Advanced Monolithic Systems AMS285/AMS385 ADJUSTABLE MICROPOWER VOLTAGE REFERENCE DIODE RoHS compliant FEATURES APPLICATIONS • Adjustable from 1.24V to 5.30V • Operating Current 10µA to 20mA • 1% and 2% Initial Tolerance • 1Ω Dynamic Impedance • Low Temperature Coefficient • 1.2V Device and 2.5V Device also available AMS285-1.2 and AMS285-2.5 series, respectively AMS385-1.2 and AMS385-2.5 series. • Battery Powered Systems • Instrumentation • A/D, D/A Converters • Temperature measurement • Current sources • Notebook/Personal Computer • Monitors/ VCR/ TV • Pagers GENERAL DESCRIPTION The AMS285/AMS385 are three-terminal micropower band-gap voltage reference diodes. They feature a very low dynamic impedance and good temperature coefficient, operating from 1.24V to 5.3V and over a 10µA to 20mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS285/AMS385 is a band-gap reference, uses only transistors and resistors, low noise and good long-term stability result. Careful design of the AMS285/AMS385 has made the device exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. The extremely low power drain of the AMS285/AMS385 makes these reference diodes useful for micropower circuitry. These voltage references can be used to make portable meters, regulators or general purpose analog circuitry with battery life approaching shelf life. Further more, the wide operating current allows it to replace older references with a tight tolerance part. The AMS285 is operational in the full industrial temperature range of -40°C to 85°C while AMS385 is operating over a 0°C to 70°C temperature range. The AMS285/AMS385 are available in TO-92, SO-8 and SOT-89 packages. ORDERING INFORMATION: TOL. ±12mV ±25mV ±25mV ±12mV ±25mV ±25mV PACKAGE TYPE TO-92 AMS285AN AMS285BN AMS285CN AMS385AN AMS385BN AMS385CN 8 LEAD SOIC AMS285AS AMS285BS AMS285CS AMS385AS AMS385BS AMS385CS Advanced Monolithic Systems, Inc. SOT-89 AMS285AL AMS285BL AMS285CL AMS385AL AMS385BL AMS385CL www.advanced-monolithic.com OPERATING TEMPERATURE RANGE -40 to 85° C -40 to 85° C -40 to 85° C 0 to 70° C 0 to 70° C 0 to 70° C Phone (925) 443-0722 Fax (925) 443-0723 AMS285/AMS385 ABSOLUTE MAXIMUM RATINGS Reverse Current Forward Current Operating Temperature Range AMS285 AMS385 30mA 10mA Storage temperature Soldering information ( 25 Sec) -55°C to +150°C 265°C -40°C to 85°C 0°C to 70°C ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified. AMS285A Typ Max AMS285B Typ Max AMS285C Typ Max Parameter Conditions Reference Voltage IR =100 µA Dynamic Output Impedance IAC =0.1IR, f = 20Hz VOUT = VREF 0.3 0.3 0.3 VOUT = 5.3V 0.7 0.7 0.7 10µA ≤IR ≤1mA 0.2 1.0 0.2 1.0 0.2 1.0 mV 4 10 4 10 4 10 mV µA µA Reference Voltage Change with Current Min 1.228 1mA ≤IR ≤20mA 1.240 1.252 Min 1.215 1.240 1.265 Min 1.215 1.240 1.265 V Ω Min. Operating Current (Note 4) VOUT = VREF 6 9 6 9 6 9 VOUT = 5.3V 30 45 30 45 30 45 Wide Band Noise 10Hz ≤ f ≤ 10kHz (Note 5) Units VOUT = VREF 50 50 50 µVrms VOUT = 5.3V 170 170 170 µVrms Temperature Coeff. 