-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR SOT23-5 package 0.5

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-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR SOT23-5 package 0.5

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IRU431L/IRU431AL
-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SOT23-5 package 0.5% Voltage Reference Initial Accuracy (IRU431AL) Operational Cathode Current (80µA max) Unconditionally Stable with only Adjustable Output from 1.24V 0.25 Typical Output Impedance Compatible with TLV431
DESCRIPTION
IRU431L three-terminal adjustable shunt regulator that also used precision voltage reference. output voltage value between Vref(1.24V) with external resistors shown typical application circuit. Other applications this device include merged amplifier reference applications such linear regulator secondary side controller voltage power supply applications. IRU431L only requires 80µA maximum quiescent current before regulating, making ideal voltage reference battery type applications.
APPLICATIONS
Precision Voltage Reference Linear Regulator Controller Secondary Side Controller Voltage Power Supply Applications
TYPICAL APPLICATION
IRU431
431app1-1.0
Vref Typical application IRU431L shunt regulator voltage reference
PACKAGE ORDER INFORMATION
(°C) 5-LEAD SOT23-5 MARK IRU431LCL5 431L IRU431ALCL5 431A 3-LEAD SOT-23 MARK IRU431LCL3 431L IRU431ALCL3 431A 8-PIN PLASTIC SOIC IRU431LCS IRU431ALCS
Rev. 5/10/99
IRU431L/IRU431AL
ABSOLUTE MAXIMUM RATINGS
Input Voltage Continuous Cathode Current Range Reference Current Range Storage Temperature Range Operating Junction Temperature Range -15mA +15mA -0.05mA -65°C 150°C 150°C
PACKAGE INFORMATION
5-PIN SOT-23
VIEW
3-PIN SOT-23 (L3)
VIEW
8-PIN PLASTIC SOIC
VIEW
Anode Anode
Cathode
Cathode Anode
Anode
Cathode
450°C/W
450°C/W
JA=160°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Ta=0 =1µF. Typical values refer Ta=25 duty cycle pulse testing used which keeps junction case temperatures equal ambient temperature. PARAMETER TEST CONDITION UNITS Reference Voltage Vref IK=10mA, VKA=Vref, Ta=25°C 1.228 1.240 1.252 IRU431L IK=10mA, VKA=Vref 1.221 1.240 1.259 Reference Voltage Vref IK=10mA, VKA=Vref, Ta=25°C 1.234 1.240 1.246 IRU431AL IK=10mA, VKA=Vref 1.228 1.240 1.252 Vref deviation over full Vref(dev) VKA=Vref, IK=10mA temperature range Note Ratio Vref change dVref/dV IK=10mA, KA=Vref mV/V cathode voltage change Reference current IK=10mA, R1=10k, R2=open 0.15 Iref deviation over full Iref(dev) IK=10mA, R1=10k, R2=open 0.05 temperature range Note Minimum cathode current IK(min) VKA=Vref state cathode current Ioff VKA=6V, Vref=0V 0.75 VKA=10V, Vref=0V VKA=15V, Vref=0V Dynamic impedance Zka0 VKA=Vref, kHz, 0.25 IK=0.1 Note
Note deviation parameters, Vref(dev) Iref(dev) defined differences between maximum minimum values obtained over rated temperature range. average full range temperature coeficient reference input voltage defined Vref (dev Vref(25° Vref Where: Vref unit ppm/° rated operating free temperature device. Vref positive negative depending whether minimum Vref maximum Vref, respectively occurs lower temperature.
Note Thedynamic impedance when Vref defined Zka0 When device operating with external resistors (see Figure total dynamic impedance circuit given Zka0
Rev. 5/10/99
IRU431L/IRU431AL
DESCRIPTIONS
SOT-23 5-PIN PIN# SOT-23 3-PIN PIN# 8-PIN SOIC PIN# SYMBOL Cathode Description resistor divider from this cathode ground sets output voltage. output shunt regulator. minimum capacitor must connected from this Anode insure unconditional stability. Ground pin. This must connected lowest potential system other pins must higher potential with respect this pin. These pins connected internally.
Anode
2,4,5,7
BLOCK DIAGRAM
Cathode
1.24V
431blk1-1.0
Anode
Figure Simplified block diagram IRU431L
Rev. 5/10/99
IRU431L/IRU431AL
APPLICATION INFORMATION
Output Voltage Setting IRU431L programmed voltages range 1.24 with addition external resistors according following formula: Vref Iref IRU431L keeps constant voltage 1.240V between ground pin. placing resistor across these pins constant current flows through adding Iref current into resistor producing voltage equal (1.240/R2)*R1 Iref which will added 1.240V output voltage shown above equation. Since input bias current 0.5µA max, adds very small error output voltage most applications ignored. example, typical 3.3V application where R2=1.21k R1=2k error Iadj only which about 0.03% nominal point. maximum value biasing resistor calculated using following equations:
VMIN
Where VMIN Minimum supply voltage
Maximum load current Maximum bias current Maximum value minimum
cathode current spec Current through Assuming R1=2k before,
1.24 0.08 1.03 1.11
1.11+ Selecting
431app2-1.0
IRU431
maximum power dissipation resistor calculated under maximum supply voltage follows: (VMAX (MAX Where
VMAX Maximum supply voltage Maximum power dissipation 3.3) (MAX Thermal Design
Figure Typical application IRU431L programming output voltage Biasing Resistor (RB) Selection biasing resistor selected such that does limit input current under minimum input supply maximum load biasing current. example given below properly select biasing resistor. Assuming: VMIN VMAX 10mA
IRU431L offered plastic 8-pin SOIC surface mount SOT23-5 packages. 8-pin SOIC package maximum power dissipation capability 775mW Ta=25°C with derating factor -6.2mW °C.The SOT23-5 package maximum power dissipation capability 150mW =25°C with derating factor -1.2mW Table below summarizes maximum power dissipation capability each package versus ambient temperature. Ambient Temperature (Ta)
8-Pin SOIC 775mW SOT23-5 150mW 682mW 132mW 620mW 120mW 558mW 108mW 496mW 96mW
Rev. 5/10/99
IRU431L/IRU431AL
previous example, maximum power dissipation device calculated under load maximum input supply condition. maximum power calculated using following equation: VMAX PMAX Where PMAX Maximum power dissipation 431L example PMAX shown power dissipation table, both packages handle this power dissipation. Stability IRU431L many different regions stability domain function cathode current which typical characteristics three-terminal shunt regulators. However, general device will unconditionaly stable cathode current capacitor, bigger connected from cathode anode pins. cathode current always kept higher than under minimum line maximum load conditions, 0.01µF system will stable.
Rev. 5/10/99
IRU431L/IRU431AL
TYPICAL APPLICATION
I740 Application
VOUT
431app3-1.2
Figure cost 3.3V 2.7V output Intel I740 application.
Desig C1,2 R3,R4
Description Shunt Regulator Capacitor Resistor Resistor Resistor Heat Sink
Part Manuf IRU431L Elect,220µF,6.3V,ECAOJFQ221 Panasonic 6.2k, 118, 100, minimum square copper area load current
2-10
Rev. 5/10/99

-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR SOT23-5 package 0.5

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