SPX1117 800mA Low Dropout Voltage Regulator September 2018 Rev. 2.1.1 GENERAL DESCRIPTION APPLICATIONS The SPX1117 is a low power positive-voltage regulator designed to satisfy moderate power requirements with a cost effective, small footprint solution. * Desktop PC Servers This device is an excellent choice for use in battery-powered applications and portable computers. The SPX1117 features very low quiescent current and a low dropout voltage of 1.1V at a full load. As output current decreases, quiescent current flows into the load, increasing efficiency. SPX1117 is available in adjustable or fixed 1.5V, 1.8V, 2.5V, 3.3V and 5V output voltages. * Power Supplies * Graphic/Video Cards * Industrial Equipments FEATURES * Guaranteed 800mA Output Current * Guaranteed 1A Peak Current * Three Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V, 3.3V and 5V The SPX1117 is offered in a 3-pin SOT-223 surface mount packages. * Low Quiescent Current * Low Dropout Voltage of 1.1V at 800mA An output capacitor of 10F provides unconditional stability while a smaller 2.2F capacitor is sufficient for most applications. * 0.1% Line and 0.2% Load Regulation * Stable with 2.2F Ceramic Capacitor * Overcurrent and Thermal Protection * Lead Free, RoHS Compliant SOT223 Package FUNCTIONAL DIAGRAM Fig. 1: SPX1117 Application Diagram 1/11 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Power Dissipation ................................ Internally Limited Lead Temperature (Soldering, 5 sec) ..................... 260C Storage Temperature .............................. -65C to 150C Operating Junction Temperature Range ... -40C to +125C Input Supply Voltage .............................................. 20V Input to Output Voltage ........................................18.8V ESD Rating (HBM - Human Body Model) .................... 2kV ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Ambient Temperature of TA = 25C only; limits applying over the full Operating Junction Temperature range are denoted by a "*". Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25C, and are provided for reference purposes only. Unless otherwise indicated, CIN = COUT =10F, TA= 25C. Parameter Min. Typ. Max. 1.485 1.500 1.515 Units Conditions 1.5V Version Output Voltage 1.530 1.470 V IOUT=5mA, VIN=3.0V, TJ=25C * 5mA IOUT 800mA, 2.9V VIN 10V 1.8V Version Output Voltage 1.782 1.800 1.818 1.836 1.764 V IOUT=5mA, VIN=3.3V, TJ=25C * 5mA IOUT 800mA, 3.2V VIN 10V 2.5V Version Output Voltage 2.475 2.500 2.525 2.550 2.450 V IOUT=5mA, VIN=4.0V, TJ=25C * 5mA IOUT 800mA, 3.9V VIN 10V 3.3V Version Output Voltage 3.267 3.300 3.333 3.366 3.234 V IOUT=5mA, VIN=4.8V, TJ=25C * 5.0V Version Output Voltage 4.950 5.000 5.050 5.100 4.900 V IOUT=5mA, VIN=6.5V, TJ=25C * 5mA IOUT 800mA, 6.4V VIN 12V All Voltage Options Reference Voltage 1.238 1.250 Output Voltage Temperature Stability 1.262 1.270 1.225 0.3 V 3 7 mV Load Regulation (note 1) 6 12 mV 1.00 1.20 1.05 1.25 1.10 1.30 Quiescent Current 5 10 Adjust Pin Current 50 120 1.5 2.0 A 0.01 0.1 %/W Current Limit 1.0 Thermal Regulation Ripple Rejection 60 5mAIOUT800mA, 1.4V(VIN-VOUT)10V % Line Regulation (note 1) Dropout Voltage (note 2) IOUT=5mA, (VIN - VOUT)=2V, TJ=25C * 75 * 5mA IOUT 800mA, VOUT = Fixed/Adj. * IOUT=100mA * IOUT=500mA * IOUT=800mA mA * 4.25V VIN 6.5V A * V dB 2/11 VINMIN VIN 12V, VOUT = Fixed/Adj., IOUT=5mA (VIN - VOUT)=5V 25C, 30ms pulse fRIPPLE=120Hz, (VIN - VOUT)=2V, VRIPPLE=1VPP Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator Parameter Min. Typ. RMS Output Noise Max. Units Conditions 0.03 % 125C, 1000Hrs 0.003 % % of VOUT, 10Hzf10kHz Long Term Stability Note 1: For fixed voltage option VINMIN=VOUT+1.5V For adjustable voltage option VIN-VOUT=1.4V Note 2: Dropout voltage is the input voltage minus output