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| Advanced Monolithic Systems FEATURES * Fixed and Adjustable Versions Available * Output Current up to 500mA * Very Low Quiescent Current * Reverse Battery Protection * Input-output Differential less than 0.6V * Short Circuit Protection * Internal Thermal Overload Protection * Overvoltage Protection * ON/OFF Pin AMS500 LOW COST 500mA REGULATOR APPLICATIONS * Cellular Telephones * Portable Consumer Equipment * Portable (Notebook) Computers * Battery Powered Systems * Portable Instrumentation * Radio Control Systems * CD/DVD drives * Automotive GENERAL DESCRIPTION The AMS500 series consists of positive fixed and adjustable voltage regulators ideally suited for use in battery-powered systems. These devices feature very low quiescent current of 0.8mA or less when supplying 50mA loads. This unique characteristic and the low input-output differential required for proper regulation (0.2V for output currents of 100mA) make the AMS500 ideal to use for standby power systems. Internal circuitry of AMS500 is protected from input fault conditions caused by input voltages that exceed maximum rated input voltage. During line transients, when the input voltage to the regulator can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both internal circuits and the load. The AMS500 series also includes internal current limiting, thermal shutdown. The AMS500 is offered in 3 lead TO-92, SOT-89 and 5 leads SOT-23 packages. ORDERING INFORMATION OUTPUT PACKAGE TYPE SOT-23-5 AMS500M1-X AMS500M1 TEMP. RANGE IND IND 3L TO-92 SOT-89 VOLTAGE FIXED AMS500N-X AMS500L-X ADJ. X = 2.0V, 2.5V, 3.0V, 3.3V, 3.5V, 4.0V, 5.0V. PIN CONNECTIONS TO-92 Plastic Package (N) OUTPUT INPUT SOT-89 (L) 5 Lead SOT-23 (M1) INPUT 1 GROUND 2 ON/OFF 3 4 ADJ / N/C 5 OUTPUT GND INPUT 1 2 GND 3 OUTPUT Bottom View Top View Top View Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS500 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage Operating Overvoltage Protection Internal Power Dissipation (Note 4) 25V 26V to 40V Internally Limited Maximum Junction Temperature +125C Storage Temperature -65C to +150C Lead Temperature (Soldering 10 sec) 230C ESD 2000V ELECTRICAL CHARACTERISTICS Electrical Characteristics at VIN =6.3V, IO =5mA, TJ=25C, C2 = 22F unless otherwise specified. PARAMETER Fixed Output Voltage Versions Output Voltage Tolerance 6.3V V 25V, IO=100 mA IN CONDITIONS AMS500-X Min. -4.0 5.0 5 5 5 15 20 20 0.25 0.40 0.45 0.55 0.2 2 5 12 50 10 80 25 28 40 10 30 25 40 60 75 0.40 0.50 0.60 0.80 0.5 4 10 Typ. Max. +4.0 Units % % mV mV mV mV mV mV mV mV mV mV mA mA mA mA V rms F dB V V Line Regulation 6V V 15V IN 15V V 25V IN Load Regulation 5mA I 100 mA O Dropout Voltage 5mA 10 200 mA 5mA 10 350 mA 5mA 10 500 mA I = 100 mA O I = 200 mA O I = 350 mA O I = 500 mA O Quiescent Current I 10 mA, O I = 100 mA O I 200 mA O I = 350 mA O Output Noise Voltage Output Bypass Capacitor Ripple Rejection Maximum Operational Input Voltage Maximum Line Transient 10Hz-100kHz, COUT = 100F ESR=0.1 to 10 fO =120Hz RL = 500, VO 5.5V T = 1ms, 100ms 35 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS500 ELECTRICAL CHARACTERISTICS Electrical Characteristics at VIN =6V, VOUT =3V IO =5mA, TJ=25C, R1 =27k, C2 = 2F unless otherwise specified. PARAMETER Adjustable Version Reference Voltage IO 100 mA, -40C T 125C, J CONDITIONS (Note 2) AMS500-X Min. 1.20 Typ. 1.235 1.235 Max. 1.27 1.290 24 Units V V V mV/V % % % % V V V V mA mA mA mA Vrms/V F %/1000hr dB V V R1=27k, Measured from VOUT to Adj. Pin Output Voltage Range Line Regulation Load Regulation 6V V 25V IN 1.180 2 .02 0.3 0.5 1.0 1.0 0.05 0.3 0.5 0.6 0.18 2.0 5.0 12 100 10 0.4 0.02 21 22 40 1.5 0.5 1 1.5 2.0 0.40 0.50 0.60 0.80 0.5 4 10 5mA I 100 mA O Dropout Voltage 5mA 10 200 mA 5mA 10 350 mA 5mA 10 500 mA I = 100 mA O I = 200 mA O I = 350 mA O I = 500 mA O Quiescent Current I = 0 mA, O I = 100 mA O I = 200 mA O I = 350 mA O Output Noise Voltage Output Bypass Capacitor Long Term Stability Ripple Rejection Maximum Operational Input Voltage Maximum Line Transient On/Off Threshold Voltage On Off On/Off Threshold Current 10Hz-100kHz ESR=0.1 to 10 T =1000hr fO = 120Hz IO = 10mA, Reference Voltage 1.5V T = 1ms, 100ms VO = 3V 35 1.8 2.5 VOFF = 2.4V 2.0 35 1.5 V V 60 A Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: To ensure constant junction temperature, low duty cycle pulse testing is used. Note 3: Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25C. Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature TJ(MAX), the junction-to ambient thermal resistance J-A and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is calculated using: P(MAX) = TJ(MAX) - TA J - A Where the value of the junction-to-ambient thermal resistance are as follows: 195C/W for TO-92 (N), 110C/W for SOT-89 (L) and 220C/W for 5 lead SOT-23. Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS500 TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage INPUT OUTPUT DIFFERENTIAL (V) INPUT OUTPUT DIFFERENTIAL (V) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 80 120 40 JUNCTION TEMPERATURE ( C) IO = 350mA IO = 200mA IO = 150mA IO = 100mA Dropout Voltage 0.6 OUTPUT VOLTAGE (V) 0.5 0.4 0.3 0.2 0.1 0 0 100 200 300 400 500 OUTPUT CURRENT (mA) 600 6.0 5.0 4.0 3.0 2.0 0 Low Voltage Behavior AMS500-3.3 IO = 500mA 2.0 3.0 4.0 5.0 6.0 INPUT VOLTAGE (V) Low Voltage Behavior 6.0 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 5.0 4.0 3.0 2.0 0 2.0 3.0 4.0 5.0 6.0 INPUT VOLTAGE (V) AMS500-5.0 IO = 500mA Output at Voltage Extremes 6 5 4 3 2 1 0 -1 -20 -10 0 10 20 30 40 50 60 INPUT VOLTAGE (V) AMS500-3.3 RL=500m Output at Voltage Extremes 6 AMS500-5.0 5 OUTPUT VOLTAGE (V) 4 3 2 1 0 RL=500m -1 -20 -10 0 10 20 30 40 50 60 INPUT VOLTAGE (V) Reference Voltage 1.30 REFERENCE VOLTAGE (V) 1.28 1.26 1.24 1.22 1.20 1.18 1.16 1.14 1.12 1.10 0 3 6 9 12 15 18 21 24 OUTPUT VOLTAGE (V) AMS500 ADJUSTABLE Peak Output Current 1200 OUTPUT CURRENT (mA) RIPPLE REJECTION (dB) 1000 800 600 400 200 0 0 20 10 INPUT VOLTAGE (V) 30 85 80 75 70 65 60 55 50 45 1 Ripple Rejection C2 = 22 F TANTALUM TJ= 25C C2 = 100 F ALUM IO= 10mA 10 100 1k 10k 100k 1M FREQUENCY (Hz) Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS500 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Quiescent Current 17.5 QUIESCENT CURRENT (A) 15 12.5 10 7.5 5.0 2.5 0 -2.5 0 1 23 45 678 INPUT VOLTAGE (V) 9 10 IO= 10mA Quiescent Current 25 QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) 10 8 6 4 2 0 0 50 100 150 200 250 300 350 OUTPUT CURRENT (mA) VIN = 6V Quiescent Current 20 15 IO = 200mA 10 3 2 1 ~ ~ IO = 100mA IO = 50mA IO = 0mA ~ ~ 0 -40 0 40 80 120 TEMPERATURE ( C) APPLICATION NOTES Definition of Terms Dropout Voltage: The input-output voltage differential at which the circuit stops to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100mV from the nominal voltage obtained at 1V input, dropout voltage is dependent upon load current and junction temperature. Input Voltage: The DC voltage applied to the input terminal with respect to ground. Input-Output Differential: The voltage difference between the unregulated input voltage and the regulated output voltage for which the regulator will regulate. Line Regulation: The