SSPPXX11443311 PPrreecciissiioonn AAddjjuussttaabbllee SShhuunntt RReegguullaattoorr April 2013 Rev. 2.0.1 GENERAL DESCRIPTION APPLICATIONS The SPX1431 is a 3-terminal adjustable shunt Battery Operating Equipment voltage regulator providing a highly accurate Adjustable Supplies bandgap reference. The SPX1431 acts as an open-loop error amplifier with a 2.5V Switching Power Supplies temperature compensation reference. The Error Amplifiers SPX1431 s thermal stability, wide operating current (150mA) and temperature range Single Supply Amplifier (-55C to 125C) makes it suitable for a Monitors / VCRs / TVs variety of applications that require a low cost, Personal Computers high performance solution. SPX1431 tolerance of 0.4% is proven to be sufficient to overcome all of the other errors in the system to virtually FEATURES eliminate the need for trimming in the power supply manufacturer s assembly lines and Trimmed Bandgap Reference to 0.4% contributes a significant cost savings. Wide Operating Current 1mA to 150mA The output voltage may be adjusted to any -55C to 125C Extended Temperature value between VREF and 36 volts with two Range external resistors. The SPX1431 is available in SOIC-8 and SOT-89-3 packages. 30 ppm/C Low Temperature Coefficient Improved Replacement in Performance for LT1431 Low Cost Solution Offered in SOIC-8 and SOT-89 TYPICAL APPLICATION DIAGRAM Fig. 1: SPX1431 Block Diagram Exar Corporation www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 SSPPXX11443311 PPrreecciissiioonn AAddjjuussttaabbllee SShhuunntt RReegguullaattoorr ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of Cathode Voltage V .................................... VREF to 36V KA the device at these ratings or any other above those Cathode Current I ............................................... 10mA K indicated in the operation sections of the specifications Operating Junction Temperature T ............ -55C to 150C J below is not implied. Exposure to absolute maximum Thermal Resistance ...................................................... rating conditions for extended periods of time may affect (NSOIC8) ................................................175C/W JA reliability. (NSOIC8) ................................................. 45C/W JC Cathode-Anode Reverse Breakdown V .................... 37V KA (SOT89-3) ...............................................110C/W JA Anode-Cathode Forward Current, (<10ms) I ............. 1A AK (SOT89-3) .................................................. 8C/W JC ............................. 150mA Operating Cathode Current IKA Reference Input Current I .................................. 10mA REF Continuous Power Dissipation at 25C P ......................... D NSOIC-8 ....................................................... 750mW SOT-89-3 .................................................... 1000mW Junction Temperature T ....................................... 150C J Storage Temperature T ........................ -65C to 150C STG ESD Rating (HBM - Human Body Model) .................... 2kV ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of T = T = 25C only limits applying over the A J full Operating Junction Temperature range are denoted by a . Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T = T = 25C, and are A J provided for reference purposes only. Unless otherwise indicated, V = V , I = 10mAF, T = 25C. K REF K A Parameter Min. Typ. Max. Units Conditions 2.500 2.510 V Figure 5 2.490 Reference Voltage V REF 2.465 2.535 TJ= 0C to 105C, figure 5 V with Temperature TC 0.07 .20 mV/C Figure 5 REF Ratio of Change in V REF -2.0 -1.1 mV/V V = 3V to 36V, figure 6 K to Cathode Voltage V / V REF K Reference Input Current I 0.7 1.9 A Figure 6 REF I Temp Deviation I 0.4 1.2 A T = 0C to 105C, figure 6 REF REF J Min I for Regulation I 0.4 1 mA Figure 5 K K(MIN) Off State Leakage I 0.04 250 nA V = 0V, V = 36V, figure 7 K(OFF) REF KA Dynamic Output Impedance Z 0.15 0.5 1kHz, I = 1 to 150mA, figure 5 KA z K 2013 Exar Corporation 2/11 Rev. 2.0.1