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AMS1084CD datasheet
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Advanced AMS1084
Monolithic 5A LOW DROPOUT VOLTAGE REGULATOR
Systems
RoHS compliant
FEATURES APPLICATIONS
�Three Terminal Adjustable or Fixed �High Efficiency Linear Regulators
1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V �Post Regulators for Switching Supplies
�Output Current of 5A �Microprocessor Supply
�Operates Down to 1V Dropout �Battery Chargers
�Line Regulation: 0.015% �Constant Current Regulators
�Load Regulation: 0.1% �Notebook/Personal Computer Supplies
�TO-220, TO-263 and TO-252 packages available �Portable Instrumentation
GENERAL DESCRIPTION
The AMS1084 series of adjustable and fixed voltage regulators are designed to provide 5A 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 AMS1084 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:
ABSOLUTE MAXIMUM RATINGS (Note 1)
* With package soldering to 0.5in2 copper area over backside ground plane or internal power plane Ï• JA can vary from
20°C/W to >40°C/W depending on mounting technique.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IOUT = 0 mA, and TJ = +25°C unless otherwise specified.
Parameter
Conditions
Min Typ Max
Reference Voltage
(Note 2)
AMS1084
IOUT = 10 mA
10mA �IOUT �5A, 1.5V�(VIN - VOUT) �12V
Output Voltage
(Note 2)
AMS1084-1.5
0 �IOUT �5A , 3V �VIN �12V
AMS1084-2.5
0 �IOUT �5A , 4V �VIN �12V
AMS1084-2.85
0 �IOUT �5A , 4.35V�VIN �12V
AMS1084-3.0
0 �IOUT �5A , 4.5V �VIN �12V
AMS1084-3.3
0 �IOUT �5A , 4.75V �VIN �12V
AMS1084-3.5
0 �IOUT �5A, 5V �VIN �12V
AMS1084-5.0
0 �IOUT �5A , 6.5V �VIN �12V
Line Regulation
AMS1084/-1.5/-2.5/-
2.85/ -3.0/-3.3/-3.5/-5.0
ILOAD = 10 mA , 1.5V�(VIN - VOUT) �12V
Load Regulation
(Notes 2, 3)
AMS1084
(VIN - VOUT) =3V, 10mA �IOUT �5A
AMS1084-1.5
VIN = 5V, 0 �IOUT �5A
AMS1084-2.5
VIN = 5V, 0 �IOUT �5A
AMS1084-2.85
VIN = 5V, 0 �IOUT �5A
AMS1084-3.0
VIN = 5V, 0 �IOUT �5A
AMS1084-3.3
VIN = 5V, 0 �IOUT �5A
AMS1084-3.5
VIN = 5.25V, 0 �IOUT �5A
AMS1084-5.0
VIN = 8V, 0 �IOUT �5A
Dropout Voltage
(VIN - VOUT)
AMS1084/-1.5/-2.5/-
2.85/ -3.0/-3.3/-3.5/-5.0
∆VOUT , ∆VREF = 1%, IOUT = 5 A (Note 4)
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IOUT = 0 mA, and TJ = +25°C unless otherwise specified.
Parameter
Conditions
Min Typ Max
Current Limit
AMS1084/-1.5/-2.5/-
2.85/ -3.0/-3.3/-3.5/-5.0
(VIN - VOUT) = 5V
Minimum Load
Current
AMS1084
(VIN - VOUT) = 12V (Note 5)
Quiescent Current
AMS1084/-1.5/-2.5/-
2.85/ -3.0/-3.3/-3.5/-5.0
VIN �12V
Ripple Rejection
AMS1084
f =120Hz , COUT = 25µF Tantalum, IOUT = 5A, (VIN-VOUT ) = 3V, CADJ =25µF
AMS1084-1.5
f =120Hz , COUT = 25µF Tantalum, IOUT = 5A, VIN = 4.5V
AMS1084-2.5
f =120Hz , COUT = 25µF Tantalum, IOUT = 5A, VIN = 5.5V
AMS1084-2.85
f =120Hz , COUT = 25µF Tantalum, IOUT = 5A, VIN = 6V
AMS1084-3.0
f =120Hz , COUT = 25µF Tantalum, IOUT = 5A VIN = 6V
AMS1084-3.3
f =120Hz , COUT = 25µF Tantalum, IOUT = 5A VIN = 6.3V
AMS1084-3.5
f =120Hz , COUT = 25µF Tantalum, IOUT = 5A VIN = 6.5V
AMS1084-5.0
f =120Hz , COUT = 25µF Tantalum, IOUT = 5A VIN = 8V
Thermal Regulation
AMS1084
TA = 25°C, 30ms pulse
Adjust Pin Current
AMS1084
10mA �IOUT �5A , 1.5V�(VIN - VOUT) �12V
Adjust Pin Current
AMS1084
10mA �IOUT �5A , 1.5V�(VIN - VOUT) �12V
Temperature Stability
Long Term Stability
TA =125°C, 1000Hrs
RMS Output Noise
(% of VOUT )
TA = 25°C , 10Hz �f �10kHz
Thermal Resistance
Junction-to-Case
M Package: Control Circuitry/ Power Transistor
T Package: Control Circuitry/ Power Transistor
1.5/4.0
1.5/4.0
Parameters identified with boldface type apply over the full operating temperature range.
