AMS3431 PRECISION ADJUSTABLE SHUNT REGULATOR APPLICATIONS
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Trimmed 0.25% Reference Wide Operating Current Range 250µA 150mA Dynamic Output Impedance Output Noise Nominal Temperature Range 85°C Temperature-Compensated: 60ppm/°C Internal Amplifier with 150mA Capability
AMS3431
PRECISION ADJUSTABLE SHUNT REGULATOR
APPLICATIONS
Battery Powered Systems Switching Power Supplies Adjustable Power Supplies Linear Regulators Error Amplifiers Notebook/Personal Computer Monitors/ VCR/ Pagers
GENERAL DESCRIPTION
AMS3431 three-terminal adjustable shunt regulator with guaranteed temperature stability over entire range operation. output voltage value between 2.5V (VREF) adding external resistors. sharp turn-on characteristics this device excellent replacement zener diodes many applications. AMS3431 available space saving SOT-23 package TO-92 package.
ORDERING INFORMATION:
TOL. ±0.25% ±0.5% ±1.0% PACKAGE TYPE TO-92 AMS3431AN AMS3431BN AMS3431CN LEAD SOT-23 AMS3431AM AMS3431BM AMS3431CM OPERATING TEMPERATURE RANGE +85° +85° +85°
CONNECTIONS
TO-92 Plastic Package SOT-23
ANODE
CATHODE ANODE
CATHODE
Bottom View
View
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS3431
ABSOLUTE MAXIMUM RATINGS (Note
Cathode Voltage (VZ) Continuous Cathode Current (IZ) Reference Input Current (IREF) Junction Temperature (TJ) Storage Temperature Lead Temperature (Soldering, 10sec.) -10mA +150mA 10mA -40°C +125°C -65°C +150°C 265°C Internal Power Dissipation (PD) TO-92 Package SOT-23 Package Thermal Resistance (JA) TO-92 Package SOT-23 Package 0.78W 0.28W 160°C/W 410°C/W
Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device intended functional, guarantee specific performance limits. guaranteed specifications test conditions, Electrical Characteristics. guaranteed specifications apply only test conditions listed.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics +25°C unless otherwise specified. Parameter
Reference Voltage Deviation Reference Input Voltage over Temperature Ratio Change Reference Voltage Cathode Voltage Reference Input Current Reference Input Current Deviation over Temperature State Cathode Current Dynamic Output Impedance Minimum Operating Current VREF (circuit +25°C +85°C -40°C +25°C from VREF from VREF =10k, (test circuit =10k, Full Range (test circuit 36V, VREF test circuit 1KHz, VREF =100µA 100mA (test circuit VREF (test circuit
Conditions
2.489
AMS3431A
2.495 -0.5 -1.0 2.501 -2.7 -2.0
2.483
AMS3431B
2.495 -0.5 -1.0 2.507 -2.7 -2.0
2.470
AMS3431C
2.495 -0.5 -1.0 2.520 -2.7 -2.0
Units
mV/V mV/V
0.04 0.25
0.04 0.25
0.04 0.25
RECOMMENDED OPERATING CONDITIONS:
VREF 0.25mA 120mA
Cathode Voltage, (VZ) Cathode Current, (IZ)
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS3431
TEST CIRCUITS
VREF
IREF VREF
IREF
VREF
Figure Test Circuit VZ=VREF
Figure Test Circuit VREF Test circuit IREF.
Figure Test Circuit Off-State Current
TYPICAL APPLICATIONS
Single Supply Comparator with Temperature Compensated Threshold
VREF 2.5V
Shunt Regulator
VOFF
(1+R1/R2)VREF
Series Regulator
Higher Current Shunt Regulator
0.01µF
(1+R1/R2)VREF
(1+R1/R2)VREF
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS3431
TYPICAL APPLICATIONS (Continued)
Over Voltage/Under Voltage Protection Circuit
WHEN HIGH LIMIT LIMIT
Voltage Monitor
LIMIT VREF( 1+R1B/R2B)+VBE LIMIT VREF( 1+R1A/R2A)
LIMIT VREF( 1+R1B/R2B)+VBE LIMIT VREF( 1+R1A/R2A)
WHEN LIMIT HIGH LIMIT
Delay Timer
Current Limiter Current Source
DELAY R*C*ln*V+/(V+)-VREF
=VREF/RCL
Constant Current Sink
VREF/RS
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS3431
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current
25°C
Thermal Information 1000 REFERENCE VOLTAGE INPUTT CURRENT (mA)
Input Current
25°C
INPUTT CURRENT (µA)
CATHODE VOLTAGE
TO-92
SOT-23
TEMPERATURE CATHODE VOLTAGE
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
TO-92 PLASTIC PACKAGE
0.060±0.005 (1.524±0.127)
0.180±0.005 (4.572±0.127) 0.060±0.010 (1.524±0.254) 0.140±0.010 (3.556±0.127)
0.180±0.005 (4.572±0.127)
0.90 (2.286)
0.500 (12.70)
0.050 (1.270)
UNCONTROLLED LEAD DIMENSIONS
0.050±0.005 (1.270±0.127)
0.016±0.003 (0.406±0.076)
0.015±0.002 (0.381±0.051)
(TO-92 DRW# 042391
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS3431
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
LEAD SOT-23 PLASTIC PACKAGE
0.110-0.120 (2.794-3.048) 0.015-0.017 (0.381-0.432)
0.083-0.098 (2.108-2.489) 0.047-0.055 (1.194-1.397)
0.035-0.040 (0.889-1.016)
0.018-0.024 (0.457-0.610)
0.035-0.041 (0.089-1.041) 0.0034-0.0050 (0.086-0.127) 0.0005-0.0040 (0.013-0.102) 0.070-0.080 (1.778-2.032) 0.018-0.024 (0.457-0.610)
(SOT-23 DRW# 051991
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
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