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SI-3018LSA Dataheets PDF



Part Number SI-3018LSA
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description LINEAR REGULATOR
Datasheet SI-3018LSA DatasheetSI-3018LSA Datasheet (PDF)

www.DataSheet4U.com 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 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.

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www.DataSheet4U.com 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 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 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 -30°C and +100°C. 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 ............................................ +150°C† Operating Temperature Range, TA ............................... -30°C to +100°C Storage Temperature Range, Tstg ............................. -30°C to +150°C * 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. FEATURES s s s s s s 1 A Output Current Low Dropout voltage LSTTL/CMOS-Compatible On/Off Control Less Than 1 µA “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 FUNCTIONAL BLOCK DIAGRAM INPUT 1 INTERNAL CONNECTION 2 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 +125°C Ambient Temperature Range, TA .............. -30°C to +85°C 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 © 2001 Allegro MicroSystems, Inc. TM 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 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 RθJL To terminals 7 and 8 Test Conditions IO = 500 mA VE = 0 V, Output Off IO = 5 mA, 0°C ≤ TJ ≤ 100°C 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 Min. 1.764 — — 1.2 — — — — — — 2.0 — — — 135 — Typ. 1.800 — ±0.3 1.5 2.0 10 0.55 1.7 — 60 — — 30 0 150 36 Max. 1.836 0.5 — — 10 20 1.2 2.5 1.0 — — 0.8 80 -5.0 — — Units V V mV/°C A mV mV V mA µA dB V V µA µA °C °C/W Typical values are at TA = +25°C 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 = 25°C 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 Overcurren.


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