Datasheet AMS1083 Datasheet (Advanced Monolithic Systems)

http://www.BDTIC.com/AMS
Advanced AMS1083
Monolithic 8A LOW DROPOUT VOLTAGE REGULATOR
Systems
RoHS compliant
FEATURES APPLICATIONS
1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V
Output Current of 8A Microprocessor Supply
Operates Dow
Line Regulation: 0.015% Constant Current Regulators
Load Regulation: 0.1% Notebook/Personal Computer Supplies
TO-220 and TO-263 packages available Portable Instrumentation
n to 1V Dropout Battery Chargers
GENERAL DESCRIPTION
The AMS1083 series of adjustable and fixed voltage regulators are designed to provide 8A 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 AMS1083 devices are pin compatible with older three-terminal regulators and are offered in 3 lead TO-220 package and 3 lead TO-263 (Plastic DD).
ORDERING INFORMATION:
3 LEAD TO-220 3 LEAD TO-263
AMS1083CT AMS1083CM AMS1083CT-1.5 AMS1083CM-1.5 AMS1083CT-2.5 AMS1083CM-2.5 AMS1083CT-2.85 AMS1083CM-2.85 AMS1083CT-3.0 AMS1083CM-3.0 AMS1083CT-3.3 AMS1083CM-3.3 AMS1083CT-3.5 AMS1083CM-3.5 AMS1083CT-5.0 AMS1083CM-5.0
PIN CONNECTIONS
FIXED VERSION
1- Ground 2- V
OUT
3- V
IN
PACKAGE TYPE 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
ADJUSTABLE VERSION
1- Adjust 2- V 3- V
OUT IN
Post Regulators for Switching Supplies
FRONT VIEW
3 2
1
3 2 1
TAB IS
OUTPUT
TAB IS
OUTPUT
FRONT VIEW
Advanced Monolithic Systems, Inc.
AMS1083
http://www.BDTIC.com/AMS
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Dissipation Internally limited Soldering information Input Voltage 15V Lead Temperature (25 sec) Operating Junction Temperature Thermal Resistance Control Section Power Transistor Storage temperature
0°C to 125°C
0°C to 150°C
- 65°C to +150°C
TO-220 package TO-263 package
* With package soldering to 0.5in2 copper area over backside ground plane or internal power plane ϕ 20°C/W to >40°C/W depending on mounting technique.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
= 0 mA, and TJ = +25°C unless otherwise specified.
OUT
265°C
= 50°C/W
ϕ
JA
ϕ
30°C/W *
JA=
can vary from
JA
Parameter
Device Conditions Min Typ Max Units
Reference Voltage (Note 2)
Output Voltage (Note 2)
AMS1083-2.5
Line Regulation AMS1083/-1.5/-2.5/-
Load Regulation (Notes 2, 3)
AMS1083-1.5
AMS1083-2.85
AMS1083-3.0
AMS1083-3.3
AMS1083-3.5
AMS1083-5.0
AMS1083 I
AMS1083-1.5
AMS1083-2.85
AMS1083-3.0
AMS1083-3.3
AMS1083-3.5
AMS1083-5.0
2.85/ -3.0/-3.3/-3.5/-5.0 AMS1083
AMS1083-2.5
= 10 mA
OUT
10mA I
8A , 3V VIN 12V
0 I
OUT
8A , 4V VIN 12V
0 I
OUT
0 I
8A , 4.35V VIN 12V
OUT
8A , 4.5V VIN 12V
0 I
OUT
8A , 4.75V VIN 12V
0 I
OUT
8A, 5V VIN 12V
0 I
OUT
8A , 6.5V VIN 12V
0 I
OUT
= 10 mA , 1.5V (VIN - V
I
LOAD
- V
(V
IN
OUT
= 5V, 0 ≤ I
V
IN
= 5V, 0 ≤ I
V
IN
= 5V, 0 ≤ I
V
IN
= 5V, 0 ≤ I
V
IN
= 5V, 0 ≤ I
V
IN
= 5.25V, 0 ≤ I
V
IN
= 8V, 0 ≤ I
V
IN
8A, 1.5V (VIN - V
OUT
) =3V, 10mA ≤ I
8A
OUT
8A
OUT
8A
OUT
8A
OUT
8A
OUT
8A
OUT
8A
OUT
OUT
OUT
) 12V
OUT
8A
) 12V
1.238
1.225
1.485
1.470
2.475
2.450
2.820
2.790
2.970
2.940
3.267
3.235
3.465
3.430
4.950
4.900
1.250
1.250
1.500
1.500
2.500
2.500
2.850
2.850
3.000
3.000
3.300
3.300
3.500
3.500
5.000
5.000
0.3
0.6
0.1
0.2
3 6 12
3 6 12
3 6 12
3 6 12
3 7 15
3 6 15
5
10
1.262
1.270
1.515
1.530
2.525
2.550
2.880
2.910
3.030
3.360
3.333
3.365
3.535
3.570
5.050
5.100
6
10
0.3
0.4
20
20
20
20
25
25
20 35
V V
V V
V V
V V
V V
V V
V V
V V
mV mV
% %
mV mV
mV mV
mV mV
mV mV
mV mV
mV mV
mV mV
Dropout Voltage (V
- V
OUT
)
IN
AMS1083/-1.5/-2.5/-
2.85/ -3.0/-3.3/-3.5/-5.0
Advanced Monolithic Systems, Inc.
