AMS1085CT-35 概述
3A LOW DROPOUT VOLTAGE REGULATOR 3A低压差稳压器
AMS1085CT-35 数据手册
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Monolithic
Systems
AMS1085
3A LOW DROPOUT VOLTAGE REGULATOR
FEATURES
APPLICATIONS
· 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
· High Efficiency Linear Regulators
· Post Regulators for Switching Supplies
· Microprocessor Supply
· Operates Down to 1V Dropout
· Battery Chargers
· Load Regulation: 0.1%
· Line Regulation: 0.015%
· TO-220, TO-263 and TO-252 packages available
· Constant Current Regulators
· Notebook/Personal Computer Supplies
· Portable Instrumentation
GENERAL DESCRIPTION
The AMS1085 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 1.5V 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 AMS1085 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:
PACKAGE TYPE
OPERATING JUNCTION
TEMPERATURE RANGE
3 LEAD TO-220 2&3 LEAD TO-263
TO-252
AMS1085CT
AMS1085CT-1.5
AMS1085CT-2.5
AMS1085CM
AMS1085CM-1.5
AMS1085CM-2.5
AMS1085CD
AMS1085CD-1.5
AMS1085CD-2.5
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
AMS1085CT-2.85 AMS1085CM-2.85 AMS1085CD-2.85
AMS1085CT-3.0
AMS1085CT-3.3
AMS1085CT-3.5
AMS1085CT-5.0
AMS1085CM-3.0
AMS1085CM-3.3
AMS1085CM-3.5
AMS1085CM-5.0
AMS1085CD-3.0
AMS1085CD-3.3
AMS1085CD-3.5
AMS1085CD-5.0
TO-220 FRONT VIEW
3
TO-252 FRONT VIEW
TAB IS
OUTPUT
PIN CONNECTIONS
3
2
1
2
1
TAB IS
OUTPUT
ADJUSTABLE VERSION
FIXED VERSION
3L TO-263 FRONT VIEW
3
2L TO-263 FRONT VIEW
1- Ground
2- VOUT
3- VIN
1- Adjust
2- VOUT
3- VIN
3
TAB IS
OUTPUT
TAB IS
OUTPUT
2
1
2
1
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1085
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Dissipation
Internally limited
Soldering information
Lead Temperature (10 sec)
Thermal Resistance
TO-220 package
Input Voltage
15V
300°C
Operating Junction Temperature
Control Section
Power Transistor
0°C to 125°C
0°C to 150°C
j JA= 50°C/W
TO-263 package
j
JA= 30°C/W *
Storage temperature
TO-252 package
- 65°C to +150°C
j JA= 100°C/W
* With package soldering to 0.5in2 copper area over
backside ground plane or internal power plane j 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
Device
Conditions
Min
Typ
Max
Units
Reference Voltage
(Note 2)
AMS1085
IOUT = 10 mA
10mA £ IOUT £ 3A, 1.5V£ (VIN - VOUT) £ 12V
1.238
1.225
1.250
1.250
1.262
1.270
V
V
Output Voltage
(Note 2)
AMS1085-1.5
AMS1085-2.5
AMS1085-2.85
AMS1085-3.0
AMS1085-3.3
AMS1085-3.5
AMS1085-5.0
1.485
1.470
1.500
1.500
1.515
1.530
V
V
0 £ IOUT £ 3A , 3V£ VIN £ 12V
0 £ IOUT £ 3A , 4V£ VIN £ 12V
0 £ IOUT £ 3A , 4.35V£ VIN £ 12V
0 £ IOUT £ 3A , 4.5V £ VIN £ 12V
0 £ IOUT £ 3A , 4.75V £ VIN £ 12V
0 £ IOUT £ 3A , 5V £ VIN £ 12V
0 £ IOUT £ 3A , 6.5V £ VIN £ 12V
