Programmable Shunt Regulator Programmable Output Voltage Volts Dy

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Programmable Shunt Regulator Programmable Output Voltage Volts Dy

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LM431SA/LM431SB/LM431SC
Programmable Shunt Regulator
Programmable Output Voltage Volts Dynamic Output Impedance 0.20 Typical Sink Current Capability 100mA Equivalent Full-Range Temperature Coefficient 50ppm/°C Typical Temperature Compensated Operation Over Full Rated Operating Temperature Range Output Noise Voltage Fast Turn-on Response
Description
LM431SA/LM431SB/LM431SC three terminal output adjustable regulators with thermal stability over operating temperature range. output voltage value between VREF (approximately volts) volts with external resistors. These devices have typical dynamic output impedance Active output circuit provides sharp turn-on characteristic, making these devices excellent replacement Zener Diodes many applications.
SOT-89
Anode Cathode SOT-23F
Cathode Anode
Internal Block Diagram
Rev. 1.0.4
©2003 Fairchild Semiconductor Corporation
LM431SA/LM431SB/LM431SC
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.) Parameter Cathode Voltage Cathode current Range (Continuous) Reference Input Current Range Thermal Resistance Junction-Air (Note1,2) Suffix Package Suffix Package Power Dissipation (Note3,4) Suffix Package Suffix Package Junction Temperature Operating Temperature Range Storage Temperature Range
Note: Thermal resistance test board
Symbol IREF
Value -100 +150 -0.05 +150
Unit °C/W
TOPR TSTG
Size: 76.2mm 114.3mm 1.6mm (1S0P) JEDEC Standard: JESD51-3, JESD51-7
Assume ambient airflow. TJMAX 150°C, Ratings apply ambient temperature 25°C Power dissipation calculation: TA)/RJA
Recommended Operating Conditions
Parameter Cathode Voltage Cathode Current Symbol Min. VREF Typ. Max. Unit
LM431SA/LM431SB/LM431SC
Electrical Characteristics
+25°C, unless otherwise specified) Parameter
Reference Input Voltage Deviation Reference Input Voltage OverTemperature Ratio Change Reference Input Voltage Change Cathode Voltage Reference Input Current Deviation Reference Input Current Over Full Temperature Range Minimum Cathode Current Regulation -Stage Cathode Current Dynamic Impedance
Symbol
VREF
Conditions
VKA=VREF, IKA=10mA
LM431SA
LM431SB
LM431SC
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
Unit
VREF/
VKA=VREF, IKA=10mA TMINTATMAX
VREF/
=10mA
VKA=10VVREF
-1.0
-2.7
-1.0
-2.7
-1.0
-2.7 mV/V
VKA=36V10V
IREF IKA=10mA, R1=10K,R2=
-0.5
-2.0
-0.5
-2.0
-0.5
-2.0
IKA=10mA, R1=10K,R2= IREF/T =Full Range
IKA(MIN)
VKA=VREF
0.45
0.45
0.45
IKA(OFF)
VKA=36V, VREF=0 VKA=VREF, IKA=1 100mA 1.0kHz
0.05
0.05
0.05
0.15
0.15
0.15
Note1 TMIN -25°C, TMAX +85°C
LM431SA/LM431SB/LM431SC
Test Circuits
LM431S LM431S
Figure Test Circuit VKA=VREF
Figure Test Circuit VKAVREF
LM431S
Figure Test Circuit lKA(OFF)
LM431SA/LM431SB/LM431SC
Typical Performance Characteristics
VREF
VREF
IKA, CATHODE CURRENT (uA)
Cathode Current (mA)
IKA(MIN)
-100
VKA, Cathode Voltage
-200
VKA, CATHODE VOLTAGE
Figure Cathode Current Cathode Voltage
Figure Cathode Current Cathode Voltage
0.100
Ioff, Off-State Cathode Current (uA)
0.075
Iref, Reference Input Current (uA)
0.050
0.025
0.000
Ambient Temperature
Ambient Temperature
Figure OFF-State Cathode Current Ambient Temperature
Figure7. Reference Input Current Ambient Temperature
10mA
TA=25
INPUT
Open Loop Voltage Gain (dB)
Voltage Swing
OUTPUT
100k
Frequency (Hz)
Time (us)
Figure Small Signal Voltage Amplification Frequency
Figure Pulse Response
LM431SA/LM431SB/LM431SC
Typical Performance Characteristics (Continued)
Vref 10mA
CATHODE CURRENT(mA)
Current(mA)
100n
100p
LOAD CAPACITANCE
Anode-Ref. Voltage(V)
Figure Stability Boundary Conditions
Figure Anode-Reference Diode Curve
Current(mA)
Ref.-Cathode Voltage(V)
Figure Reference-Cathode Diode Curve
LM431SA/LM431SB/LM431SC
Typical Application
LM7805/MC7805
LM431S
LM431S
LM431S
Figure Shunt Regulator
Figure Output Control Figure High Current Shunt Regulator Three-Termianl Fixed Regulator
LM431S
LM431S
Figure Current Limit Current Source
Figure Constant-Current Sink
LM431SA/LM431SB/LM431SC
Mechanical Dimensions
Package Dimensions millimeters
SOT-23F
Marking
tolerance
tolerance
0.5% tolerance
LM431SA/LM431SB/LM431SC
Mechanical Dimensions (Continued)
Package Dimensions millimeters
SOT-89
4.50 ±0.20 1.65 ±0.10 C0.2
(0.50)
1.50 ±0.20 (0.40)
2.50 ±0.20
0.50 ±0.10 1.50 1.50
0.40 ±0.10 0.40
+0.10 -0.05
Marking
(1.10)
4.10 ±0.20
tolerance
tolerance
0.5% tolerance
LM431SA/LM431SB/LM431SC
Ordering Information
Product Number LM431SCCML LM431SCCMF LM431SBCML LM431SBCMF LM431SACML LM431SACMF Output Voltage Tolerance 0.5% Package SOT-89 SOT-23F SOT-89 SOT-23F SOT-89 SOT-23F +85°C Operating Temperature
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES RIGHT MAKE CHANGES WITHOUT FURTHER NOTICE PRODUCTS HEREIN IMPROVE RELIABILITY, FUNCTION DESIGN. FAIRCHILD DOES ASSUME LIABILITY ARISING APPLICATION PRODUCT CIRCUIT DESCRIBED HEREIN; NEITHER DOES CONVEY LICENSE UNDER PATENT RIGHTS, RIGHTS OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT FAIRCHILD SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
www.fairchildsemi.com 8/4/03 0.0m Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.

Programmable Shunt Regulator Programmable Output Voltage Volts Dy

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