SPX1431S-L

SPX1431 Precision Adjustable Shunt Regulator April 2013 Rev. 2.0.1 GENERAL DESCRIPTION APPLICATIONS The SPX1431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX1431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX1431's thermal stability, wide operating current (150mA) and temperature range (-55°C to 125°C) makes it suitable for a variety of applications that require a low cost, 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 eliminate the need for trimming in the power supply manufacturer's assembly lines and contributes a significant cost savings. The output voltage may be adjusted to any value between VREF and 36 volts with two external resistors. The SPX1431 is available in SOIC-8 and SOT-89-3 packages. • Battery Operating Equipment • Adjustable Supplies • Switching Power Supplies • Error Amplifiers • Single Supply Amplifier • Monitors / VCRs / TVs • Personal Computers FEATURES • Trimmed Bandgap Reference to 0.4% • Wide Operating Current 1mA to 150mA • -55°C to 125°C Extended Temperature Range • 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 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 – Fax. +1 510 668-7001 SPX1431 Precision Adjustable Shunt Regulator ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Cathode Voltage VKA .................................... VREF to 36V Cathode Current IK ............................................... 10mA Operating Junction Temperature TJ............-55°C to 150°C Thermal Resistance ...................................................... θJA (NSOIC8) ................................................175°C/W θJC (NSOIC8) ................................................. 45°C/W θJA (SOT89-3)...............................................110°C/W θJC (SOT89-3).................................................. 8°C/W Cathode-Anode Reverse Breakdown VKA .................... 37V Anode-Cathode Forward Current, (VREF 4/11 Fig. 7: Test Circuit for IKOFF Rev. 2.0.1 SPX1431 Precision Adjustable Shunt Regulator TYPICAL PERFORMANCE CHARACTERISTICS All data taken at Unless otherwise indicated, VK = VREF, IK = 10mAµF, TA= 25°C. Fig. 8: High Current Operating Characteristics Fig. 9: Reference Voltage vs. Ambient Temperature Fig. 10: Low Current Operating Characteristics Fig. 11: Reference Input Current vs. Ambient Temperature Fig. 12: Reference Voltage Line Regulation vs. Fig. 13: Noise Voltage vs. Frequency Cathode Voltage and TAMBIENT © 2013 Exar Corporation 5/11 Rev. 2.0.1 SPX1431 Precision Adjustable Shunt Regulator Fig. 14: Low Frequency Dynamic Output Impedance vs. TAMBIENT Fig. 15: Small Signal Gain and Phase vs. Frequency; Fig. 16: Test Circuit for Gain and Phase Frequency Response Fig. 17: Frequency = 100kHz IK = 10mA, TA= 25°C Fig. 18: Test Circuit for Pulse Response Fig. 19: Stability Boundary Conditions © 2013 Exar Corporation IK= 10mA, TA= 25°C 6/11 Rev. 2.0.1 SPX1431 Precision Adjustable Shunt Regulator Fig. 20: Test Circuit for Stability Fig. 21: Dynamic Output Impedance TA= 25°C, IK= 1 to 100mA Fig. 22: Off State Leakage Fig. 23: Shunt Regulator VOUT = (1+R1/R2).VREF Fig. 24: Constant Current, Sink, ISINK= VREF/R1 Fig. 25: Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters © 2013 Exar Corporation 7/11 Rev. 2.0.1 SPX1431 Precision Adjustable Shunt Regulator Fig. 26: Precision High Current Series Regulator Fig. 27: High Current Shunt Regulator VOUT= (1+R1/R2)VREF VOUT= (1+R1/R2)VREF Fig. 28: Single Supply Comparator with Temperature Compensated Threshold. VIN threshold = 2.5V Resistor values are chosen such that the effect to IREF is negligible. © 2013 Exar Corporation 8/11 Rev. 2.0.1 SPX1431 Precision Adjustable Shunt Regulator PACKAGE SPECIFICATION SOT-89-3 © 2013 Exar Corporation 9/11 Rev. 2.0.1 SPX1431 Precision Adjustable Shunt Regulator NSOIC-8 © 2013 Exar Corporation 10/11 Rev. 2.0.1 SPX1431 Precision Adjustable Shunt Regulator REVISION HISTORY Revision Date Description 2.0.0 04/26/2013 Reformat of Datasheet Update of SOT89-3 package specification Added ESD rating in Absolute Maximum Ratings 2.0.1 07/19/2013 Updated Top Mark information and provided clarifying information FOR FURTHER ASSISTANCE Email: customersupport@exar.com powertechsupport@exar.com Exar Technical Documentation: http://www.exar.com/TechDoc/default.aspx? EXAR CORPORATION HEADQUARTERS AND SALES OFFICES 48720 Kato Road Fremont, CA 94538 – USA Tel.: +1 (510) 668-7000 Fax: +1 (510) 668-7030 www.exar.com NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. or its in all Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. © 2013 Exar Corporation 11/11 Rev. 2.0.1