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| SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR The SI-3018LSA is designed to meet the requirement for increased integration and reliability in low-voltage, high-current, linear regulator applications such as personnel computers (PCs) and set-top boxes. Each device incorporates a monolithic low-level reference and control circuit with a high-current pnp transistor in a power multi-chip module (PMCMTM). Regulated output voltages of 2.5 V or 3.3 V are also available. The high-current pass element provides a low dropout voltage with output current to 1 A. Regulator accuracy of 2 % and excellent temperature characteristics are provided. The logic-compatible ENABLE input gives the designer complete control over power up, power down, and standby or sleep. These devices are supplied in a fully molded 8-lead miniature surface-mount package (tape and reel) with enhanced power-dissipating qualities. They are rated for continuous operation between -30C and +100C. Data Sheet 27468.18 IN INTERNAL CONNECTION SUPPLY ENABLE 1 2 3 4 8 OUT OUT GND GND IC VR VS SUB 7 6 5 Dwg. PK-012 ABSOLUTE MAXIMUM RATINGS Input Voltage, VI ................................ 16 V Supply Voltage, VS ............................ 16 V Continuous Output Current, IO ........ 1.0 A* Logic Input Voltage, VE ......................... VS Package Power Dissipation, PD ........................................ See Graph Output Junction Temperature, TJ ............................................ +150C Operating Temperature Range, TA ............................... -30C to +100C Storage Temperature Range, Tstg ............................. -30C to +150C * Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of 150C. Fault conditions that produce excessive junction temperature will activate the device's thermal protection circuitry. These conditions can be tolerated but should be avoided. FEATURES s s s s s s 1 A Output Current Low Dropout voltage LSTTL/CMOS-Compatible On/Off Control Less Than 1 A "Sleep" Current Internal Foldback Overcurrent Limiting Internal Thermal Protection Surface-Mount Package Always order by complete part number: SI-3018LSA-TL , where "-TL" indicates tape and reel. TM SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR INPUT 1 INTERNAL CONNECTION 2 FUNCTIONAL BLOCK DIAGRAM 8 OUTPUT SUPPLY 3 THERMAL PROTECTION 7 OUTPUT SUB + ENABLE 4 GROUND 5 6 GROUND Dwg. FK-019 1.5 ALLOWABLE PACKAGE POWER DISSIPATION in WATTS 56.5 mm x 56.5 mm COPPER AREA ON GLASS-EPOXY BOARD Leads 7 and 8 are soldered to the copper area and provide heat sinking of the pass transistor. 1.0 40 mm x 40 mm COPPER AREA ON GLASS-EPOXY BOARD 28 mm x 28 mm COPPER AREA ON GLASS-EPOXY BOARD 0.5 20 mm x 20 mm COPPER AREA ON GLASS-EPOXY BOARD RECOMMENDED OPERATING CONDITIONS Max. Input Voltage, VI ................................................ 3.5 V Output Current, IO .......................................... 0 A to 1.0 A Output Junction Temperature Range, TJ -20 C to +125C Ambient Temperature Range, TA .............. -30C to +85C 0 0 20 80 40 60 AMBIENT TEMPERATURE in C 100 120 140 Dwg. GK-010-1 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2001 Allegro MicroSystems, Inc. TM SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR ELECTRICAL CHARACTERISTICS at TA = +25C, VI = VS = 3.3 V, VE = 2.0 V (unless otherwise noted). Limits Characteristic Output Voltage Symbol VO VOQ Output Volt. Temp. Coeff. Overcurrent Limit Line Regulation Load Regulation Dropout Voltage Ground Terminal Current aVO IOM VO(VI) VO(IO) VImin - VO IGND IQ Rejection Ratio ENABLE Input Voltage PSRR VEH VEL ENABLE Input Current IEH IEL Thermal Protection Temp. Thermal Resistance TJ RJL To terminals 7 and 8 Test Conditions IO = 500 mA VE = 0 V, Output Off IO = 5 mA, 0C TJ 100C VO = 95% of VO at IO = 500 mA 3.1 V VI = VS 3.5 V, IO = 300 mA 0 IO 1 A IO 1 A IO = 0 mA VE = 0 V, IO = 0 mA 100 Hz f 120 Hz Output On Output Off VE = 2 V, Output On VE = 0 V, Output Off 135 30 0 150 36 2.0 0.8 80 -5.0 60 1.2 0.3 1.5 2.0 10 0.55 1.7 10 20 1.2 2.5 1.0 Min. 1.764 Typ. 1.800 Max. 1.836 0.5 Units V V mV/C A mV mV V mA A dB V V A A C C/W Typical values are at TA = +25C and are given for circuit design information only. www.allegromicro.com 