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PDF AMS1587CD-15 Data sheet ( Hoja de datos )
| Número de pieza | AMS1587CD-15 | |
| Descripción | 3A LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | Advanced Monolithic Systems | |
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Advanced
Monolithic
Systems
AMS1587
3A LOW DROPOUT VOLTAGE REGULATOR
FEATURES
• Three Terminal Adjustable or Fixed Voltages
1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V
• Output Current of 3A
• Operates Down to 1V Dropout
• Fast Transient response
• Line Regulation: 0.015%
• TO-220, TO-263 and TO-252 packages available
APPLICATIONS
• High Efficiency Linear Regulators
• Post Regulators for Switching Supplies
• Microprocessor Supply
• Battery Chargers
• Constant Current Regulators
• Notebook/Personal Computer Supplies
• Portable Instrumentation
GENERAL DESCRIPTION
TThhee AMS1587 series of adjustable and fixed voltage regulators are designed to provide 3A output current and to operate
down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V 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 AMS1587 devices are pin compatible with older three-terminal regulators and are offered in 3 lead TO-220 package, 3
and 2 lead TO-263 (Plastic DD) and TO-252 (D PAK) package.
ORDERING INFORMATION:
3 LEAD TO-220
AMS1587CT
AMS1587CT-1.5
AMS1587CT-2.5
AMS1587CT-2.85
AMS1587CT-3.0
AMS1587CT-3.3
AMS1587CT-3.5
AMS1587CT-5.0
PACKAGE TYPE
2&3 LEAD TO-263
TO-252
AMS1587CM
AMS1587CM-1.5
AMS1587CM-2.5
AMS1587CM-2.85
AMS1587CM-3.0
AMS1587CM-3.3
AMS1587CM-3.5
AMS1587CM-5.0
AMS1587CD
AMS1587CD-1.5
AMS1587CD-2.5
AMS1587CD-2.85
AMS1587CD-3.0
AMS1587CD-3.3
AMS1587CD-3.5
AMS1587CD-5.0
PIN CONNECTIONS
FIXED VERSION
1- Ground
2- VOUT
3- VIN
ADJUSTABLE VERSION
1- Adjust
2- VOUT
3- VIN
OPERATING JUNCTION
TEMPERATURE RANGE
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
TO-252 FRONT VIEW
TAB IS
OUTPUT
3
2
1
2L TO-263 FRONT VIEW
TAB IS
OUTPUT
3
2
1
TO-220 FRONT VIEW
TAB IS
OUTPUT
3
2
1
3L 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  
APPLICATION HINTS
This current is normally the specified minimum load current of
10mA. Because IADJ is very small and constant it represents a
small error and it can usually be ignored.
AMS1587
VIN IN OUT
VOUT
ADJ
VREF R1
IADJ
50µA
R2
VOUT = VREF (1+ R2/R1)+IADJR2
Figure 1. Basic Adjustable Regulator
Load Regulation
True remote load sensing it is not possible to provide, because the
AMS1587 is a three terminal device. The resistance of the wire
connecting the regulator to the load will limit the load regulation.
The data sheet specification for load regulation is measured at the
bottom of the package. Negative side sensing is a true Kelvin
connection, with the bottom of the output divider returned to the
negative side of the load.
The best load regulation is obtained when the top of the resistor
divider R1 is connected directly to the case not to the load. If R1
were connected to the load, the effective resistance between the
regulator and the load would be:
RP x ( R2+R1 ) ,
R1
AMS1587
VIN IN OUT
ADJ
RP = Parasitic Line Resistance
RP
PARASITIC
LINE RESISTANCE
R1* RL
R2*
AMS1587
Connected as shown, RP is not multiplied by the divider ratio.
Using 16-gauge wire the parasitic line resistance is about 0.004Ω
per foot, translating to 4mV/ft at 1A load current. It is important
to keep the positive lead between regulator and load as short as
possible and use large wire or PC board traces.
Thermal Considerations
The AMS1587 series have internal power and thermal limiting
circuitry designed to protect the device under overload
conditions. However maximum junction temperature ratings
should not be exceeded under continuous normal load conditions.
Careful consideration must be given to all sources of thermal
resistance from junction to ambient, including junction-to-case,
case-to-heat sink interface and heat sink resistance itself. To
ensure safe operating temperatures and reflect more accurately
the device temperature, new thermal resistance specifications
have been developed. Unlike older regulators with a single
junction-to-case thermal resistance specification, the data section
for these new regulators provides a separate thermal resistance
and maximum junction temperature for both the Control Section
and the Power Transistor. Calculations for both temperatures
under certain conditions of ambient temperature and heat sink
resistance and to ensure that both thermal limits are met.
Junction-to-case thermal resistance is specified from the IC
junction to the bottom of the case directly below the die. This is
the lowest resistance path for the heat flow. In order to ensure the
best possible thermal flow from this area of the package to the
heat sink proper mounting is required. Thermal compound at the
case-to-heat sink interface is recommended. A thermally
conductive spacer can be used, if the case of the device must be
electrically isolated, but its added contribution to thermal
resistance has to be considered.
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
Figure 2. Connections for Best Load Regulation
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
5 Page | ||
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