change in output voltage for a change in the input voltage. The line regulation is measured under conditions of low dissipation or by using low duty cycle pulse testing such that the average chip temperature is not significantly affected. Load Regulation: The change in output voltage for a change in load current at constant chip temperature. Long term stability: Output voltage stability under accelerated life-test conditions after 1000 hours with maximum rated voltage and junction temperature. Output Noise Voltage: The rms AC voltage at the output, with constant load and no input ripple, measured over a specified frequency range. Quiescent Current: That part of the positive input current that does not contribute to the positive load current. The regulator ground lead current. Ripple Rejection: The ratio of the peak-to -peak input ripple voltage to the peak-to-peak output ripple voltage at specified frequency. Temperature Stability of VO: The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. External capacitor The AMS500 series require an output capacitor of 10F or greater to ensure device stability. Without the capacitor the device may oscillate Most type of tantalum or electrolytic capacitor can be used in the applications. A critical characteristic of the capacitors is an ESR value of 5 or less and a resonant frequency above 500kHz. The value of this capacitor can be increased without limits. For higher loads, the value of the capacitor should be increased, specialy when the output voltage is set for 2.5V or less. The AMS500 lowest fixed output voltage value is 2.0V Typical application circuit (adjustable output) V IN 100k OUT OFF ON/OFF 10F ON GND AMS500 ADJUSTABLE ADJ R2 R1 28k + C1 22F VOUT Minimum Load In circuits using the fixed output voltage versions, minimum load is not required. For circuits using the adjustable device, the value of R1 and R2 should be chosen such, that a current of approximately 40A flows through the network. The reference voltage (1.235V) is measured between the adjust pin and VOUT. The output voltage can be set by the two resistors R1 and R2 using the following equation: R1 + R2 VO = VREF R1 The value of R1 is recommended to be between 25k to 30 k, and the value of R2 will set the output voltage. Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS500 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 3L TO-92 PLASTIC PACKAGE (N) 0.0600.005 (1.5240.127) DIA 0.1800.005 (4.5720.127) 0.0600.010 (1.5240.254) 0.1400.010 (3.5560.127) 0.1800.005 (4.5720.127) 0.90 (2.286) NOM 5 NOM 0.500 (12.70) MIN 10 NOM 0.050 (1.270) MAX UNCONTROLLED LEAD DIMENSIONS 0.0500.005 (1.2700.127) 0.0160.003 (0.4060.076) 0.0150.002 (0.3810.051) N (TO-92 ) AMS DRW# 042391 SOT-89 PLASTIC PACKAGE (L) 0.173-0.181 (4.40-4.60) 0.064-0.072 (1.62-1.83) 0.055-0.063 (1.40-1.60) 0.014-0.017 (0.35-0.44) 0.155-0.167 (3.94-4.25) 0.090-0.102 (2.29-2.60) 0.084-0.090 (2.13-2.29) 0.035-0.047 (0.89-1.20) 0.059 (1.50) BSC 0.118 (3.00) BSC 0.014-0.019 (0.36-0.48) 0.017-0.022 (0.44-0.56) L (SOT-89 ) AMS DRW# 042392 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS500 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). 5 LEAD SOT-23 PLASTIC PACKAGE (M1) 0.110-0.120 (2.794-3.048) 0.102-0.118 (2.60-3.00) 0.059-0.070 (1.50-1.75) 0.037 (0.95) TYP 0.018-0.024 (0.457-0.610) 0.014-0.020 (0.350-0.50) 10 NOM 0.036-0.051 (0.090-1.30) 0.0035-0.0080 (0.090-0.20) 0.003 (0.150) MAX 0.075 (1.90) TYP 10 NOM 0.018-0.024 (0.457-0.610) (SOT-23-5 ) AMS DRW# 051001 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 |
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