25 50 100 150 ppm/°C (Note 6) Long Term Stability TA=25°C±.1°C (Note 5) T = 1000 Hr 20 20 20 ppm ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified. AMS285A Typ Max AMS285B Typ Max AMS285C Typ Max Parameter Conditions Reference Voltage IR =100 µA Dynamic Output Impedance IAC =0.1IR, f = 20Hz VOUT = VREF 0.3 0.3 0.3 VOUT = 5.3V 0.7 0.7 0.7 10µA ≤IR ≤1mA 0.2 1.0 0.2 1.0 0.2 1.0 mV 4 10 4 10 4 10 mV µA µA Reference Voltage Change with Current Min 1mA ≤IR ≤20mA 1.228 1.240 1.252 Min 1.215 1.240 1.265 Min 1.215 1.240 1.265 V Ω Min. Operating Current (Note 4) VOUT = VREF 6 9 6 9 6 9 VOUT = 5.3V 30 45 30 45 30 45 Wide Band Noise 10Hz ≤ f ≤ 10kHz (Note 5) Units VOUT = VREF 50 50 50 µVrms VOUT = 5.3V 170 170 170 µVrms Temperature Coeff. 25 50 100 150 ppm/°C (Note 6) Long Term Stability TA=25°C±.1°C (Note 5) T = 1000 Hr Advanced Monolithic Systems, Inc. 20 www.advanced-monolithic.com 20 Phone (925) 443-0722 20 Fax (925) 443-0723 ppm AMS285/AMS385 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. Note 2: For elevated temperature operation, Tj max is: AMS285 AMS385 +125°C +100°C Thermal Resistance TO-92 ϕ JA (junction to ambient) 170°C/W (0.125” leads) SO-8 SOT-89 165°C/W 160°C/W Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C. Note 4: Guaranteed and 100% production tested. Note 5: Guaranteed but not 100% production tested. These limits are not used to calculate average outgoing quality levels. Note 6: The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating TMAX and TMIN, divided by TMAX - TMIN. The measured temperatures are 0°C, 25°C, 70°C and 85°C. PIN CONNECTIONS TO-92 Plastic Package (N) FB 3 + 2 8L SOIC SO Package (S) + 8 1 1 N/C N/C ADJ 7 6 5 2 3 4 - N/C N/C N/C Bottom View SOT-89 (L) 3 2 1 FB + - Top View Top View 5.0V Reference Precision 10V Reference TYPICAL APPLICATIONS 1.2V Reference 9V 9V R1 50k R1 500k + Advanced Monolithic Systems, Inc. VOUT 10V R2 120k + FB - R1 5k 5V 1.2V AMS385 15V ⎛ R3 ⎞ VOUT = 1.24 ⎜⎜ + 1⎟⎟ ⎝ R2 ⎠ AMS385 FB AMS385 - R3 364k www.advanced-monolithic.com R2 301k 1% + - Phone (925) 443-0722 FB R3 68.1k 1% Fax (925) 443-0723 AMS285/AMS385 TYPICAL APPLICATIONS (Continued) Low AC Noise Reference Current Source +15V 15V R1 100k 2N2905 FB AMS385 + C2 10µF - R4 33 FB AMS385 R2 120k + R1 + VOUT 10V 2N3964 R2 120k C1 0.47µF R3 360kΩ 1 µA< I < 100 mA 1.24V IOUT = R1 25V Low Current Shunt Regulator 200mA Shunt Regulator V+ R3 V+ R4 100 µA< I < 5 mA VOUT 25V R1 + 120k 50 µA< I < 200 mA - FB AMS385 R2 2.4M 2N5115 R1 120k + FB AMS385 VOUT 2.5V 2N2219 R2 120k R3 1k Voltage Level Detector R1 120k + AMS385 - λ D1 Voltage Level Detector R3 200 FB D1 λ R2 1M AMS385 R2 1M R3 330 -5V FB - < -12V LED ON Advanced Monolithic Systems, Inc. R1 120k + > -12V LED ON -5V www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS285/AMS385 