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| Advanced Monolithic Systems FEATURES * Low Temperature Coefficient * Low Output Noise * Operating Current 100A to 5mA * Low Dynamic Impedance * Tight Output Voltage Tolerance * Available in the sub-miniature SOT-23 Package AMS255 MICROPOWER SHUNT VOLTAGE REFERENCE RoHS compliant APPLICATIONS * 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 100A 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 -40C to +85C 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 +85C -40 to +85C 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. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS255 ABSOLUTE MAXIMUM RATINGS (Note 1) Reverse Current Forward Current Lead Temperature (25 sec) 10mA 10mA 265C Storage temperature Internal Power Dissipation (PD) SOT-23 Package Thermal Resistance (JA) SOT-23 Package -65C to +150C 0.28W 410C/W ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR =1000 A and TA = +25C unless otherwise specified. Parameter Output Voltage Output Impedance RMS Noise Voltage Temperature Coefficient Turn-On Settling Operating Current 10Hz f 10kHz TA = Full Range 0.1% of VOUT (Note 3) 0.1 30 5 0.1 Conditions Min. 2.475 AMS255A Typ. Max. 2.500 0.6 15 60 2.525 2 Min. 2.450 AMS255B Typ. Max. 2.500 0.6 30 100 30 5 2.550 2 Units V Vrms ppm/C sec 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 = 25C. Note 3: Optimum performance is obtained at currents below 1000A. TYPICAL APPLICATIONS Shunt Regulator VS +5V 5% Precision 2.500V Reference RS VR AMS255 IQ + IL IL IQ AMS255 904, 1% +2.500V 47k, 0.1% 47k, 0.1% +5V 0.1F 1/2 LMC6062 + -2.500V 0.1F -5V Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS255 TYPICAL APPLICATIONS Precision 1A to 1mA Current Sources AMS255 12V AMS255 R1 20k 2 - 8 1/2 LMC6062 1 4 R1 20k 2 3 IOUT* -1.0V TO -12V + 8 1/2 LMC6062 3 4 + IOUT* - 1 R2 R2 1.0V TO 12V -15V IOUT=2.5V/R2 TYPICAL PERFORMANCE CHARACTERISTICS Temperature Drift for Different Average Temperature Coefficient +0.5 +0.4 +0.3 IR = 150 A Reverse Characteristics and Minimum Operating Current 120 10 TJ =25 C Noise Voltage vs Frequency IR = 200 A REVERSE CURRENT ( A) 100 80 60 40 20 0 2 6 8 4 REVERSE VOLTAGE (V) 10 5.0 TJ =25 C +0.2 +0.1 0 -0.1 -0.2 -0.3 -51ppm/ C -22ppm/ C +12ppm/ C NOISE (mV/Hz) VR CHANGE (%) 2.0 1.0 0.5 0.2 0.1 -0.4 -0.5 -40 -20 0 20 40 60 80 TEMPERATURE ( C) 100 0 1 10 1k 10k 100 FREQUENCY (Hz) 100k Ouput Impedance vs Frequency 1k IR= 100mA TJ =25 C, IR= 0.1IR Ouput Impedance vs Frequency 1k IR= IRMIN+100A TJ =25 C, IR= 0.1IR CL= 0 IMPEDANCE () CL= 0 CL= 1F TANTALUM IMPEDANCE () 100 100 10 10 CL= 1F TANTALUM 1 XCL 1 XCL 0.1 100 1k 10k 100k FREQUENCY (Hz) 1M 0.1 100 1k 10k 100k FREQUENCY (Hz) 1M Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 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. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 |
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