Advanced AMS1085 Monolithic 3A LOW DROPOUT VOLTAGE REGULATOR Systems RoHS compliant FEATURES APPLICATIONS • • • • Three Terminal Adjustable or Fixed Voltages • • • • High Efficiency Linear Regulators 1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V • • • • Post Regulators for Switching Supplies • • • • Output Current of 3A • • • • Microprocessor Supply • • • • Operates Down to 1V Dropout • • • • Battery Chargers • • • • Load Regulation: 0.1% • • • • Constant Current Regulators • • • • Line Regulation: 0.015% • • • • Notebook/Personal Computer Supplies • • TO-220, TO-263 and TO-252 packages available • • Portable Instrumentation • • • • GENERAL DESCRIPTION The The AMS1085 series of adjustable and fixed voltage regulators are designed to provide 3A output current and to operate down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V at maximum output current, decreasing at lower load currents. On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the stress under overload conditions on both the regulator and power source circuitry. The AMS1085 devices are pin compatible with older three-terminal regulators and are offered in 3 lead TO-220 package, 3 and 2 lead TO-263 (Plastic DD) and TO-252 (D PAK) package. ORDERING INFORMATION: PACKAGE TYPE OPERATING JUNCTION 3 LEAD TO-220 2&3 LEAD TO-263 TO-252 TEMPERATURE RANGE AMS1085CT AMS1085CM AMS1085CD -40 to 125° C AMS1085CT-1.5 AMS1085CM-1.5 AMS1085CD-1.5 -40 to 125° C AMS1085CT-2.5 AMS1085CM-2.5 AMS1085CD-2.5 -40 to 125° C AMS1085CT-2.85 AMS1085CM-2.85 AMS1085CD-2.85 -40 to 125° C AMS1085CT-3.0 AMS1085CM-3.0 AMS1085CD-3.0 -40 to 125° C AMS1085CT-3.3 AMS1085CM-3.3 AMS1085CD-3.3 -40 to 125° C AMS1085CT-3.5 AMS1085CM-3.5 AMS1085CD-3.5 -40 to 125° C AMS1085CT-5.0 AMS1085CM-5.0 AMS1085CD-5.0 -40 to 125° C TO-220 FRONT VIEW TO-252 FRONT VIEW 3 TAB IS PIN CONNECTIONS 3 TAB IS 2 OUTPUT 2 OUTPUT 1 1 ADJUSTABLE VERSION FIXED VERSION 3L TO-263 FRONT VIEW 2L TO-263 FRONT VIEW 1- Ground 1- Adjust 2- V 2- V 3 OUT OUT 3 TAB IS TAB IS 2 OUTPUT 3- V 3- V IN 2 IN OUTPUT 1 1 Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS1085 ABSOLUTE MAXIMUM RATINGS (Note 1) Power Dissipation Internally limited Soldering information Input Voltage 15V Lead Temperature (25 sec) 265°C Operating Junction Temperature Range Thermal Resistance Control Section -40°C to 125°C TO-220 package ϕ = 50°C/W JA Power Transistor TO-263 package -40°C to 150°C ϕ = 30°C/W * JA Storage temperature TO-252 package - 65°C to +150°C ϕ = 80°C/W JA 2 * With package soldering to 0.5in copper area over backside ground plane or internal power plane ϕ can vary from JA 20°C/W to >40°C/W depending on mounting technique. ELECTRICAL CHARACTERISTICS Electrical Characteristics at I = 0 mA, and T = +25°C unless otherwise specified. OUT J Parameter Device Conditions Min Typ Max Units Reference Voltage AMS1085 I = 10 mA 1.238 1.250 1.262 V OUT (Note 2) 10mA ≤ I ≤ 3A, 1.5V≤ (V - V ) ≤ 12V 1.225 1.250 1.270 V OUT IN OUT Output Voltage AMS1085-1.5 1.485 1.500 1.515 V 0 ≤ I ≤ 3A , 3V≤ V ≤ 12V OUT IN (Note 2) 1.470 1.500 1.530 V AMS1085-2.5 0 ≤ I ≤ 3A , 4V≤ V ≤ 12V 2.475 2.500 2.525 V OUT IN 2.450 2.500 2.550 V AMS1085-2.85 0 ≤ I ≤ 3A , 4.35V≤ V ≤ 12V 2.82 2.850 2.88 V OUT IN 2.79 2.850 2.91 AMS1085-3.0 2.970 3.000 3.300 V 0 ≤ I ≤ 3A , 4.5V ≤ V ≤ 12V OUT IN 2.940 3.000 3.360 V AMS1085-3.3 0 ≤ I ≤ 3A , 4.75V ≤ V ≤ 12V 3.267 3.300 3.333 V OUT IN 3.235 3.300 3.365 V AMS1085-3.5 0 ≤ I ≤ 3A , 5V ≤ V ≤ 12V 3.465 3.500 3.535 V OUT IN V 3.430 3.500 3.570 AMS1085-5.0 4.950 5.000 5.050 V 0 ≤ I ≤ 3A , 6.5V ≤ V ≤ 12V OUT IN 4.900 5.000 5.100 V Line Regulation AMS1085/-1.5/-2.5/- I = 10 mA , 1.5V≤ (V - V ) ≤ 12V 