® REG1117 REG1117A 800mA and 1A Low Dropout Positive Regulator 2.85V, 3V, 3.3V, 5V, and Adjustable FEATURES APPLICATIONS ● 2.85V, 3V, 3.3V, 5V, and ADJUSTABLE VERSIONS ● SCSI-2 ACTIVE TERMINATION ● HAND-HELD DATA COLLECTION DEVICES ● 2.85V MODEL FOR SCSI-2 ACTIVE TERMINATION ● HIGH EFFICIENCY LINEAR REGULATORS ● 5V LINEAR REGULATORS ● BATTERY POWERED INSTRUMENTATION ● OUTPUT CURRENT: REG1117: 800mA max REG1117A: 1A max ● OUTPUT TOLERANCE: ±1% max ● DROPOUT VOLTAGE: REG1117: 1.2V max at IO = 800mA REG1117A: 1.3V max at IO = 1A ● BATTERY MANAGEMENT CIRCUITS FOR NOTEBOOK AND PALMTOP PCs ● INTERNAL CURRENT LIMIT ● THERMAL OVERLOAD PROTECTION ● SOT-223 SURFACE MOUNT PACKAGE The REG1117 is a family of three-terminal voltage regulators capable of up to 800mA output. Fixed output models include 2.85V, 3V, 3.3V and 5V versions. The REG1117A provides 1A of output current in an adjustable version. Output voltage of the adjustable versions is set with two external resistors. The REG1117’s low dropout voltage allows its use with as little as 1V inputoutput voltage differential. Laser trimming assures excellent output voltage accuracy without adjustment. An NPN output stage allows output stage drive to contribute to the load current for maximum efficiency. REG1117 and REG1117A are packaged in an SOT-223 surface-mount package, suitable for reflow soldering techniques. 1.4 Dropout Voltage (V) DESCRIPTION DROPOUT VOLTAGE (VIN – VOUT) 1.6 Max, TJ = 0°C to 125°C 1.2 1.0 Typical, TJ = 25°C 0.8 0.6 Max, TJ = 25°C = Test Points, REG1117A only = Test Points, REG1117 and REG1117A 0.4 0 100 200 300 400 500 600 700 800 900 1000 Output Current (mA) International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111 Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 © 1992 Burr-Brown Corporation PDS-1162E Printed in U.S.A. November, 1996 SPECIFICATIONS At TJ = +25°C, unless otherwise noted. REG1117, REG1117A PARAMETER CONDITIONS MIN TYP MAX UNITS Note 1 IO = 10mA, VIN = 4.85V IO = 0 to 800mA, VIN = 4.05 to 10V 2.82 2.79 2.85 2.85 2.88 2.91 V V Note 1 IO = 10mA, VIN = 5V IO = 0 to 800mA, VIN = 4.5 to 10V 2.97 2.94 3.00 3.00 3.03 3.06 V V Note 1 IO = 10mA, VIN = 5.3V IO = 0 to 800mA, VIN = 4.8 to 10V 3.27 3.24 3.30 3.30 3.33 3.36 V V Note 1 IO = 10mA, VIN = 7V IO = 0 to 800mA, VIN = 6.5 to 10V 4.95 4.90 5.00 5.00 5.05 5.10 V V Note 1 IO = 10mA, VIN – VO = 2V IO = 10 to 800mA, VIN – VO = 1.4 to 10V 1.238 1.225 1.250 1.250 1.262 1.280 V V Note 1 IO = 10mA, VIN – VO = 2V IO = 10mA to 1A, VIN – VO = 1.4 to 10V 1.238 1.225 1.250 1.250 1.262 1.280 V V IO = 0, VIN = 4.25 to 10V IO = 0, VIN = 4.5 to 10V IO = 0, VIN = 4.8 to 10V IO = 0, VIN = 6.5 to 15V IO = 10mA, VIN – VO = 1.5 to 13.75V IO = 10mA, VIN – VO = 1.5 to 13.75V 1 2 2 3 0.1 0.1 7 7 7 10 0.4 0.4 mV mV mV mV % % IO = 0 to 800mA, VIN = 4.25V IO = 0 to 800mA, VIN = 4.5V IO = 0 to 800mA, VIN = 4.8V IO = 0 to 800mA, VIN = 6.5V IO = 10 to 800mA, VIN – VO = 3V IO = 10mA to 1A, VIN – VO = 3V 2 2 3 3 0.1 0.1 10 12 12 15 0.4 0.4 mV mV mV mV % % IO = 100mA IO = 500mA IO = 800mA IO = 1A IO = 1A 1.00 1.05 1.10 1.2 1.2 1.10 1.15 1.20 1.30 1.55 V V V V V 950 1250 1200 1600 mA mA VIN – VO = 13.75V 1.7 5 mA VIN – VO = 5V IO = 10mA, VIN – VO = 1.4 to 10V IO = 10mA to 800mA, VIN – VO = 1.4 to 10V IO = 10mA to 