ALLEGRO SI

Data Sheet
27468.18
SI-3018LSA
LOW-VOLTAGE, HIGH-CURRENT
1.8 V LINEAR REGULATOR
IN
1
INTERNAL
CONNECTION
2
SUPPLY
3
ENABLE
4
IC
VR
VS
8
OUT
7
OUT
6
GND
5
GND
SUB
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
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.
FEATURES
■
■
■
■
■
■
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
* 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.
TM
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
ALLOWABLE PACKAGE POWER DISSIPATION in WATTS
1.5
Leads 7 and 8 are soldered to
the copper area and provide
heat sinking of the pass transistor.
56.5 mm x 56.5 mm
COPPER AREA ON
GLASS-EPOXY BOARD
1.0
40 mm x 40 mm
COPPER AREA ON
GLASS-EPOXY BOARD
28 mm x 28 mm
COPPER AREA ON
GLASS-EPOXY BOARD
RECOMMENDED OPERATING CONDITIONS
0.5
20 mm x 20 mm
COPPER AREA ON
GLASS-EPOXY BOARD
0
0
20
80
40
60
AMBIENT TEMPERATURE in ° C
100
120
140
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
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
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.
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3
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
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
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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 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
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.
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7
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
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.
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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
Max IO
Max DC In
Max. Dropout Voltage
Part
Number
Package
1.8 V
1.0 A
16 V
1.2 V @ 1.0 A
SI-3018LSA
8-Lead SOIC
2.5 V
1.0 A
16 V
800 mV @ 1.0 A
SI-3025LSA
8-Lead SOIC
3.3 V
1.0 A
16 V
800 mV @ 1.0 A
SI-3033LSA
8-Lead SOIC
3.3 V
1.5 A
20 V
500 mV @ 1.0 A
SI-3033C
5-Lead TO-220
5.0 V
1.0 A
25 V
500 mV @ 0.5 A
SI-3050N
TO-220
5.0 V *
1.5 A
35 V
1.0 V @ 1.5 A
SLA3001M
Power-Tab SIP
5.0 V
1.5 A
35 V
500 mV @ 1.0 A
SI-3050C
5-Lead TO-220
5.0 V
1.5 A
35 V
500 mV @ 1.0 A
SI-3051N
TO-220
5.0 V
2.0 A
25 V
500 mV @ 1.0 A
SI-3052V
TO-3P
7.7 V
15 mA
30 V
–
A8178LLT
SOT-89
9.0 V
1.0 A
30 V
500 mV @ 0.5 A
SI-3090N
TO-220
9.0 V *
1.5 A
35 V
1.0 V @ 1.5 A
SLA3001M
Power-Tab SIP
9.0 V
1.5 A
35 V
500 mV @ 1.0 A
SI-3090C
5-Lead TO-220
9.0 V
1.5 A
35 V
500 mV @ 1.0 A
SI-3091N
TO-220
12 V
1.0 A
30 V
500 mV @ 0.5 A
SI-3120N
TO-220
12 V *
1.5 A
35 V
1.0 V @ 1.5 A
SLA3001M
Power-Tab SIP
12 V
1.5 A
35 V
500 mV @ 1.0 A
SI-3120C
5-Lead TO-220
12 V
1.5 A
35 V
500 mV @ 1.0 A
SI-3121N
TO-220
12 V
2.0 A
30 V
500 mV @ 1.0 A
SI-3122V
TO-3P
15 V
1.0 A
35 V
500 mV @ 0.5 A
SI-3150N
TO-220
15 V
1.5 A
35 V
500 mV @ 1.0 A
SI-3150C
5-Lead TO-220
15 V
1.5 A
35 V
500 mV @ 1.0 A
SI-3151N
TO-220
15 V
2.0 A
30 V
500 mV @ 1.0 A
SI-3152V
TO-3P
15.7 V †
1.0 A
35 V
1.0 V @ 1.0 A
SLA3002M
Power-Tab SIP
24 V
1.5 A
45 V
500 mV @ 1.0 A
SI-3240C
5-Lead TO-220
24 V
1.5 A
45 V
500 mV @ 1.0 A
SI-3241N
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