IRU431LCS

Data Sheet No. PD94118 IRU431L LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DESCRIPTION FEATURES SOT-23 and SOIC Packages 1% Voltage Reference Initial Accuracy Low Operating Cathode Current (80µA max) Unconditionally Stable with only 1µF Adjustable Output from 1.24V to 15V 0.25Ω 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 80µA maximum quiescent current before regulating, making it ideal as a voltage reference for battery type applications. APPLICATIONS Precision Voltage Reference Linear Regulator Controller Secondary Side Controller for the Low Voltage Power Supply Applications TYPICAL APPLICATION VIN RB VOUT R1 IRU431L Vo = VREF ×o o1 + Co R2 R1 p R2 Figure 1 - Typical application of the IRU431L as a shunt regulator / voltage reference. PACKAGE ORDER INFORMATION TA (°C) 0 To 70 Rev. 1.7 01/22/02 5-PIN SOT-23 (L5) IRU431LCL5 3-PIN SOT-23 (L3) IRU431LCL3 www.irf.com 8-PIN PLASTIC SOIC (S) IRU431LCS 1 IRU431L ABSOLUTE MAXIMUM RATINGS Input Voltage (VIN) .................................................... Continuous Cathode Current Range .......................... Reference Current Range .......................................... Storage Temperature Range ...................................... Operating Junction Temperature Range ..................... 15V -15mA To +15mA -0.05mA To 1mA -65$C To 150$C 0$C To 150$C PACKAGE INFORMATION 5-PIN SOT-23 (L5) 3-PIN SOT-23 (L3) TOP VIEW TOP VIEW NC 1 5 Anode TOP VIEW 2 Cathode Anode 3 NC 2 Cathode 3 8-PIN PLASTIC SOIC (S) 1 Ref 4 Ref θJA=256°C/W Cathode 1 8 Ref NC 2 7 NC Anode 3 6 Anode NC 4 5 NC θJA=336°C/W θJA=160°C/W ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over TA=0 to 70$C, Co =1µF. Typical values refer to TA=25$C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. PARAMETER SYM Reference Voltage VREF VREF(DEV) VREF Deviation over full temperature range ∆VREF/∆VKA Ratio of VREF change to cathode voltage change Reference Pin Current IREF(DEV) IREF Deviation over full temperature range IK(MIN) Minimum Cathode Current Ioff Off State Cathode Current ZKA0 Dynamic Impedance TEST CONDITION IK=10mA, VKA=VREF, TA=25$C IK=10mA, VKA=VREF VKA=VREF, IK=10mA Note 1 IK=10mA, ∆VKA=VREF to 6V IK=10mA, R1=10KΩ, R2=open IK=10mA, R1=10KΩ, R2=open Note 1 VKA=VREF VKA=6V, VREF=0V VKA=10V, VREF=0V VKA=15V, VREF=0V VKA=VREF, f