TYPICAL APPLICATIONS (Continued) Bidirectional Clamp ± 2.4V Bidirectional Adjustable Clamp ± 1.8V to ± 2.4V VIN I VIN R1 I R2 510k + AMS385 FB D1 1N457 Bidirectional Adjustable Clamp ± 2.4V to ± 6V FB - VOUT D2 1N457 + R1 I R2 510k AMS385 R3 510k VIN FB - AMS385 R3 510k + AMS385 VOUT D2 1N457 D1 1N457 R4 390k D1 1N457 + FB R3 1M - FB - VOUT R2 330k AMS385 + R1 D2 1N457 AMS385 FB R4 330k + REFERENCE VOLTAGE CHANGE (mV) AMS285 Typical Temperature Coefficient 0 ∆Y ∆T -5 -10 -50 -40 -25 0 25 50 75 80 100 125 TEMPERATURE (° C) Advanced Monolithic Systems, Inc. REFERENCE VOLTAGE CHANGE (mV) TYPICAL PERFORMANCE CHARACTERISTICS AMS385 Typical Temperature Coefficient 0 ∆Y ∆T -5 TEMPCO = -10 ∆Y ∆T 0 25 70 TEMPERATURE (° C) www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS285/AMS385 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Reverse Characteristics TA =125° C 6 4 TA =25° C 2 TA =-55° C 0 1.2 10 TA =125° C 1 TA =-55° C 0.1 1 10 REVERSE CURRENT (mA) Temperature Drift of 3 Representative Units TA =125° C 1.250 1.240 1.230 1.220 20 15 VOUT = VREF 10 VOUT = 5.3V 5 70 AMS385 WORST CASE 60 50 40 30 20 TYP @ 25° C 10 0 0 -50 -25 0 25 50 75 100 125 TEMPERATURE (° C) Dynamic Output Impedance 1 Output Noise Voltage 100 10 Minimum Operating Current IR= 100µA -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (° C) 1 80 MINIMUM CURRENT ( µA) IR= 100µA 0.1 0.01 Feedback Current FEEDBACK CURRENT (nA) 5 2 3 4 OUTPUT VOLTAGE (V) Response Time 6 10,000 IR= 100µA VOUT = VREF 5 OUTPUT NOISE (nV/√Hz) VOUT = 5.3V 10 VOUT = 5.3V 1 INPUT 4 VOLTAGE (V) REFERENCE VOLTAGE (V) TA =25° C 0.4 0.2 0.4 0.6 0.8 1.0 1.2 1.4 REVERSE VOLTAGE (V) 25 1.260 IR= 100µA ∆IR= 0.1IR TA =25° C 0.8 0 0 100 TA =-55° C TA =25° C 0.1 -2 FORWARD VOLTAGE (V) 8 0.01 OUTPUT IMPEDANCE ( Ω) Forward Characteristics 100 REVERSE CURRENT (µA) OUTPUT VOLTAGE CHANGE (mV) Reverse Characteristics 10 1,000 VOUT = VREF 100 50k 3 OUTPUT 120k 2 AMS385 1 364k 0 10 0.1 10 10 100 1k 10k FREQUENCY (Hz) 100k Advanced Monolithic Systems, Inc. INPUT 0 10 100 1k 10k FREQUENCY (Hz) www.advanced-monolithic.com 100k Phone (925) 443-0722 0 50 100 150 200 TIME (µs) Fax (925) 443-0723 AMS285/AMS385 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 3 LEAD TO-92 PLASTIC PACKAGE (N) 0.180±0.005 (4.572±0.127) 0.060±0.005 (1.524±0.127) DIA 0.060±0.010 (1.524±0.254) 0.90 (2.286) NOM 0.180±0.005 (4.572±0.127) 0.140±0.010 (3.556±0.127) 5° NOM 0.500 (12.70) MIN 0.050 (1.270) MAX UNCONTROLLED LEAD DIMENSIONS 0.015±0.002 (0.381±0.051) 0.016±0.003 (0.406±0.076) 0.050±0.005 (1.270±0.127) 10° NOM N (TO-92 ) AMS DRW# 042391 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 Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS285/AMS385 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). 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. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723