1A, VIN – VO = 1.4 to 10V 4 50 0.5 0.5 10 120 5 5 mA µA µA µA 30ms Pulse 0.01 0.1 %/W OUTPUT VOLTAGE REG1117-2.85 REG1117-3 REG1117-3.3 REG1117-5 REFERENCE VOLTAGE REG1117 (Adjustable) REG1117A (Adjustable) LINE REGULATION REG1117-2.85 REG1117-3 REG1117-3.3 REG1117-5 REG1117 (Adjustable) REG1117A (Adjustable) LOAD REGULATION REG1117-2.85 REG1117-3 REG1117-3.3 REG1117-5 REG1117 (Adjustable) REG1117A (Adjustable) Note Note Note Note Note Note 1 1 1 1 1 1 Note 1 Note 1 Note 1 Note 1 Note 1, 2 Note 1, 2 DROPOUT VOLTAGE All Models Note Note Note Note REG1117 Models REG1117A 3 1 1 1 Note 1 CURRENT LIMIT REG1117 Models REG1117A MINIMUM LOAD CURRENT Adjustable Models VIN – VO = 5V VIN – VO = 5V Note 1, 2 QUIESCENT CURRENT Fixed-Voltage Models Note 1 Adjust Pin Current Note1, 2 vs Load Current, REG1117 Note 1 vs Load Current, REG1117A Note 1 THERMAL REGULATION All Models Note 4 RIPPLE REJECTION All Models 800 1000 f = 120Hz, VIN – VOUT = 3V+1VPP Ripple 62 dB TEMPERATURE DRIFT Fixed-Voltage Models Adjustable Models TJ = 0°C to +125°C TJ = 0°C to +125°C 0.5 2 % % LONG-TERM STABILITY All Models TA = +125°C, 1000Hr 0.3 % f = 10Hz to 10kHz 0.003 % OUTPUT NOISE RMS noise All Models THERMAL RESISTANCE Operating Junction Temperature Range Storage Range Thermal Resistance, θJC 3-Lead SOT-223 Surface-Mount 0 –55 (Junction-to-Case at Tab) +125 +125 15 °C °C °C/W NOTES: (1) Specification applies over the full operating Junction temperature range, 0°C to 125°C. (2) REG1117 and REG1117A adjustable versions require a minimum load current for ±3% regulation. (3) Dropout voltage is the Input voltage minus output voltage that produces a 1% decrease in output voltage. (4) Percentage change in unloaded output voltage before vs after a 30ms power pulse of IO = 800mA (REG1117 models), IO = 1A (REG1117A), VIN – VO = 1.4V (Reading taken 10ms after pulse). ® REG1117 2 ABSOLUTE MAXIMUM RATINGS ORDERING INFORMATION PRODUCT(1) Power Dissipation ........................................................... Internally Limited Input Voltage ........................................................................................ 15V Operating Junction Temperature Range ............................. 0°C to +125°C Storage Temperature Range .......................................... –40°C to +150°C Lead Temperature (soldering, 10s)(1) ............................................. +300°C NOTE: (1) See “Soldering Methods.” CONNECTION DIAGRAM Front View PART MARKING PACKAGE 800mA Current Out REG1117-2.85 REG1117-3 REG1117-3.3 REG1117-5 REG1117 BB11172 BB11173 BB11174 BB11175 BB1117 Plastic SOT-223 Plastic SOT-223 Plastic SOT-223 Plastic SOT-223 Plastic SOT-223 1A Current Out REG1117A BB1117A Plastic SOT-223 NOTE: (1) Available in Tape and Reel, add –TR to Model Number. SOT-223 FRONT VIEW PACKAGE INFORMATION Tab is VOUT PRODUCT Ground VOUT (Adj.)