AQ431R 2.5V Shunt Ref/Amplifier TO-92 and SOT23 Package Preliminary Specification Revision 1.6 June 15, 2007 General Description Applications 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. • Power supply control loop • Low TC voltage reference • Power management applications 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. • Programmable precise output voltage Features • • • • • 2.5V to 15V Wide temp range: -40º to 85ºC 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 www.acutechnology.com Function Output and supply terminal, must be greater than 2.5V for normal operation Input, nominally 2.495V in normal operation. Ground and Substrate AQ431R AQ431R Acutechnology Semiconductor Inc. Ordering Information Device Operating Tj %Tol AQ431R -40C˚ ≤ 85C˚ 1.5 AQ431R -40C˚ ≤ 85C˚ 1.5 VOUT Wrap Ordering Number TO-92-3 2.5V BULK AQ431REX-N3-25-BUL TO-92-3 2.5V T&R AQ431REX-N3-25-TRL 2.5V T&R AQ431REX-M3-25-TRL PKG Type 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 Value Units CATH Voltage 18 V REF Current 10 mA CATH, ANODE Currents 100 mA Operating Junction Temperature 150 ºC Lead Temperature (soldering 10 seconds) 260 ºC -65 to +150 ºC 3 KV Storage Temperature Range ESD Rating (HBM) Electrical Specifications Electrical characteristics are guaranteed over the full temperature range –40ºC <Tj<85ºC unless otherwise stated. Ambient temperature must be de-rated based upon power dissipation and package thermal characteristics. Symbol VREF ∆VREF ∆VREF ∆VCATH IREF Parameter Conditions Min Typ Max Units Reference Voltage VREF Temperature deviation 25ºC; VREF=VCATH; ICATH =10mA –40ºC <Tj<85ºC. 2.458 2.495 8 2.532 25 V mV Ratio of VREF Change to VCATH Change (Line Reg; 1/gain) ICATH=10mA, VCATH = VREF to 15V -1 -2.7 mV/V Reference input current ICATH=10mA 0.7 4 µA ∆IREF IREF Temperature Deviation 0.04 0.2 µA ICATH(min) Minimum Cathode Current .5 1 mA ICATH(OFF) Off-State Cathode Current VREF=0V; VCATH=15V .05 1 µA Dynamic Output Impedance ICATH=0.1 to 100mA f ≤ 1.0 kHz 0.2 0.5 Ω rCATH www.acutechnology.com 2 Rev. 1.6 June 15, 2007 AQ431R Acutechnology Semiconductor Inc. Typical Performance Characteristics Reference voltage vs Junction temperature Reference input current vs junction temperature 800 Reference input current (nA) Reference voltage (V) 2.505 2.5 2.495 2.49 2.485 2.48 700 600 500 400 300 200 -50 -25 0 25 50 75 100 125 150 -50 -25 Junction temperature (degrees C) 0 25 50 75 100 125 150 Junction temperature (degrees C) Cathode current vs Cathode voltage 60 Cathode current (mA) 40 20 0 -20 -40 -60 -80 -100 -1 0 1 2 3 Cathode voltage (V) Typical Performance Characteristics (contd.) www.acutechnology.com 3 Rev. 1.6 June 15, 2007 AQ431R Acutechnology Semiconductor Inc. Off-state cathode current vs Junction temperature Delta Reference voltage per delta cathode voltage vs junction temperature -0.5 Delta reference voltage per delta cathode voltage (mV/V) Off-state cathode current (nA) 60 50 40 30 20 10 0 -0.6 -0.7 -0.8 -0.9 -1 -1.1 -1.2 -1.3 -50 -25 0 25 50 75 100 125 150 -50 -25 Junction temperature (degrees C) 0 25 50 75 100 125 150 Junction temperature (degrees C) Dynamic impedance vs frequency Open loop voltage gain vs frequency 10 70 Dynamic impedance (0hms) Open loop voltage gain (dB) 60 50 40 30 20 10 1 0 -10 0.1 0.1 1 10 100 1000 10000 0.1 Frequency (KHz) www.acutechnology.com 1 10 100 1000 10000 Frequency (KHz) 4 Rev. 1.6 June 15, 2007 AQ431R Acutechnology Semiconductor Inc. Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6 www.acutechnology.com 5 Rev. 1.6 June 15, 2007 AQ431R Acutechnology Semiconductor Inc. Package Dimensions TO92-2, TO92-3 Contact Information Acutechnology Semiconductor Inc. 3487 McKee Rd. Suite 52 San Jose CA , USA 95127 TEL: (408) 259-2300 FAX: (408) 259-9160 website: www.acutechnology.com 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. 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