IRU431LCL3

Data Sheet No. PD94118 IRU431L / IRU431AL LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DESCRIPTION The IRU431L family are three-terminal adjustable shunt regulators that can also be used as precision voltage references. 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 80m A maximum quiescent current before regulating, making it ideal as a voltage reference for battery type applications. The IRU431L has 61% initial accuracy while IRU431AL provides 60.5% initial accuracy. FEATURES SOT-23 Packages Voltage Reference Initial Accuracy (1% for IRU431L and 0.5% for IRU431AL) Low Operating Cathode Current (80m A max) Unconditionally Stable with only 1m F Adjustable Output from 1.24V to 15V 0.25V Typical Output Impedance Pin to Pin Compatible with TLV431 APPLICATIONS Precision Voltage Reference Linear Regulator Controller Secondary Side Controller for the low voltage power supply applications TYPICAL APPLICATION VIN RB R1 VOUT IRU431L Vo = VREF 3o 1 + R1 p R2 Co R2 Figure 1 - Typical application of the IRU431L as a shunt regulator / voltage reference. PACKAGE ORDER INFORMATION TA (°C) 0 To 70 0 To 70 5-PIN SOT-23 (L5) IRU431LCL5 IRU431ALCL5 3-PIN SOT-23 (L3) IRU431LCL3 IRU431ALCL3 Rev. 1.8 02/20/02 www.irf.com 1 IRU431L / IRU431AL 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 1mA -658C To 1508C 08C To 1508C PACKAGE INFORMATION 5-PIN SOT-23 (L5) TOP VIEW 3-PIN SOT-23 (L3) TOP VIEW 2 Cathode NC 1 NC 2 Cathode 3 5 Anode Anode 3 4 Ref 1 Ref θJA=256°C/W θJA=336°C/W ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over TA=0 to 708C, Co = 1m F. 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 TEST CONDITION IK=10mA, V KA=VREF, TA=258C IK=10mA, VKA=VREF IK=10mA, V KA=VREF, TA=258C IK=10mA, VKA=VREF VKA=VREF, IK=10mA Note 1 IK=10mA, D VKA=VREF to 6V IK=10mA, R1=10K V, R2=open IK=10mA, R1=10K V, R2=open Note 1 VKA=VREF VKA=6V, VREF=0V VKA=10V, VREF=0V VKA=15V, VREF=0V VKA=VREF, f