...

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 1.24V Low-Voltage Adjustable Precision Shunt Regulator mm Dimension Max. 5.0 H 4.0 I 6 1. L431L mm Min. Typ. Max. 0.4 1.27 0.18 0.25 0.22 0° 8° APR-25-2002 ...

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 1.24V 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 0.50 0.15 0.25 2.90 3.10 1.60 1.80 11 L431L mm Min. Typ. Max. 1.90(TYP) 2.60 2.80 3.00 0.37 APR-25-2002 ...

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