Advanced Monolithic Systems AMS2931 100mA LOW DROPOUT VOLTAGE REGULATOR RoHS compliant FEATURES APPLICATIONS • Fixed and Ajustable Versions Available • Output Current in excess of 100mA • Very Low Quiescent Current • Reverse Battery Protection • Input-output Differential less than 0.6V • Short Circuit protection • Internal Thermal Overload Protection • 60V Load Dump Protection • -50V Reverse Transient Protection • Mirror Image Insertion Protection • Battery Powered Systems • Portable Consumer Equipment • Cordless Telephones • Portable (Notebook) Computers • Portable Instrumentation • Radio Control Systems • Automotive Electronics GENERAL DESCRIPTION The AMS2931 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 1mA or less when supplying 10mA loads. This unique characteristic and the extremely low input -output differential required for proper regulation (0.2V for output currents of 10mA) make the AMS2931 ideal to use for standby power systems. Originally designed for automotive applications, the AMS2931 and all regulated circuitry are protected from input fault conditions caused by reverse battery installation or two battery jump starts. During line transients, such as load dump (60V) 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 AMS2931 series also includes internal current limiting, thermal shutdown, and is able to withstand temporary power-up with mirror-image insertion. The AMS2931 is offered in the 3-pin TO-92 package, 8-pin plastic SOIC, TO-220 and TO-263 packages. ORDERING INFORMATION OUTPUT PACKAGE TYPE 8 LEAD SOIC TO-220 AMS2931AS-X AMS2931AT-X AMS2931S-X AMS2931T-X ADJ. AMS2931CS X = 2.0V, 2.5V, 3.0V, 3.3V, 3.5V, 4.0V, 5.0V *For additional available fixed voltages contact factory VOLTAGE FIXED* TO-92 AMS2931AN-X AMS2931N-X www.advanced-monolithic.com OPER. TEMP TO-263 AMS2931AM-X AMS2931M-X RANGE -40ºC to +85ºc -40ºC to +85ºc -40ºC to +85ºc updated April 24, 2009 AMS2931 ABSOLUTE MAXIMUM RATINGS (Note 1) Overvoltage Protection AMS2931A-X, AMS2931C AMS2931-X Maximum Input Voltage Internal Power Dissipation (Note 4) Storage Temperature 60V 50V 22V Internally Limited -65°C to +150°C OPERATING CONDITIONS (Note1) Input voltage range Junction Temperature Lead Temperature (Soldering 25 sec) ESD 4V to 22V +125°C 265°C 2000V ELECTRICAL CHARACTERISTICS Electrical Characteristics at VIN =14V, IO =10mA, TJ=25°C, C2 = 100µF unless otherwise specified. PARAMETER CONDITIONS Min. AMS2931A-X Typ. Max. Min. AMS2931-X Typ. Max. Units Fixed Output voltage Versions Output Voltage 6V ≤VIN ≤26V, IO=100 mA -1.0 +1.0 - 3.0 + 3.0 -3.0 +3.0 % ± 5.0 -40°C ≤TJ ≤125°C % 9V ≤VIN ≤ 16V 2 10 2 10 mV 6V ≤VIN ≤ 26V 4 30 4 30 mV Load Regulation 5mA ≤IO ≤ 100 mA 14 50 14 50 mV Dropout Voltage IO = 10 mA 50 200 50 200 mV IO = 100 mA 300 600 300 600 mV IO ≤ 10 mA, 6V ≤ VIN ≤ 26V 0.4 1.0 0.4 1.0 mA 15 30 15 Line Regulation Quiescent Current -40°C ≤TJ ≤ 125°C IO = 100 mA, VIN = 14V, TJ = 25°C 5 500 mA 500 Output Noise Voltage 10Hz-100kHz, COUT = 100µA Output Impedance 100mADC and 10mArms,100Hz=10kHz Long Term Stability T =1000hr Ripple Rejection fO =120Hz 55 80 Maximum Line Transient RL = 500Ω, VO ≤ 5.5V 60 70 50 -15 -30 -50 -80 200 µV rms 200 20 mΩ 20 mV 80 dB 70 V -15 -30 V -50 -80 V T = 1ms, τ ≤100ms Reverse Polarity Input Voltage, D/C Reverse Polarity Input Voltage, Transient RL = 500Ω, T = 1ms, τ ≤100ms www.advanced-monolithic.com updated April 24, 2009 AMS2931 ELECTRICAL CHARACTERISTICS Electrical Characteristics at VIN =14V, VOUT =3V IO =10mA, TJ=25°C, R1 =27k, C2 = 100µF unless otherwise specified. PARAMETER Min. AMS2931C Typ. Max. 1.14 1.20 1.26 V 1.32 V CONDITIONS (Note 2) Units Adjustable Version Reference Voltage IO ≤ 100 mA, -40°C ≤TJ ≤ 125°C, R1=27k, Measured from VOUT to Adjust Pin Output Voltage Range 1.08 3 24 V Line Regulation VOUT + 0.6V ≤VIN ≤ 26V .02 1.5 Load Regulation 5mA ≤IO ≤ 100 mA 0.3 1 % Dropout Voltage IO ≤ 10 mA 0.05 0.3 0.2 0.6 V V 1 During Shutdown RL = 500Ω 0.4 15 0.8 Output Noise Voltage 10Hz-100kHz 100 µVrms/V Output Impedance 100mADC and 10mArms,100Hz=10kHz 40 mΩ %/1000hr IO = 100 mA Quiescent Current IO = 10 mA IO = 100 mA Long Term Stability T =1000hr 0.4 Ripple Rejection fO = 120Hz 0.02 Maximum Operating Input Voltage Maximum Line Transient 21 IO = 10mA, Reference Voltage ≤ 1.5V 1 mV/V mA mA mA %/V 22 V 60 70 V T = 1ms, τ ≤100ms Reverse Polarity Input Voltage, D/C RL = 500Ω, VO ≥ -0.3V -15 -30 V Reverse Polarity Input Voltage, Transient RL = 500Ω, T = 1ms, τ ≤100ms -50 -80 V On/Off Threshold Voltage VO = 3V On Off On/Off Threshold Current 2.0 3.25 1.2 2.2 20 V V 50 µA 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: See Circuit in Typical Applications. 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 = 25°C. Note 4: The junction-to-ambient thermal resistance are as follows: 195°C/W for the TO-92 (N) package, 160°C/W for the molded plastic SO-8 (S), 50°C/W for the TO-220 package and 73°C/W for the TO-263 package. If the TO-220 package is used with a heat sink, θJA is the sum of the package thermal resistance junction-to-case of 3°C/W and the thermal resistance added by the heat sink and the thermal interface. The thermal resistance of the TO-263 package can be reduced by increasing the PCB copper area thermally connected to the package: using 0.5 square inches of copper area, ϕ JA is 50°C/W; with 1 square inch of copper area ϕ JA is 37°C/W; and with 1.6 or more square inches of copper area ϕ JA is 32°C/W. www.advanced-monolithic.com updated April 24, 2009 AMS2931 PIN CONNECTIONS FIXED OUTPUT VOLTAGE OUTPUT 8L SOIC SO-Package (S) INPUT OUTPUT 1 7 GROUND GROUND 3 6 GROUND N/C 4 Bottom View TO-263 (M) TAB IS GND OUTPUT GND INPUT 8 INPUT GROUND 2 GND TO-220 (T) GND TO-92 Plastic Package (N) OUTPUT GND INPUT 5 N/C Top View Front View Top View ADJUSTABLE OUTPUT VOLTAGE 8L SOIC SO-Package (S) OUTPUT 1 8 INPUT GROUND 2 7 GROUND GROUND 3 6 GROUND ADJ 4 5 ON/OFF Top View TYPICAL APPLICATIONS AMS2931-X (Fixed Output) AMS2931C (Adjustable Output) VCC VIN UNREGULATED INPUT C1* 0.1µF AMS2931 GND IQ VOUT REGULATED OUTPUT R3 51k C2** 100µF OUT ON/OFF C1* 0.1µF AMS2931 ADJUSTABLE R1 28k + ADJ ON *Required if regulator is located far from power supply filter. **C2 must be at least 100µF to maintain stability; it can be increased without bound to maintain regulation during transients and it should be located as close as possible to the regulator. This capacitor must be rated over the same operating temperature range like the regulator. The ESR of this capacitor is critical (see curve). VOUT OFF GND C2** 100µF R2 VOUT = VREF × ( R1+R2)/R1 Note: Using 27k for R1 will automatically compensate for errors in VOUT due to the input bias current of the Adjust Pin ( approx. 