800mA and 1A Low Dropout Positive Regulator 2.85V, 3V, 3.3V, 5V, and Adjustable
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1 A 8mA and A Low Dropout Positive Regulator.85V, 3V, 3.3V, 5V, and Adjustable FEATURES.85V, 3V, 3.3V, 5V, and ADJUSTABLE VERSIONS.85V MODEL FOR SCSI- ACTIVE TERMINATION OUTPUT CURRENT: : 8mA max A: A max OUTPUT TOLERANCE: ±% max DROPOUT VOLTAGE: :.V max at I O = 8mA A:.3V max at I O = A INTERNAL CURRENT LIMIT THERMAL OVERLOAD PROTECTION SOT-3 SURFACE MOUNT PACKAGE DESCRIPTION The is a family of three-terminal voltage regulators capable of up to 8mA output. Fixed output models include.85v, 3V, 3.3V and 5V versions. The A provides A of output current in an adjustable version. put voltage of the adjustable versions is set with two external resistors. The s low dropout voltage allows its use with as little as V 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. and A are packaged in an SOT-3 surface-mount package, suitable for reflow soldering techniques. Dropout Voltage (V) APPLICATIONS SCSI- ACTIVE TERMINATION HAND-HELD DATA COLLECTION DEVICES HIGH EFFICIENCY LINEAR REGULATORS 5V LINEAR REGULATORS BATTERY POWERED INSTRUMENTATION BATTERY MANAGEMENT CIRCUITS FOR NOTEBOOK AND PALMTOP PCs DROPOUT VOLTAGE ( V OUT ) Max, T J = C to 5 C Typical, T J = 5 C.6 = Test Points, A only = Test Points, and A put Current (ma) Max, T J = 5 C ternational Airport dustrial Park Mailing Address: PO Box 4, Tucson, AZ Street Address: 673 S. Tucson Blvd., Tucson, AZ 8576 Tel: (5) 746- Twx: ternet: FAXLine: (8) (US/Canada Only) Cable: BBRCORP Telex: FAX: (5) Immediate Product fo: (8) Burr-Brown Corporation PDS-6E Printed in U.S.A. November, 996
2 SPECIFICATIONS At T J = +5 C, unless otherwise noted., A PARAMETER CONDITIONS MIN TYP MAX UNITS OUTPUT VOLTAGE -.85 I O = ma, = 4.85V V Note I O = to 8mA, = 4.5 to V V -3 I O = ma, = 5V V Note I O = to 8mA, = 4.5 to V V -3.3 I O = ma, = 5.3V V Note I O = to 8mA, = 4.8 to V V -5 I O = ma, = 7V V Note I O = to 8mA, = 6.5 to V V REFERENCE VOLTAGE (Adjustable) I O = ma, V O = V V Note I O = to 8mA, V O =.4 to V V A (Adjustable) I O = ma, V O = V V Note I O = ma to A, V O =.4 to V V LINE REGULATION -.85 Note I O =, = 4.5 to V 7 mv -3 Note I O =, = 4.5 to V 7 mv -3.3 Note I O =, = 4.8 to V 7 mv -5 Note I O =, = 6.5 to 5V 3 mv (Adjustable) Note I O = ma, V O =.5 to 3.75V..4 % A (Adjustable) Note I O = ma, V O =.5 to 3.75V..4 % LOAD REGULATION -.85 Note I O = to 8mA, = 4.5V mv -3 Note I O = to 8mA, = 4.5V mv -3.3 Note I O = to 8mA, = 4.8V 3 mv -5 Note I O = to 8mA, = 6.5V 3 5 mv (Adjustable) Note, I O = to 8mA, V O = 3V..4 % A (Adjustable) Note, I O = ma to A, V O = 3V..4 % DROPOUT VOLTAGE Note 3 All Models Note I O = ma.. V Note I O = 5mA.5.5 V Models Note I O = 8mA.. V A I O = A..3 V Note I O = A..55 V CURRENT LIMIT Models V O = 5V 8 95 ma A V O = 5V 5 6 ma MINIMUM LOAD CURRENT Adjustable Models Note, V O = 3.75V.7 5 ma QUIESCENT CURRENT Fixed-Voltage Models Note V O = 5V 4 ma Adjust Pin Current Note, I O = ma, V O =.4 to V 5 µa vs Load Current, Note I O = ma to 8mA, V O =.4 to V.5 