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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 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.
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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.