1µA) www.advanced-monolithic.com updated April 24, 2009 AMS2931 TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage IO = 100mA 0.3 IO = 50mA 0.2 IO = 10mA 0.1 0 0 0.5 5.0 0.4 0.3 0.2 0.1 6 4 2 0 0 10 20 30 40 50 INPUT VOLTAGE (V) 60 INPUT VOLTAGE OUTPUT VOLTAGE CHANGE (V) DEVIATION (mV) 3 2 1 0 -1 -2 ~ -3 ~ VIN = VOUT = 9V C2= 100 µF ~ ~ 3 0 0 Peak Output Current 15 30 TIME (µs) 2.0 45 QUIESCENT CURRENT (mA) TJ= 25°C 400 TJ = 85°C 300 TJ = -40°C 200 100 0 C2= 100µF 0 -40 ~ ~ 20 10 INPUT VOLTAGE (V) www.advanced-monolithic.com 30 ~ ~ 150 0 0 15 30 TIME (µs) 45 25 VIN = 14V 25 20 15 10 5 0 0 40 Quiescent Current 30 500 3.0 4.0 5.0 6.0 INPUT VOLTAGE (V) Load Transient Response Quiescent Current 600 OUTPUT CURRENT ( mA) 100 0 60 30 90 OUTPUT CURRENT (mA) QUIESCENT CURRENT (mA) OUTPUT VOLTAGE (V) 8 -2 -20 -10 50 OUTPUT CURRENT (mA) Line Transient Response AMS2931-5.0 RL=500Ω 10 2.0 0 0 Output at Voltage Extremes 12 3.0 0 80 40 120 JUNCTION TEMPERATURE (° C) AMS2931-5.0 IO = 100mA 4.0 OUTPUT VOLTAGE DEVIATION (mV) 0.4 6.0 OUTPUT VOLTAGE (V) 0.5 Low Voltage Behavior 0.6 LOAD CURRENT(mA) INPUT OUTPUT DIFFERENTIAL (V) INPUT OUTPUT DIFFERENTIAL (V) Dropout Voltage 0.6 20 15 10 3 ~ ~ ~ ~ IO = 50mA 2 1 IO = 0mA 0 -40 0 40 80 120 TEMPERATURE (° C) updated April 24, 2009 AMS2931 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Quiescent Current Ripple Rejection IO= 100mA 15 10 IO= 50mA 5 C2 = 100µF TANTALUM 80 25 20 85 0 75 C2 = 100µF ALUM 70 65 60 55 AMS2931-5.0 IO= 10mA 50 75 70 65 60 55 FQ= 120Hz 50 IO= 10mA 45 60 1 Output Impedance OUTPUT VOLTAGE (V) 1 0.1 10 100 1k 10k 100k FREQUENCY (Hz) 1M 0 ~ ~ 0.7 0.6 0.5 0.4 0.3 0.2 ~ ~ CO= 100µF RL= 500Ω 0 100 200 300 TIME (ms) 400 0 10 20 30 40 50 60 70 80 90 AMBIENT TEMPERATURE (° C) 1.24 1.22 1.20 1.18 1.16 1.14 1.12 1.10 0 NO HEAT SINK 3 6 9 12 15 18 21 OUTPUT VOLTAGE (V) 0.8 0.7 0.125" Lead Lenght from PC Board 0.6 0.5 0.4 0.4" Lead Lenght from PC Board 0.3 0.2 0.1 0 0 10 20 30 40 50 60 70 80 90 100 AMBIENT TEMPERATURE (° C) 24 Maximum Power Dissipation (TO-92) 1.0 0.9 INFINITE HEAT SINK 2 0 0.1 0 1.26 500 10° C/W HEAT SINK AMS2931C ADJUSTABLE 1.28 Maximum Power Dissipation (TO-220) POWER DISSIPATION (W) 0.8 100 Reference Voltage τ =150ms 6 4 2 0 -2 -100 22 20 18 16 14 12 10 8 6 4 25 50 75 OUTPUT CURRENT (mA) 1.30 70 60 50 40 30 20 10 0 Maximum Power Dissipation (SO-8) 1.0 0.9 www.advanced-monolithic.com 45 1M REFERENCE VOLTAGE (V) INPUT VOLTAGE (V) IO = 10mA 1 100 1k 10k 100k FREQUENCY (Hz) Operation During Load Dump AMS2931-5.0 0.01 10 POWER DISSIPATION (W) 0 10 20 30 40 50 INPUT VOLTAGE (V) 10 OUTPUT IMPEDANCE (Ω) 5V OUTPUT 80 RIPPLE REJECTION (dB) 5V OUTPUT 30 -5 -20 -10 POWER DISSIPATION (W) Ripple Rejection 85 RIPPLE REJECTION (dB) QUIESCENT CURRENT ( mA) 35 0 10 20 30 40 50 60 70 80 AMBIENT TEMPERATURE (° C) updated April 24, 2009 AMS2931 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) 3 θJA = 37° C/W 2 θJA = 50° C/W 1 θJA = 73° C/W 0 0 10 20 30 40 50 60 70 80 90 100 AMBIENT TEMPERATURE (° C) 4.0 3.8 AMS2931C ADJUSTABLE 3.6 3.4 OFF 3.2 3.0 2.8 2.6 ON 2.4 2.2 2.0 0 3 6 9 12 15 18 21 OUTPUT VOLTAGE (V) 24 EQUIVALENT SERIES RESISTANCE (Ω) 4 θJA = 32° C/W Output Capacitor ESR On/Off Treshold ON/OFF VOLTAGE TRESHOLDS (V) POWER DISSIPATION (W) Maximum Power Dissipation (TO-263) 100 COUT= 100µF VO = 5V 10 1 STABLE REGION 0.1 0.01 0 20 40 60 80 OUTPUT CURRENT (mA) 100 APPLICATION HINTS The AMS2931 series require an output capacitor for device stability. The value required depends on the application circuit and other factors. Because high frequency characteristics of electrolytic capacitors depend greatly on the type and even the manufacturer, the value of capacitance that works well with AMS2931 for one brand or type may not necessary be sufficient with an