5 µa vs Load Current, A Note I O = ma to A, V O =.4 to V.5 5 µa THERMAL REGULATION All Models Note 4 3ms Pulse.. %/W RIPPLE REJECTION All Models f = Hz, V OUT = 3V+V PP Ripple 6 db TEMPERATURE DRIFT Fixed-Voltage Models T J = C to +5 C.5 % Adjustable Models T J = C to +5 C % LONG-TERM STABILITY All Models T A = +5 C, Hr.3 % OUTPUT NOISE RMS noise All Models f = Hz to khz.3 % THERMAL RESISTANCE Operating Junction Temperature Range +5 C Storage Range C Thermal Resistance, θ JC 3-Lead SOT-3 Surface-Mount (Junction-to-Case at Tab) 5 C/W NOTES: () Specification applies over the full operating Junction temperature range, C to 5 C. () and A adjustable versions require a minimum load current for ±3% regulation. (3) Dropout voltage is the put voltage minus output voltage that produces a % decrease in output voltage. (4) Percentage change in unloaded output voltage before vs after a 3ms power pulse of I O = 8mA ( models), I O = A (A), V O =.4V (Reading taken ms after pulse).
3 ABSOLUTE MAXIMUM RATINGS Power Dissipation... ternally Limited put Voltage... 5V Operating Junction Temperature Range... C to +5 C Storage Temperature Range... 4 C to +5 C Lead Temperature (soldering, s) () C NOTE: () See Soldering Methods. CONNECTION DIAGRAM Front View FRONT VIEW SOT-3 ORDERING INFORMATION PRODUCT () PART MARKING PACKAGE 8mA Current -.85 BB7 Plastic SOT-3-3 BB73 Plastic SOT BB74 Plastic SOT-3-5 BB75 Plastic SOT-3 BB7 Plastic SOT-3 A Current A BB7A Plastic SOT-3 NOTE: () Available in Tape and Reel, add TR to Model Number. PACKAGE INFORMATION Ground (Adj.) () V OUT Tab is V OUT NOTE: () Adjustable-Voltage Model. Plastic SOT-3 PACKAGE DRAWING PRODUCT PACKAGE NUMBER () 8mA Current -.85 Plastic SOT Plastic SOT Plastic SOT Plastic SOT-3 3 Plastic SOT-3 3 A Current A Plastic SOT-3 3 NOTE: () For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. SIMPLIFIED SCHEMATIC + Current Limit Thermal Limit X V OUT (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
4 TYPICAL PERFORMANCE CURVE At T J = +5 C, unless otherwise specified. 4 SHORT-CIRCUIT CURRENT vs TEMPERATURE LOAD REGULATION I LOAD = 8mA Short-Circuit Current (ma) 3 9 A Models put Voltage Deviation (mv) put Voltage Change (mv) LINE REGULATION vs TEMPERATURE = 6.5V to 5V = 4.5V to V Ripple Rejection (db) RIPPLE REJECTION vs FREQUENCY k k k Frequency (Hz) I OUT = ma V RIPPLE =.Vp-p. OUTPUT VOLTAGE vs TEMPERATURE 8 QUIESCENT CURRENT vs TEMPERATURE put Voltage Change (%).. Quiescent Current (ma) Fixed-Voltage Models
5 TYPICAL PERFORMANCE CURVE (CONT) At T J = +5 C, unless otherwise specified. put Voltage Deviations (V) Load Current (A) LOAD TRANSIENT RESPONSE 4 6 Time (µs) 8 C IN = µf C OUT = µf Tantalum = 4.5V Preload =.A put Voltage Deviation (mv) put Voltage (V) LINE TRANSIENT RESPONSE C IN = µf C OUT = µf Tantalum I OUT =.A Time (µs) APPLICATIONS INFORMATION Figure 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 µf tantalum capacitor is recommended. Aluminum electrolytic types of 5µF or greater can also be used. A high quality capacitor should be used to assure that the ESR (effective series