voltage that produces a 1% decrease in output voltage with respect to the nominal output voltage at VIN=VOUT+1.5V PIN ASSIGNMENT Fig. 2: SPX1117 Pin Assignment (Top View, TAB connected to VOUT) ORDERING INFORMATION(1) Part Number Operating Temperature Range Lead-Free Package Packing Method Output Voltage Adjustable SPX1117M3-L/TR 1.5V SPX1117M3-L-1-5/TR 1.8V SPX1117M3-L-1-8/TR -40CTJ+125C Yes(2) SOT223-3 Tape & Reel SPX1117M3-L-2-5/TR 2.5V SPX1117M3-L-3-3/TR 3.3V SPX1117M3-L-5-0/TR 5.0V NOTE: 1. Refer to www.exar.com/SPX1117 for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. 3/11 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator TYPICAL PERFORMANCE CHARACTERISTICS All data taken at TA = 25C, unless otherwise specified - Schematic and BOM from Application Information section of this datasheet. Fig. 3: Load Regulation SPX1117M3-L-3-3, VIN=4.8V Fig. 4: Line Regulation SPX1117M3-L-3-3, IOUT=10mA Fig. 5: Dropout Voltage vs Output Current SPX1117M3-L-3-3, VIN=4.8V, COUT=2.2F Fig. 6: Current Limit IOUT pulsed from 10mA to Current limit SPX1117M3-L-3-3, VIN=4.8V, CIN=COUT=2.2F Fig. 7: Current Limit Output Voltage Deviation SPX1117M3-L-3-3, IOUT=10mA to 1A Step Fig. 8: VOUT vs Temperature VIN=2.5V, IOUT=10mA 4/11 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator Fig. 9: VIN=3.0V, IOUT=10mA Fig. 10: VIN=3.3V, IOUT=10mA Fig. 11: VIN=4.0V, IOUT=10mA Fig. 12: VIN=4.85V, IOUT=10mA Fig. 13: Line Regulation vs Temperature VOUT=1.8V (Adj), VIN=3.3V Fig. 14: Output Voltage vs Temperature Different IOUT, VOUT=1.8V (Adj), VIN=3.3V Fig. 15: Line Regulation over Temperature ILOAD=800mA, VOUT=1.8V(adj) 5/11 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator APPLICATION INFORMATION OUTPUT CAPACITOR To ensure the stability of the SPX1117, an output capacitor of at least 2.2F (tantalum or ceramic) or 10F (aluminum) is required. The value may change based on the application requirements of the output load or temperature range. The value of ESR can vary based on the type of capacitor used in the applications to guarantee stability. The recommended value for ESR is 0.5 or less. A larger value of output capacitance (up to 100F) can improve the load transient response. Fig. 18 SOLDERING METHODS The SPX1117 SOT-223 package is designed to be compatible with infrared reflow or vaporphase reflow soldering techniques. During soldering, the non-active or mildly active fluxes may be used. The SPX1117 die is attached to the heatsink lead which exits opposite the input, output, and ground pins. Hand soldering and wave soldering should be avoided since these methods can cause damage to the device with excessive thermal gradients on the package. The SOT-223 recommended soldering method are as follows: vapor phase reflow and infrared reflow with the component preheated to within 65C of the soldering temperature range. Fig. 16: Load Step Response 0mA to 800mA VIN=3.3V, VOUT=1.8V, CIN=10F, COUT=2.2F, Ceramic Signal 1=VOUT, Signal 4=ILOAD THERMAL CHARACTERISTICS The thermal resistance of SPX1117 (SOT-223 package) is 15C/W from junction to tab and 31C/W from tab to ambient for a total of 46 C/W from junction to ambient (Table 1). The SPX1117 features the internal thermal limiting to protect the device during overload conditions. Special care needs to be taken during continuous load conditions such that the maximum junction temperature does not exceed 125 C. Thermal protection is activated at >155C and deactivated at <140 C. Taking the FR-4 printed circuit board and 1/16 thick with 1 ounce copper foil as an experiment (fig.19), the PCB material is effective at transmitting heat with the tab Fig. 17: Load Step Response 0mA to 800mA VIN=3.3V, VOUT=1.8V, CIN=10F, COUT=2.2F, OSCON Signal 1=VOUT, Signal 4=ILOAD 6/11 