0.3 10 mV LOAD IN OUT 2.85/ -3.0/-3.3/-3.5/-5.0 0.6 10 mV Load Regulation AMS1085 0.1 0.3 % (V - V ) =3V, 10mA ≤ I ≤ 3A IN OUT OUT 0.2 0.4 % (Notes 2, 3) AMS1085-1.5 3 12 mV V = 5V, 0 ≤ I ≤ 3A IN OUT 6 20 mV AMS1085-2.5 V = 5V, 0 ≤ I ≤ 3A 3 12 mV IN OUT 6 20 mV AMS1085-2.85 V = 5V, 0 ≤ I ≤ 3A 3 12 mV IN OUT mV 6 20 AMS1085-3.0 3 12 mV V = 5V, 0 ≤ I ≤ 3A IN OUT 6 20 mV AMS1085-3.3 V = 5V, 0 ≤ I ≤ 3A 3 15 mV IN OUT 7 25 mV AMS1085-3.5 V = 5.25V, 0 ≤ I ≤ 3A 3 15 mV IN OUT mV 6 25 AMS1085-5.0 5 20 mV V = 8V, 0 ≤ I ≤ 3A IN OUT 10 35 mV Dropout Voltage AMS1085/-1.5/-2.5/- V ΔV , ΔV = 1%, I = 3 A (Note 4) 1.2 1.3 OUT REF OUT 2.85/ -3.0/-3.3/-3.5/-5.0 (V - V ) IN OUT Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS1085 ELECTRICAL CHARACTERISTICS Electrical Characteristics at I = 0 mA, and T = +25°C unless otherwise specified. OUT J Parameter Device Conditions Min Typ Max Units Current Limit AMS1085/-1.5/-2.5/- (V - V ) = 5V 3.00 3.50 4.00 A IN OUT 2.85/ -3.0/-3.3/-3.5/-5.0 Minimum Load AMS1085 (V - V ) = 12V (Note 5) 5 10 mA IN OUT Current Quiescent Current AMS1085/-1.5/-2.5/- V ≤ 12V 5 10 mA IN 2.85/ -3.0/-3.3/-3.5/-5.0 Ripple Rejection AMS1085 60 75 dB f =120Hz , C = 25μF Tantalum, I = 3A, OUT OUT (V -V ) = 3V, C =25μF IN OUT ADJ AMS1085-1.5 f =120Hz , C = 25μF Tantalum, I = 3A, 60 72 dB OUT OUT V = 4.5V IN AMS1085-2.5 f =120Hz , C = 25μF Tantalum, I = 3A, 60 72 dB OUT OUT V = 5.5V IN AMS1085-2.85 60 72 dB f =120Hz , C = 25μF Tantalum, I = 3A, OUT OUT V = 6V IN AMS1085-3.0 60 72 dB f =120Hz , C = 25μF Tantalum, I = 3A OUT OUT V = 6V IN AMS1085-3.3 60 72 dB f =120Hz , COUT = 25μF Tantalum, IOUT = 3A V = 6.3V IN AMS1085-3.5 f =120Hz , C = 25μF Tantalum, I = 3A 60 72 dB OUT OUT V = 6.5V IN AMS1085-5.0 f =120Hz , C = 25μF Tantalum, I = 3A 60 68 dB OUT OUT V = 8V IN Thermal Regulation AMS1085 T = 25°C, 30ms pulse 0.008 0.04 %W A Adjust Pin Current AMS1085 55 10mA ≤ I ≤ 3A , 1.5V≤ (V - V ) ≤ 12V μA OUT IN OUT 120 μA Adjust Pin Current AMS1085 0.2 5 10mA ≤ I ≤ 3A , 1.5V≤ (V - V ) ≤12V μA OUT IN OUT Change Temperature Stability 0.5 % Long Term Stability T =125°C, 1000Hrs 0.3 1 % A RMS Output Noise 0.003 % T = 25°C , 10Hz ≤ f ≤ 10kHz A (% of V ) OUT Thermal Resistance M/D Package: Control Circuitry/ Power Transistor 1.5/4.0 °C/W Junction-to-Case 1.5/4.0 °C/W T Package: Control Circuitry/ Power Transistor Parameters identified with boldface type apply over the full operating temperature range. Note 1: 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: Line and Load regulation are guaranteed up to 15W power dissipation for M and T packages and 2.2W for D package. Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. Note 3: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead ~1/8” from the package. Note 4: Dropout voltage is specified over the full output current range of the device. Note 5: Minimum load current is defined as the minimum output current required to maintain regulation. When (V - V ) = 12V the device is guaranteed IN OUT to regulate if the output current is greater than 10mA. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS1085 APPLICATION HINTS The AMS1085 series of adjustable and fixed regulators are easy to D1 use and have all the protection features expected in high performance voltage regulators: short circuit protection and thermal shutdown. Pin compatible with older three terminal adjustable regulators, AMS1085 V these devices offer the advantage of a lower dropout voltage, more V OUT IN OUT IN precise reference tolerance and improved reference stability with + C ADJ R OUT 1 temperature. 