S P X1 1 1 7 800mA Low Dropout Voltage Regulator August 2010 Rev. 2.1.0 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 The SPX1117 is offered in 3-pin SOT-223 and TO-263 surface mount packages. An output capacitor of 10µF provides unconditional stability while a smaller 2.2µF capacitor is sufficient for most applications. 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 Low Quiescent Current Low Dropout Voltage of 1.1V at 800mA 0.1% Line and 0.2% Load Regulation Stable with 2.2µF Ceramic Capacitor Overcurrent and Thermal Protection Lead Free, RoHS Compliant Packages SOT223 and TO263 FUNCTIONAL DIAGRAM Fig. 1: SPX1117 Application Diagram Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 – Fax. +1 510 668-7001 S P X1 1 1 7 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) ..................... 260°C Storage Temperature .............................. -65°C to 150°C Operating Junction Temperature Range ... -40°C to +125°C 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 = 25°C 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 = 25°C, and are provided for reference purposes only. Unless otherwise indicated, CIN = COUT =10µF, TA= 25°C. Parameter Min. Typ. 1.485 1.500 Max. Units Conditions 1.5V Version Output Voltage 1.515 1.530 1.470 V IOUT=5mA, VIN=3.0V, TJ=25°C • 5mA≤ IOUT ≤800mA, 2.9V≤ VIN ≤10V • 5mA≤ IOUT ≤800mA, 3.2V≤ VIN ≤10V • 5mA≤ IOUT ≤800mA, 3.9V≤ VIN ≤10V 1.8V Version Output Voltage 1.782 1.800 1.818 1.836 1.764 V IOUT=5mA, VIN=3.3V, TJ=25°C 2.5V Version Output Voltage 2.475 2.500 2.525 2.550 2.450 V IOUT=5mA, VIN=4.0V, TJ=25°C 3.3V Version Output Voltage 3.267 3.300 3.333 3.366 3.234 V IOUT=5mA, VIN=4.8V, TJ=25°C • 5.0V Version Output Voltage 4.950 5.000 5.050 5.100 4.900 V IOUT=5mA, VIN=6.5V, TJ=25°C • 5mA≤ IOUT ≤800mA, 6.4V≤ VIN ≤12V • 5mA≤IOUT≤800mA, 1.4V≤(VIN–VOUT)≤10V All Voltage Options Reference Voltage 1.238 1.250 Output Voltage Temperature Stability 1.262 1.270 1.225 0.3 Line Regulation (note 1) 3 Load Regulation (note 1) 7 mV mV 6 12 1.20 1.05 1.25 1.10 1.30 Quiescent Current 5 10 Adjust Pin Current 50 120 Current Limit 1.0 Thermal Regulation Ripple Rejection © 2011 Exar Corporation 60 IOUT=5mA, (VIN – VOUT)=2V, TJ=25°C % 1.00 Dropout Voltage (note 2) V • 5mA≤ IOUT ≤800mA, VOUT = Fixed/Adj. • IOUT=100mA • IOUT=500mA • IOUT=800mA mA • 4.25V≤ VIN ≤6.5V µA • V 1.5 2.0 A 0.01 0.1 %/W 75 dB 2/11 VINMIN≤ VIN ≤12V, VOUT = Fixed/Adj., IOUT=5mA (VIN – VOUT)=5V 25°C, 30ms pulse fRIPPLE=120Hz, (VIN – VOUT)=2V, VRIPPLE=1VPP Rev. 2.1.0 S P X1 1 1 7 800mA Low Dropout Voltage Regulator Parameter Min. Long Term Stability RMS Output Noise Typ. Max. Units Conditions 0.03 % 125°C, 1000Hrs 0.003 % % of VOUT, 10Hz≤f≤10kHz 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 Part Number SPX1117M3-L SPX1117M3-L/TR SPX1117M3-L-1-5 SPX1117M3-L-1-5/TR SPX1117M3-L-1-8 SPX1117M3-L-1-8/TR SPX1117M3-L-2-5 SPX1117M3-L-2-5/TR SPX1117M3-L-3-3 SPX1117M3-L-3-3/TR SPX1117M3-L-5-0 SPX1117M3-L-5-0/TR SPX1117T-L SPX1117T-L/TR SPX1117T-L-3-3 SPX1117T-L-3-3/TR Temperature Range Marking Package -40°C≤TJ≤+125°C 1117M3 YYWWL SOT223-3 -40°C≤TJ≤+125°C 1117M3 15YYWWL SOT223-3 -40°C≤TJ≤+125°C 1117M3 18YYWWL SOT223-3 -40°C≤TJ≤+125°C 1117M3 25YYWWL SOT223-3 -40°C≤TJ≤+125°C 1117M3 33YYWWL SOT223-3 -40°C≤TJ≤+125°C 1117M3 50YYWWL SOT223-3 -40°C≤TJ≤+125°C SPX1117T YYWWLX TO-263-3 -40°C≤TJ≤+125°C SPX1117T 33YYWWLX TO-263-3 Packing Quantity 78/Tube 2.5K/Tape & Reel 78/Tube 2.5K/Tape & Reel 78/Tube 2.5K/Tape & Reel 78/Tube 2.5K/Tape & Reel 78/Tube 2.5K/Tape & Reel 78/Tube 2.5K/Tape & Reel 50/Tube 500/Tape & Reel 50/Tube 500/Tape & Reel Note 1 Note 2 Lead Free Lead Free Lead Free Lead Free Lead Free Lead Free Lead Free