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| AQ431R 2.5V Shunt Ref/Amplifier TO-92 and SOT23 Package Preliminary Specification Revision 1.6 June 15, 2007 General Description The AQ431R is a three-terminal adjustable shunt regulator based on a highly stable bandgap reference and is an excellent replacement for standard TL431 references when used as a secondary feedback element in Switch Mode Power Supplies. The AQ431R meets all of the requirements of the standard 431 specifications that are needed to monitor the secondary output voltage and provide the feedback signal to the primary through an opto-coupler. It is offered in both the very popular SOT23-3 and TO-92 packages. Applications * Power supply control loop * Low TC voltage reference * Power management applications Features * Programmable precise output voltage * * * * * 2.5V to 15V Wide temp range: -40 to 85C standard Improved stability with capacitive loads Low TC voltage reference Wide range of package options RoHS compliant Pin Configuration Pin Descriptions Pin Name CATH REF ANODE Function Output and supply terminal, must be greater than 2.5V for normal operation Input, nominally 2.495V in normal operation. Ground and Substrate www.acutechnology.com AQ431R Acutechnology Semiconductor Inc. AQ431R Ordering Information Device AQ431R AQ431R Operating Tj -40C 85C -40C 85C %Tol 1.5 1.5 PKG Type TO-92-3 TO-92-3 VOUT 2.5V 2.5V 2.5V Wrap BULK T&R T&R Ordering Number AQ431REX-N3-25-BUL AQ431REX-N3-25-TRL AQ431REX-M3-25-TRL AQ431R -40C 85C 1.5 SOT-23-3 Note: All parts are Lead Free and RoHS compliant. Absolute Maximum Ratings Stress greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These stress ratings only, and functional operation of the device at these or any conditions beyond those indicated under recommended Operating Conditions is not implied. Exposure to "Absolute Maximum Rating" for extended periods may affect device reliability. Use of standard ESD handling precautions is required. Parameter CATH Voltage REF Current CATH, ANODE Currents Operating Junction Temperature Lead Temperature (soldering 10 seconds) Storage Temperature Range ESD Rating (HBM) Value 18 10 100 150 260 -65 to +150 3 Units V mA mA C C C KV Electrical Specifications Electrical characteristics are guaranteed over the full temperature range -40C IREF IREF ICATH(min) ICATH(OFF) rCATH www.acutechnology.com 2 Rev. 1.6 June 15, 2007 Acutechnology Semiconductor Inc. AQ431R Typical Performance Characteristics Reference voltage vs Junction temperature 2.505 Reference input current (nA) 800 700 600 500 400 300 200 Reference input current vs junction temperature Reference voltage (V) 2.5 2.495 2.49 2.485 2.48 -50 -25 0 25 50 75 100 125 150 Junction temperature (degrees C) -50 -25 0 25 50 75 100 125 150 Junction temperature (degrees C) Cathode current vs Cathode voltage 60 40 20 0 -20 -40 -60 -80 -100 -1 0 1 Cathode voltage (V) 2 3 Typical Performance Characteristics (contd.) www.acutechnology.com Cathode current (mA) 3 Rev. 1.6 June 15, 2007 Acutechnology Semiconductor Inc. Off-state cathode current vs Junction temperature 60 Delta reference voltage per delta cathode voltage (mV/V) Off-state cathode current (nA) 50 40 30 20 10 0 -50 -25 0 25 50 75 100 125 150 Junction temperature (degrees C) AQ431R Delta Reference voltage per delta cathode voltage vs junction temperature -0.5 -0.6 -0.7 -0.8 -0.9 -1 -1.1 -1.2 -1.3 -50 -25 0 25 50 75 100 125 150 Junction temperature (degrees C) Open loop voltage gain vs frequency 70 60 Open loop voltage gain (dB) 50 40 30 20 10 0 -10 0.1 1 10 100 1000 10000 Frequency (KHz) 0.1 0.1 Dynamic impedance (0hms) Dynamic impedance vs frequency 10 1 1 10 100 1000 10000 Frequency (KHz) www.acutechnology.com 4 Rev. 1.6 June 15, 2007 Acutechnology Semiconductor Inc. AQ431R Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6 www.acutechnology.com 5 Rev. 1.6 June 15, 2007 Acutechnology Semiconductor Inc. AQ431R Package Dimensions TO92-2, TO92-3 Contact Information Acutechnology Semiconductor Inc. 3487 McKee Rd. Suite 52 San Jose CA , USA 95127 Disclaimer The information furnished by Acutechnology in this data sheet is believed to be accurate and reliable. However, Acutechnology assumes no responsibility for its use. Acutechnology reserves the right to change circuitry and specifications at any time without notification to the customer. TEL: (408) 259-2300 FAX: (408) 259-9160 website: www.acutechnology.com Life Support Policy Acutechnology Products are not designed or authorized for use as components in life support devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. www.acutechnology.com 6 Rev. 1.6 June 15, 2007 |
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