150μF Stability C ADJ R 2 10μF The circuit design used in the AMS1085 series requires the use of an output capacitor as part of the device frequency compensation. The addition of 150μF aluminum electrolytic or a 22μF solid tantalum on the output will ensure stability for all operating conditions. Overload Recovery When the adjustment terminal is bypassed to improve the ripple rejection, the requirement for an output capacitor increases. The When the power is first turned on, as the input voltage rises, the output follows the input, permitting the regulator to start up into value of 22μF tantalum or 150μF aluminum covers all cases of heavy loads. During the start-up, as the input voltage is rising, the bypassing the adjustment terminal. Without bypassing the input-to-output voltage differential remains small, allowing the adjustment terminal smaller capacitors can be used with equally regulator to supply large output currents. A problem can occur good results. with a heavy output load when the input voltage is high and the To ensure good transient response with heavy load current changes output voltage is low, when the removal of an output short will capacitor values on the order of 100μF are used in the output of not permit the output voltage to recover. The load line for such a many regulators. To further improve stability and transient load may intersect two points on the output current curve. In this response of these devices larger values of output capacitor can be case, there are two stable output operating points for the regulator. used. With this double intersection, the power supply may need to be cycled down to zero and brought up again to make the output Protection Diodes recover. Unlike older regulators, the AMS1085 family does not need any Ripple Rejection protection diodes between the adjustment pin and the output and from the output to the input to prevent over-stressing the die. The ripple rejection values are measured with the adjustment pin Internal resistors are limiting the internal current paths on the AMS1085 adjustment pin, therefore even with capacitors on the bypassed. The impedance of the adjust pin capacitor at the ripple adjustment pin no protection diode is needed to ensure device frequency should be less than the value of R1 (normally 100Ω safety under short-circuit conditions. to120Ω) for a proper bypassing and ripple rejection approaching Diodes between the input and output are not usually needed. the values shown. The size of the required adjust pin capacitor is a Microsecond surge currents of 50A to 100A can be handled by the function of the input ripple frequency. If R1=100Ω at 120Hz the internal diode between the input and output pins of the device. In adjust pin capacitor should be 25μF. At 10kHz only 0.22μF is normal operations it is difficult to get those values of surge needed. currents even with the use of large output capacitances. If high value output capacitors are used, such as 1000μF to 5000μF and The ripple rejection will be a function of output voltage, in circuits the input pin is instantaneously shorted to ground, damage can without an adjust pin bypass capacitor. The output ripple will occur. A diode from output to input is recommended, when a increase directly as a ratio of the output voltage to the reference crowbar circuit at the input of the AMS1085 is used. Normal voltage (V / V ). OUT REF power supply cycling or even plugging and unplugging in the system will not generate current large enough to do any damage. Output Voltage The adjustment pin can be driven on a transient basis ±25V, with respect to the output without any device degradation. As with any The AMS1085 series develops a 1.25V reference voltage between IC regulator, none the protection circuitry will be functional and the output and the adjust terminal. Placing a resistor between these the internal transistors will break down if the maximum input to two terminals causes a constant current to flow through R1 and output voltage differential is exceeded. down through R2 to set the overall output voltage. