AS2810R-3.3 [SIPEX]
Fixed Positive LDO Regulator, 3.3V, 1.2V Dropout, PSSO2, TO-252, 3 PIN;型号: | AS2810R-3.3 |
厂家: | SIPEX CORPORATION |
描述: | Fixed Positive LDO Regulator, 3.3V, 1.2V Dropout, PSSO2, TO-252, 3 PIN |
文件: | 总7页 (文件大小:154K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AS2810
1A Low Dropout Voltage Regulator
Adjustable & Fixed Output,
Fast Response
FEATURES
APPLICATIONS
• Adjustable Output Down To 1.2V
• Fixed Output Voltages 1.5V, 2.5V, 3.0V, 3.3V, 5.0V
• Output Current Of 1A
• SCSI-II Active Terminator
• Portable Palmtap/Notebook Computer
• SMPS Post-Regulator
• Disk Drives
• Low Dropout Voltage 1.2V Typ.
• Extremely Tight Load And Line Regulation
• Current & Thermal Limiting
• Portable Consumer Equipment
• Portable Instrumentation
• Battery charger
• Standard 3-Terminal Low Cost TO-220, TO-263, TO-252 & SOT-223
PRODUCT DESCRIPTION
The AS2810 is a low power positive voltage regulator designed to meet 1A output current and comply with SCSI-II specifications with
fix output voltage of 2.85V. This device is an excellent choice for use in battery-powered applications and portable computers. The
AS2810 features very low quiescent current and very low dropout voltage of 1.2V at a full load and lower as output current decreases.
This product is available as adjustable or fixed 1.5V, 2.5V, 3.0V, 3.3V, and 5V output voltages.
The AS2810 is offered in a 3-pin surface mount packages SOT-223, TO-220, TO-252 & DD package. The output capacitor of 10µF
or larger is needed for the output stability of AS2810 as required by most other regulator circuits
ORDERING INFORMATION
TO-220
3-PIN
DD PLASTIC
3-PIN
SOT-223
3-PIN
TO-252
3-PIN
OPEPERATING JUNCTION
TEMP. RANGE
AS2810YU-X
AS2810YT-X
AS2810YM3-X
AS2810YR-X
-45 to +125°C
X= Output Voltage (1.5V, 2.5V, 3.0V, 3.3V, 5.0V and Blank for Adj.)
Y= Output Tolerance, A for 1%
Blank for 2%
Consult with factory for other fixed voltages.
PIN CONNECTIONS
TO-263-3 (T)
TO-220-3 (U)
SOT-223 (M3)
AS2810
TO-252 (R)
AS2810
AS2810
1
2
3
AS2810
1
2
3
1
3
2
1
2
3
ADJ/ GND
VOUT VIN
Top View
ADJ/GND VOUT VIN
Front View
VIN
ADJ/GND
VOUT
Top View
VIN
V
ADJ/GND
OUT
Front View
Rev. 10/2/00
AS2810
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 10 Seconds) .............................. 300°C
Storage Temperature Range ............................-65° to +150°C
Operating Junction Temperature Range ......................
AS2810 Control Section............................ -45°C +125°C
AS2810 Power Transistor...........................-45°C +150°C
Input Voltage........................................................ 10V
Input to Output Voltage Differential .................... 10V
ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 10mA, TA=25°C, unless otherwise specified.
PARAMETER
CONDITIONS
Typ
AS2810A
AS2810
UNITS
Min
Max
Min
Max
1.5V Version
Output Voltage (Note 2)
AS2810-1.5V, 0 < IOUT < 1A, 3.3V<VIN<10V
AS2810-2.5V, 0 < IOUT < 1A, 4.0V<VIN<10V
1.5
1.485
1.47
1.515
1.53
1.470
1.455
1.530
1.545
V
V
2.5V Version
Output Voltage (Note 2)
2.5
2.475
2.525
2.450
2.550
2.45
2.55
2.425
2.575
2.85V Version
Output Voltage (Note 2)
2.85
3
2.822
2.879
2.793
2.907
V
V
AS2810-2.85V, 0 ≤ IOUT ≤ 1A, 4.5V≤VIN≤10V
AS2810-3.0V, 0 ≤ IOUT ≤ 1A, 4.5V≤VIN≤10V
2.793
2.907
2.650
2.936
3.0V Version
Output Voltage (Note 2)
2.970
3.030
2.94
3.06
2.940
3.060
2.79
3.09
3.3V Version
Output Voltage (Note 2)
3.3
5
3.267
3.234
3.333
3.366
3.234
3.069
3.366
3.399
V
V
AS2810-3.3V, 0 ≤ IOUT ≤ 1A, 4.8V≤VIN≤10V
AS2810-5.0V, 0 ≤ IOUT ≤ 1A, 6.5V≤VIN≤12V
5.0V Version
Output Voltage (Note 2)
4.950
5.050
4.9
5.1
4.900
5.100
4.65
5.15
All Voltage Options
Reference Voltage (VREF
)
1.250
1.225
1.270
1.225
1.270
V
mA
%
VIN≤ 7V, P≤ Pmax
1.263
1.225
1.212
1.288
1.5V≤ (VIN -VOUT)≤5.75V, 10mA≤IOUT≤1A
1.5V≤ (VIN –VOUT)≤5.75V
Min. Load Current (Note 3)
5
10
10
0.005
0.005
0.05
0.2
0.2
0.3
0.2
0.2
0.3
Line Regulation (∆VREF(Vin))
2.75V≤VIN ≤7V, IOUT=10mA, TJ=25ºC (Note 3)
VIN≤7V, IOUT=0mA, TJ=25ºC (Note 2)
%
Load Regulation(∆VREF(IOUT))
10mA≤IOUT ≤1A, (VIN-VOUT)=3V, TJ=25ºC
(Note 3)
0.05
1.1
0.3
1.2
0.3
1.2
0≤IOUT ≤1A, VIN=7V, TJ=25ºC (Note 2)
Dropout Voltage
Current Limit
∆VREF=1%
IOUT = 1A (Note 3)
OUT ≤ 1A (Note 2)
VIN=7V
I
2
1.2
1.2
A
I
OUT(MAX)
1.4V ≤ (VIN- VOUT) (Note3)
Rev. 10/2/00
AS2810
ELECTRICAL CHARACTERISTICS (Cont.)