Lead Free “YY” = Year – “WW” = Work Week – “L” = Lead Free Indicator - “X” = Lot Number © 2011 Exar Corporation 3/11 Rev. 2.1.0 S P X1 1 1 7 800mA Low Dropout Voltage Regulator TYPICAL PERFORMANCE CHARACTERISTICS All data taken at TA = 25°C, 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=2.2µF Fig. 6: Current Limit IOUT pulsed from 10mA to Current limit SPX1117M3-L-3-3, VIN=4.8V, CIN=COUT=2.2µF 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 © 2011 Exar Corporation 4/11 Rev. 2.1.0 S P X1 1 1 7 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) © 2011 Exar Corporation 5/11 Rev. 2.1.0 S P X1 1 1 7 800mA Low Dropout Voltage Regulator APPLICATION INFORMATION OUTPUT CAPACITOR To ensure the stability of the SPX1117, an output capacitor of at least 2.2µF (tantalum or ceramic) or 10µF (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 0.5Ωor less. A larger value of output capacitance (up to 100µF) 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=10µF, COUT=2.2µF, Ceramic Signal 1=VOUT, Signal 4=ILOAD THERMAL CHARACTERISTICS The thermal resistance of SPX1117 (SOT-223 package) is 15°C/W from junction to tab and 31°C/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 >155°C 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 attached to the pad area and a ground plane Fig. 17: Load Step Response 0mA to 800mA VIN=3.3V, VOUT=1.8V, CIN=10µF, COUT=2.2µF, OSCON Signal 1=VOUT, Signal 4=ILOAD © 2011 Exar Corporation 6/11 Rev. 2.1.0 S P X1 1 1 7 800mA Low Dropout Voltage Regulator Where layer on the backside of the substrate. Refer to table 1 for the results of the experiment. C: value of capacitor in Farads FR: ripple frequency in Hz R1: value of resistor R1 in ohms 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: SPX1117 power dissipation is calculated as follows: Maximum Junction Temperature . Maximum junction exceed 125°C. temperature must Where M=multiplier for the ripple seen when the ADJ pin is optimally bypassed. not VREF=1.25V Ripple rejection for the adjustable version is shown in Figure 20. Fig. 20: Ripple Rejection VIN=3.3V, VOUT=1.8V(adj), ILOAD=200mA Fig. 19: Substrate Layout for SOT-223 OUTPUT VOLTAGE RIPPLE REJECTION 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 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 10μF for an electrolytic aluminum capacitor or 2.2μF for a ceramic or solid tantalum capacitor (Fig 22). 1.25 A small correction to this formula is required depending on the values of resistors R1 and R2, since the adjustable pin current (approx 50μA) 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: 1 Where VREF=1.25V 6.28 © 2011 Exar Corporation 7/11 Rev. 2.1.0 S P X1 1 1 7 800mA Low Dropout Voltage Regulator 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 © 2011 Exar Corporation 8/11 Rev. 2.1.0 S P X1 1 1 7 800mA Low Dropout Voltage Regulator PACKAGE SPECIFICATION 3-PIN SOT-223 © 2011 Exar Corporation 9/11 Rev. 2.1.0 S P X1 1 1 7 800mA Low Dropout Voltage Regulator 3-PIN TO-263 © 2011 Exar Corporation 10/11 Rev. 2.1.0 S P X1 1 1 7 800mA Low Dropout Voltage Regulator REVISION HISTORY Revision Date 2.0.0 06/23/2010 Reformat of Datasheet Description 2.1.0 08/24/2011 Addition of the Pre-Bias Output Voltage Start-up section FOR FURTHER ASSISTANCE Email: [email protected] Exar Technical Documentation: http://www.exar.com/TechDoc/default.aspx? EXAR CORPORATION HEADQUARTERS AND SALES OFFICES 48720 Kato Road Fremont, CA 94538 – USA Tel.: +1 (510) 668-7000 Fax: +1 (510) 668-7030 www.exar.com NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. or its in all Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. © 2011 Exar Corporation 11/11 Rev. 2.1.0