Advanced Monolithic Systems AMS431 PRECISION ADJUSTABLE SHUNT REGULATOR FEATURES APPLICATIONS • Trimmed 0.25% Reference • Wide Operating Current Range 250µ µ A to 150mA • Low Dynamic Output Impedance • Low Output Noise • Nominal Temperature Range to 85°°C • Temperature-Compensated: 60ppm/°°C • Internal Amplifier with 150mA Capability • Battery Powered Systems • Switching Power Supplies • Adjustable Power Supplies • Linear Regulators • Error Amplifiers • Notebook/Personal Computer • Monitors/ VCR/ TV • Pagers GENERAL DESCRIPTION The AMS431 is a three-terminal adjustable shunt regulator with guaranteed temperature stability over the entire range of operation. The output voltage can be set to any value between 2.5V (VREF) and 36V by adding two external resistors. Due to the sharp turn-on characteristics this device is an excellent replacement for zener diodes in many applications. AMS431 is available in TO-92, SO-8, SOT-89 and SOT-23 packages. ORDERING INFORMATION: TOL. PACKAGE TYPE TO-92 AMS431AN AMS431BN AMS431CN ±0.25% ±0.5% ±1.0% 8 LEAD SOIC AMS431AS AMS431BS AMS431CS OPERATING SOT-89 AMS431AL AMS431BL AMS431CL 3 LEAD SOT-23 AMS431AM AMS431BM AMS431CM TEMP. RANGE -40 to +85° C -40 to +85° C -40 to +85° C PIN CONNECTIONS TO-92 Plastic Package (N) 8L SOIC SO Package (S) SOT-89 (L) 3L SOT-23 (M) ANODE 1 2 3 CATHODE ANODE 1 8 REF 2 7 ANODE ANODE 3 6 ANODE 4 5 N/C CATHODE REF N/C ANODE Bottom View Advanced Monolithic Systems, Inc. 1 REF Top View 2 3 ANODE CATHODE Top View REF CATHODE Top View 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS431 ABSOLUTE MAXIMUM RATINGS (Note 1) Cathode Voltage (VZ) Continuous Cathode Current (IZ) Reference Input Current (IREF) Junction Temperature (TJ) 37V -10mA to +150mA 10mA -40°C to +125°C Storage temperature Lead Temperature (Soldering, 10sec.) Internal Power Dissipation (PD) TO-92 Package SO-8 Package SOT-89 Package SOT-23 Package Thermal Resistance (ϕJA) TO-92 Package SO-8 Package SOT-89 Package SOT-23 Package -65°C to +150°C 265°C 0.78W 0.71W 0.91W 0.28W 160°C/W 175°C/W 110°C/W 410°C/W Note 1 : Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. ELECTRICAL CHARACTERISTICS Electrical Characteristics at IZ =10 mA and TA = +25°C unless otherwise specified. Parameter Conditions Min Reference Voltage 2.489 AMS431A Typ Max 2.495 2.501 8.0 8.0 Min 2.483 AMS431B Typ Max 2.495 2.507 15 8.0 15 8.0 Min 2.470 AMS431C Typ Max Units 2.495 2.520 V 15 8.0 15 mV 15 8.0 15 mV Deviation of Reference Input Voltage over Temperature VZ = VREF (circuit 1) TA = +25°C to +85°C TA = -40°C to +25°C Ratio of Change in Reference Voltage to Cathode Voltage VZ from VREF to 10V -0.5 -2.7 -0.5 -2.7 -0.5 -2.7 mV/V VZ from VREF to 36V -1.0 -2.0 -1.0 -2.0 -1.0 -2.0 mV/V Reference Input Current R1 =10kΩ, R2 = ∞Ω (test circuit 2) 0.5 4.0 0.5 4.0 0.5 4.0 µA Reference Input Current Deviation over Temperature R1 =10kΩ, R2 = ∞Ω TA = Full Range (test circuit 2) 0.4 1.2 0.4 1.2 0.4 1.2 µA Off State Cathode Current VZ = 36V, VREF = 0V ( test circuit 3) 0.04 0.5 0.04 0.5 0.04 0.5 µA f < 1KHz, VZ = VREF 0.25 0.5 0.25 0.5 0.25 0.5 Ω 100 250 100 250 100 250 µA Dynamic Output Impedance Minimum Operating Current IZ =100µA to 100mA (test circuit 1) VZ = VREF (test circuit 1) RECOMMENDED OPERATING CONDITIONS: Cathode Voltage, (VZ) Cathode Current, (IZ) Min VREF 0.25mA Advanced