Voltage Regulator. AS2815 Datasheet

AS2815 Regulator. Datasheet pdf. Equivalent


Sipex Corporation AS2815
www.DataSheet4U.com
AS2815
1.5A Low Dropout Voltage Regulator
Adjustable & Fixed Output,
Fast Response
FEATURES
Adjustable Output Down To 1.2V
Fixed Output Voltages 1.5V, 2.5V, 3.3V, 5.0V
Output Current of 1.5A
Low Dropout Voltage 1.1V Typ.
Extremely Tight Load And Line Regulation
Current & Thermal Limiting
Standard 3-Terminal Low Cost TO-220, TO-263 & TO-252
Similar To Industry Standard LT1086/LT1586
APPLICATIONS
Powering VGA & Sound Card
Power PCSupplies
SMPS Post-Regulator
High Efficiency “Green” Computer Systems
High Efficiency Linear Power Supplies
Portable Instrumentation
Constant Current Regulators
Adjustable Power Supplies
Battery charger
PRODUCT DESCRIPTION
The AS2815 is a low power 1.5A adjustable and fixed voltage regulators that are very easy to use. It requires only 2 external resistors
to set the output voltage for adjustable version. The AS2815 are designed for low voltage applications that offers lower dropout
voltage and faster transient response. This device is an excellent choice for use in powering low voltage microprocessor that require a
lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching supplies
applications. The AS2815 features low dropout of a maximum 1.2V.
The AS2815 offers over current limit and protection against over-current faults, reversed input polarity, reversed load insertion, and
positive and negative transient voltage. The IQ of this device flows into the load, which increases efficiency.
The AS2815 are offered in a 3-pin TO-220, TO-263 & TO-252 packages compatible with other 3 terminal regulators. For a 3A low
dropout regulator refer to the AS2830 data sheet.
ORDERING INFORMATION
TO-220
3-PIN
DD PLASTIC
3-PIN
TO-252
DPAK
OPERERATING JUNCTION
TEMP RANGE
AS2815YU-X
AS2815YT-X AS2815YR-X
-45 to +125°C
X = Output Voltage (i.e. 1.5 for 1.5V, 2.5 for 2.5V etc.).
Y = Output Tolerance, Y= A for 1% or
Blank for 2%
Consult with factory for other fixed output voltages
PIN CONNECTIONS
TO-263-3 (T)
TO-220-3 (U)
AS2815
1 23
AS2815
123
TO-252 (R)
AS2815
1 23
ADJ/GND VOUT VIN
Top View
ADJ/GND VOUT VIN
Front View
ADJ/GND VOUT VIN
Front View
Rev. 10/11/00


AS2815 Datasheet
Recommendation AS2815 Datasheet
Part AS2815
Description 1.5A Low Dropout Voltage Regulator
Feature AS2815; www.DataSheet4U.com AS2815 1.5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Respo.
Manufacture Sipex Corporation
Datasheet
Download AS2815 Datasheet




Sipex Corporation AS2815
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 10 Seconds) .............................. 300°C
Storage Temperature Range ............................ -65° to +150°C
Operating Junction Temperature Range ......................
AS2815 Control Section ............................ -45°C +125°C
AS2815 Power Transistor...........................-45°C +150°C
AS2815
Maximum Input Supply Voltage .......................... 10V
Input to Output Voltage Differential .................... 10V
ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 10mA, Ta=25°C, unless otherwise specified.
PARAMETER
CONDITIONS
Typ
AS2815A
Min Max
1.5V Version
Output Voltage (Note 2)
2.5V Version
AS2815-1.5V, 0 IOUT1.5A, 2.75VVIN 7V
1.5
1.485
1.515
1.5
1.470
1.530
Output Voltage (Note 2)
AS2815-2.5V,0 IOUT1.5A, 3.5VVIN 7V
2.5
2.475
2.525
2.5
2.450
2.550
3.3V Version
Output Voltage (Note 2)
5.0V Version
Output Voltage (Note 2)
All Voltage Options
Reference Voltage (VREF)
Min. Load Current (Note 3)
AS2815-3.3V, 0 IOUT1.5A, 4.75VVIN 7V
AS2815-5.0V, 0 IOUT1.5A, 5.5VVIN 7V
VIN7V, PPMAX
1.5V(VIN -VOUT)5.75V, 10mAIOUT1.5A
1.5V(VIN -VOUT)5.75V
3.3
3.270
3.330
3.3
3.240
3.360
5.0 4.95 5.05
5.0 4.90 5.10
1.250
5
1.225
1.270
10
Line Regulation (VREF(VIN)) 2.75VVIN 7V, IOUT=10mA, TJ=25°C (Note 3)
0.005
0.2
VIN 7V, IOUT=0mA, TJ=25°C (Note 2)
0.005
0.2
Load Regulation(VREF(IOUT)) 10mAIOUT 1.5A, (VIN-VOUT)=3V, TJ=25°C
(Note 3)
0.05
0.3
AS2815
Min Max
1.470
1.455
1.530
1.545
2.450
2.425
2.550
2.575
3.230
3.201
3.370
3.399
4.900
4.850
5.100
5.150
1.225
1.270
10
0.2
0.2
0.3
Dropout Voltage
Current Limit
IOUT(MAX)
Long Term Stability
Thermal Regulation
(VOUT(Pwr))
Temperature Stability
(VOUT(T))
Output Noise, RMS
Thermal Resistance
0IOUT 1.5A, VIN=7V, TJ=25°C (Note 2)
VREF=1%
IOUT =1.5A (Note 3)
IOUT1.5A (Note 2)
VIN=7V
1.4V(VIN- VOUT) (Note3)
TA=125°C, 1000 Hrs.
TA=25°C, 20 ms pulse
0.05 0.3
1.1 1.2
0.3
1.2
2.5 1.7
1.7
0.3
(Note 2)
1
1
0.01 0.020
0.020
0.25
10Hz to 10khz
TO-220
DD Package
TA=25°C
Junction to Tab
Junction to Ambient
Junction to Tab
Junction to Ambient
0.003
3.0
60
3.0
60
3.0
60
3.0
60
Units
V
V
V
V
V
mA
%
%
%
%
V
A
%
%/W
%
% VO
°C/W
°C/W
The Bold specifications apply to the full operating temperature range.
Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation.
Note 2: Fixed Version Only
Note 3: Adjustable Version Only
Rev. 10/11/00



