IRU431L -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DESCRIPTION

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IRU431L -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DESCRIPTION

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Data Sheet PD94118
IRU431L
-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 80mA maximum quiescent current before regulating, making ideal efficient voltage reference battery type applications. IRU431L initial accuracy.
FEATURES
SOT-23 Packages Voltage Reference Initial Accuracy (1%) Operating Cathode Current (80mA max) Unconditionally Stable with only Adjustable Output from 1.24V 0.25V Typical Output Impedance Compatible with TLV431
APPLICATIONS
Precision Voltage Reference Linear Regulator Controller Secondary Side Controller voltage power supply applications
TYPICAL APPLICATION
VREF
VOUT
(Cathode)
IRU431L
VREF
(Anode)
Figure Typical application IRU431L shunt regulator voltage reference.
PACKAGE ORDER INFORMATION
(°C) 3-PIN SOT-23 (L3) IRU431LCL3 5-PIN SOT-23 (L5) IRU431LCL5
Rev. 08/05/03
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IRU431L
ABSOLUTE MAXIMUM RATINGS
Input Voltage Continuous Cathode Current Range Reference Current Range Storage Temperature Range Operating Junction Temperature Range -15mA +15mA -0.05mA 15mA -658C 1508C 1508C
CAUTION: Stresses above those listed "Absolute Maximum Ratings" cause permanent damage device.
PACKAGE INFORMATION
3-PIN SOT-23 (L3)
VIEW
5-PIN SOT-23 (L5)
VIEW
Cathode
Anode
Anode
Cathode
JA=336°C/W
JA=256°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over TA=0 708C, =1mF. Typical values refer TA=258C. duty cycle pulse testing used which keeps junction case temperatures equal ambient temperature. PARAMETER TEST CONDITION IK=10mA, KA=VREF, TA=258C IK=10mA, VKA=VREF VKA=VREF, IK=10mA IK=10mA, DVKA=VREF IK=10mA, R1=10KV, R2=open IK=10mA, R1=10KV, R2=open 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 1.240 1.240 0.15 0.05 0.25 UNITS 1.252 1.259 mV/V
Reference Voltage VREF IRU431L VREF(DEV) VREF Deviation over full temperature range Ratio VREF change DVREF/DVKA cathode voltage change Reference Current IREF Deviation over full IREF(DEV) temperature range Minimum Cathode Current IK(MIN) State Cathode Current Ioff
Dynamic Impedance
ZKA0
0.75
Note dynamic impedance when VKA=VREF defined ?ZKA0? DVKA
When device operating with external resistors (See Figure total dynamic impedance circuit given ?ZKA? ?ZKA0?
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Rev. 08/05/03
IRU431L
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
REF(DEV)
REF(258C)
?aVREF
Where: ?aVREF? unit ppm/8C rated operating free temperature device. aVREF positive negative depending whether minimum VREF maximum VREF respectively occurs lower temperature.
DESCRIPTIONS
5-PIN 3-PIN SYMBOL 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.
Cathode
Anode
BLOCK DIAGRAM
Cathode
1.24V
Anode
Figure Simplified block diagram IRU431L.
Rev. 08/05/03
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IRU431L
APPLICATION INFORMATION
Output Voltage Setting IRU431L programmed voltages range 1.24 with addition external resistors according following formula: VREF example given below properly select biasing resistor. Assuming: VMIN 4.5V VMAX 3.3V 10mA maximum value biasing resistor calculated using following equations: RB(MAX) VMIN IB(MAX) IL(MAX)
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)
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, VOUT
which will added 1.240V output voltage shown above equation. Since input bias current 0.5mA max, adds very small error output voltage most applications ignored. example, typical 3.3V application where R2=1.21KV R1=2KV error IADJ only which about 0.03% nominal point.
1.24 1.03mA
IRU431L
IB(MAX) 0.08 1.03 1.11mA RB(MAX) 108V 1.11
Select 100V 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. maximum power dissipation resistor calculated under maximum supply voltage follows: (MAX)
VKA)
Where: VMAX Maximum supply voltage (MAX) Maximum power dissipation
(MAX)
3.3) 73mW
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Rev. 08/05/03
IRU431L
Thermal Design IRU431L offered surface mount SOT-23 packages. SOT-23 package maximum power dissipation capability 150mW TA=25°C with derating factor -1.2mW table below summarizes maximum power dissipation capability each package versus ambient temperature. Ambient Temperature (TA)
132mW 120mW 108mW 96mW
SOT-23
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 0.01mF system will stable.
150mW
previous example, maximum power dissipation device calculated under load maximum input supply condition. maximum power calculated using following equation: PMAX
Where: PMAX Maximum power dissipation IRU431L example: PMAX (6100 89mW
shown power dissipation table, both packages handle this power dissipation.
Rev. 08/05/03
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IRU431L
TYPICAL APPLICATION
Figure cost 3.3V 2.7V output.
Desig
Description Shunt Regulator Capacitor Resistor Resistor Resistor Heat Sink
Part Manuf IRU431L Elect, 220mF, 6.3V, ECAOJFQ221 Panasonic 6.2KV, 118V, 100V, 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
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Rev. 08/05/03
IRU431L
(L3) SOT-23 Package 3-Pin
SYMBOL
0.890 1.120 0.013 0.100 0.370 0.510 0.085 0.180 2.800 3.040 1.200 1.400 0.890 1.030 1.780 2.050 2.100 2.640 0.55 0.450 0.600
NOTE: MEASUREMENTS MILLIMETERS.
Rev. 08/05/03
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IRU431L
(L5) SOT-23 Package 5-Pin
SYMBOL
0.90 1.45 0.00 0.15 0.90 1.30 0.25 0.50 0.09 0.20 2.80 3.00 2.60 3.00 1.50 1.75 0.95 1.90 0.35 0.55
NOTE: MEASUREMENTS MILLIMETERS.
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Rev. 08/05/03
IRU431L
PACKAGE SHIPMENT METHOD
DESIG SOT-23 SOT-23 PACKAGE DESCRIPTION COUNT PARTS TUBE -PARTS REEL 3000 3000 Orientation
Feed Direction Figure
Feed Direction Figure
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. 08/05/03
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IRU431L -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DESCRIPTION

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