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator attached to the pad area and a ground plane layer on the backside of the substrate. Refer to table 1 for the results of the experiment. Where The thermal interaction from other components in the application can affect the thermal resistance of the SPX1117. The actual thermal resistance can be determined with experimentation. If an ADJ-bypass capacitor is used, the amplitude of the output ripple will be independent of the output voltage. If an ADJbypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: = ( - ) x Maximum Junction Temperature = = () + x ( . ) temperature must 1 6.28 x x 1 C: value of capacitor in Farads FR: ripple frequency in Hz R1: value of resistor R1 in ohms SPX1117 power dissipation is calculated as follows: Maximum junction exceed 125C. = not Where M=multiplier for the ripple seen when the ADJ pin is optimally bypassed. VREF=1.25V Ripple rejection for the adjustable version is shown in Figure 20. Fig. 19: Substrate Layout for SOT-223 Fig. 20: Ripple Rejection VIN=3.3V, VOUT=1.8V(adj), ILOAD=200mA RIPPLE REJECTION OUTPUT VOLTAGE Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground as shown in Figure 23. When ADJ pin bypassing is used, the value of the output capacitor required increases to its maximum. If the ADJ pin is not bypassed, the value of the output capacitor can be lowered to 10F for an electrolytic aluminum capacitor or 2.2F for a ceramic or solid tantalum capacitor (Fig 22). The output of the adjustable regulator can be set to any voltage between 1.25V and 15V. The value of VOUT can be quickly approximated using the formula = 1.25 x 1 + 2 1 A small correction to this formula is required depending on the values of resistors R1 and R2, since the adjustable pin current (approx 50A) flows through R2. When IADJ is taken into account, the formula becomes However the value of the ADJ-bypass capacitor should be chosen with respect to the following equation: 7/11 = x 1 + 2 + x 2 1 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator Where VREF=1.25V PRE-BIAS OUTPUT VOLTAGE START-UP The SPX1117 is not intended for operations requiring start-up into a pre-biased load. Proper discharge of the output voltage is recommended prior of turning on the device through the application of the input voltage. LAYOUT CONSIDERATIONS Parasitic line resistance can degrade local regulation. In order to avoid this, connect R1 directly to VOUT as illustrated in figure 25. For the same reason R2 should be connected to the negative side of the load. Fig. 24: 5V Regulator with Shutdown Fig. 25: Recommended Connections for Best Results Fig. 21: Current Cource Fig. 22:Typical Adjustable Regulator PC Board mm2 Topside Copper mm2 Backside Copper mm2 Thermal Resistance Jct to amb. C/W 2500 2500 2500 2500 2500 1600 2500 2500 1600 900 900 2500 1250 950 2500 1800 600 1250 915 600 240 240 2500 2500 2500 0 0 1600 0 0 0 900 0 46 47 49 51 53 55 58 59 67 72 85 Table 1 Fig. 23: Improving Ripple Rejection 8/11 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator MECHANICAL DIMENSIONS 3-PIN SOT-223 9/11 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator RECOMMENDED LAND PATTERN AND STENCIL 3-PIN SOT-223 10/11 Rev. 2.1.1 SPX1117 800mA Low Dropout Voltage Regulator REVISION HISTORY Revision Date Description 2.0.0 06/23/2010 Reformat of Datasheet 2.1.0 08/24/2011 Addition of the Pre-Bias Output Voltage Start-up section 2.1.1 09/05/2018 Update to MaxLinear logo. Update format and Ordering Information. Removed obsolete TO-263-3. 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Company and product names may be registered trademarks or trademarks of the respective owners with which they are associated. (c) 2011 - 2018 MAXLINEAR, INC. ALL RIGHTS RESERVED 11/11 Rev. 2.1.1