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
V
S
SUB
7
6
5
Dwg. PK-012
ABSOLUTE MAXIMUM RATINGS
Input Voltage, V
I
................................
16 V
Supply Voltage, V
S
............................
16 V
Continuous Output Current, I
O
........
1.0 A*
Logic Input Voltage, V
E
.........................
V
S
Package Power Dissipation,
P
D
........................................
See Graph
Output Junction Temperature,
T
J
............................................
+150
°
C†
Operating Temperature Range,
T
A
...............................
-30
°
C to +100
°
C
Storage Temperature Range,
T
stg
.............................
-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 transis-
tor.
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, V
I
................................................
3.5 V
Output Current, I
O
..........................................
0 A to 1.0 A
Output Junction Temperature Range, T
J
-20
°
C to +125
°
C
Ambient Temperature Range, T
A
..............
-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
TYPICAL CHARACTERISTICS at T
A
= 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
V
I
= V
S
= 8 V
1.78
V
I
= V
S
= 5 V
V
I
= V
S
= 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
Overcurrent protection
2.0
2.0
V
OUT
vs V
IN
V
I
= V
S
= 3.2 V
1.5
V
I
= V
S
= 5 V
V
I
= V
S
= 6 V
1.5
I
O
= 0 A
OUTPUT VOLTAGE
OUTPUT VOLTAGE
I
O
= 0.5 A
1.0
I
O
= 1 A
1.0
0.5
0.5
0
0
0.5
1.0
1.5
2.0
Dwg. GK-027
0
0
1.0
2.0
3.0
4.0
5.0
Dwg. GK-028
OUTPUT CURRENT in AMPERES
INPUT VOLTAGE
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TM
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