IRU431L IRU431AL -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DE

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IRU431L IRU431AL -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DE

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Data Sheet PD94118
IRU431L IRU431AL
-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR 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 being used 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.
FEATURES
SOT-23 SOIC Packages 0.5% Voltage Reference Initial Accuracy (IRU431AL) Operating Cathode Current (80µA max) Unconditionally Stable with only Adjustable Output from 1.24V 0.25 Typical Output Impedance Compatible with TLV431
APPLICATIONS
Precision Voltage Reference Linear Regulator Controller Secondary Side Controller Voltage Power Supply Applications
TYPICAL APPLICATION
VOUT
IRU431L
Vref
Figure Typical application IRU431L shunt regulator voltage reference.
PACKAGE ORDER INFORMATION
(°C) 5-PIN SOT-23 (L5) IRU431LCL5 IRU431ALCL5 MARK 431L 431A 3-PIN SOT-23 (L3) IRU431LCL3 IRU431ALCL3 MARK 431L 431A 8-PIN PLASTIC SOIC IRU431LCS IRU431ALCS
Rev. 07/13/01
IRU431L IRU431AL
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) Continuous Cathode Current Range Reference Current Range Storage Temperature Range Operating Junction Temperature Range -15mA +15mA -0.05mA -65$C 150$C 150$C
PACKAGE INFORMATION
5-PIN SOT-23 (L5)
VIEW
3-PIN SOT-23 (L3)
VIEW Cathode
8-PIN PLASTIC SOIC
VIEW
Cathode
Anode
Cathode Anode
Anode
Anode
450°C/W
450°C/W
JA=160°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Ta=0 70$C, =1µF. Typical values refer Ta=25$C. duty cycle pulse testing used which keeps junction case temperatures equal ambient temperature. PARAMETER Reference Voltage Vref IRU431L Reference Voltage Vref IRU431AL Vref deviation over full Vref(dev) temperature range Ratio Vref change Vref/VKA cathode voltage change Reference current Iref deviation over full Iref(dev) temperature range Minimum cathode current IK(min) state cathode current Ioff TEST CONDITION IK=10mA, VKA=Vref, Ta=25$C IK=10mA, VKA=Vref IK=10mA, VKA=Vref, Ta=25$C IK=10mA, VKA=Vref VKA=Vref, IK=10mA Note IK=10mA, dVKA=Vref IK=10mA, R1=10K, R2=open IK=10mA, R1=10K, R2=open Note VKA=Vref VKA=6V, Vref=0V VKA=10V, Vref=0V VKA=15V, Vref=0V VKA=Vref, f<1KHz, IK=0.1 15mA, Note 1.228 1.221 1.234 1.228 1.240 1.240 1.240 1.240 0.15 0.05 0.25 1.252 1.259 1.246 1.252 UNITS mV/V
Dynamic Impedance
ZKA0
0.75
Note deviation parameters, Vref(dev) Iref(dev) defined differences between maximum minimum values obtained over rated temperature range. average full range temperature coefficient reference input voltage defined Vref(dev) Vref(25$C)
Where: 'Vref' unit ppm/$C rated operating free temperature device. Vref positive negative depending whether minimum Vref maximum Vref respectively occurs lower temperature.
'Vref'
Rev. 07/13/01
IRU431L IRU431AL
Note dynamic impedance when VKA=Vref defined 'ZKA0' When device operating with external resistors (See figure total dynamic impedance circuit given 'ZKA' 'ZKA0'
DESCRIPTIONS
SOT-23 5-PIN PIN# SOT-23 3-PIN PIN# 8-PIN SOIC PIN# SYMBOL Cathode DESCRIPTION Resistors from cathode ground form divider that sets output voltage. output shunt regulator. capacitor minimum value 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
BLOCK DIAGRAM
Cathode
1.24V
Anode
Figure Simplified block diagram IRU431L
Rev. 07/13/01
IRU431L IRU431AL
APPLICATION INFORMATION
Output Voltage Setting IRU431L programmed voltages range 1.24 with addition external resistors according following formula: Vref Iref maximum value biasing resistor calculated using following equations: RB(MAX) VMIN IB(MAX) IL(MAX)
IB(MAX) IK(MIN) Where: VMIN Minimum supply voltage IL(MAX) Maximum load current IB(MAX) Maximum bias current IK(MIN) Maximum value minimum cathode current spec Current through Assuming before, 1.24 1.03mA 1.11
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 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.
IB(MAX) 0.08 1.03 1.11mA RB(MAX)
431app2-1.0
Selecting maximum power dissipation resistor calculated under maximum supply voltage follows: (MAX)
IRU431L
(VMAX VKA)
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 4.5V VMAX 3.3V 10mA
Where: VMAX Maximum supply voltage (MAX) Maximum power dissipation
(MAX)
3.3) 73mW
Thermal Design IRU431L offered plastic 8-pin SOIC surface mount SOT-23 packages. 8-pin SOIC package maximum power dissipation capability 775mW Ta=25°C with derating factor -6.2mW/ SOT-23 package maximum power dissipation capability 150mW =25°C with derating factor -1.2mW
Rev. 07/13/01
IRU431L IRU431AL
table below summarizes maximum power dissipation capability each package versus ambient temperature. Ambient Temperature (Ta)
682mW 132mW 620mW 120mW 558mW 108mW
496mW 96mW
8-Pin SOIC 775mW SOT-23 150mW
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 89mW shown power dissipation table, both packages handle this power dissipation.
Stability IRU431L many different domains stability function cathode current. typical threeterminal shunt regulators, IRU431L many domains stability. actual domain which practical circuit operates related cathode current. general device will unconditionally stable cathode current capacitor, larger, connected between cathode anode. cathode current always higher than under minimum line maximum load conditions, capacitor value reduced 0.01µF system will stable.
Rev. 07/13/01
IRU431L IRU431AL
TYPICAL APPLICATION
I740 Application
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
WORLD HEADQUARTERS Kansas St., Segundo, California 90245, Tel: (310) 252-7105 Fax: (310) 252-7903 Visit www.irf.com sales contact information. Data specifications subject change without notice. 02/01
Rev. 07/13/01

IRU431L IRU431AL -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DE

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