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Data Sheet
27468.18*
Linear
Regulators
1
IN
INTERNAL
CONNECTION
SUPPLY GND
ENABLE
IC
2
S
V
3
45
VR
ABSOLUTE MAXIMUM RATINGS
8
7
SUB
6
Dwg. PK-012
OUT
OUT
GND
SI-
3018
LSA
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 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
+100°C.
Input Voltage, VI................................ 16 V
Supply Voltage, VS............................ 16 V
Continuous Output Current, IO........ 1.0 A*
Logic Input Voltage, VE......................... V
Package Power Dissipation,
PD........................................ See Graph
Output Junction Temperature,
TJ............................................ +150°C†
Operating Temperature Range,
TA............................... -30°C to +100°C
Storage Temperature Range,
T
............................. -30°C to +150°C
stg
* 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
■ 1 A Output Current
S
■ 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.
Sanken Power Devices
from Allegro MicroSystems
™
SI-3018LSA
LOW-VOLTAGE, HIGH-CURRENT
1.8 V LINEAR REGULATOR
FUNCTIONAL BLOCK DIAGRAM
INPUT
1
Linear
Regulators
INTERNAL
CONNECTION
SUPPLY
ENABLE
2
3
SUB
+
THERMAL
PROTECTION
4
5
OUTPUT
8
OUTPUT
7
GROUNDGROUND
6
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
Linear
Regulators
SI-3018LSA
LOW-VOLTAGE, HIGH-CURRENT
1.8 V LINEAR REGULATOR
ELECTRICAL CHARACTERISTICS at T
= +25°C, V
A
= VS = 3.3 V, VE = 2.0 V (unless otherwise
I
noted).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Output Voltage V
Output Volt. Temp. Coeff. a
Overcurrent Limit I
Line Regulation ∆V
Load Regulation ∆V
Dropout Voltage VImin - VOIO ≤ 1 A — 0.55 1.2 V
Ground Terminal Current I
Rejection Ratio PSRR 100 Hz ≤ f ≤ 120 Hz — 60 — dB
ENABLE Input Voltage V
V
OQ
VO
OM
O(∆VI)
O(∆IO)
GND
I
Q
EH
O
IO = 500 mA 1.764 1.800 1.836 V
VE = 0 V, Output Off — — 0.5 V
IO = 5 mA, 0°C ≤ TJ ≤ 100°C—±0.3 — mV/°C
VO = 95% of VO at IO = 500 mA 1.2 1.5 — A
3.1 V ≤ VI = VS ≤ 3.5 V, IO = 300 mA — 2.0 10 mV
0 ≤ IO ≤ 1 A — 10 20 mV
IO = 0 mA — 1.7 2.5 mA
VE = 0 V, IO = 0 mA — — 1.0 µA
Output On 2.0 — — V
V
ENABLE Input Current I
Thermal Protection Temp. T
Thermal Resistance R
Typical values are at T
= +25°C and are given for circuit design information only.
A
EL
EH
I
EL
J
θJL
Output Off — — 0.8 V
VE = 2 V, Output On — 30 80 µA
VE = 0 V, Output Off — 0 -5.0 µA
135 150 — °C
To terminals 7 and 8 — 36 — °C/W
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3
SI-3018LSA
LOW-VOLTAGE, HIGH-CURRENT
1.8 V LINEAR REGULATOR
TYPICAL CHARACTERISTICS at TA = 25°C
Dropout voltage Load regulation
0.6
Linear
Regulators
1.86
0.5
0.4
0.3
0.2
DROPOUT VOLTAGE
0.1
0
0
Overcurrent protection V
2.0
1.5
1.0
0.4 0.8
OUTPUT CURRENT in AMPERES
VI = VS = 3.2 V
V
I
= VS = 5 V
V
I
= VS = 6 V
1.20.6 1.00.2
Dwg. GK-025
1.84
1.82
1.80
1.78
OUTPUT VOLTAGE
1.76
1.74
0
2.0
1.5
IO = 0 A
I
O
= 0.5 A
I
O
1.0
= 1 A
0.4 0.8
OUTPUT CURRENT in AMPERES
vs V
OUT
IN
VI = VS = 8 V
V
I
= VS = 5 V
V
I
= VS = 3.2 V
1.20.6 1.00.2
Dwg. GK-026
OUTPUT VOLTAGE
0.5
0
0
4
OUTPUT CURRENT in AMPERES
OUTPUT VOLTAGE
0.5
0
2.01.0 1.50.5
Dwg. GK-027
0
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2.0
INPUT VOLTAGE
5.03.0 4.01.0
Dwg. GK-028
TM
Linear
Regulators
1.86
1.84
1.82
1.80
1.78
OUTPUT VOLTAGE
1.76
LOW-VOLTAGE, HIGH-CURRENT
1.8 V LINEAR REGULATOR
TYPICAL CHARACTERISTICS at TA = 25°C (cont’d)
Line regulation GND current
20
15
10
IO = 1 A
I
O = 0.5 A
I
O = 0 A
5.0
GROUND CURRENT in mA
SI-3018LSA
IO = 1 A
I
O
= 0.5 A
I
O
= 0 A
1.74
0
0
4.0 8.0
INPUT VOLTAGE
126.0 102.0
Dwg. GK-029
0
4.0 8.0
INPUT VOLTAGE
126.0 102.0
Dwg. GK-030
ENABLE input current
60
50
A
µµ
40
30
20
ENABLE INPUT CURRENT in µµ
10
0
0
VI = VS = 3.3 V
O = 5 mA
I
1.0 2.0
ENABLE VOLTAGE in VOLTS
1.5 2.50.5
3.0
Dwg. GK-023
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5
SI-3018LSA
LOW-VOLTAGE, HIGH-CURRENT
1.8 V LINEAR REGULATOR
APPLICATIONS INFORMATION
Linear
Regulators
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 (R
R
= (135 – TA) / IO (VI – 1.8)
θJA
) can be calculated as
θJA
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.
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.
ENABLE input. The ENABLE input includes an internal pull-
2000
GLASS-EPOXY
PRINTED WIRING BOARD
1000
500
300
FOIL AREA in SQ. mm
200
100
90
JUNCTION-TO-AMBIENT THERMAL RESISTANCE in °°°°C/W
6
130110 120100
Dwg. GK-031
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Input capacitor. A 0.1 µF to 10 µF tantalum capacitor is
recommended between the input and ground to prevent oscillation.
TM
Linear
Regulators
SI-3018LSA
LOW-VOLTAGE, HIGH-CURRENT
1.8 V LINEAR REGULATOR
Dimensions in Millimeters
(controlling dimensions)
4.4
±0.2
0.4
±0.1
1.55
±0.15
8
1
0.10
5.1
±0.4
MAX.
576
6.2
±0.3
1.27
BSC
0° TO 10°
Dwg. MK-006-8 mm
0.25
0.10
0.5
±0.1
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
(controlling dimensions)
Linear
Regulators
0.3
2.5
CENTER LINES
OF CAVITY
COVER TAPE
2.0
1.55
8.0
USER DIRECTION OF UNREELING
4.0
0.7
2.0
5.6
5.5
10.25
Dwg. MA-015-1
12.0
ACCESS
HOLE
2.0
180
TAPE SLOT
IN CORE
FOR TAPE
START
8
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
13 ± 0.2 60
15.4 ± 1.0
(MEASURED AT HUB
13.0 ± 0.3
(MEASURED AT HUB
Dwg. MA-018-1
TM
LOW-VOLTAGE, HIGH-CURRENT
Linear
Regulators
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.
SI-3018LSA
1.8 V LINEAR REGULATOR
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
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