ELM0431BA 2.5V Programable shunt regulator

http://www.elm-tech.com■General description

ELM0431BA is 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 (Vref) to 29V with two 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 typicaldynamic impedance of 0.25Ω. The characteristics of these reference make it excellent 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.
ELM0431BA shunt regulator is available in a SOT-23 package.

■Features• Low cost solution• Shunt capacity: 100mA• Output voltage range(adj.) : Set up to 29V• Output impedance: Typ.0.25Ω
• Trimmed band-gap design : 1%
• Package: SOT-23(ELM0431BA)■Application• Linear regulator• Precision voltage reference• Switching power supplies• Battery operating equipment• Instrumentation■Maximum absolute ratings
Parameter
Cathode-Anode reverse breakdown voltage
Cathode –Anode current
Reference input current

Symbol
VkaIkaIref

Power dissipation (Ta=25°C)

PdJunction temperature
Operationg temperature (Tj <150°C)
Storage temperature

TjTopTstg

Limit
30
100
10200 (*1)
500 (*2)
150-40 to +125-65 to +150

Unit
VmA
mA
mW°C°C°C* 1. No mounted, IC alone.
* 2. When mounted on glass epoxy 2-layers PCB (EIJ/JEDEC standard size: 76.2 mm×114.3 mm×1.6 mm), Cu thickness 35 μm,copper foil area ratio 20% on the front side, back side 100% .

■Selection guide
ELM0431BA-SSymbolabc

Package
Product version
Taping direction* Taping direction is one way.

B: SOT-23(ELM0431BA)A
S: Refer to PKG file

ELM0431 B A - S↑ ↑ ↑a b c

Rev.1.4
1/5

ELM0431BA 2.5V Programable shunt regulator
http://www.elm-tech.com■Pin configuration(TOP VIEW)
Pin No.
123

Pin name
REFERENCECATHODEANODE■Circuit
Cathode(K)Reference(R)Anode(A)■Typical application

Vout=(1+R1/R2)Vref

Shunt regulator■Block diagram

Rev.1.42/5

ELM0431BA 2.5V Programable shunt regulator
http://www.elm-tech.com■Electrical characteristics

Vka=Vref, Ik=10mA, Top=25°C, unless otherwise statedParameter
SymbolCondition
Min.
Typ.
Max.
Unit Note
Reference voltage
Vref
2.470 2.495 2.520
V1
Reference voltage
ΔVref/
0.07
0.20 mV/°C 1with temperature
ΔTop-2.7-1.0
Ration of change inVref/ Vref to 10VmV/V 2
Vref to cathode voltage
Vin 10V to 30V-2.0-0.40.3
Reference input current
Iref
0.7
4.0μA
2
Iref temperature deviation
ΔIref Ta=-20 to 85°C
0.4
1.2μA
2
Min. Ik for regulation
Ik(min)0.4
1.0mA
1Stand-by current
Istandby Vref=0V, Vka=30V
0.1
1.0μA
3
Dynamic output impedanceZout f≤1kHz, Ik=1 to 100mA
0.25
0.50
Ω
1

Note : test circuit No.

■Test circuits
Vin

Vka

Iref

Vka

VinIk

R1
Vref

Iref

Ik

R2

Test circuit 1 : Vka=Vref

Test circuit 2 : Vka>Vref

Vka

Vin

Ik(off)

Test circuit 3 : Off state current

Rev.1.4
3/5

ELM0431BA 2.5V Programable shunt regulatorhttp://www.elm-tech.com■Typical characteristics
Cathode Current

Cathode Current
VS. Cathode Voltage

VS. Cathode Voltage

Ratio of Delta Reference Voltage to Delta Cathode Voltage
VS. Junction Temperaturerz (Ω)

ΔVref /ΔVz (-mV/V)

Reference Impedance
VS. Junction Temperature

ΔVz = 3V to 30V

Off-State Cathode Current
VS. Junction Temperature
Reference Voltage
VS. Junction Temperature

Rev.1.44/5

ELM0431BA 2.5V Programable shunt regulator
http://www.elm-tech.com

Stability Boundary Condition

Cathode current Ik (mA)

8070

(Rin=30�, Ta=25�) (Test circuit1,2)A : Vka=2.5V
B : Vka=10V60

StableA5040

StableA30
20
100 -3
10B

B

10-2
10-1
100
Load capacitance CL(�F)

101■Markinga to e : Assembly lot No.
A to Z (I, O, X excepted) and 0 to 9

Rev.1.4
5/5