SI-3025LSA-TL [ALLEGRO]
LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR; 低电压，高电流1.8 V线性稳压器
| 型号： | SI-3025LSA-TL |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | LOW-VOLTAGE, HIGH-CURRENT 1.8 V LINEAR REGULATOR |
| 文件： | 总9页 (文件大小：169K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
IN
1
2
3
4
8
7
6
5
OUT
OUT
GND
GND
INTERNAL
CONNECTION
IC
VR
SUB
SUPPLY
ENABLE
VS
Dwg. PK-012
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.
ABSOLUTE MAXIMUM RATINGS
FEATURES
Input Voltage, VI ................................ 16 V
Supply Voltage, VS ............................ 16 V
Continuous Output Current, IO ........ 1.0 A*
Logic Input Voltage, VE ......................... VS
■ 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
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.
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
INTERNAL
CONNECTION
OUTPUT
OUTPUT
2
8
7
SUPPLY
3
SUB
+
ENABLE
4
GROUND
GROUND
5
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.
TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
Copyright © 2001, 2005 Allegro MicroSystems, Inc.
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
VO
Test Conditions
Min.
1.764
—
Typ.
1.800
—
Max.
1.836
0.5
—
Units
V
Output Voltage
IO = 500 mA
VOQ
VE = 0 V, Output Off
V
Output Volt. Temp. Coeff.
Overcurrent Limit
aVO
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
—
±0.3
1.5
2.0
10
mV/°C
A
IOM
1.2
—
—
Line Regulation
∆VO(∆VI)
∆VO(∆IO)
VImin - VO
IGND
10
mV
mV
V
Load Regulation
—
20
Dropout Voltage
I
O ≤ 1 A
—
0.55
1.7
—
1.2
2.5
1.0
—
Ground Terminal Current
IO = 0 mA
—
mA
µA
dB
V
IQ
VE = 0 V, IO = 0 mA
100 Hz ≤ f ≤ 120 Hz
Output On
—
Rejection Ratio
PSRR
VEH
—
60
ENABLE Input Voltage
2.0
—
—
—
VEL
Output Off
—
0.8
80
V
ENABLE Input Current
IEH
VE = 2 V, Output On
VE = 0 V, Output Off
—
30
µA
µA
°C
IEL
—
0
-5.0
—
Thermal Protection Temp.
Thermal Resistance
TJ
135
—
150
36
RθJL
To terminals 7 and 8
—
°C/W
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
Dropout voltage
Load regulation
0.6
0.5
0.4
0.3
1.86
1.84
1.82
1.80
VI
VI
VI
= V
= V
= V
S
S
S
= 8 V
1.78
1.76
1.74
0.2
0.1
0
= 5 V
= 3.2 V
0
0.2
0.4
0.6
0.8
1.0
1.2
0
0.2
0.4
0.6
0.8
1.0
1.2
OUTPUT CURRENT in AMPERES
OUTPUT CURRENT in AMPERES
Dwg. GK-026
Dwg. GK-025
Overcurrent protection
V
OUT vs VIN
2.0
1.5
1.0
2.0
VI = VS = 3.2 V
V
I
= V
S
S
= 5 V
= 6 V
1.5
1.0
0.5
0
VI
= V
I
O
= 0 A
I
O
= 0.5 A
= 1 A
IO
0.5
0
0
1.0
2.0
3.0
4.0
5.0
0
0.5
1.0
1.5
2.0
INPUT VOLTAGE
OUTPUT CURRENT in AMPERES
Dwg. GK-028
Dwg. GK-027
TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
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
1.84
20
15
IO
IO
IO
= 1 A
1.82
1.80
= 0.5 A
= 0 A
10
IO = 1 A
IO = 0.5 A
IO = 0 A
1.78
1.76
1.74
5.0
0
0
2.0
4.0
6.0
8.0
10
12
0
2.0
4.0
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
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.
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.
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
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).
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.
In most applications, the input voltage (terminal 1, VI) and
the supply voltage (terminal 3, VS) are connected together.
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.
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-
Input capacitor. A 0.1 µF to 10 µF tantalum capacitor is
recommended between the input and ground to prevent oscilla-
tion.
2000
GLASS-EPOXY
PRINTED WIRING BOARD
1000
500
300
200
100
90
100
110
120
130
°
JUNCTION-TO-AMBIENT THERMAL RESISTANCE in C/W
Dwg. GK-031
TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
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
1
1.27
0° TO 10°
±0.1
BSC
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
(controlling dimensions)
0.3
2.5
CENTER LINES
OF CAVITY
0.7
8.0
COVER TAPE
USER DIRECTION OF UNREELING
Dwg. MA-015-1
ACCESS
HOLE
15.4 ± 1.0
(MEASURED AT HUB
2.0
180
13 ± 0.2
60
13.0 ± 0.3
(MEASURED AT HUB
TAPE SLOT
IN CORE
FOR TAPE
START
Dwg. MA-018-1
TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
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 appli-
ances, office equipment, telecommunication equipment, measuring equipment, etc.).
Their use in any application requiring radiation hardness assurance (e.g., aero-
space 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 equip-
ment, fire- or burglar-alarm systems, various safety devices, etc.), contact a Sanken
sales representative to discuss and obtain written confirmation of your specifica-
tions.
The use of Sanken products without the written consent of Sanken in applications
where extremely high reliability is required (aerospace equipment, nuclear power-
control stations, life-support systems, etc.) is strictly prohibited.
The information included herein is believed to be accurate and reliable. Appli-
cation 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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