ILOAD = 10 mA , 1.5V£ (VIN - VOUT) £ 12V
(VIN - VOUT) =3V, 10mA £ IOUT £ 3A
2.475
2.450
2.500
2.500
2.525
2.550
V
V
2.82
2.79
2.850
2.850
2.88
2.91
V
2.970
2.940
3.000
3.000
3.300
3.360
V
V
3.267
3.235
3.300
3.300
3.333
3.365
V
V
3.465
3.430
3.500
3.500
3.535
3.570
V
V
4.950
4.900
5.000
5.000
5.050
5.100
V
V
Line Regulation
AMS1085/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
0.3
0.6
10
10
mV
mV
Load Regulation
(Notes 2, 3)
AMS1085
0.1
0.2
.03
.04
%
%
AMS1085-1.5
AMS1085-2.5
AMS1085-2.85
AMS1085-3.0
AMS1085-3.3
AMS1085-3.5
AMS1085-5.0
3
6
12
20
mV
mV
VIN = 5V, 0 £ IOUT £ 3A
VIN = 5V, 0 £ IOUT £ 3A
VIN = 5V, 0 £ IOUT £ 3A
VIN = 5V, 0 £ IOUT £ 3A
VIN = 5V, 0 £ IOUT £ 3A
VIN = 5.25V, 0 £ IOUT £ 3A
VIN = 8V, 0 £ IOUT £ 3A
3
6
12
20
mV
mV
3
6
12
20
mV
mV
3
6
12
20
mV
mV
3
7
15
25
mV
mV
3
6
15
25
mV
mV
5
10
20
35
mV
mV
Dropout Voltage
AMS1085/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
V
1.3
1.5
DVOUT , DVREF = 1%, IOUT = 3 A (Note 4)
(VIN - V )
OUT
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1085
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IOUT = 0 mA, and TJ = +25°C unless otherwise specified.
Parameter
Device
Conditions
Min
Typ
Max
Units
Current Limit
AMS1085/-1.5/-2.5/-2.85/ (VIN - VOUT) = 5V
-3.0/-3.3/-3.5/-5.0
A
3.00
3.50
5
4.00
10
Minimum Load
Current
AMS1085
(VIN - VOUT) = 12V (Note 5)
mA
mA
dB
Quiescent Current
AMS1085/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
5
10
VIN £ 12V
Ripple Rejection
AMS1085
60
60
60
60
60
60
60
60
75
f =120Hz , COUT = 25mF Tantalum, IOUT = 3A,
(VIN-VOUT ) = 3V, CADJ =25mF
AMS1085-1.5
AMS1085-2.5
AMS1085-2.85
AMS1085-3.0
AMS1085-3.3
AMS1085-3.5
AMS1085-5.0
dB
dB
dB
dB
dB
dB
dB
%W
72
72
72
72
72
72
68
f =120Hz , COUT = 25mF Tantalum, IOUT = 3A,
VIN = 4.5V
f =120Hz , COUT = 25mF Tantalum, IOUT = 3A,
VIN = 5.5V
f =120Hz , COUT = 25mF Tantalum, IOUT = 3A,
VIN = 6V
f =120Hz , COUT = 25mF Tantalum, IOUT = 3A
VIN = 6V
f =120Hz , COUT = 25mF Tantalum, IOUT = 3A
VIN = 6.3V
f =120Hz , COUT = 25mF Tantalum, IOUT = 3A
VIN = 6.5V
f =120Hz , COUT = 25mF Tantalum, IOUT = 3A
VIN = 8V
Thermal Regulation
Adjust Pin Current
AMS1085
AMS1085
TA = 25°C, 30ms pulse
0.008
55
0.04
10mA £ IOUT £ 3A , 1.5V£ (VIN - VOUT) £ 12V
mA
mA
120
5
Adjust Pin Current
Change
AMS1085
0.2
10mA £ IOUT £ 3A , 1.5V£ (VIN - VOUT) £12V
mA
Temperature Stability
Long Term Stability
RMS Output Noise
%
%
%
0.5
0.3
TA =125°C, 1000Hrs
1
0.003
TA = 25°C , 10Hz £ f £ 10kHz
(% of VOUT
)
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
°C/W
°C/W
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.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1085
APPLICATION HINTS
The AMS1085 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 shutdown.
