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
V
OUT
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
ºC
ºC
ºC
Electrical Specifications
Electrical characteristics are guaranteed over the full temperature range –40ºC <Tj<105ºC unless otherwise
stated. Ambient temperature must be de-rated based upon power dissipation and package thermal
characteristics.
Symbol
V
REF
∆V
REF
Parameter
Reference Voltage
V
REF
Temperature deviation
Ratio of V
REF
Change to V
CATH
Change (Line Reg; 1/gain)
Reference input current
I
REF
Temperature Deviation
Minimum Cathode Current
Off-State Cathode Current
Dynamic Output Impedance
V
REF
=0V; V
CATH
=16V
I
CATH
=0.1 to 100mAf
≤
1.0 kHz
0.3
Conditions
25ºC;
V
REF
=V
CATH
;
I
CATH
=10mA
–40ºC <Tj<105ºC.
I
CATH
=10mA,
V
CATH
= V
REF
to 6V
I
CATH
=10mA
0.5% option
1.0% option
Min
1.234
1.228
Typ
1.240
1.240
4
0.3
0.2
0.04
18
Max
1.246
1.252
12
1
0.4
0.2
40
100
0.4
Units
V
V
mV
mV/V
µA
µA
µA
nA
Ω
∆
V
REF
∆
V
CATH
I
REF
∆I
REF
I
CATH(min)
I
CATH(OFF)
r
CATH
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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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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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Rev. 1.5
November 15, 2005
Acutechnology Semiconductor Inc.
AQ431L
Package Dimensions
SOT23-3, SOT23-4, SOT23-5, SOT23-6
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Rev. 1.5
November 15, 2005
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