AIC1531
500mA Dual Linear Regulator with Internal
Power Switch
FEATURES
Continuous 3.3V Output from Three Inputs.
Complete Power Management Solution.
V
CC
, V
SBY
Regulator Supplies 500mA Output.
Built-in Hysteresis When Selecting Input Supplies.
Integrated Switch has Very Low R
DS(ON)
120mΩ
(typ.).
Integrated Switch Supplies 500mA From V
AUX
.
Output can be Forced Higher than Input
(Off-State).
DESCRIPTION
AIC1531 is a dual input regulator with V
AUX
switch
capable
of
delivering
3.3V/500mA
continuously. The output power is provided from
three independent input voltage sources on a
prioritized basis. Power is always taken in priority
using the following order V
CC
, V
SBY
, and V
AUX
.
The AIC1531 meets Intel’s “ Instantly Available ”
power
requirements,
which
follows
and
the
“Advanced
Configuration
Power
APPLICATIONS
Desktop Computers.
PCI Adapter Cards with Wake-On-LAN.
Network Interface Cards (NICs).
Multi Power System.
System with Standby Capabilities.
Interface“ (ACPI) standards. When either V
CC
or
V
SBY
is present, the device automatically enables
the regulator and produces a stable 3.3V output
V
OUT
. When only V
AUX
(3.3V) is present, the
device
provides
a
low
impedance
direct
connection (120mΩ typ.) from V
AUX
to V
OUT
.
The AIC1531 also prevents excessive current
from flowing V
OUT
to either input voltage or
ground when the output voltage is higher than
the input voltage.
All the necessary control circuitry needed to
provide a smooth and automatic transition
between all the three supplies has been
incorporated. This allows both V
CC
and V
SBY
to
be dynamically switched without loss of output
voltage.
TYPICAL APPLICATION CIRCUIT
1
VSBY_5V
+
C1
10µF
VCC_5V
+
C2
10µF
VAUX_3.3V
3
4
VOUT
AUX
AIC1531
2
VSBY
VCC
8
GND
7
GND
6
GND
5
GND
+
C3
10µF
(Note1)
3.3V/500mA
Dual Input Regulator with Auxiliary Power Switch
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-1531G-01 121808
1
AIC1531
ORDERING INFORMATION
AIC1531XXXX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
(DIP is not available in Tape &
Reel packing type.)
PACKAGING TYPE
N: DIP-8
S: SOP-8
H3: QFN-12 (3x3)
C: COMMERCIAL
P: LEAD FREE COMMERCIAL
G: GREEN PACKAGE
Example: AIC1531CSTR
in SOP-8 Package & Taping &
Reel Packing Type
AIC1531PSTR
in SOP-8 Lead Free Package &
Taping & Reel Packing Type
PIN CONFIGURATION
DIP-8
SOP-8
TOP VIEW
VSBY
1
VCC
2
VOUT
3
AUX
4
8
GND
7
GND
6
GND
5
GND
VSBY
VCC
QFN-12 (3mmx3mm)
TOP VIEW
12 11 10
VOUT 1
VOUT 2
VOUT 3
4
AUX
5
AUX
6
N/A
9
GND
N/A
8 N/A
7 N/A
ABSOLUTE MAXIMUM RATINGS
V
CC
, V
SBY
Input Voltage
V
AUX
Input Voltage
V
OUT
Output Voltage
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
(Assume no Ambient Airflow, no Heatsink)
7.0V
4.0V
5.0V
-40°C ~ 85°C
125°C
-65°C ~ 150°C
260°C
DIP-8
SOP-8
100°C/W
160°C/W
Absolute Maximum Ratings are those values beyond which the life of a device may be Impaired.
θ
Thermal Resistance,
θ
Thermal Resistance,
JA
(Junction to Ambient)
QFN-12………………………………………..48°C/W
JC
(Junction to Case)
DIP-8…………………………………………..60°C /W
SOP-8…………………………………………40°C /W
QFN-12….………………………………….…..8°C /W
2
AIC1531
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT
ELECTRICAL CHARACTERISTICS
(V
IN
= 5V, T
A
=25°C, unless otherwise specified) (Note 2)
°
PARAMETERS
Regulated Output Voltage
Regulated Output Current
V
CC
selected
Output Voltage Load
Regulation
Output Voltage Line
Regulation
VCC Select Voltage
VCC Deselect Voltage
V
SBY
Select Voltage
V
SBY
Deselect Voltage
Hysteresis Voltage
Auxiliary Switch Resistance
Short Circuit Current
V
CC
Pin Reverse Leakage
V
SBY
Pin Reverse Leakage
AUX Pin Reverse Leakage
V
CC
Supply Current
(when V
SB
Y
is not present)
V
SBY
Supply Current
(when V
CC
is not present)
V
AUX
Supply Current
V
CC
, V
SBY
are deselected
V
CC/SBY
=5V, V
OUT
=0V
One supply input taken to ground
while the others remain at nominal
voltage
V
CC
> V
CCSEL
, I
LOAD
=0mA
V
CCDES
> V
CC
> V
OUT
V
OUT
> V
CC
V
SBY
> V
CCSEL
, I
LOAD
=0mA
V
SBYDES
> V
SB
Y
> V
OUT
V
OUT
> V
SBY
V
CC
or V
SBY
> V
OUT
V
CC
and V
SBY
< V
OUT
Both V
CC
and V
SBY
are deselected
Ground Current
V
CC/SBY
=5V, I
LOAD
= 0mA
V
CC/SB
Y
=5V, I
LOAD
= 500mA
70
50
10
70
50
10
10
50
60
100
100
300
200
20
300
200
20
100
400
300
500
500
µA
µA
µA
µA
5
50
µA
I
LOAD
=50mA ~ 500 mA
V
SBY
selected
I
LOAD
=50mA ~ 500mA
V
CC
=4.5V~5.5V, I
LOAD
=5mA
V
SBY
=4.5V~5.5V, I
LOAD
=5mA
V
SBY
> V
SBYDES
or V
AUX
present
V
CC
< V
CCDES
V
AUX
present
V
SBY
< V
SBYDES
3.90
3.90
2
4.50
4.20
4.50
4.20
0.30
120
1000
200
4.60
4.60
mV
20
mV
CONDITIONS
0mA < I
LOAD
< 500mA
MIN.
3.135
500
TYP.
3.300
MAX.
3.465
UNIT
V
mA
V
V
V
mΩ
mA
Note 1:
To avoid output oscillation, aluminum electrolytic output capacitor is recommended and ceramic
capacitor is not suggested.
Note 2:
Specifications are production tested at T
A
= 25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
3
Analog electronics
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