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PRELIMINARY ISSUE
g
Subject to change without notice
Re
May 16, 2005
SI-3005KWM
1 A, Low-Dropout, Dual Output, 1.5 V & 1.8 V Regulator
Designed to meet the high-current requirements in industrial and
consumer applications; embedded core, memory, or logic supplies; TVs,
VCRs, and office equipment, the SI-3005KWM voltage regulator offers
the reduced dropout voltage and low quiescent current essential for
improved efficiency. This device delivers dual regulated outputs at up to
1 A. Integrated thermal and overcurrent protection enhance overall
system reliability. Devices with other output voltages are also available.
Quiescent current does not increase significantly as the dropout
voltage is approached, an ideal feature in standby/resume power systems
where data integrity is crucial. Regulator accuracy and excellent
temperature characteristics are provided by a bandgap reference. An
LS-TTL/CMOS-compatible input gives the designer complete control
over Channel 1 (1.8 V) power up, standby, or power down. A pnp pass
element provides a dropout voltage of less than 600 mV at 1 A of load
current. Low output voltages eliminate the need for expensive PWM
buck converters. The low dropout voltage permits more efficient
regulation before output regulation is lost.
This device is supplied in a 5-lead TO-252 style surface-mount
plastic package with ground tab to provide a low-resistance path for
maximum heat dissipation.
FEATURES
■
1 A Output Current per Channel
■
0.6 V Maximum Dropout Voltage at I
O
= 1 A
■
Fast Transient Response
■
1.5 mA Maximum Standby Current
■
Foldback Current Limiting
■
Ground Tab for Superior Heat Dissipation
■
Thermal Protection
APPLICATIONS
■
TVs, VCRs, Electronic Games
■
Embedded Core, Memory, or Logic Supplies
■
Printers and Other Office Equipment
■
Industrial Machinery
■
Secondary-Side Stabilization of Multi-Output SMPS
Data Sheet
27468.330
ABSOLUTE MAXIMUM RATINGS
Input Voltage, V
I
. . . . . . . . . . . . .
18 V
Output Current, I
O
. . . . . . . . . . . . .
1 A*
Enable Input Voltage, V
E
. . . . . . .
6.0 V
Junction Temperature, T
J
. . . .
+125°C
Storage Temperature Range,
T
S
. . . . . . . . . . . .
-40°C to +125°C
* Output current rating is limited by input
voltage, duty cycle, and ambient tempera-
ture. Under any set of conditions, do not
exceed a junction temperature of +125°C.
Always order by complete part number, e.g.,
SI-3005KWM-TL
,
where “-TL” indicates tape and reel.
Sanken Power Devices
from Allegro MicroSystems
SI-3005KWM
1 A, Low-Dropout,
Dual Output,
1.5 V & 1.8 V Regulator
FUNCTIONAL BLOCK DIAGRAM
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Allowable Package Power Dissipation
Recommended Operating Conditions
Min
0
-30
-20
Max
1
+85
+100
Units
A
°C
°C
DC Output Current
Operating Ambient Temp.
Operating Junction Temp.
For the availability of parts meeting -40°C requirements,
contact Allegro’s Sales Representative.
This data sheet is based on Sanken data sheet SSJ-xxxxx
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
Copyright © 2004, 2005 Allegro MicroSystems, Inc.
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SI-3005KWM
1 A, Low-Dropout,
Dual Output,
1.5 V & 1.8 V Regulator
ELECTRICAL CHARACTERISTICS
at T
A
= +25°C, V
E
= 2 V (unless otherwise noted).
Limits
Characteristic
Channel 1
Output Voltage
Output Volt. Temp. Coeff.
Output Short-Circuit Current
Line Regulation
Load Regulation
Dropout Voltage
Ripple Rejection Ratio
Channel 2
Output Voltage
Output Volt. Temp. Coeff.
Output Short-Circuit Current
Line Regulation
Load Regulation
Dropout Voltage
Ripple Rejection Ratio
Logic
Ground Terminal Current
I
GND
V
I
= 3.3 V, I
O
= 0 mA, V
E
= 2.0 V
V
I
= 3.3 V, V
E
= 0 V
Enable Input Voltage
(Channel 1 only)
Enable Input Current
(Channel 1 only)
Thermal Shutdown
V
EH
V
EL
I
EH
I
EL
T
J
Output ON
Output OFF
V
E
= 2.7 V
V
E
= 0.4 V
I
O
= 10 mA
—
—
2.0
—
—
—
135
1.0
—
—
—
—
—
150
1.5
0.5
—
0.8
5.0
-100
—
mA
mA
V
V
µA
µA
°C
V
O2
V
I
= 3.3 V, I
O2
= 10 mA
0°C
≤
T
J
≤
100°C
V
I
= 3.3 V, See note
V
I
= 3.0 V ~ 5.0 V, I
O2
= 10 mA
V
I
= 3.3 V, I
O2
= 0 A ~ 1.0 A
I
O2
= 1.0 A
V
I
= 3.3 V, 100 Hz
≤
f
≤
120 Hz
1.470
—
1.2
—
—
—
—
1.500 1.530
±0.3
—
—
—
—
60
—
—
20
30
0.6
—
V
mV/°C
A
mV
mV
V
dB
V
O1
V
I
= 3.3 V, I
O1
= 10 mA
0°C
≤
T
J
≤
100°C
V
I
= 3.3 V, See note
V
I
= 3.0 V ~ 5.0 V, I
O1
= 10 mA
V
I
= 3.3 V, I
O1
= 0 A ~ 1.0 A
I
O1
= 1.0 A
V
I
= 3.3 V, 100 Hz
≤
f
≤
120 Hz
1.764
—
1.2
—
—
—
—
1.800 1.836
±0.3
—
—
—
—
60
—
—
20
30
0.6
—
V
mV/°C
A
mV
mV
V
dB
Symbol
Test Conditions
Min.
Typ.
Max.
Units
a
VO1
I
OM1
∆V
O(∆VI)1
∆V
O(∆IO)1
V
Imin
- V
O1
PSRR
a
VO2
I
OM2
∆V
O(∆VI)2
∆V
O(∆IO)2
V
Imin
- V
O2
PSRR
Typical values are given for circuit design information only.
Note: Output short-circuit current is at point where output voltage (at V
I
= 5 V, I
O
= 10 mA) has decreased 5%.
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