Sipex Corporation AS2815
www.DataSheet4U.com
APPLICATION HINTS
The AS2815 incorporates protection against over-current
faults, reversed load insertion, over temperature operation, and
positive and negative transient voltage. However, the use of
an output capacitor is required in order to insure the stability
and the performances.
Stability
The output capacitor is part of the regulator’s frequency
compensation system. Either a 22µF aluminum electrolytic
capacitor or a 10µF solid tantalum capacitor between the
output terminal and ground guarantees stable operation for all
operating conditions.
However, in order to minimize overshoot and undershoot, and
therefore optimize the design, please refer to the section
‘Ripple Rejection’.
Ripple Rejection
Ripple rejection can be improved by adding a capacitor
between the ADJ pin and ground. When ADJ pin bypassing is
used, the value of the output capacitor required increases to its
maximum (22µF for an aluminum electrolytic capacitor, or
10µF for a solid tantalum capacitor). If the ADJ pin is not
bypass, the value of the output capacitor can be lowered to
100µF for an electrolytic aluminum capacitor or 4.7µF for a
solid tantalum capacitor.
However the value of the ADJ-bypass capacitor should be
chosen with respect to the following equation:
C = 1 / ( 6.28 * FR * R1 )
Where C = value of the capacitor in Farads (select an
equal or larger standard value),
FR = ripple frequency in Hz,
R1 = value of resistor R1 in Ohms.
If an ADJ-bypass capacitor is use, the amplitude of the output
ripple will be independent of the output voltage. If an ADJ-
bypass capacitor is not used, the output ripple will be
proportional to the ratio of the output voltage to the reference
voltage:
M = VOUT / VREF
Where M = multiplier for the ripple seen when the ADJ pin
is optimally bypassed.
VREF = Reference Voltage
AS2815
Reducing parasitic resistance and inductance
One solution to minimize parasitic resistance and inductance is
to connect in parallel capacitors. This arrangement will
improve the transient response of the power supply if your
system requires rapidly changing current load condition.
Thermal Consideration
Although the AS2815 offers some limiting circuitry for
overload conditions, it is necessary not to exceed the
maximum junction temperature, and therefore to be careful
about thermal resistance. The heat flow will follow the lowest
resistance path, which is the Junction-to-case thermal
resistance. In order to insure the best thermal flow of the
component, a proper mounting is required. Note that the case
of the device is electrically connected to the output. In case
the case has to be electrically isolated, a thermally conductive
spacer can be used. However do not forget to consider its
contribution to thermal resistance.
Assuming:
VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50°C/W,
θ Heatsink Case = 6°C/W, θ Heatsink Case = 0.5°C/W, θ JC = 3°C/W
Power dissipation under this condition
PD = (VIN – VOUT) * IOUT = 7.5W
Junction Temperature
TJ = TA + PD * (θ Case – HS + θ HS + θ JC)
For Control & Power Sections
TJ = 50 + 7.5*(0.5+6=3) = 121.25°C
121.25°C < TJ (max) for Control & Power Sections.
In both case reliable operation is insured by adequate junction
temperature.
Rev. 10/11/00







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