3 SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR TYPICAL CHARACTERISTICS at TA = 25C Dropout voltage 0.6 1.86 Load regulation 0.5 1.84 DROPOUT VOLTAGE OUTPUT VOLTAGE 0.4 1.82 0.3 1.80 VI = VS = 8 V 1.78 VI = VS = 5 V VI = VS = 3.2 V 0.2 0.1 1.76 0 0 0.2 0.4 0.6 0.8 1.0 1.2 Dwg. GK-025 1.74 0 0.2 0.4 0.6 0.8 1.0 1.2 Dwg. GK-026 OUTPUT CURRENT in AMPERES OUTPUT CURRENT in AMPERES Overcurrent protection 2.0 2.0 VOUT vs VIN VI = VS = 3.2 V 1.5 VI = VS = 5 V VI = VS = 6 V 1.5 IO = 0 A OUTPUT VOLTAGE OUTPUT VOLTAGE IO = 0.5 A 1.0 IO = 1 A 1.0 0.5 0.5 0 0 0.5 1.0 1.5 2.0 Dwg. GK-027 0 0 1.0 2.0 3.0 4.0 5.0 Dwg. GK-028 OUTPUT CURRENT in AMPERES INPUT VOLTAGE 4 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR TYPICAL CHARACTERISTICS at TA = 25C (cont'd) Line regulation 1.86 20 GND current 1.84 15 GROUND CURRENT in mA OUTPUT VOLTAGE 1.82 IO = 1 A IO = 0.5 A 10 IO = 0 A 1.80 IO = 1 A 1.78 IO = 0.5 A IO = 0 A 1.76 5.0 1.74 0 2.0 4.0 6.0 8.0 10 12 Dwg. GK-029 0 0 2.0 4.0 6.0 8.0 10 12 Dwg. GK-030 INPUT VOLTAGE INPUT VOLTAGE ENABLE input current 60 50 VI = VS = 3.3 V IO = 5 mA ENABLE INPUT CURRENT in A 40 30 20 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 Dwg. GK-023 ENABLE VOLTAGE in VOLTS www.allegromicro.com 5 SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR APPLICATIONS INFORMATION Thermal protection and heat sinking. Thermal protection circuitry turns off the device should the junction temperature rise above 135C. This is intended only to protect the device from failures due to excessive junction temperatures and should not imply that high-temperature operation is permitted. Ambient temperature is affected by air circulation and proximity to other heat-producing components. Normal operation is resumed when the junction temperature is reduced. Output terminals 7 and 8 are the lead frame and substrate of the pass transistor and provide a low thermal-resistance path for heat sinking. In general, the maximum ambient temperature has the most effect on determining the heat sinking that is needed to maintain a safe normal operating junction temperature. The maximum heat sinking thermal resistance (RJA) can be calculated as RJA = (135 - TA) / IO (VI - 1.8) where TA is the maximum ambient temperature in C, IO is the maximum output (load) current in amperes, and VI is the maximum input voltage in volts. The following graph gives the required copper foil area (soldered to leads 7 and 8) to provide the required thermal resistance. Note that more is always better and both sides of the printed wiring board can be used. ENABLE input. The ENABLE input includes an internal pull2000 GLASS-EPOXY PRINTED WIRING BOARD 1000 down resistor. If this terminal is not connected (open-circuit fault), the device output is turned off. Overcurrent protection. The SI-3018LSA includes an overcurrent protection circuit, which limits the output current at start up. It thus cannot be used with 1) a constant-current load, 2) a power supply with positive and negative to a common load (center-tap type power supply), 3) a series power supply, or 4) a diode or resistor in series with the device ground to raise the output voltage. Input voltage. Including ripple voltage and transients, the minimum input voltage should be greater than the sum of the output voltage and the maximum rated dropout voltage; the maximum input voltage must be less than the absolute maximum rated input voltage (16 V). In most applications, the input voltage (terminal 1, VI) and the supply voltage (terminal 3, VS) are connected together. Output capacitor. A 22 F tantalum electrolytic capacitor is recommended between the output and ground. Very-low ESR capacitors should not be used. Input capacitor. A 0.1 F to 10 F tantalum capacitor is recommended between the input and ground to prevent oscillation. FOIL AREA in SQ. mm 500 300 200 100 90 100 110 120 130 Dwg. GK-031 JUNCTION-TO-AMBIENT THERMAL RESISTANCE in C/W 6 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR Dimensions in Millimeters (controlling dimensions) 8 7 6 5 0.25 0.10 0.2 4.4 0.3 0.1 6.2 0.5 0.1 0.4 1 0.4 1.27 BSC 0 TO 10 5.1 1.55 0.15 0.10 MAX. Dwg. MK-006-8 mm NOTES: 1. Exact body and lead configuration at vendor's option within limits shown. 