D1
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.
AMS1085
VOUT
VIN
IN
OUT
ADJ
+
COUT
R1
150mF
CADJ
Stability
R2
10mF
The circuit design used in the AMS1085 series requires the use of
an output capacitor as part of the device frequency compensation.
The addition of 150mF aluminum electrolytic or a 22mF solid
tantalum on the output will ensure stability for all operating
conditions.
Overload Recovery
When the adjustment terminal is bypassed to improve the ripple
rejection, the requirement for an output capacitor increases. The
value of 22mF tantalum or 150mF 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 100mF 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.
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.
Protection Diodes
Unlike older regulators, the AMS1085 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
AMS1085 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 1000mF to 5000mF 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 AMS1085 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.
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 100W
to120W) 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=100W at 120Hz
the adjust pin capacitor should be 25mF. At 10kHz only 0.22mF 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 AMS1085 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.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1085
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.
Connected as shown, RP is not multiplied by the divider ratio.
Using 16-gauge wire the parasitic line resistance is about 0.004W
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.
AMS1085
VOUT
VIN
IN
OUT
ADJ
Thermal Considerations
VREF
R1
R2
The AMS1085 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.
IADJ
50mA
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
AMS1085 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:
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
RP x ( R2+R1 ) , RP = Parasitic Line Resistance
R1
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.
RP
PARASITIC
LINE RESISTANCE
AMS1085
VIN
IN
OUT
ADJ
RL
R1*
R2*
*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
AMS1085
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
Load Regulation
Temperature Stability
0.10
2.0
2
1
0
DI = 3A
0.05
0
1.0
0
TJ =25° C
-0.05
TJ =150° C
-0.10
-1.0
-2.0
-0.15
-0.20
0
1
2
3
4
-50 -25
0
25 50 75 100 125 150
-25
0
25 50 75 100 125 150
-50
TEMPERATURE (° C)
OUTPUT CURRENT (A)
TEMPERATURE (° C)
Ripple Rejection
Ripple Rejection vs. Current
Short-Circuit Current
80
70
6
100
90
VRIPPLE 3V
VRIPPLE 0.5V
£
P-P
£
P-P
5
4
3
80
70
60
50
40
fR = 120Hz
VRIPPLE£ 3VP-P
60
50
(VIN-VOUT) ³ 3V
fR =20kHz
VRIPPLE 0.5VP-P
40
30
£
(VIN-VOUT)³ VDROPOUT
2
1
0
30
20
20
IOUT=IFULL LOAD
10
0
10
0
0
100
1k
10k
100k
0.4
0.6
0.8
1.0
)
4
6
14
0.2
0
2
8
10 12
FREQUENCY (Hz)
OUTPUT CURRENT (0 TO IFULL LOAD
INPUT/OUTPUT DIFFERENTIAL (V)
Maximum Power Dissipation*
Load Transient Response
Line Transient Response
50
40
0.3
0.2
0.1
0
60
40
CADJ = 0
CADJ = 0
20
0
-20
-40
-60
-0.1
30
20
CIN = 1
COUT = 10
mF
-0.2
-0.3
m
