SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown FEATURES 8 +VIN ■ Output 3.3V, 5.0V, at 400mA Output +VIN VOUT 100K ■ Very Low Quiescent Current SPX2920 ■ Low Dropout Voltage SHUTDOWN INPUT ■ Extremely Tight Load and Line Regulation 3 SD GND OFF 4 ON ■ Very Low Temperature Coefficient ■ Current & Thermal Limiting FB ______ ERROR 1.2V to 20V 1 + 7 R1 0.01µF 10µF ERROR 5 VREF OUTPUT R2 Adjustable Regulator ■ Error Flag Warns of Output Dropout (for SO-8) 5V VIN OUT IN ■ Logic-Controlled Electronic Shutdown (for SO-8) SPX2920 ■ Output Programmable from 1.24V to 20V (for SO-8) ■ Equivalent Replacement for MIC2920A and MIC2904 + + 0.1 µF GND 2.2 µF IG 5V Regulator Circuit Now Available in Lead Free Packaging DESCRIPTION The SPX2920 is a low power voltage regulator. This device is an excellent choice for use in batterypowered applications such as cordless telephones, radio control systems, and portable computers. The SPX2920 features very low quiescent current (140µA Typical) and very low dropout voltage. This includes a tight initial tolerance of 1% maximum and very low output temperature coefficient, making the SPX2920 useful as a low-power voltage reference. The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling voltage input from batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX2920 is offered in 3-pin TO-220 package, surface mount SO-8 (same pin out as SPX2951), SOT-223, and 3-pin TO-263 packages. The regulator output voltage (of the SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed from 1.24V to 20V with an external pair of resistors. TO-263-3 (T) TO-220-3 (U) 8-Pin Surface Mount SOT-223 (M3) GND GND GND SPX2920 SPX2920 1 2 1 2 3 3 VIN GND VOUT 1 SENSE 2 SHUTDOWN 3 GND 4 SPX2920 8 VIN 7 FEEDBACK 6 5 SPX2920 1 2 3 5V/ 3.3V TAP ERROR VIN GND VOUT VOUT VIN GND VOUT Front View Date: 03/02/06 Top View Top View Top View SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 1 ©Copyright 2006 Sipex Corporation ABSOLUTE MAXIMUM RATINGS Feedback Input Voltage ..................................................... -1.5V to +20V Shutdown Input Voltage .................................................... -0.3V to +20V Error Comparator Output ................................................... -0.3V to +20V ESD Rating ........................................................................................ 2kV Power Dissipation ........................................................ Internally Limited Lead Temp. (Soldering, 5 Seconds) .............................................. 260°C Storage Temperature Range ......................................... -65°C to +150°C Operating Junction Temperature Range ...................... -40°C to +125°C Input Supply Voltage ......................................................... -20V to +20V ELECTRICAL CHARACTERISTICS Electrical characteristics at VIN =VO +1V, IO = 1mA, COUT = 2.2µF, TA = 25°C, unless otherwise specified. Boldface applies over the full operating temperature range. PARAMETER CONDITIONS (Note 2) TYP MIN MAX UNITS 3.3 3.3 3.267 3.217 3.333 3.382 V 1mA ≤ IL ≤ 400mA 5.0 5.0 4.950 4.880 5.050 5.120 V 1mA ≤ IL ≤ 400mA 3.3V Version Output Voltage 5.0V Version Output Voltage All Voltage Options Output Voltage Temperature Coefficient Line Regulation (Note 4) Load Regulation (Note 3) Dropout Voltage (Note5) Ground Current Current Limit Thermal Regulation Output Noise, 10Hz to 100kHz IL=100mA Adjustable 8-Pin Version only Reference Voltage Reference Voltage Feedback Pin Bias Current 20 100 ppm/°C (Note1) 6V ≤ VIN ≤ 20V IL=1 to 400mA 1.5 5 mV mV IL=1mA 60 IL=400mA 370 IL=1mA 140 IL=100mA 1.3 IL=250mA 3.4 20 20 30 100 150 400 500 200 300 2 2.5 9 IL=400mA 6 VOUT=0 0.05 400 260 CL=10µF CL=100µF 1.235 Over Temperature 1.210 1.185 20 Reference Voltage Temperature Coefficient Date: 03/02/06 