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IRU431LCL3IRN/a36000avaiLOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
IRU431LCL3 TR |IRU431LCL3TRIRN/a48000avaiLOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
IRU431LCL3TRIRN/a50000avaiLOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
IRU431LCL5TRIRN/a21000avaiLOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR


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IRU431LCL3-IRU431LCL3 TR-IRU431LCL3TR-IRU431LCL5TR
LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
. Data Sheet No. PD94118
International IRU431L
OR Rectifier
LOW -VOLTAGE ADJUSTABLE PRECISION
SHUNT REGULATOR
FEATURES DESCRIPTION
El SOT-23 Packages The IRU431L is a three-terminal adjustable shunt regu-
Cl Voltage Reference Initial Accuracy (1%) Iator that can also be used as a precision voltage refer-
EI Low Operating Cathode Current (80wA max) ence. Its output voltage may be set to any value be-
EI Unconditionally Stable with only lwF tween VREF(1.24V) and 15V with two external resistors
EI Adjustable Output from 1.24V to 15V as shown in the typical application circuit. Other appli-
EI 0.259 Typical Output Impedance cations of this device include being used as a merged
D Pin to Pin Compatible with TLV431 amplifier and reference in applications such as a linear
APPLICATIONS
Precision Voltage Reference
El Linear Regulator Controller
EI Secondary Side Controller for the low voltage
power supply applications
regulator or as the secondary side controller in low volt-
age power supply applications. The IRU431L only re-
quires 80WA maximum quiescent current before regu-
lating, making it ideal as an efficient voltage reference
for battery type applications. The IRU431L has tlo/o
initial accuracy.
TYPICAL APPLICATION
VIN 'N/N/V t't - p. / VOUT
K(Cathode)
IRU431 L Q We = Co
V0=VREF X(1+%)
A (Anode)
Figure 1 - Typical application of the IRU431L as a shunt regulator I voltage reference.
PACKAGE ORDER INFORMATION
Rev. 2.0
08/05/03
TA (°C) 3-PIN SOT-23 (L3) 5-PIN SOT-23 (L5)
0 To 70 IRU431LCL3 IRU431LCL5
1
International
IRU431 L TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V m) .................................................... 15V
Continuous Cathode Current Range .......................... -15mA to +15mA
Reference Current Range .......................................... -0.05mA to 15mA
Storage Temperature Range ...................................... -65°C to 150°C
Operating Junction Temperature Range ..................... JC to 150°C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device.
PACKAGE INFORMATION
3-PIN SOT-23 (L3) 5-PIN SOT-23 (L5)
TOPVIEVV TOPVIEVV
E Cathode NC E E Anode
Anode E NC E
El Ref Cathode E El Ref
9JA=336°CIW 6JA=256°CIW
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over TA=0 to 70°C, Co=1wF. Typical values refer to TA=25°C.
Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient tempera-
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage VREF IK=10mA, VKA=VREF, TA=25°C 1.228 1.240 1.252 V
IRU431 L IK=10mA, VKA=VREF 1.221 1.240 1.259
VREF Deviation over full VREFtemperature range
Ratio of VREF change to AVREF/AVKA |K=10mA, AVKA=VREF to 6V -1 -6 mV/V
cathode voltage change
Reference Pin Current lK=10mA, R1=1OKQ, R2=open 0.15 1 WA
IREF Deviation over full |REF(DEV) lK=10mA, R1=10KQ, R2=open 0.05 wA
temperature range
Minimum Cathode Current IK(M|N) VKA=VREF 55 80 wA
Off State Cathode Current Ioff VKA=6V, VREF=OV 0.6 0.75 wA
VKA=10V, VREF=0V 1 .8 5
VKA=15V, VREF=0V 3.2 10
Dynamic Impedance 2on VKA=VREF, f<1KHz, 0.25 0.4 ft
IK=0.1 to 15mA, Note 1
Note I: The dynamic impedance when VKA=VREF is de- When the device is operating with two external resistors
fined as: (See Figure 3), the total dynamic impedance of the cir-
AV cuit is given by:
|on = KA
AIK AV RI
IZKAI=W=|ZKAO| M 1+2
2 Rev. 2.0
08/05/03
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