electrolytic of different origin. Sometimes actual bench testing will be the only means to determine the proper capacitor type and value. To obtain stability in all general applications a high quality 100µF aluminum electrolytic or a 47µF tantalum electrolytic can be used. A critical characteristic of the electrolytic capacitors is their performance over temperature. The AMS2931 is designed to operate to -40°C, but some electrolytics will freeze around -30°C therefore becoming ineffective. In such case the result is oscillation at the regulator output. For all application circuits where cold operation is necessary, the output capacitor must be rated to operate at the minimum temperature. In applications where the regulator junction temperature will never be lower than 25°C the output capacitor value can be reduced by a factor of two over the value required for the entire temperature range (47µF for a high quality aluminum or 22µF for a tantalum electrolytic capacitor). www.advanced-monolithic.com With higher output currents, the stability of AMS2931 decreases. Considering the fact that in many applications the AMS2931 is operated at only a few milliamps (or less) of output current, the output capacitor value can be reduced even further. For example, a circuit that is required to deliver a maximum of 10mA of output current from the regulator output will need an output capacitor of only half the value compared to the same regulator required to deliver the full output current of 100mA. In the case of AMS2931C (adjustable), the minimum value of output capacitance is a function of the output voltage. As a general rule, with higher output voltages the value of the output capacitance decreases, since the internal loop gain is reduced. In order to determine the minimum value of the output capacitor, for an application circuit, the entire circuit including the capacitor should be bench tested at minimum operating temperatures and maximum operating currents. To maintain internal power dissipation and die heating to a minimum, the input voltage should be maintain at 0.6V above the output. Worst-case occurs just after input power is applied and before the die had the chance to heat up. After the minimum capacitance value has been found for the specific brand and type of electrolytic capacitor, the value should be doubled for actual use to cover for production variations both in the regulator and the capacitor. updated April 24, 2009 AMS2931 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 www.advanced-monolithic.com updated April 24, 2009 AMS2931 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). 3 LEAD TO-220 PLASTIC PACKAGE (T) 0.147-0.155 (3.734-3.937) DIA 0.390-0.415 (9.906-10.541) 0.165-0.180 (4.191-4.572) 0.045-0.055 (1.143-1.397) 0.230-0.270 (5.842-6.858) 0.570-0.620 (14.478-15.748) 0.460-0.500 (11.684-12.700) 0.330-0.370 (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 (2.286-2.794) 0.050 (1.270) TYP 0.028-0.038 (0.711-0.965) 0.013-0.023 (0.330-0.584) 0.095-0.115 (2.413-2.921) T (TO-220) AMS DRW# 042193 3 LEAD TO-263 PLASTIC DD (M) 0.060 (1.524) TYP 0.390-0.415 (9.906-10.541) 0.165-0.180 (4.191-4.572) 0.004 +0.008 -0.004 (0.102 +0.203 ) -0.102 0.330-0.370 (8.382-9.398) 0.199-0.218 (5.05-5.54) 0.090-0.110 (2.286-2.794) www.advanced-monolithic.com 0.032 (0.81) TYP 0.045-0.055 (1.143-1.397) 0.108 (2.74) TYP 0.013-0.023 (0.330-0.584) 0.095-0.115 (2.413-2.921) 0.90-0.110 (2.29-2.79) M (DD3) AMS DRW# 042191R1 updated April 24, 2009