Monolithic Systems, Inc. Max 36 V 120mA 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS431 TEST CIRCUITS VZ = VREF VIN VZ VIN IREF R1 IZ VZ VIN IZ OFF IREF IZ VREF R2 Figure 1. Test Circuit for VZ=VREF VREF Figure 2. Test Circuit for VREF vs IZ. Test circuit for IREF. Figure 3. Test Circuit for Off-State Current TYPICAL APPLICATIONS Single Supply Comparator with Temperature Compensated Threshold Shunt Regulator VO V+ V+ R1 VREF OUT R2 VON ≈ 2V VOFF = V+ IN VTH ≈ 2.5V VO ≈ (1+R1/R2)VREF GND Series Regulator Higher Current Shunt Regulator V+ V+ 30Ω VO R1 0.01µF R1 R1 VO R2 VO ≈ (1+R1/R2)VREF Advanced Monolithic Systems, Inc. VO ≈ (1+R1/R2)VREF 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS431 TYPICAL APPLICATIONS (Continued) Over Voltage/Under Voltage Protection Circuit Voltage Monitor V+ V+ OUT ON WHEN LOW < V+ < HIGH LIMIT LIMIT R1B R1B R1A R1A R2A R2B R2A R2B LOW LIMIT ≈ VREF( 1+R1B/R2B)+VBE LOW LIMIT ≈ VREF( 1+R1A/R2A) LOW LIMIT ≈ VREF( 1+R1B/R2B)+VBE LOW LIMIT ≈ VREF( 1+R1A/R2A) Delay Timer LED ON WHEN LOW LIMIT < V+ < HIGH LIMIT Current Limiter or Current Source V+ IO V+ RCL R OFF ON C IO =VREF/RCL DELAY = R*C*ln*V+/(V+)-VREF Constant Current Sink V+ IO RS IO = VREF/RS Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS431 TYPICAL PERFORMANCE CHARACTERISTICS Input Current vs V 500 I Z MIN 400 300 200 100 0 1.0 2.0 CATHODE VOLTAGE (V) 3.0 INPUTT CURRENT (mA) REFERENCE VOLTAGE (V) INPUTT CURRENT (µA) 150 1000 ΤΑ = 25°C VZ = V REF 0 Input Current vs V Z Thermal Information Z SOT-89 500 TO-92 SO-8 SOT-23 100 ΤΑ = 25°C VZ = V REF 100 50 0 25 70 85 125 TEMPERATURE (° C) 0 1.0 2.0 CATHODE VOLTAGE (V) 3.0 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 3L TO-92 PLASTIC PACKAGE (N) 0.060±0.005 (1.524±0.127) DIA 0.180±0.005 (4.572±0.127) 0.180±0.005 (4.572±0.127) 0.060±0.010 (1.524±0.254) 0.90 (2.286) NOM 0.140±0.010 (3.556±0.127) 5° NOM 0.500 (12.70) MIN 0.050±0.005 (1.270±0.127) Advanced Monolithic Systems, Inc. 0.050 (1.270) MAX 10° NOM UNCONTROLLED LEAD DIMENSIONS 0.016±0.003 (0.406±0.076) 0.015±0.002 (0.381±0.051) N (TO-92 ) AMS DRW# 042391 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS431 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). 8 LEAD SOIC PLASTIC PACKAGE (S) 0.189-0.197* (4.801-5.004) 8 7 6 5 0.228-0.244 (5.791-6.197) 0.150-0.157** (3.810-3.988) 1 2 3 4 0.010-0.020 x 45° (0.254-0.508) 0.053-0.069 (1.346-1.752) 0.004-0.010 (0.101-0.254) 0.014-0.019 (0.355-0.483) 0.008-0.010 (0.203-0.254) 0.050 (1.270) TYP 0°-8° TYP 0.016-0.050 (0.406-1.270) S (SO-8 ) AMS DRW# 042293 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE SOT-89 PLASTIC PACKAGE (L) 0.173-0.181 (4.40-4.60) 0.055-0.063 (1.40-1.60) 0.014-0.017 (0.35-0.44) 0.064-0.072 (1.62-1.83) 0.155-0.167 (3.94-4.25) 0.084-0.090 (2.13-2.29) 0.090-0.102 (2.29-2.60) 0.035-0.047 (0.89-1.20) 0.059 (1.50) BSC 0.014-0.019 (0.36-0.48) 0.017-0.022 (0.44-0.56) L (SOT-89 ) AMS DRW# 042392 0.118 (3.00) BSC Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS431 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). 3 LEAD SOT-23 PLASTIC PACKAGE (M) 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) 10° NOM 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) 10° NOM 0.018-0.024 (0.457-0.610) (SOT-23 ) AMS DRW# 051991 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140