V
OUT
, ∆V
= 1%, I
REF
= 8 A (Note 4)
OUT
1.3 1.5
V
http://www.BDTIC.com/AMS
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
= 0 mA, and TJ = +25°C unless otherwise specified.
OUT
AMS1083
Parameter
Device Conditions Min Typ Max Units
Current Limit
Minimum Load Current
Quiescent Current AMS1083/-1.5/-2.5/-
Ripple Rejection AMS1083
AMS1083-1.5
AMS1083-2.5
AMS1083-2.85
AMS1083-3.0
AMS1083-3.3
AMS1083-3.5
AMS1083-5.0
Thermal Regulation AMS1083 TA = 25°C, 30ms pulse 0.008 0.04 %W
AMS1083/-1.5/-2.5/-
2.85/ -3.0/-3.3/-3.5/-5.0
(VIN - V
AMS1083 (VIN - V
12V
V
2.85/ -3.0/-3.3/-3.5/-5.0
IN
f =120Hz , C (V
IN-VOUT
f =120Hz , C V
= 4.5V
IN
f =120Hz , C
= 5.5V
V
IN
f =120Hz , C V
= 6V
IN
f =120Hz , C V
= 6V
IN
f =120Hz , C V
= 6.3V
IN
f =120Hz , C
= 6.5V
V
IN
f =120Hz , C
= 8V
V
IN
) = 5V
OUT
) = 12V (Note 5)
OUT
= 25µF Tantalum, I
OUT
) = 3V, C
ADJ
= 25µF Tantalum, I
OUT
= 25µF Tantalum, I
OUT
= 25µF Tantalum, I
OUT
= 25µF Tantalum, I
OUT
= 25µF Tantalum, I
OUT
= 25µF Tantalum, I
OUT
= 25µF Tantalum, I
OUT
=25µF
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
= 8A,
= 8A,
= 8A,
= 8A,
= 8A
= 8A
= 8A
= 8A
8.00 9.00 10.00
5 10
60 75
60
60
60
60 72
60 72
60 72
60 68
5
72
72
72
dB
10
A
mA
mA
dB
dB
dB
dB
dB
dB
dB
Adjust Pin Current AMS1083
Adjust Pin Current
AMS1083
Change Temperature Stability
10mA I
10mA I
8A , 1.5V (VIN - V
OUT
8A , 1.5V (VIN - V
OUT
OUT
OUT
) 12V
) 12V
55
0.2
0.5
120
5
µA µA
µA
% Long Term Stability TA =125°C, 1000Hrs 0.3 1 % RMS Output Noise
OUT
)
(% of V Thermal Resistance
Junction-to-Case
= 25°C , 10Hz f 10kHz
T
A
M Package: Control Circuitry/ Power Transistor
T Package: Control Circuitry/ Power Transistor
0.003 %
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 (V
to regulate if the output current is greater than 10mA.
- V
) = 12V the device is guaranteed
IN
OUT
Advanced Monolithic Systems, Inc.
http://www.BDTIC.com/AMS
APPLICATION HINTS
The AMS1083 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.
Stability
The circuit design used in the AMS1083 series requires the use of an output capacitor as part of the device frequency compensation. The addition of tantalum on the output will ensure stability for all operating conditions. When the adjustment terminal is bypassed with a capacitor to improve the ripple rejection, the requirement for an output capacitor increases. The value of 22µF tantalum or 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 AMS1083 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 AMS1083 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 AMS1083 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.
150µF aluminum electrolytic or a 22µF solid
150µF
AMS1083
D1
V
IN
Overload Recovery
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 100 to120) 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 (V
Output Voltage
The AMS1083 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.
AMS1083
IN OUT
ADJ
/ V
OUT
REF
C
).
+
R
1
ADJ
10
µ
F
R
2
V
OUT
C
OUT
150
µ
F
Advanced Monolithic Systems, Inc.
APPLICATION HINTS
http://www.BDTIC.com/AMS
This current is normally the specified minimum load current of 10mA. Because I small error and it can usually be ignored.
V
IN
Figure 1. Basic Adjustable Regulator
Load Regulation
True remote load sensing it is not possible to provide, because the AMS1083 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:
R
R1
x ( R2+R1 ) , R
P
V
IN
is very small and constant it represents a
ADJ
AMS1083
IN OUT
ADJ
I
ADJ
50
µ
A
= V
V
OUT
(1+ R2/R1)+I
REF
V
REF
R1
R2
R2
ADJ
= Parasitic Line Resistance
P
R
P
PARASITIC
AMS1083
IN OUT
ADJ
LINE RESISTANCE
V
OUT
AMS1083
Connected as shown, R Using 16-gauge wire the parasitic line resistance is about 0.004 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 AMS1083 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.
not multiplied by the divider ratio.
