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AQ431L
1.24V Shunt Ref/Amplifier
TO-92, SOT23, SC70 Package
Product Specification Revision 1.5 November 15, 2005
General Description
The AQ431L is a low voltage reference/ amplifier suited for the control loop of low voltage power supplies. Functionally similar to the ubiquitous TL431, the AQ431L has a lower 1.24V reference and a much wider range of operating currents. Particular care was taken in the design to minimize overshoot at startup and to allow wide AC bandwidth.
Applications * Power supply control loop * Low TC low voltage reference * Power management applications Features * * * *
Low voltage reference: 1.24V 40 uA to 100 mA operation Low TC voltage reference Improved AC, DC performance compared to TLV431, 432 part types * Offered in ultra small SC70 package * RoHS compliant
Pin Configuration
Pin Descriptions
Pin Name CATH REF ANODE Function Output and supply terminal, must be greater than 1.2V for normal operation Input, nominally 1.24V in normal operation. Ground and Substrate
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AQ431L
Acutechnology Semiconductor Inc.
AQ431L
Ordering Information
Device AQ431L AQ431L AQ431L AQ431L AQ431L Operating Tj -40C 105C -40C 105C -40C 105C -40C 105C -40C 105C %Tol 1.0 0.5 1.0 0.5 1.0 PKG Type TO-92-3 SOT-23-3 SOT-23-3 SOT-23-3 SC70-3 VOUT 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V Wrap T&R T&R T&R T&R T&R T&R Ordering Number AQ431LBY-N3-12-TRL AQ431LBZ-N3-12-TRL AQ431LBYM3-12-TRL AQ431LBZM3-12-TRL AQ431LBY-C3-12-TRL AQ431LBZ-C3-12-TRL
AQ431L -40C 105C 0.5 SC70-3 Note: The TRL 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 Value 18 3 150 150 260 -65 to +150 Units V mA mA C C C
Electrical Specifications
Electrical characteristics are guaranteed over the full temperature range -40C VREF VCATH
IREF IREF ICATH(min) ICATH(OFF) rCATH
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2
Rev. 1.5
November 15, 2005
Acutechnology Semiconductor Inc.
AQ431L
Typical Performance Characteristics
Reference voltage vs Junction temperature
1.246
Reference input current vs junction tem perature 250 Reference input current (nA) 240 230 220 210 200 190 180 170 160 150 -50 -25 0 25 50 75 100 125 150
1.244 Reference voltage (V) 1.242 1.24 1.238 1.236 1.234 1.232 -50 -25 0 25 50 75 100 125 150 Junction temperature (degrees C)
Junction tem perature (degrees C)
Cathode current vs Cathode voltage 150
Cathode current vs Cathode voltage 50 40 Cathode current (uA) 30 20 10 0 -10
100 Cathode current (mA)
50
0
-50
-100 -1 -0.5 0 0.5 1 1.5 Cathode voltage (V)
0
0.5
1
1.5
Cathode voltage (V)
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3
Rev. 1.5
November 15, 2005
Acutechnology Semiconductor Inc.
AQ431L
Typical Performance Characteristics (contd.)
Delta Reference voltage per delta cathode voltage vs junction temperature 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 -0.16 -0.18 -50 -25 0 25 50 75 100 125 150 Junction temperature (degrees C)
Off-state cathode current vs Junction temperature
80 Off-state cathode current (nA) 70 60 50 40 30 20 10 0 -50 -25 0 25 50 75 100 125 150 Junction temperature (degrees C)
Delta reference voltage per delta cathode voltage (mV/V)
Open lop voltage gain vs frequency
100 80 60 40 20 0 -20 0.001 100
Dynamic impedance vs frequency
Open loop voltage gain (dB)
Dynamic impedance (0hms)
10
1
0.1 0.01 0.1 1 10 100 1000 0.1 1 10 100 1000 10000 Frequency (KHz) Frequency (KHz)
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4
Rev. 1.5
November 15, 2005
Acutechnology Semiconductor Inc.
AQ431L
Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6
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5
Rev. 1.5
November 15, 2005
Acutechnology Semiconductor Inc.
AQ431L
Package Dimensions TO92-2, TO92-3
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6
Rev. 1.5
November 15, 2005
Acutechnology Semiconductor Inc.
AQ431L
Package Dimensions SC70-3, SC70-4, SC70-5, SC70-6
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.
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7
Rev. 1.5
November 15, 2005

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