2. Lead spacing tolerance is non-cumulative. 3. Leads 7 and 8 are internally connected together and provide heat sinking of the pass transistor. www.allegromicro.com 7 SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR Tape and Reel Dimensions in Millimeters (controlling dimensions) 1.55 CENTER LINES OF CAVITY 0.7 4.0 0.3 2.5 2.0 5.5 8.0 COVER TAPE USER DIRECTION OF UNREELING 2.0 Dwg. MA-015-1 ACCESS HOLE 2.0 15.4 1.0 (MEASURED AT HUB) 180 13 0.2 60 13.0 0.3 (MEASURED AT HUB) TAPE SLOT IN CORE FOR TAPE START Dwg. MA-018-1 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM 8 10.25 12.0 5.6 SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR The products described herein are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. Sanken and Allegro reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Therefore, the user is cautioned to verify that the information in this publication is current before placing any order. When using the products described herein, the applicability and suitability of such products for the intended purpose shall be reviewed at the users responsibility. Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to society due to device failure or malfunction. Sanken products listed in this publication are designed and intended for use as components in general-purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). Their use in any application requiring radiation hardness assurance (e.g., aerospace equipment) is not supported. When considering the use of Sanken products in applications where higher reliability is required (transportation equipment and its control systems or equipment, fire- or burglar-alarm systems, various safety devices, etc.), contact a Sanken sales representative to discuss and obtain written confirmation of your specifications. The use of Sanken products without the written consent of Sanken in applications where extremely high reliability is required (aerospace equipment, nuclear powercontrol stations, life-support systems, etc.) is strictly prohibited. The information included herein is believed to be accurate and reliable. Application and operation examples described in this publication are given for reference only and Sanken and Allegro assume no responsibility for any infringement of industrial property rights, intellectual property rights, or any other rights of Sanken or Allegro or any third party that may result from its use. www.allegromicro.com 9 SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR LINEAR REGULATORS IN ORDER OF 1) OUTPUT VOLTAGE AND 2) OUTPUT CURRENT VO 1.8 V 2.5 V 3.3 V 3.3 V 5.0 V 5.0 V * 5.0 V 5.0 V 5.0 V 7.7 V 9.0 V 9.0 V * 9.0 V 9.0 V 12 V 12 V * 12 V 12 V 12 V 15 V 15 V 15 V 15 V 15.7 V 24 V 24 V Max IO 1.0 A 1.0 A 1.0 A 1.5 A 1.0 A 1.5 A 1.5 A 1.5 A 2.0 A 15 mA 1.0 A 1.5 A 1.5 A 1.5 A 1.0 A 1.5 A 1.5 A 1.5 A 2.0 A 1.0 A 1.5 A 1.5 A 2.0 A 1.0 A 1.5 A 1.5 A Max DC In 16 V 16 V 16 V 20 V 25 V 35 V 35 V 35 V 25 V 30 V 30 V 35 V 35 V 35 V 30 V 35 V 35 V 35 V 30 V 35 V 35 V 35 V 30 V 35 V 45 V 45 V Max. Dropout Voltage 1.2 V @ 1.0 A 800 mV @ 1.0 A 800 mV @ 1.0 A 500 mV @ 1.0 A 500 mV @ 0.5 A 1.0 V @ 1.5 A 500 mV @ 1.0 A 500 mV @ 1.0 A 500 mV @ 1.0 A -- 500 mV @ 0.5 A 1.0 V @ 1.5 A 500 mV @ 1.0 A 500 mV @ 1.0 A 500 mV @ 0.5 A 1.0 V @ 1.5 A 500 mV @ 1.0 A 500 mV @ 1.0 A 500 mV @ 1.0 A 500 mV @ 0.5 A 500 mV @ 1.0 A 500 mV @ 1.0 A 500 mV @ 1.0 A 1.0 V @ 1.0 A 500 mV @ 1.0 A 500 mV @ 1.0 A Part Number SI-3018LSA SI-3025LSA SI-3033LSA SI-3033C SI-3050N SLA3001M SI-3050C SI-3051N SI-3052V A8178LLT SI-3090N SLA3001M SI-3090C SI-3091N SI-3120N SLA3001M SI-3120C SI-3121N SI-3122V SI-3150N SI-3150C SI-3151N SI-3152V SLA3002M SI-3240C SI-3241N Package 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 5-Lead TO-220 TO-220 Power-Tab SIP 5-Lead TO-220 TO-220 TO-3P SOT-89 TO-220 Power-Tab SIP 5-Lead TO-220 TO-220 TO-220 Power-Tab SIP 5-Lead TO-220 TO-220 TO-3P TO-220 5-Lead TO-220 TO-220 TO-3P Power-Tab SIP 5-Lead TO-220 TO-220 * Three outputs, one each at 5 V, 9 V, and 12 V. Also includes two switching regulator outputs for 5 V at 500 mA and 9 V at 400 mA. Also, see 83145 and 84145 Latched, Universal Input-Voltage Switches. 10 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM |
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