12 15 25 800 0.2 20 SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 2 1.260 1.285 40 60 mV µA mA mA mA mA %/W µV Vrms V V nA ppm/°C ©Copyright 2006 Sipex Corporation ELECTRICAL CHARACTERISTICS Electrical characteristics at VIN = VO+1V, IO = 1mA, COUT = 2.2µF, TA = 25°C, unless otherwise specified. Boldface applies over the full operating temperature range. PARAMETER CONDITIONS (Note 2) TYP Feedback Pin Bias Current Temperature Coefficient Error Comparator MIN MAX 0.1 Output Leakage Current V0UT=20V 0.01 Output Low Voltage 150 Upper Threshold Voltage VIN=4.5V IOUT=400µA (Note 6) Lower Threshold Voltage (Note 6) 75 Hysteresis Shutdown Input Input Logic Voltage (Note 6) 15 UNITS nA/°C 1 2 250 400 60 40 25 µA mV mV 95 140 mV mV 1.3 Low (Regulator ON) High (Regulator OFF) VS=2.4V 30 VS=20V 450 Regulator Output Current in Shutdown (Note 7) 3 Thermal Resistance Theta JA TO-220-3 TO-263-3 NSOIC-8 SOT-223 Shutdown Pin Input Current 0.7 V 50 100 600 750 µA 2.0 10 20 29.4 31.4 128.4 62.3 µA ºC/W Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. Note 2: Additional conditions for the 8-pin versions are feedback tied to 5V/3.3V tap and output tied to output sense (VOUT = 5V) and VSHUTDOWN ≤ 0.8V. Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 4: Line regulation for the SPX2920 is tested at 150°C for IL = 1 mA. For TJ = 125°C, line regulation is guaranteed by design. Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account. Note 6: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 7: VSHUTDOWN ≥ 2V, VIN ≤ 20V, VOUT = 0, Feedback pin tied to 5V/3.3V Tap. Date: 03/02/06 SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 3 ©Copyright 2006 Sipex Corporation BLOCK DIAGRAM UNREGULATED DC 7 + 5V @ 400mA MAX 1 8 2 + _ FROM TTL 3 180k Ω .. 6 ERROR AMPLIFIER 330k Ω .. 60kΩ .. + 60 mV 5 + _ + 1.23V ERROR DETECTION COMPARATOR + 1 uF TO CMOS OR TTL 4 REFERENCE SPX2920-5.0 Block Diagram APPLICATION HINTS External Capacitors The stability of the SPX2920 requires a 2.2µF or greater capacitor between output and ground. Oscillation could occur without this capacitor. Most types of tantalum or aluminum electrolytic capacitors work fine here. For operations of below -25°C, solid tantalum is recommended since many of the aluminum types have electrolytes that freeze at about -30°C. The ESR of about 5Ω or less and resonant frequency above 500kHz are the most important parameters in the value of the capacitor. The capacitor value can be increased without limit. 1.23V output. The SPX2920, unlike other low dropout regulators, will remain stable and in regulation with no load in addition to the internal voltage divider. This feature is especially important in applications like CMOS RAM keep-alive. If there is more than 10 inches of wire between the input and the AC filter capacitor, or if a battery is used as the input, then a 0.1µF tantalum or aluminum electrolytic capacitor should be placed from the input to the ground. At lower values of output current, less output capacitance is required for stability. For the currents below 10mA the value of the capacitor can be reduced to 0.5µF and 0.15µF for 1mA. More output capacitance is needed for the 8-pin version at voltages below 5V since it runs the error amplifier at lower gain. At worst case, 4.7µF or greater must be used for the condition of 250mA load at Date: 03/02/06 Instability can occur if there is stray capacitance to the SPX2920 feedback terminal (pin 7). This could cause more problems when using a higher value of external resistors to set the output voltage. This problem can be fixed by adding a 100pF capacitor between output and feedback and increasing the output capacitor to at least 3.3µF. SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 4 ©Copyright 2006 Sipex Corporation recommended load current