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS1085 APPLICATION HINTS This current is normally the specified minimum load current of Connected as shown, R not multiplied by the divider ratio. P is 10mA. Because I is very small and constant it represents a small ADJ Using 16-gauge wire the parasitic line resistance is about 0.004Ω error and it can usually be ignored. per foot, translating to 4mV/ft at 1A load current. It is important to keep the positive lead between regulator and load as short as possible and use large wire or PC board traces. AMS1085 V V IN OUT OUT Thermal Considerations IN ADJ V R1 REF The AMS1085 series have internal power and thermal limiting I ADJ circuitry designed to protect the device under overload conditions. 50μA R2 However maximum junction temperature ratings should not be exceeded under continuous normal load conditions. Careful consideration must be given to all sources of thermal resistance V = V (1+ R2/R1)+I R2 OUT REF ADJ from junction to ambient, including junction-to-case, case-to-heat sink interface and heat sink resistance itself. To ensure safe Figure 1. Basic Adjustable Regulator operating temperatures and reflect more accurately the device temperature, new thermal resistance specifications have been developed. Unlike older regulators with a single junction-to-case Load Regulation thermal resistance specification, the data section for these new regulators provides a separate thermal resistance and maximum True remote load sensing it is not possible to provide, because the junction temperature for both the Control Section and the Power AMS1085 is a three terminal device. The resistance of the wire Transistor. Calculations for both temperatures under certain connecting the regulator to the load will limit the load regulation. conditions of ambient temperature and heat sink resistance and to The data sheet specification for load regulation is measured at the ensure that both thermal limits are met. bottom of the package. Negative side sensing is a true Kelvin connection, with the bottom of the output divider returned to the Junction-to-case thermal resistance is specified from the IC negative side of the load. junction to the bottom of the case directly below the die. This is The best load regulation is obtained when the top of the resistor the lowest resistance path for the heat flow. In order to ensure the divider R1 is connected directly to the case not to the load. If R1 best possible thermal flow from this area of the package to the were connected to the load, the effective resistance between the heat sink proper mounting is required. Thermal compound at the regulator and the load would be: case-to-heat sink interface is recommended. A thermally conductive spacer can be used, if the case of the device must be R x ( R2+R1 ) , R = Parasitic Line Resistance P P electrically isolated, but its added contribution to thermal R1 resistance has to be considered. R P PARASITIC LINE RESISTANCE AMS1085 2.50 V IN OUT IN 2.125 ADJ 2.0 Θja=50ºC/W 1.75 R R1* L 1.5 Θja=60ºC/W 1.25 1.0 R2* 0.75 Θja=90ºC/W 0.5 0.25 0.0 0 25 45 65 85 105 125 145 Ambient Temperature (ºC) *CONNECT R1 TO CASE TO-252 Power Dissipation Still Air 2Oz Cu on top Plane CONNECT R2 TO LOAD Figure 2. Connections for Best