Long Term Stability
TA=125ºC, 1000 Hrs.
0.3
(Note 2)
0.01
0.25
0.003
1
1
%
TA=25ºC, 20 ms pulse
0.020
0.020
%/W
%
% Vo
Thermal Regulation (∆VOUT(Pwr))
Temperature Stability (∆VOUT(T))
Output Noise, RMS
10Hz to 10kHz TA=25ºC
TO-220
Thermal Resistance
Junction to Tab
3.0
60
3.0
60
Junction to Ambient
DD Package
Junction to Tab
3.0
60
3.0
60
ºC/W
Junction to Ambient
SOT-223 Package
Junction to Tab
15
156
15
156
Junction to Ambient
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. 10/2/00
AS2810
APPLICATION HINTS
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.
The AS2810 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 improve the stability
and the performances.
Thermal Consideration
Stability
Although the AS2810 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.
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
Assuming:
Ripple rejection can be improved by adding a capacitor
between the ADJ pin and ground as shown in figure 6. 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 10µF for an electrolytic aluminum capacitor
or 4.7µF for a solid tantalum capacitor.
V
IN = 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
)
However the value of the ADJ-bypass capacitor should be
chosen with respect to the following equation:
For the Control Sections
C = 1 / ( 6.28 * FR * R1 )
TJ = 50 + 7.5*(0.5+6=3) = 121.25°C
121.25°C < TJ (max) for the Control & Power Sections.
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.
In both case reliable operation is insured by adequate junction
temperature.
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.
V
REF = Reference Voltage
Rev. 10/2/00
AS2810
Basic Adjustable Regulator
VIN
VOUT
AS2810
VIN
5V
VREF
VOUT
3.3V
R1
R2
AS2810
IADJ
50µA
C2
10uF
C1
10uF
VOUT = VREF * ( 1 + R/R1) + IADJ * R2
2
Basic Fixed Regulator
Fig.2 Basic Adjustable Regulator
Output Voltage
Consider Figure 2. The resistance R1 generates a constant
current flow, normally the specified load current of 10mA.
This current will go through the resistance R2 to set the overall
output voltage. The current IADJ is very small and constant.
Therefore its contribution to the overall output voltage is very
small and can generally be ignored.
Output Voltage
The fixed voltage LDO voltage regulator are simple to use
regulators since the VOUT is preset to the specifications. It is
important however, to provide the proper output capacitance
for stability and improvement. For most operating conditions
a capacitance of 22uF tantalum or 100uF electrolytic will
ensure stability and prevent oscillation.
Load Regulation
Parasitic line resistance can degrade load regulation. In order
not to affect the behavior of the regulator, it is best to connect
directly the R1 resistance from the resistor divider to the case,
and not to the load. For the same reason, it is best to connect
the resistor R2 to the Negative side of the load.
RP Parasitic Line
Resistance
VIN
AS2810
Connect R 1 to
Case of Regulator
R1
RL
R2
Connect R 2 to Load
Fig.3 Basic Adjustable Regulator
Rev. 10/2/00
AS2810
TYPICAL APPLICATIONS
VIN
VOUT
VIN
OUT
AS2810
IN
AS2810
OUT
IN
C2
C1
C1
R1
R2
ADJ
R1
ADJ
VOUT = VREF (1 + R ) + IADJ R2
R21
LOAD
Fig. 5 Typical Adjustable Regulator
Fig. 4 1A Current output Regulator
(Note A)
VIN
5V
VIN
(Note A)
IN
OUT
5V
IN
OUT
VOUT
AS2810
ADJ
AS2810
+
10µF
121Ω
ADJ
R1
1%
+
121Ω
+
10µF
1k
1%
100µF
TTL
Input
150µF
2N3904
*C1 improves ripple rejection. Xc
should be ~ R 1 at ripple frequency.
365Ω
R2
365Ω
1%
1%
+
C1
10µF*
1k
Note A: VIN(MIN)= (Intended VOUT) + (VDROPOUT (MAX)
)
Note A: VIN(MIN)= (Intended VOUT) + (VDROPOUT (MAX)
)
Fig. 6 Improving Ripple Rejection
Fig.7 5V Regulator with Shutdown
Rev. 10/2/00
AS2810
TYPICAL CHARACTERISTICS
Rev. 10/2/00
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