of 1µA forces an upper limit of 1.2MΩ on the value of R2. If no load is presented, the IFB produces an error of typically 2% in VOUT, which may be eliminated at room temperature by trimming R1. To improve the accuracy choose the value of R2 = 100kΩ; this reduces the error by 0.17% and increases the resistor program current by 12µA. Since the SPX2920 typically draws 60µA at no load with Pin 2 open-circuited, this is a small price to pay. Error Detection Comparator Output The Comparator produces a logic low output whenever the SPX2920 output falls out of regulation by more than about 5%. This is around 60mV offset divided by the 1.235 reference voltage. This trip level remains 5% below normal regardless of the programmed output voltage of the regulator. Figure 1 shows the timing diagram depicting the ERROR signal and the regulator output voltage as the SPX2920 input is ramped up and down. The ERROR signal becomes low at around 1.3V input, and goes high around 5V input (input voltage at which VOUT = 4.75V). Since the SPX2920’s dropout voltage is load dependent, the input voltage trip point (around 5V) will vary with the load current. The output voltage trip point (approximately 4.75V) does not vary with load. Reducing Output Noise It may be an advantage to reduce the AC noise present at the output. One way is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only way that noise can be reduced on the 3 lead SPX2920 but it is relatively inefficient; as increasing the capacitor from 1µF to 220µF only decreases the noise from 430µV to 160µV Vrms for a 100kHz bandwidth at 5V output. The error comparator has an open-collector output, which requires an external pull-up resistor. Depending on the system requirements the resistor may be returned to 5V output or other supply voltage. In determining the value of this resistor, note that the output is rated to sink 400µA; this value adds to battery drain in a low battery condition. Suggested values range from 100K to 1MΩ. If the output is unused this resistor is not required. Noise could also be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick CBYPASS ≅1 / 2πR1 x 200 Hz or choose 0.01µF. When doing this, the output capacitor must be increased to 3.3µF to maintain stability. These changes reduce the output noise from 430µV to 100µV Vrms for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output Programming the Output Voltage of SPX2920 The SPX2920 may be pin-strapped for 5V or 3.3V using its internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V/3.3V Tap). 4.75V Also, it may be programmed for any output voltage between its 1.235V reference and its 20V maximum rating. As seen on the front page, an external pair of resistors is required. OUTPUT VOLTAGE _______ ERROR* Refer to the equation below for the programming of the output voltage: +5.0V INPUT VOLTAGE VOUT = VREF x ( 1 + R1/ R2 )+ IFBR1 + * See Application Info. The VREF is 1.235 and IFB is the feedback bias current, nominally -20nA. The minimum Date: 03/02/06 + +1.3V Figure 1. ERROR Output Timing SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 5 ©Copyright 2006 Sipex Corporation PACKAGE: 3 PIN TO-220 Thermal Pad E E2 øP Q (H1) D2 D D1 1 L1 FRONT VIEW BACK VIEW L e A Chamfer Optional A2 Date: 03/02/06 JEDEC TO-220 Dimensions in Inches: Controlling Dimension SYMBOL SIDE VIEW C E1 3 Pin TO-220 A1 H1 e1 b Seating Plane b2 MIN NOM A 0.140 A1 0.020 A2 0.080 b 0.015 0.027 b2 0.045 0.057 c 0.014 D 0.560 D1 0.330 D2 0.480 E 0.380 E1 0.270 E2 e .100 BSC e1 .200 BSC H1 0.230 L 0.500 L1 0.139 ΦP Q 0.100 SIPEX Pkg Signoff Date/Rev: MAX 0.190 0.055 0.115 0.040 0.070 0.024 0.650 0.355 0.507 0.420 0.350 0.030 0.270 0.580 0.250 0.161 0.135 SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 6 Variation AB Dimensions in Millimeters: Conversion