elm0431ba

ELM0431BA 2.5V Programable shunt regulator
■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 typical
dynamic 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
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■Application
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
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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
Power dissipation
Junction temperature
Storage temperature
Symbol
Vka
Ika
Iref
Pd
Tj
Tstg
Limit
30
100
10
200
150
-65 to +150
Unit
V
mA
mA
mW
°C
°C
■Selection guide
ELM0431BA-S
Symbol
a
b
c
Package
Product version
Taping direction
* Taping direction is one way.
B: SOT-23
A
S: Refer to PKG file
■Pin configuration
ELM0431 B A - S
↑ ↑ ↑
a b c
■Circuit
SOT-23(TOP VIEW)
3
1
2
Cathod(K)
Pin No.
1
2
3
Pin name
REFERENCE
CATHODE
ANODE
4- 1
Reference(R)
Anode(A)
Rev.1.1
ELM0431BA 2.5V Programable shunt regulator
■Typical application
R
Vout
Vin(batt)
R1
0.1%
Vref
ELM0431BA
R2
0.1%
Vout=(1+R1/R2)Vref
Return
Shunt regulator
■Block diagram
Reference
(R)
Cathod
(K)
�
�
2.5 Vref
Anode
(A)
■Marking
SOT-23
abcde
a to e : Assembly lot No.
A to Z (I, O, X excepted) and 0 to 9
4- 2
Rev.1.1
ELM0431BA 2.5V Programable shunt regulator
■Electrical characteristics
Vka=Vref, Ik=10mA, Top=25°C, unless otherwise stated
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit Note
Reference voltage
Vref
2.470 2.495 2.520
V
1
Reference voltage
ΔVref/
0.07
0.20 mV/°C 1
with temperature
ΔTop
-2.7
-1.0
Ration of change in
Vref/ Vref to 10V
mV/V 2
Vref to cathode voltage
Vin 10V to 30V
-2.0
-0.4
0.3
Reference input current
Iref
0.7
4.0
μA
2
Iref temperature deviation
ΔIref Ta=-20 to 85°C
0.4
1.2
μA
2
Min. Ik for regulation
Ik(min)
0.4
1.0
mA
1
Stand-by current
Istandby Vref=0V, Vka=30V
0.04
250
nA
3
Dynamic output impedance
Zout f≤1kHz, Ik=1 to 100mA
0.25
0.50
Ω
1
Note : test circuit No.
■Test circuits
Vin
Vka
Iref
Vka
Vin
Ik
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
4- 3
Rev.1.1
ELM0431BA 2.5V Programable shunt regulator
■Typical characteristics
Cathode Current
Cathode Current
VS. Cathode Voltage
VS. Cathode Voltage
Ratio of Delta Reference Voltage to Delta Cathode Voltage
VS. Junction Temperature
rz (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
4- 4
Rev.1.1