LM431BQ
Precision Programmable Reference
SG Micro Corp
www.sg-micro.com
MARCH 2022 – REV. A
GENERAL DESCRIPTION
The LM431BQ is a precision programmable shunt
voltage reference that can be used in automotive
applications. It is a three-terminal adjustable-output
device that can keep stable under all capacitive loads.
It requires two external resistors to set the output
voltage from V
REF
to 36V.
The LM431BQ features low dynamic impedance, low
noise, and low temperature coefficient to ensure a
stable output voltage over a wide range of operating
temperatures and currents. These high performances
make it very suitable for multiple applications, such as
precision audio components and flyback switching
power supplies.
This device is AEC-Q100 qualified (Automotive
Electronics Council (AEC) standard Q100 Grade 1) and
it is suitable for automotive applications.
The LM431BQ is available in a Green SOT-23 package.
FEATURES
● AEC-Q100 Qualified for Automotive Applications
Device Temperature Grade 1
T
A
= -40℃ to +125℃
● Adjustable Output Voltage: V
REF
to 36V
● Sink-Current Capability: 1mA to 100mA
● ▲Reference Voltage Tolerance at +25
℃: 0.5%
● Temperature Drift: 5mV (TYP)
● Output Impedance: 0.1Ω (TYP)
● ▲High Stability under Capacitive Load
● Low Output Noise
● Operating Junction Temperature Range:
-40
℃ to +125℃
● Available in a Green SOT-23 Package
APPLICATIONS
AEC-Q100 Grade 1 Applications
Portable, Battery-Powered Equipment
Voltage Monitoring
Flyback Switching Power Supplies
Instrumentation
Product Testing
Precision Audio Components
TYPICAL APPLICATION
V
KA
I
KA
V
REF
Input
Figure 1. Typical Application Circuit
LM431BQ Precision Programmable Reference
2
MARCH 2022
SG Micro Corp
www.sg-micro.com
PACKAGE/ORDERING INFORMATION
MODEL
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
LM431BQ SOT-23 -40℃ to +125℃ LM431BQN3LG/TR SYLXX Tape and Reel, 3000
MARKING INFORMATION
NOTE: XX = Date Code.
Date Code
-
Year
Date Code - Week
Serial Number
YYY X X
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS
Cathode Voltage
(1)
, V
KA
................................................... 40V
Continuous Cathode Current Range, I
KA
... -100mA to 150mA
Reference Input Current Range, I
I(REF)
....... -0.05mA to 10mA
Package Thermal Resistance
SOT-23, θ
JA
.............................................................. 245℃/W
Junction Temperature ................................................. +150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering, 10s)............................. +260℃
ESD Susceptibility
HBM ............................................................................. 4000V
CDM ............................................................................ 1000V
RECOMMENDED OPERATING CONDITIONS
Cathode Voltage, V
KA
.......................................... V
REF
to 36V
Cathode Current, I
KA
....................................... 1mA to 100mA
Operating Junction Temperature Range ...... -40℃ to +125℃
NOTE:
1. All voltage values are with respect to ANODE, unless
otherwise noted.
OVERSTRESS CAUTION
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure
to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section
is not implied.
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failure
to observe proper handling
and installation procedures
can cause damage. ESD damage can range from subtle
performance
degradation to
complete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit
design, or specifications
without prior notice.