F TANTALUM
VOUT = 10V
IIN = 0.2A
~
~
~
~
~
~
~
CIN = 1mF TANTALUM
~
3
2
VOUT = 10V
VIN= 13V
PRELOAD = 100mA
14
13
12
COUT = 10mF TANTALUM
10
0
1
0
0
0
100
TIME ( s)
200
50
70
100
110 120 130 140 150
50
TIME ( s)
80 90
60
100
m
CASE TEMPERATURE (° C)
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
m
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1085
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Minimum Operating Current
Adjust Pin Current
(Adjustable only)
(Adjustable only)
100
10
9
90
80
70
60
50
40
8
TJ = 150° C
7
6
TJ = 25° C
5
4
30
20
3
2
10
0
-50 -25
1
0
25 50 75
100 125
0
2
4
6
8
10 12 14
0
150
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (° C)
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD TO-220 PLASTIC PACKAGE (T)
0.147-0.155
0.165-0.180
(4.191-4.572)
0.390-0.415
(9.906-10.541)
(3.734-3.937)
0.045-0.055
(1.143-1.397)
DIA
0.230-0.270
(5.842-6.858)
0.570-0.620
(14.478-15.748)
0.460-0.500
(11.684-12.700)
0.330-0.370
(8.382-9.398)
0.980-1.070
(24.892-27.178)
0.218-0.252
(5.537-6.401)
0.520-0.570
(13.208-14.478)
0.090-0.110
(2.286-2.794)
0.050
(1.270)
TYP
0.013-0.023
(0.330-0.584)
0.095-0.115
(2.413-2.921)
0.028-0.038
(0.711-0.965)
T (TO-220) AMS DRW# 042193
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1085
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
3 LEAD TO-263 PLASTIC DD (M)
0.165-0.180
(4.191-4.572)
0.060
(1.524)
0.390-0.415
(9.906-10.541)
0.045-0.055
(1.143-1.397)
TYP
+0.008
-0.004
+0.203
0.004
0.330-0.370
(8.382-9.398)
(0.102
)
-0.102
0.095-0.115
(2.413-2.921)
0.108
(2.74)
0.199-0.218
(5.05-5.54 )
TYP
0.90-0.110
(2.29-2.79)
0.090-0.110
(2.286-2.794)
0.032
(0.81)
TYP
0.013-0.023
(0.330-0.584)
M (DD3) AMS DRW# 042191R1
2 LEAD TO-263 PLASTIC DD (M)
0.165-0.180
(4.191-4.572)
0.060
(1.524)
0.390-0.415
(9.906-10.541)
0.045-0.055
(1.143-1.397)
TYP
+0.008
-0.004
+0.203
0.004
0.330-0.370
(8.382-9.398)
(0.102
)
-0.102
0.0295
0.095-0.115
0.108
(2.74)
TYP
(0.7495)
(2.413-2.921)
0.199-0.218
(5.05-5.54 )
TYP
0.90-0.110
(2.29-2.79)
0.090-0.110
(2.286-2.794)
0.032
(0.81)
TYP
0.013-0.023
(0.330-0.584)
M (DD2) AMS DRW# 072191
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1085
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
TO-252 PLASTIC PACKAGE (D)
0.258-0.262
(6.553-6.654)
0.208-0.212
(5.283-5.384)
0.020-0.030
0.085-0.095
(0.508-0.762)
0.033-0.037
(2.159-2.413)
0.030-0.034
(0.762-0.863)
0.020-0.030
(0.508-0.762)
(0.838-0.939)
0.038-0.042
(0.965-1.066)
7.0°
0.023-0.027
(0.584-0.685)
45.0°
0.175-0.180
(4.191-4.445)
0.235-0.245
(5.969-6.223)
0.057-0.067
(0.144-0.170)
DIA
0.025
(0.635)
TYP
0.038
(0.965)
TYP
0.038-0.042
(0.965-1.066)
0.099-0.103
(2.514-2.615)
0.024±0.002
(0.610±0.0508)
0.088-0.092
(2.235-2.336)
0.030
(0.762)
TYP
0.018-0.022
(0.451-0.558)
D (D3) AMS DRW# 042891
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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AMS1085D-1.8TR | AMS | 3A LDO VOLTAGE REGULATOR | 获取价格 | |
AMS1085D-2.5 | AMS | 3A LDO VOLTAGE REGULATOR | 获取价格 | |
AMS1085D-2.5TR | AMS | 3A LDO VOLTAGE REGULATOR | 获取价格 |
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