(1) VIN Plastic SOT-223 NOTE: (1) Adjustable-Voltage Model. PACKAGE PACKAGE DRAWING NUMBER(1) 800mA Current Out REG1117-2.85 REG1117-3 REG1117-3.3 REG1117-5 REG1117 Plastic Plastic Plastic Plastic Plastic SOT-223 SOT-223 SOT-223 SOT-223 SOT-223 311 311 311 311 311 1A Current Out REG1117A Plastic SOT-223 311 NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. SIMPLIFIED SCHEMATIC VIN + Current Limit Thermal Limit VOUT 10X (Substrate) Ground (Fixed-Voltage Models) Adj. (Adjustable-Voltage Model) The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® 3 REG1117 TYPICAL PERFORMANCE CURVE At TJ = +25°C, unless otherwise specified. LOAD REGULATION ∆ILOAD = 800mA 1400 1 1300 0 Output Voltage Deviation (mV) Short-Circuit Current (mA) SHORT-CIRCUIT CURRENT vs TEMPERATURE REG1117A 1200 1100 REG1117 Models 1000 900 800 –50 –25 0 25 50 75 –1 REG1117-2.85 –2 –3 –4 REG1117-5 –5 –6 –7 –50 100 –25 0 Temperature (°C) 75 100 100 IOUT = 100mA VRIPPLE = 1.0Vp-p 90 5 VIN = 6.5V to 15V REG1117-5 4 80 Ripple Rejection (dB) Output Voltage Change (mV) 50 RIPPLE REJECTION vs FREQUENCY LINE REGULATION vs TEMPERATURE 6 3 2 1 REG1117-2.85 VIN = 4.25V to 10V 0 70 60 50 40 30 20 –1 10 0 –2 –50 –25 0 25 50 75 10 100 100 1k 10k 100k Frequency (Hz) Temperature (°C) OUTPUT VOLTAGE vs TEMPERATURE QUIESCENT CURRENT vs TEMPERATURE 2.0 8 Quiescent Current (mA) 7 Output Voltage Change (%) 25 Temperature (°C) 1.0 0 –1.0 Fixed-Voltage Models 6 5 4 3 2 1 –2.0 –50 –25 0 25 50 75 0 –50 100 Temperature (°C) 0 25 Temperature (°C) ® REG1117 –25 4 50 75 100 TYPICAL PERFORMANCE CURVE (CONT) At TJ = +25°C, unless otherwise specified. LINE TRANSIENT RESPONSE LOAD TRANSIENT RESPONSE Output Voltage Deviation (mV) Output Voltage Deviations (V) 60 0.1 0 –0.1 CIN = 1µF COUT = 10µF Tantalum IOUT = 0.1A 40 20 0 0 –0.5 0 20 40 60 Time (µs) 80 100 4.25 3.25 0 20 40 60 80 100 120 140 160 180 200 The REG1117 has current limit and thermal shutdown circuits that protect it from overload. The thermal shutdown activates at approximately TJ = 165°C. For continuous operation, however, the junction temperature should not be allowed to exceed 125°C. Any tendency to activate the thermal shutdown in normal use is an indication of an inadequate heat sink or excessive power dissipation. The power dissipation is equal to: PD = (VIN – VOUT) IOUT The junction temperature can be calculated by: TJ = TA + PD (θJA) where TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance The REG1117 derives heat sinking from conduction through its copper leads, especially the large mounting tab. These must be soldered to a circuit board with a substantial amount of copper remaining (see Figure 3). Circuit board traces connecting to the tab and the leads should be made as large as practical. Other nearby circuit traces, including those on the back side of the circuit board, help conduct heat away VO REG1117 + 5.25 THERMAL CONSIDERATIONS Figure 1 shows the basic hookup diagram for fixed-voltage models. All models require an output capacitor for proper operation and to improve high frequency load regulation. A 10µF tantalum capacitor is recommended. Aluminum electrolytic types of 50µF or greater can also be used. A high quality capacitor should be used to assure that the ESR (effective series resistance) is less than 0.5Ω. Figure 2 shows a the hookup diagram for the adjustable voltage model. Resistor values are shown for some commonly used output voltages. Values for other voltages can be calculated from the equation shown in Figure 2. For best load regulation, connect R1 close to the output pin and R2 close to the ground side of the load as shown. 