Load Regulation Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 Maximum Allowable Power Dissipation (W) AMS1085 TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage Load Regulation Temperature Stability 0.10 2.0 2 ΔI = 3A 0.05 T =-40° C J T =-20° C 1.0 J 0 1 -0.05 0 T =25° C J -0.10 T =150° C -1.0 J -0.15 0 -0.20 -2.0 0 1 2 3 4 -50 -25 0 25 50 75 100 125 150 -25 0 25 50 75 100 125 150 -50 TEMPERATURE (° C) OUTPUT CURRENT (A) TEMPERATURE (° C) Ripple Rejection Ripple Rejection vs. Current Short-Circuit Current 80 6 100 V ≤ 3V V ≤ 0.5V RIPPLE P-P RIPPLE P-P 90 70 5 80 f = 120Hz R 60 V ≤ 3V 70 RIPPLE P-P (V -V ) IN OUT 4 50 ≥ 3V 60 f =20kHz R 50 40 3 V ≤ 0.5V RIPPLE P-P (V -V )≥V IN OUT DROPOUT 40 30 2 30 20 20 I =I OUT FULL LOAD 1 10 10 0 0 0 100 1k 10k 100k 0 0.2 0.4 0.6 0.8 1.0 0 2 4 6 8 10 12 14 FREQUENCY (Hz) OUTPUT CURRENT (0 TO I ) INPUT/OUTPUT DIFFERENTIAL (V) FULL LOAD Load Transient Response Line Transient Response Maximum Power Dissipation* 50 0.3 60 40 CADJ = 0 0.2 C = 0 ADJ 0.1 20 40 0 0 -0.1 -20 30 C = 1μF IN C = 10μF OUT -40 -0.2 V = 10V OUT TANTALUM I = 0.2A IN 20 -0.3 -60 CIN = 1μF TANTALUM ~ ~ ~ ~ ~ ~ ~ ~ C = 10μF OUT 3 VOUT = 10V 14 TANTALUM V = 13V IN 2 10 13 PRELOAD = 100mA 1 12 0 0 0 50 0 100 200 50 60 70 80 90 100 110 120 130 140 150 100 TIME (μs) TIME (μs) CASE TEMPERATURE (° C) *AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 LOAD OUTPUT VOLTAGE MINIMUM INPUT/OUTPUT RIPPLE REJECTION (dB) CURRENT (A) DEVIATION (V) DIFFERENTIAL (V) INPUT OUTPUT VOLTAGE OUTPUT VOLTAGE DEVIATION (%) DEVIATION (V) DEVIATION (mV) RIPPLE REJECTION (dB) OUTPUT VOLTAGE CHANGE (%) POWER (W) SHORT-CIRCUIT CURRENT (A) AMS1085 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Minimum Operating Current Adjust Pin Current (Adjustable only) (Adjustable only) 100 10 9 90 80 8 T = 150° C J 7 70 6 60 T = 25° C J 5 50 4 40 30 3 20 2 10 1 0 0 0 2 4 6 8 10 12 14 -50 -25 0 25 50 75 100 125 150 INPUT/OUTPUT DIFFERENTIAL (V) TEMPERATURE (° C) PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 3 LEAD TO-220 PLASTIC PACKAGE (T) 0.147-0.155 0.165-0.180 0.390-0.415 (3.734-3.937) (4.191-4.572) (9.906-10.541) 0.045-0.055 DIA (1.143-1.397) 0.230-0.270 (5.842-6.858) 0.570-0.620 (14.478-15.748) 0.460-0.500 0.330-0.370 (11.684-12.700) (8.382-9.398) 0.980-1.070 (24.892-27.178) 0.218-0.252 (5.537-6.401) 0.520-0.570 (13.208-14.478) 0.090-0.110 0.050 (2.286-2.794) 0.013-0.023 (1.270) (0.330-0.584) 0.095-0.115 TYP 0.028-0.038 (2.413-2.921) (0.711-0.965) T (TO-220) AMS DRW# 042193 Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 MINIMUM OPERATING CURRENT (mA) ADJUST PIN CURRENT ( μA) AMS1085 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). 3 LEAD TO-263 PLASTIC DD (M) 0.060 0.165-0.180 (4.191-4.572) (1.524) 0.390-0.415 0.045-0.055 (9.906-10.541) TYP (1.143-1.397) +0.008 0.004 0.330-0.370 -0.004 (8.382-9.398) +0.203 (0.102 ) -0.102 0.095-0.115 0.108 (2.413-2.921) (2.74) 0.199-0.218 TYP (5.05-5.54) 0.90-0.110 (2.29-2.79) 0.090-0.110 0.032 (2.286-2.794) 0.013-0.023 (0.81) (0.330-0.584) M (DD3) AMS DRW# 042191R1 TYP 2 LEAD TO-263 PLASTIC DD (M) Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS1085 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). TO-252 PLASTIC PACKAGE (D) 0.255-0.265 (6.48-6.73) 0.087-0.094 0.206-0.214 (2.21-2.39) (5.23-5.44) 0.018-0.023 (0.46-0.58) 0.035-0.050 (0.89-1.27) 7.0° 0.235-0.245 (5.969-6.223) 0.380-0.410 (9.65-10.41) 0.045-0.060 0.035-0.045 (1.14-1.52) (0.89-1.14) 0.025 (0.635) 0.020±0.002 TYP (0.510±0.0508) 0.030 0.018-0.023 0.156-0.204 (0.762) (0.46-0.58) D (D3) AMS DRW# 011601 (3.96-5.18) TYP Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723