P is
R1*
R2*
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
Figure 3. Connections for Best Load Regulation
Advanced Monolithic Systems, Inc.
R
L
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TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
2
TJ =25° C
1
TJ =150° C
0.10
0.05
0
-0.05
Load Regulation
I = 8A
AMS1083
Temperature Stability
2.0
1.0
0
DIFFERENTIAL (V)
MINIMUM INPUT/OUTPUT
0
0123456
OUTPUT CURRENT (A)
Ripple Rejection
80
V
RIPPLE
70 60
50 40
(VIN-V
30
OUT
20
I
RIPPLE REJECTION (dB)
OUT=IFULL LOAD
10
0
100 1k 10k 100k
Load Transient Response
0.6
0.4
0.2 0
-0.2
DEVIATION (V)
-0.4
OUTPUT VOLTAGE
~
~
8 6 4
LOAD
2
CURRENT (A)
0
0
78910
)≥V
3V
P-P
DROPOUT
V
RIPPLE
(VIN-V
FREQUENCY (Hz)
C
= 0
ADJ
CIN = 1µF
= 10µF TANTALUM
C
OUT
V
= 10V
OUT
= 13V
V
IN
PRELOAD = 100mA
50
µ
s)
TIME (
-0.10
-1.0
-0.15 OUTPUT VOLTAGE CHANGE (%)
-0.20
OUTPUT VOLTAGE DEVIATION (%)
-50 -25 0 25 50 75 100 125 150 TEMPERATURE (° C)
Ripple Rejection vs. Current
0.5V
P-P
) ≥ 3V
OUT
100
90 80 70
fR = 120Hz
V
RIPPLE
3V
P-P
60
fR =20kHz
50 40
V
RIPPLE
0.5V
P-P
30 20
RIPPLE REJECTION (dB)
10
0
0
OUTPUT CURRENT (0 TO I
0.4 0.6 0.8 1.0
0.2 ) INPUT/OUTPUT DIFFERENTIAL (V)
FULL LOAD
Line Transient Response
150
C
100
= 0
ADJ
50
0
-50
DEVIATION (mV)
-100
OUTPUT VOLTAGE
~
~
100
-150
~
~
14 13
INPUT
12
DEVIATION (V)
0 100
V
= 10V
OUT
= 0.2A
I
IN
= 1µF TANTALUM
C
IN
= 10µF TANTALUM
C
OUT
~
~
200
µ
s) CASE TEMPERATURE (° C)
TIME (
-2.0
-25 0 25 50 75 100 125 150
-50 TEMPERATURE (° C)
Short-Circuit Current
12
10
8
6
4
2
SHORT-CIRCUIT CURRENT (A)
0
02
46
81012
Maximum Power Dissipation*
100
90 80 70 60 50 40
POWER (W)
30 20
10
0
506070
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
80 90
100
110
120 130 140 150
14
Advanced Monolithic Systems, Inc.
http://www.BDTIC.com/AMS
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Minimum Operating Current
(Adjustable only)
10
9 8 7 6 5 4
3 2 1 0
024681012
MINIMUM OPERATING CURRENT (mA)
TJ = 150° C
TJ = 25° C
14 100
Adjust Pin Current
(Adjustable only)
100
90
A)
µ
80 70 60 50 40 30
20
ADJUST PIN CURRENT (
10
0
-50 -25
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD TO-220 PLASTIC PACKAGE (T)
0.165-0.180 (4.191-4.572)
0.460-0.500
(11.684-12.700)
0.390-0.415
(9.906-10.541)
0.147-0.155
(3.734-3.937)
0.230-0.270
(5.842-6.858)
0.330-0.370
(8.382-9.398)
DIA
0.570-0.620
(14.478-15.748)
0
TEMPERATURE (° C)INPUT/OUTPUT DIFFERENTIAL (V)
25 50 75
0.045-0.055
(1.143-1.397)
AMS1083
125
150
0.980-1.070
(24.892-27.178)
0.520-0.570
(13.208-14.478)
0.090-0.110
(2.286-2.794)
0.028-0.038
(0.711-0.965)
Advanced Monolithic Systems, Inc.
0.050
(1.270)
TYP
0.218-0.252
(5.537-6.401)
0.013-0.023
(0.330-0.584)
0.095-0.115
(2.413-2.921)
T (TO-220) AMS DRW# 042193
http://www.BDTIC.com/AMS
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
3 LEAD TO-263 PLASTIC DD (M)
0.390-0.415
(9.906-10.541)
0.060
(1.524)
TYP
0.335-0.380 (8.50-9.65)
0.165-0.180
(4.191-4.572)
0.595-0.615
(15.113-15.621)
0.045-0.055
(1.143-1.397)
+0.008
0.004
-0.004
+0.203
(0.102 )
-0.102
AMS1083
0.095-0.115
(2.413-2.921)
0.050±0.012
(1.270±0.305)
M (DD3) AMS DRW# 042191
0.090-0.110
(2.286-2.794)
0.050
(1.270)
TYP
0.059
(1.499)
TYP
0.013-0.023
(0.330-0.584)
Advanced Monolithic Systems, Inc.
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