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PDF AMS2910CD-50 Data sheet ( Hoja de datos )
| Número de pieza | AMS2910CD-50 | |
| Descripción | 1A LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | Advanced Monolithic Systems | |
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Advanced
Monolithic
Systems
AMS2910
1A LOW DROPOUT VOLTAGE REGULATOR
FEATURES
• Three Terminal Adjustable or Fixed Voltages*
1.5V, 2.5V, 2.85V, 3.3V, and 5.0V
• Output Current of 1A
• Operates Down to 1V Dropout
• Line Regulation: 0.2% Max.
• Load Regulation: 0.4% Max.
• Available in TO-220, TO-263, TO-252 and SOT-223
packages
APPLICATIONS
• High Efficiency Linear Regulators
• Post Regulators for Switching Supplies
• 5V to 3.3V Linear Regulator
• Battery Chargers
• Active SCSI Terminators
• Power Management for Notebook
• Battery Powered Instrumentation
GENERAL DESCRIPTION
TThhee AMS2910 series of adjustable and fixed voltage regulators are designed to provide 1A output current and to operate
down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.5V at maximum output
current, decreasing at lower load currents.
On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the stress under overload
conditions on both the regulator and power source circuitry.
The AMS2910 devices are pin compatible with other three-terminal regulators and are offered in the 3 lead TO-220 package,
in the 3Lead TO-263 (Plastic DD), in the TO-252 (D PAK) and in the low profile surface mount SOT-223 package.
ORDERING INFORMATION:
PACKAGE TYPE
3 LEAD TO-220 3 LEAD TO-263
TO-252
AMS2910CT
AMS2910CM
AMS2910CD
AMS2910CT-1.5
AMS2910CT-2.5
AMS2910CT-2.85
AMS2910CT-3.3
AMS2910CM-1.5
AMS2910CM-2.5
AMS2910CM-2.85
AMS2910CM-3.3
AMS2910CD-1.5
AMS2910CD-2.5
AMS2910CD-2.85
AMS2910CD-3.3
AMS2910CT-5.0 AMS2910CM-5.0 AMS2910CD-5.0
*For additional available fixed voltages contact factory.
SOT-223
AMS2910
AMS2910-1.5
AMS2910-2.5
AMS2910-2.85
AMS2910-3.3
AMS2910-5.0
SOT-223 Top View
PIN CONNECTIONS
FIXED VERSION
1- Ground
2- VOUT
3- VIN
ADJUSTABLE VERSION
1- Adjust
2- VOUT
3- VIN
123
TO-252 FRONT VIEW
TAB IS
OUTPUT
3
2
1
OPERATING JUNCTION
TEMPERATURE RANGE
-40°C to 125°C
-40°C to 125°C
-40°C to 125°C
-40°C to 125°C
-40°C to 125°C
-40°C to 125°C
TO-220 FRONT VIEW
TAB IS
OUTPUT
3
2
1
TO-263 FRONT VIEW
TAB IS
OUTPUT
3
2
1
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
1 page  
AMS2910
APPLICATION HINTS
Connected as shown , RP is not multiplied by the divider ratio
RP
PARASITIC
AMS2910
LINE RESISTANCE
VIN IN OUT
ADJ
R1* RL
R2*
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
Figure 3. Connections for Best Load Regulation
In the case of fixed voltage devices the top of R1 is connected
Kelvin internally, and the ground pin can be used for negative
side sensing.
The total thermal resistance from junction to ambient can be as
low as 45°C/W. This requires a reasonable sized PC board with
at least on layer of copper to spread the heat across the board and
couple it into the surrounding air.
Experiments have shown that the heat spreading copper layer
does not need to be electrically connected to the tab of the device.
The PC material can be very effective at transmitting heat
between the pad area, attached to the pad of the device, and a
ground plane layer either inside or on the opposite side of the
board. Although the actual thermal resistance of the PC material
is high, the Length/Area ratio of the thermal resistor between
layers is small. The data in Table 1, was taken using 1/16” FR-4
board with 1 oz. copper foil, and it can be used as a rough
guideline for estimating thermal resistance.
For each application the thermal resistance will be affected by
thermal interactions with other components on the board. To
determine the actual value some experimentation will be
necessary.
The power dissipation of the AMS2910 is equal to:
PD = ( VIN - VOUT )( IOUT )
Maximum junction temperature will be equal to:
TJ = TA(MAX) + PD( Thermal Resistance(junction-to-ambient))
Maximum junction temperature must not exceed 125°C.
Ripple Rejection
Thermal Considerations
The AMS2910 series have internal power and thermal limiting
circuitry designed to protect the device under overload conditions.
However maximum junction temperature ratings of 125°C should
not be exceeded under continuous normal load conditions.
Careful consideration must be given to all sources of thermal
resistance from junction to ambient. For the surface mount
package SOT-223 additional heat sources mounted near the
device must be considered. The heat dissipation capability of the
PC board and its copper traces is used as a heat sink for the
device. The thermal resistance from the junction to the tab for the
AMS2910 is 15°C/W. Thermal resistance from tab to ambient
can be as low as 30°C/W.
The ripple rejection values are measured with the adjustment pin
bypassed. The impedance of the adjust pin capacitor at the ripple
frequency should be less than the value of R1 (normally 100Ω to
200Ω) for a proper bypassing and ripple rejection approaching
the values shown. The size of the required adjust pin capacitor is
a function of the input ripple frequency. If R1=100Ω at 120Hz
the adjust pin capacitor should be >13µF. At 10kHz only 0.16µF
is needed.
The ripple rejection will be a function of output voltage, in
circuits without an adjust pin bypass capacitor. The output ripple
will increase directly as a ratio of the output voltage to the
reference voltage (VOUT / VREF ).
Table 1.
COPPER AREA
TOP SIDE* BACK SIDE BOARD AREA
2500 Sq. mm 2500 Sq. mm
2500 Sq. mm
1000 Sq. mm 2500 Sq. mm
2500 Sq. mm
225 Sq. mm 2500 Sq. mm
2500 Sq. mm
100 Sq. mm 2500 Sq. mm
2500 Sq. mm
1000 Sq. mm 1000 Sq. mm
1000 Sq. mm
1000 Sq. mm
0
1000 Sq. mm
* Tab of device attached to topside copper.
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
45°C/W
45°C/W
53°C/W
59°C/W
52°C/W
55°C/W
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
5 Page | ||
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| PDF Descargar | [ Datasheet AMS2910CD-50.PDF ] | |
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