AMS3431

Advanced Monolithic Systems FEATURES • Trimmed 0.25% Reference • Wide Operating Current Range 250µA to 150mA • Low Dynamic Output Impedance • Low Output Noise • Nominal Temperature Range to 85°C • Temperature-Compensated: 60ppm/°C • Internal Amplifier with 150mA Capability AMS3431 PRECISION ADJUSTABLE SHUNT REGULATOR RoHS compliant APPLICATIONS • Battery Powered Systems • Switching Power Supplies • Adjustable Power Supplies • Linear Regulators • Error Amplifiers • Notebook/Personal Computer • Monitors/ VCR/ TV • Pagers GENERAL DESCRIPTION The AMS3431 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. AMS3431 is available in the space saving SOT-23 package and in the TO-92 package. ORDERING INFORMATION: TOL. ±0.25% ±0.5% ±1.0% PACKAGE TYPE TO-92 AMS3431AN AMS3431BN AMS3431CN 3 LEAD SOT-23 AMS3431AM AMS3431BM AMS3431CM OPERATING TEMPERATURE RANGE -40 to +85° C -40 to +85° C -40 to +85° C PIN CONNECTIONS TO-92 Plastic Package (N) 3L SOT-23 (M) ANODE 1 2 3 CATHODE ANODE REF CATHODE REF Bottom View Top View Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS3431 ABSOLUTE MAXIMUM RATINGS (Note 1) Cathode Voltage (VZ) Continuous Cathode Current (IZ) Reference Input Current (IREF) Junction Temperature (TJ) Storage Temperature Lead Temperature (Soldering, 25sec.) 37V -10mA to +150mA 10mA -40°C to +125°C -65°C to +150°C 265°C Internal Power Dissipation (PD) TO-92 Package SOT-23 Package Thermal Resistance (ϕJA) TO-92 Package SOT-23 Package 0.78W 0.28W 160°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 Reference Voltage Deviation of Reference Input Voltage over Temperature Ratio of Change in Reference Voltage to Cathode Voltage Reference Input Current Reference Input Current Deviation over Temperature Off State Cathode Current Dynamic Output Impedance VZ = VREF (circuit 1) TA = +25°C to +85°C TA = -40°C to +25°C VZ from VREF to 10V VZ from VREF to 36V R1 =10kΩ, R2 = ∞Ω (test circuit 2) R1 =10kΩ, R2 = ∞Ω TA = Full Range (test circuit 2) VZ = 36V, VREF = 0V ( test circuit 3) f < 1KHz, VZ = VREF IZ =100µA to 100mA (test circuit 1) VZ = VREF (test circuit 1) 100 250 100 250 100 250 µA 0.25 0.5 0.25 0.5 0.25 0.5 Ω 0.4 1.2 0.4 1.2 0.4 1.2 µA Conditions Min 2.489 AMS3431A Typ Max 2.495 8.0 8.0 -0.5 -1.0 0.5 2.501 15 15 -2.7 -2.0 4.0 Min 2.483 AMS3431B Typ Max 2.495 8.0 8.0 -0.5 -1.0 0.5 2.507 15 15 -2.7 -2.0 4.0 Min 2.470 AMS3431C Typ Max 2.495 8.0 8.0 -0.5 -1.0 0.5 2.520 15 15 -2.7 -2.0 4.0 Units V mV mV mV/V mV/V µA 0.04 0.5 0.04 0.5 0.04 0.5 µA Minimum Operating Current RECOMMENDED OPERATING CONDITIONS: Min VREF 0.25mA Max 36 V 120mA Cathode Voltage, (VZ) Cathode Current, (IZ) Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS3431 TEST CIRCUITS VIN VZ = VREF VIN VZ VIN VZ IREF IZ VREF R1 IREF IZ IZ OFF R2 VREF Figure 1. Test Circuit for VZ=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 VO R1 VREF R2 IN VTH ≈ 2.5V V+ Shunt Regulator V+ OUT VON ≈ 2V VOFF = V+ VO ≈ (1+R1/R2)VREF GND Series Regulator V+ Higher Current Shunt Regulator V+ VO 30Ω R1 0.01µF R1 VO R2 R1 VO ≈ (1+R1/R2)VREF VO ≈ (1+R1/R2)VREF Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS3431 TYPICAL APPLICATIONS (Continued) Over Voltage/Under Voltage Protection Circuit V+ R1B OUT ON WHEN LOW < V+ < HIGH LIMIT LIMIT Voltage Monitor V+ 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) LIMIT LED ON WHEN LOW LIMIT < V+ < HIGH Delay Timer V+ Current Limiter or Current Source IO V+ RCL R OFF ON C DELAY = R*C*ln*V+/(V+)-VREF IO =VREF/RCL Constant Current Sink V+ IO RS IO = VREF/RS Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS3431 TYPICAL PERFORMANCE CHARACTERISTICS Input Current vs VZ Τ Α = 25° C VZ = VREF Thermal Information 1000 REFERENCE VOLTAGE (V) INPUTT CURRENT ( mA) 150 Input Current vs VZ ΤΑ = 25° C VZ = VREF INPUTT CURRENT ( µ A) 500 400 300 200 100 0 0 1.0 2.0 CATHODE VOLTAGE (V) 3.0 IZ MIN 100 500 TO-92 50 SOT-23 100 0 25 70 85 TEMPERATURE (° C) 125 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) 0.060±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) NOM 5° NOM 0.500 (12.70) MIN 10° NOM 0.050 (1.270) MAX 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) N (TO-92 ) AMS DRW# 042391 Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS3431 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. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723