10µF Tantalum –40 Time (µs) APPLICATIONS INFORMATION VIN Input Voltage (V) Load Current (A) –20 CIN = 10µF COUT = 10µF Tantalum VIN = 4.25V Preload = 0.1A 0.5 + 10µF Tantalum FIGURE 1. Fixed-Voltage Model—Basic Connections. VIN C1 + 10µF 3 REG1117 (Adj) 1 C3(1) + 10µF VO 2 R1 + C2 10µF Load VO = R 1 + R2 R1 • (1.25V) + (50µA) (R2) R2 This term is negligible with proper choice of values—see table at right. VOUT (V) R1 (Ω)(2) R2 (Ω)(2) 1.25 1.5 2.1 2.85 3 3.3 5 10 Open 750 158 169 137 115 113 113 Short 147 107 215 191 187 340 787 NOTE: (1) C3 optional. Improves high-frequency line rejection. (2) Resistors are standard 1% values. FIGURE 2. Adjustable-Voltage Model—Basic Connections. ® 5 REG1117 SOLDERING METHODS The REG1117 package is suitable for infrared reflow and vapor-phase reflow soldering techniques. The high rate of temperature change that occurs with wave soldering, or hand soldering can damage the REG1117. Total Area: 50 x 50mm 35 x 17 mm 16 x 10 mm TOPSIDE(1) COPPER AREA BACKSIDE COPPER AREA 2500mm2 2500mm2 2500mm2 46°C/W 2500mm2 1250mm2 2500mm2 47°C/W 2500mm2 950mm2 2500mm2 49°C/W 2500mm2 2500mm2 0 51°C/W 2500mm2 1800mm2 0 53°C/W 1600mm2 600mm2 1600mm2 55°C/W 2500mm2 1250mm2 0 58°C/W 2500mm2 915mm2 0 59°C/W 1600mm2 600mm2 0 67°C/W 900mm2 340mm2 900mm2 72°C/W 900mm2 340mm2 0 85°C/W TOTAL PC BOARD AREA 16 x 10 mm Without back-side copper: θJA ≈ 59°C/W With solid back-side copper: θJA ≈ 49°C/W FIGURE 3. Circuit Board Layout Example. from the device, even though they are not electrically connected. Make all nearby copper traces as wide as possible and leave only narrow gaps between traces. Table I shows approximate values of θJA for various circuit board and copper areas. Nearby heat dissipating components, circuit board mounting conditions and ventilation can dramatically affect the actual θJA. A simple experiment will determine whether the maximum recommended junction temperature is exceeded in an actual circuit board and mounting configuration: Increase the ambient temperature above that expected in normal operation until the device’s thermal shutdown is activated. If this occurs at more than 40°C above the maximum expected ambient temperature, then the TJ will be less than 125°C during normal operation. NOTE: (1) Tab is attached to the topside copper. TABLE I. INSPEC Abstract Number: B91007604, C91012627 Kelly, E.G. “Thermal Characteristics of Surface 5WK9Ω Packages.” The Proceedings of SMTCON. Surface Mount Technology Conference and Exposition: Competitive Surface Mount Technology, April 3-6, 1990, Atlantic City, NJ, USA. Abstract Publisher: IC Manage, 1990, Chicago, IL, USA. TERMPWR 5V TERMPWR 2.85V 1N5817 110Ω 110Ω 2.85V REG1117-2.85 10µF THERMAL RESISTANCE JUNCTION-TO-AMBIENT 5V 1N5817 REG1117-2.85 10µF 10µF 10µF (Up to 27 Lines) 110Ω 110Ω FIGURE 4. SCSI Active Termination Configuration. REG1117-5 In VIN > 12V 10µF REG1117-5 Out + 5V to 10V + GND In VIN > 9.0V 100µF 10µF + Out GND 2.5VOUT 10µF + 1kΩ REF1004-2.5 FIGURE 5. Adjusting Output of Fixed Voltage Models. FIGURE 6. Regulator with Reference. ® REG1117 6 7.5V + 100µF REG1117-5 VIN In 10µF 5.2V Line 5.0V Battery Out + GND 50Ω 1kΩ REG1117-5 In 6.5V 10µF Out GND + + 100µF FIGURE 7. Battery Backed-Up Regulated Supply. REG1117-5 In VIN 10µF + Out GND + 100µF VOUT = –5V Floating Input FIGURE 8. Low Dropout Negative Supply. ® 7 REG1117