resistance) is less than.5ω. Figure 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. For best load regulation, connect R close to the output pin and R close to the ground side of the load as shown. µf Tantalum V O + + µf Tantalum THERMAL CONSIDERATIONS The has current limit and thermal shutdown circuits that protect it from overload. The thermal shutdown activates at approximately T J = 65 C. For continuous operation, however, the junction temperature should not be allowed to exceed 5 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: P D = ( V OUT ) I OUT The junction temperature can be calculated by: T J = T A + P D (θ JA ) where T A is the ambient temperature, and θ JA is the junction-to-ambient thermal resistance The 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 FIGURE. Fixed-Voltage Model Basic Connections. 3 (Adj) V O C + + C µf R µf C () 3 + µf R Load R + R V O = (.5V) + (5µA) (R ) R This term is negligible with proper choice of values see table at right. V OUT (V) R (Ω) () R (Ω) ().5 Open Short NOTE: () C 3 optional. Improves high-frequency line rejection. () Resistors are standard % values. FIGURE. Adjustable-Voltage Model Basic Connections. 5
6 Total Area: 5 x 5mm 35 x 7 mm SOLDERING METHODS The 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. 6 x mm 6 x mm Without back-side copper: θ JA 59 C/W With solid back-side copper: θ JA 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 θ JA for various circuit board and copper areas. Nearby heat dissipating components, circuit board mounting conditions and ventilation can dramatically affect the actual θ JA. A simple experiment will determine whether the maximum recommended junction temperature is exceeded in an actual circuit board and mounting configuration: crease the ambient temperature above that expected in normal operation until the device s thermal shutdown is activated. If this occurs at more than 4 C above the maximum expected ambient temperature, then the T J will be less than 5 C during normal operation. TOPSIDE () BACKSIDE TOTAL PC BOARD COPPER COPPER THERMAL RESISTANCE AREA AREA AREA JUNCTION-TO-AMBIENT 5mm 5mm 5mm 46 C/W 5mm 5mm 5mm 47 C/W 5mm 95mm 5mm 49 C/W 5mm 5mm 5 C/W 5mm 8mm 53 C/W 6mm 6mm 6mm 55 C/W 5mm 5mm 58 C/W 5mm 95mm 59 C/W 6mm 6mm 67 C/W 9mm 34mm 9mm 7 C/W 9mm 34mm 85 C/W NOTE: () Tab is attached to the topside copper. TABLE I. INSPEC Abstract Number: B9764, C967 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, 99, Atlantic City, NJ, USA. Abstract Publisher: IC Manage, 99, Chicago, IL, USA. 5V TERMPWR TERMPWR 5V N V Ω Ω.85V -.85 N587 µf µf µf µf (Up to 7 Lines) Ω Ω FIGURE 4. SCSI Active Termination Configuration. -5 > V 5V to V µf + GND + µf -5 > 9.V 7.5V µf + GND + µf µf + kω.5v OUT REF4-.5 FIGURE 5. Adjusting put of Fixed Voltage Models. FIGURE 6. Regulator with Reference. 6
7 -5 5.V Line 5.V Battery + µf GND 5Ω kω V + GND + µf µf FIGURE 7. Battery Backed-Up Regulated Supply. -5 µf + GND + µf Floating put V OUT = 5V FIGURE 8. Low Dropout Negative Supply. 7
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