IRU431-L3TR

Data Sheet No. PD94118 IRU431L LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DESCRIPTION FEATURES SOT-23 Packages Voltage Reference Initial Accuracy (1%) Low Operating Cathode Current (80mA max) Unconditionally Stable with only 1mF Adjustable Output from 1.24V to 15V 0.25V Typical Output Impedance Pin to Pin Compatible with TLV431 The IRU431L is a three-terminal adjustable shunt regulator that can also be used as a precision voltage reference. Its output voltage may be set to any value between VREF(1.24V) and 15V with two external resistors as shown in the typical application circuit. Other applications of this device include being used as a merged amplifier and reference in applications such as a linear regulator or as the secondary side controller in low voltage power supply applications. The IRU431L only requires 80mA maximum quiescent current before regulating, making it ideal as an efficient voltage reference for battery type applications. The IRU431L has 61% initial accuracy. APPLICATIONS Precision Voltage Reference Linear Regulator Controller Secondary Side Controller for the low voltage power supply applications TYPICAL APPLICATION RB VIN VOUT K (Cathode) IRU431L Ref VREF A (Anode) ( Vo = VREF 3 1 + R1 R2 R1 ) CO R2 Figure 1 - Typical application of the IRU431L as a shunt regulator / voltage reference. PACKAGE ORDER INFORMATION TA (°C) 0 To 70 Rev. 2.0 08/05/03 3-PIN SOT-23 (L3) IRU431LCL3 www.irf.com 5-PIN SOT-23 (L5) IRU431LCL5 1 IRU431L ABSOLUTE MAXIMUM RATINGS Input Voltage (V IN) .................................................... Continuous Cathode Current Range .......................... Reference Current Range .......................................... Storage Temperature Range ...................................... Operating Junction Temperature Range ..................... 15V -15mA to +15mA -0.05mA to 15mA -658C to 1508C 08C to 1508C 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) TOP VIEW TOP VIEW 2 Cathode Anode 3 NC 1 5 Anode 4 Ref NC 2 1 Ref Cathode 3 θJA=336°C/W θJA=256°C/W ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over TA=0 to 708C, Co =1mF. Typical values refer to TA=258C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. PARAMETER SYM Reference Voltage VREF IRU431L VREF(DEV) VREF Deviation over full temperature range Ratio of VREF change to DVREF/DVKA cathode voltage change Reference Pin Current IREF Deviation over full IREF(DEV) temperature range Minimum Cathode Current IK(MIN) Off State Cathode Current Ioff Dynamic Impedance ZKA0 TEST CONDITION MIN TYP MAX UNITS 1.228 1.221 1.240 1.240 6 1.252 1.259 -1 -6 mV/V IK=10mA, R1=10KV, R2=open IK=10mA, R1=10KV, R2=open 0.15 0.05 1 mA mA VKA=VREF VKA=6V, VREF=0V VKA=10V, VREF=0V VKA=15V, VREF=0V VKA=VREF, f