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the
Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed.
Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.
Note 3:See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead ~1/8�from the package.
Note 4: Dropout voltage is specified over the full output current range of the device.
Note 5: Minimum load current is defined as the minimum output current required to maintain regulation. When (VIN - VOUT) = 12V the device is guaranteed to regulate if the output current is greater than 10mA.
The AMS1084 series of adjustable and fixed regulators are easy to use and have all the protection features expected in high performance voltage regulators: short circuit protection and thermal shut-down.
Pin compatible with older three terminal adjustable regulators, these devices offer the advantage of a lower dropout voltage, more precise reference tolerance and improved reference stability with
temperature.
AMS1084
ADJ + C
VOUT OUT
Stability
The circuit design used in the AMS1084 series requires the use of an output capacitor as part of the device frequency compensation. The addition of 150µF aluminum electrolytic or a 22µF solid tantalum on the output will ensure stability for all operating conditions.
When the adjustment terminal is bypassed with a capacitor to
Overload Recovery
improve the ripple rejection, the requirement for an output capacitor increases. The value of 22µF tantalum or 150µF aluminum covers all cases of bypassing the adjustment terminal. Without bypassing the adjustment terminal smaller capacitors can be used with equally good results.
To ensure good transient response with heavy load current changes capacitor values on the order of 100µF are used in the output of many regulators. To further improve stability and transient response of these devices larger values of output capacitor can be used.
Protection Diodes
Unlike older regulators, the AMS1084 family does not need any protection diodes between the adjustment pin and the output and from the output to the input to prevent over-stressing the die. Internal resistors are limiting the internal current paths on the AMS1084 adjustment pin, therefore even with capacitors on the adjustment pin no protection diode is needed to ensure device safety under short-circuit conditions.
Diodes between the input and output are not usually needed. Microsecond surge currents of 50A to 100A can be handled by the internal diode between the input and output pins of the device. In normal operations it is difficult to get those values of surge currents even with the use of large output capacitances. If high value output capacitors are used, such as 1000µF to 5000µF and
the input pin is instantaneously shorted to ground, damage can
occur. A diode from output to input is recommended, when a crowbar circuit at the input of the AMS1084 is used. Normal power supply cycling or even plugging and unplugging in the system will not generate current large enough to do any damage. The adjustment pin can be driven on a transient basis ±25V, with
respect to the output without any device degradation. As with any
IC regulator, none the protection circuitry will be functional and the internal transistors will break down if the maximum input to output voltage differential is exceeded.
When the power is first turned on, as the input voltage rises, the output follows the input, permitting the regulator to start up into heavy loads. During the start-up, as the input voltage is rising, the input-to-output voltage differential remains small, allowing the regulator to supply large output currents. A problem can occur with a heavy output load when the input voltage is high and the output voltage is low, when the removal of an output short will not permit the output voltage to recover. The load line for such a load may intersect two points on the output current curve. In this case, there are two stable output operating points for the regulator. With this double intersection, the power supply may need to be cycled down to zero and brought up again to make the output recover.
Ripple Rejection
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 100â„?to120â„? 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=100�at 120Hz the adjust pin capacitor should be 25µF. At 10kHz only 0.22µF 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).
Output Voltage
The AMS1084 series develops a 1.25V reference voltage between the output and the adjust terminal. Placing a resistor between these two terminals causes a constant current to flow through R1 and down through R2 to set the overall output voltage.
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.
AMS1084
Connected as shown, RP is not multiplied by the divider ratio. Using 16-gauge wire the parasitic line resistance is about 0.004â„?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.
IN OUT ADJ
Thermal Considerations
The AMS1084 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
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 AMS1084 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 pa

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