Factor: 1 Inch = 25.40 mm MIN NOM MAX 3.56 4.83 0.51 1.27 2.03 2.79 0.25 0.51 1.02 1.14 1.45 1.78 0.25 0.51 14.22 16.51 8.38 8.89 12.19 12.70 9.65 10.67 6.86 8.89 0.76 2.54 BSC 5.08 BSC 5.84 6.86 12.70 14.73 6.35 3.30 4.06 2.54 3.30 JL Aug4-05 / Rev A ©Copyright 2006 Sipex Corporation PACKAGE: 3 PIN TO-263 E Seating Plane A E/2 C2 L1 SIDE VIEW D 1 2 H Chamfer Optional c 3 e See Detail C b b2 Gauge Plane FRONT VIEW Seating Plane θ L3 A1 L DETAIL C Thermal Pad 3 Pin TO-263 JEDEC TO-263 (L1) Inches Controlling Dimension SYMBOL D1 BACK VIEW E1 Date: 03/02/06 MIN NOM MAX A 0.160 0.190 0.010 A1 0.000 b 0.020 0.039 b2 0.045 0.070 c 0.015 0.029 0.065 c2 0.045 D 0.330 0.380 D1 0.270 E 0.380 0.420 E1 0.245 e .100 BSC H 0.575 0.625 L 0.070 0.110 L1 0.066 L3 .010 BSC O 0˚ 8˚ SIPEX Pkg Signoff Date/Rev: SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 7 Variation AA Millimeters Conversion Factor: 1 Inch = 25.40 mm MIN NOM MAX 4.06 4.83 0.00 0.25 0.51 0.99 1.14 1.78 0.38 0.74 1.14 1.65 8.38 9.65 6.86 9.65 10.67 6.22 2.54 BSC 14.61 15.88 1.78 2.79 1.68 0.25 BSC 0˚ 8˚ JL Aug5-05 / Rev A ©Copyright 2006 Sipex Corporation PACKAGE: 3 PIN SOT-223 D b2 E E1 3 2 1 e e1 TOP VIEW b Gauge Plane A A2 L2 ø L Seating Plane c A1 FRONT VIEW 3 Pin SOT-223 JEDEC TO-261 Inches Conversion Factor: 1 Inch = 25.40 mm Millimeters Controlling Dimension SYMBOL MIN NOM A A1 0.02 A2 1.50 1.60 b 0.66 0.76 b2 2.90 3.00 c 0.23 0.30 D 6.30 6.50 E 6.70 7.00 E1 3.30 3.50 e 2.30 BASIC e1 4.60 BASIC L 0.75 L2 0.25 BASIC ø 0º SIPEX Pkg Signoff Date/Rev: Date: 03/02/06 Variation AA MAX 1.80 0.10 1.70 0.84 3.10 0.35 6.70 7.30 3.70 10º MIN 0.001 0.060 0.026 0.114 0.010 0.248 0.264 0.130 NOM MAX 0.071 0.004 0.063 0.067 0.030 0.033 0.118 0.122 0.012 0.014 0.256 0.264 0.276 0.287 0.138 0.146 0.091 BASIC 0.182 BASIC 0.030 0.010 BASIC 0º 10º JL Aug8-05/Rev A SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 8 ©Copyright 2006 Sipex Corporation PACKAGE: 8 PIN NSOIC D D/2 SIDE VIEW 7 8 5 6 E1/2 A1 2 1 4 3 e (L1) b TOP VIEW ø1 h FRONT VIEW ø2 h R1 Gauge Plane R L2 ø SYMBOL A A1 A2 b c E E1 e h L L1 L2 R R1 ø ø1 ø2 D Seating Plane L 8 Pin NSOIC ø1 JEDEC MS-012 MIN NOM MAX MIN 1.35 0.10 1.25 0.31 0.17 6.00 BSC 3.90 BSC 1.27 BSC 1.75 0.25 1.65 0.51 0.25 0.053 0.004 0.049 0.012 0.007 0.50 1.27 0.010 0.016 8º 15º - 0.003 0.003 0º 5º 0º 0.25 0.40 c Variation AA Dimensions in Inches Conversion Factor: 1 Inch = 25.40 mm Dimensions in Millimeters: Controlling Dimension 1.04 REF 0.25 BSC 0.07 0.07 0º 5º 0º 4.90 BSC SIPEX Pkg Signoff Date/Rev: Date: 03/02/06 Seating Plane E E1 Pin1 Designator to be within this INDEX AREA (D/2 x E1/2) A2 A E/2 NOM SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 9 MAX 0.069 0.010 0.065 0.020 0.010 0.236 BSC 0.154 BSC 0.050 BSC 0.020 0.050 0.041 REF 0.010 BSC 8º 15º 0.193 BSC JL Aug16-05 / Rev A ©Copyright 2006 Sipex Corporation ORDERING INFORMATION Ordering No. SPX2920M3-3-3 SPX2920M3-3-3/TR SPX2920M3-5-0 SPX2920M3-5-0/TR SPX2920S-3-3 SPX2920S-3-3/TR SPX2920S-5-0 SPX2920S-5-0/TR SPX2920T-3-3 SPX2920T-3-3/TR SPX2920T-5-0 SPX2920T-5-0/TR SPX2920U-3-3 SPX2920U-5-0 Accuracy Output Voltage 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 3.3V 3.3V 5.0V 5.0V 3.3V 3.3V 5.0V 5.0V 3.3V 3.3V 5.0V 5.0V 3.3V 5.0V Packages 3-Pin SOT-223 3-Pin SOT-223 3-Pin SOT-223 3-Pin SOT-223 8-Pin NSOIC 8-Pin NSOIC 8-Pin NSOIC 8-Pin NSOIC 3-Pin TO-263 3-Pin TO-263 3-Pin TO-263 3-Pin TO-263 3-Pin TO-220 3-Pin TO-220 Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX2920T-3-3/TR = standard; SPX2920T-L-3-3/TR = lead free /TR = Tape and Reel Pack quantity is 500 for TO-263 and 2,500 for SOT-223 and NSOIC. Sipex Corporation Solved by Sipex TM Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Date: 03/02/06 SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 10 ©Copyright 2006 Sipex Corporation