Re L i n gu e a lat r ors Data Sheet 27468.18* SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR IN 1 INTERNAL CONNECTION 2 IC SUPPLY 3 VS ENABLE 4 VR 8 OUT 7 OUT 6 GND 5 GND SUB Dwg. PK-012 The SI-3018LSA is designed to meet the requirement for increased integration and reliability in low-voltage, high-current, linear regulator applications such as personal 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 (PMCM™). Regulated output voltages of 2.5 V or 3.3 V are also available. The high-current pass element provides an 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 -30°C and 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 ............................................ +150°C† Operating Temperature Range, TA ............................... -30°C to +100°C Storage Temperature Range, Tstg ............................. -30°C to +150°C +100°C. FEATURES ■ ■ ■ ■ ■ 1 A Output Current LSTTL/CMOS-Compatible On/Off Control Less Than 1 µA “Sleep” Current Internal Foldback Overcurrent Limiting Internal Thermal Protection Surface-Mount Package * 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 150˚C. † Fault conditions that produce excessive junction temperature will activate the device’s thermal protection circuitry. These conditions can be tolerated but should be avoided. Always order by complete part number: SI-3018LSA-TL , where “-TL” indicates tape and reel. Sanken Power Devices from Allegro MicroSystems ™ Re L i n gu e a lat r ors SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR FUNCTIONAL BLOCK DIAGRAM INPUT 1 2 8 OUTPUT SUPPLY 3 7 OUTPUT 6 GROUND THERMAL PROTECTION INTERNAL CONNECTION ENABLE 4 GROUND 5 SUB + Dwg. FK-019 Leads 7 and 8 are soldered to the copper area and provide heat sinking of the pass transistor. 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 +125°C Ambient Temperature Range, TA .............. -30°C to +85°C For the availability of parts meeting -40°C requirements, contact Allegro’s Sales Representative. This data sheet is based on Sanken data sheet SSJ-01835. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2001, 2005 Allegro MicroSystems, Inc. TM Re L i n gu e a lat r ors SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR ELECTRICAL CHARACTERISTICS at TA = +25°C, VI = VS = 3.3 V, VE = 2.0 V (unless otherwise noted). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Output Voltage VO IO = 500 mA 1.764 1.800 1.836 V VOQ VE = 0 V, Output Off — — 0.5 V Output Volt. Temp. Coeff. aVO IO = 5 mA, 0°C ≤ TJ ≤ 100°C — ±0.3 — mV/°C Overcurrent Limit IOM VO = 95% of VO at IO = 500 mA 1.2 1.5 — A Line Regulation ∆VO(∆VI) 3.1 V ≤ VI = VS ≤ 3.5 V, IO = 300 mA — 2.0 10 mV Load Regulation ∆VO(∆IO) 0 ≤ IO ≤ 1 A — 10 20 mV Dropout Voltage VImin - VO IO ≤ 1 A — 0.55 1.2 V IO = 0 mA — 1.7 2.5 mA IQ VE = 0 V, IO = 0 mA — — 1.0 µA PSRR 100 Hz ≤ f ≤ 120 Hz — 60 — dB VEH Output On 2.0 — — V VEL Output Off — — 0.8 V IEH VE = 2 V, Output On — 30 80 µA IEL VE = 0 V, Output Off — 0 -5.0 µA 135 150 — °C — 36 — °C/W Ground Terminal Current Rejection Ratio ENABLE Input Voltage ENABLE Input Current Thermal Protection Temp. Thermal Resistance IGND TJ RθJL To terminals 7 and 8 Typical values are at TA = +25°C and are given for circuit design information only. www.allegromicro.com 3 Re L i n gu e a lat r ors SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR TYPICAL CHARACTERISTICS at TA = 25°C Load regulation 1.86 0.5 1.84 0.4 1.82 OUTPUT VOLTAGE DROPOUT VOLTAGE Dropout voltage 0.6 0.3 0.2 1.80 VI = VS = 8 V 1.78 VI = VS = 5 V VI = VS = 3.2 V 1.76 0.1 1.74 0 0 0.2 0.4 0.6 1.0 0.8 0 1.2 0.2 0.4 0.8 0.6 1.0 1.2 OUTPUT CURRENT in AMPERES OUTPUT CURRENT in AMPERES Dwg. GK-026 Dwg. GK-025 Overcurrent protection VOUT vs VIN 2.0 2.0 VI = VS = 3.2 V VI = VS = 5 V 1.5 1.5 IO = 0 A OUTPUT VOLTAGE OUTPUT VOLTAGE VI = VS = 6 V 1.0 IO = 0.5 A IO = 1 A 1.0 0.5 0.5 0 0 0 0.5 1.0 1.5 2.0 0 1.0 2.0 3.0 4.0 5.0 INPUT VOLTAGE OUTPUT CURRENT in AMPERES Dwg. GK-028 Dwg. GK-027 4 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM Re L i n gu e a lat r ors SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR TYPICAL CHARACTERISTICS at TA = 25°C (cont’d) Line regulation GND current 1.86 20 1.84 GROUND CURRENT in mA 1.80 IO = 1 A IO = 0.5 A 1.78 IO = 0 A IO = 1 A IO = 0.5 A IO = 0 A 10 5.0 1.76 0 1.74 0 2.0 4.0 6.0 8.0 10 0 12 4.0 2.0 6.0 8.0 10 12 INPUT VOLTAGE INPUT VOLTAGE Dwg. GK-030 Dwg. GK-029 ENABLE input current 60 VI = VS = 3.3 V IO = 5 mA 50 ENABLE INPUT CURRENT in µ A OUTPUT VOLTAGE 15 1.82 40 30 20 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 ENABLE VOLTAGE in VOLTS Dwg. GK-023 www.allegromicro.com 5 Re L i n gu e a lat r ors 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 135°C. 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 (RθJA) can be calculated as RθJA = (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 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 µF tantalum electrolytic capacitor is recommended between the output and ground. Very-low ESR capacitors should not be used. Input capacitor. A 0.1 µF to 10 µF tantalum capacitor is recommended between the input and ground to prevent oscillation. GLASS-EPOXY PRINTED WIRING BOARD FOIL AREA in SQ. mm 1000 500 300 200 100 90 100 110 120 130 JUNCTION-TO-AMBIENT THERMAL RESISTANCE in ° C/W Dwg. GK-031 6 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM Re L i n gu e a lat r ors SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR Dimensions in Millimeters (controlling dimensions) 8 7 6 5 0.25 0.10 4.4 6.2 ±0.2 ±0.3 0.5 ±0.1 0.4 ±0.1 1.27 1 BSC 0° TO 10° 5.1 ±0.4 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 Re L i n gu e a lat r ors SI-3018LSA LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR Tape and Reel Dimensions in Millimeters 1.55 0.3 2.5 4.0 2.0 (controlling dimensions) CENTER LINES OF CAVITY 12.0 10.25 5.6 5.5 0.7 8.0 2.0 COVER TAPE USER DIRECTION OF UNREELING Dwg. MA-015-1 ACCESS HOLE 15.4 ± 1.0 (MEASURED AT HUB 2.0 13 ± 0.2 180 60 13.0 ± 0.3 (MEASURED AT HUB TAPE SLOT IN CORE FOR TAPE START Dwg. MA-018-1 8 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM Re L i n gu e a lat r ors 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