Advanced Monolithic Systems AMS255 MICROPOWER SHUNT VOLTAGE REFERENCE FEATURES APPLICATIONS • Low Temperature Coefficient • Low Output Noise • Operating Current 100µ µ A to 5mA • Low Dynamic Impedance • Tight Output Voltage Tolerance • Available in the sub-miniature SOT-23 Package • Battery Powered Systems • Instrumentation • Energy Management • Automotive • Precision Audio Components • Data Acquisition Systems GENERAL DESCRIPTION The AMS255 is a two-terminal band-gap voltage reference diode featuring low dynamic impedance and good temperature coefficient, operating over a 100µA to 5mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS255 band-gap reference uses only transistors and resistors, low noise and good long term stability result. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. These voltage references can be used to make portable meters, regulators or general purpose analog circuitry. The AMS255 is operational in the full industrial temperature range of -40°C to +85°C and is available in small space saving SOT-23 package. ORDERING INFORMATION: MAX. TEMPCO 50ppm/°C 100ppm/°C PACKAGE TYPE 3 LEAD SOT-23 AMS255AM AMS255BM OPERATING TEMP. RANGE -40 to +85°C -40 to +85°C PIN CONNECTIONS 3L SOT-23 (M) 3 * 1 + 2 - *This pin must be left floating or connected to pin 2 Top View Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS255 ABSOLUTE MAXIMUM RATINGS (Note 1) Reverse Current Forward Current Lead Temperature SOT-23 packages: Vapor phase (60 sec) Infrared (15 sec.) 10mA 10mA Storage temperature Internal Power Dissipation (PD) SOT-23 Package Thermal Resistance (θJA) SOT-23 Package 215°C 220°C -65°C to +150°C 0.28W 410°C/W ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR =1000 µA and TA = +25°C unless otherwise specified. Parameter Conditions Output Voltage AMS255A Min. Typ. Max. AMS255B Min. Typ. Max. 2.475 2.450 Output Impedance RMS Noise Voltage 10Hz ≤ f ≤ 10kHz Temperature Coefficient TA = Full Range Turn-On Settling 0.1% of VOUT (Note 3) Operating Current 2.500 2.525 0.6 2 15 2.500 2.550 V 0.6 2 Ω µVrms 30 60 100 30 5 0.1 ppm/°C µsec 30 0.1 Units 5 mA Note1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C. Note 3: Optimum performance is obtained at currents below 1000µA. TYPICAL APPLICATIONS Precision ± 2.500V Reference Shunt Regulator VS RS +5V ±5% IQ + IL VR AMS255 904Ω, 1% IL IQ +2.500V AMS255 47kΩ, 0.1% 47kΩ, 0.1% +5V 0.1µF 1/2 LMC6062 -2.500V + 0.1µF -5V Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS255 TYPICAL APPLICATIONS Precision 1µ µ A to 1mA Current Sources AMS255 12V AMS255 R1 20k 2 - R1 20k 8 1/2 LMC6062 3 2 4 + IOUT* - 8 1/2 LMC6062 3 4 + 1 R2 IOUT* -1.0V TO -12V 1 R2 1.0V TO 12V -15V IOUT=2.5V/R2 TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics and Minimum Operating Current Temperature Drift for Different Average Temperature Coefficient REVERSE CURRENT (µA) I R = 150 µ A +0.4 VR CHANGE (%) +0.3 +0.2 +12ppm/° C +0.1 0 -0.1 -0.2 -22ppm/° C -0.3 -51ppm/° C -0.4 -0.5 -40 -20 Noise Voltage vs Frequency 120 10 80 60 40 20 100 2 6 8 4 REVERSE VOLTAGE (V) 10 0.5 1 10 1k 10k 100 FREQUENCY (Hz) 100k Ouput Impedance vs Frequency 1k 100 IMPEDANCE (Ω) IMPEDANCE (Ω) 1.0 0.1 0 IR= 100 mA TJ =25° C, ∆IR= 0.1I R C L= 0 C L= 1 µF TANTALUM 10 2.0 0.2 Ouput Impedance vs Frequency 1k T J =25° C 5.0 0 0 20 40 60 80 TEMPERATURE ( ° C) I R = 200 µ A TJ =25° C 100 NOISE (mV/√Hz) +0.5 1 IR= I RMIN+100µA TJ =25° C, ∆IR= 0.1I R C L= 0 100 C L= 1 µF TANTALUM 10 1 XC L XC L 0.1 0.1 100 1k 10k 100k FREQUENCY (Hz) Advanced Monolithic Systems, Inc. 1M 100 1k 10k 100k FREQUENCY (Hz) 1M 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS255 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 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