AMS1083CT-3.5 [ASI]

Fixed Positive LDO Regulator,;


型号：	AMS1083CT-3.5
厂家：	ADVANCED SEMICONDUCTOR
描述：	Fixed Positive LDO Regulator, 输出元件调节器
文件：	总8页 (文件大小：68K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Advanced

Monolithic

Systems

AMS1083

8A LOW DROPOUT VOLTAGE REGULATOR

RoHS compliant

FEATURES

APPLICATIONS

• Three Terminal Adjustable or Fixed

1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V

• Output Current of 8A

• Operates Down to 1V Dropout

• Line Regulation: 0.015%

• Load Regulation: 0.1%

• TO-220 and TO-263 packages available

• High Efficiency Linear Regulators

• Post Regulators for Switching Supplies

• Microprocessor Supply

• Battery Chargers

• Constant Current Regulators

• Notebook/Personal Computer Supplies

• Portable Instrumentation

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:

PACKAGE TYPE

OPERATING JUNCTION

TEMPERATURE RANGE

3 LEAD TO-220

3 LEAD TO-263

AMS1083CM

AMS1083CT

0 to 125° C

AMS1083CT-1.5

AMS1083CT-2.5

AMS1083CT-2.85

AMS1083CT-3.0

AMS1083CT-3.3

AMS1083CT-3.5

AMS1083CT-5.0

AMS1083CM-1.5

AMS1083CM-2.5

AMS1083CM-2.85

AMS1083CM-3.0

AMS1083CM-3.3

AMS1083CM-3.5

AMS1083CM-5.0

FRONT VIEW

TAB IS

OUTPUT

PIN CONNECTIONS

FRONT VIEW

ADJUSTABLE VERSION

FIXED VERSION

TAB IS

OUTPUT

1- Ground

2- V_OUT

3- V_IN

1- Adjust

2- V_OUT

3- V_IN

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS1083

ABSOLUTE MAXIMUM RATINGS (Note 1)

Power Dissipation

Input Voltage

Internally limited

Soldering information

Lead Temperature (25 sec)

Thermal Resistance

TO-220 package

15V

265°C

Operating Junction Temperature

Control Section

Power Transistor

0°C to 125°C

0°C to 150°C

- 65°C to +150°C

_JA= 50°C/W

_JA= 30°C/W *

TO-263 package

* With package soldering to 0.5in²copper area over backside

Storage temperature

ground plane or internal power plane ϕ

can vary from

20°C/W to >40°C/W depending on mounting technique.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I_OUT= 0 mA, and T_J= +25°C unless otherwise specified.

Parameter

Device

Conditions

Min

Typ

Max

Units

Reference Voltage

(Note 2)

AMS1083

I_OUT= 10 mA

10mA ≤ I_OUT≤ 8A, 1.5V≤ (V_IN- V_OUT) ≤ 12V

1.238

1.225

1.250

1.262

1.270

Output Voltage

(Note 2)

AMS1083-1.5

AMS1083-2.5

AMS1083-2.85

AMS1083-3.0

AMS1083-3.3

AMS1083-3.5

AMS1083-5.0

1.485

1.470

1.500

1.515

1.530

0 ≤ I_OUT≤ 8A , 3V≤ V_IN≤ 12V

0 ≤ I_OUT≤ 8A , 4V≤ V_IN≤ 12V

0 ≤ I_OUT≤ 8A , 4.35V≤ V_IN≤ 12V

0 ≤ I_OUT≤ 8A , 4.5V ≤ V_IN≤ 12V

0 ≤ I_OUT≤ 8A , 4.75V ≤ V_IN≤ 12V

0 ≤ I_OUT≤ 8A, 5V ≤ V_IN≤ 12V

2.475

2.450

2.500

2.525

2.550

2.820

2.790

2.850

2.880

2.910

2.970

2.940

3.000

3.030

3.360

3.267

3.235

3.300

3.333

3.365

3.465

3.430

3.500

3.535

3.570

4.950

4.900

5.000

5.050

5.100

0 ≤ I_OUT≤ 8A , 6.5V ≤ V_IN≤ 12V

I_LOAD= 10 mA , 1.5V≤ (V_IN- V_OUT) ≤ 12V

(V_IN- V_OUT) =3V, 10mA ≤ I_OUT≤ 8A

Line Regulation

AMS1083/-1.5/-2.5/-

2.85/ -3.0/-3.3/-3.5/-5.0

0.3

0.6

Load Regulation

(Notes 2, 3)

AMS1083

0.1

0.2

0.3

0.4

AMS1083-1.5

AMS1083-2.5

AMS1083-2.85

AMS1083-3.0

AMS1083-3.3

AMS1083-3.5

AMS1083-5.0

V_IN= 5V, 0 ≤ I_OUT≤ 8A

V_IN= 5.25V, 0 ≤ I_OUT≤ 8A

V_IN= 8V, 0 ≤ I_OUT≤ 8A

Dropout Voltage

AMS1083/-1.5/-2.5/-

2.85/ -3.0/-3.3/-3.5/-5.0

1.3

1.5

∆V_OUT, ∆V_REF= 1%, I_OUT= 8 A (Note 4)

(V_IN- V

)

OUT

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS1083

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I_OUT= 0 mA, and T_J= +25°C unless otherwise specified.

Parameter

Device

Conditions

Min

Typ

Max

Units

Current Limit

AMS1083/-1.5/-2.5/-

2.85/ -3.0/-3.3/-3.5/-5.0

(V_IN- V_OUT) = 5V

(V_IN- V_OUT) = 12V (Note 5)

V_IN≤ 12V

8.00

9.00

10.00

Minimum Load

Current

AMS1083

Quiescent Current

AMS1083/-1.5/-2.5/-

2.85/ -3.0/-3.3/-3.5/-5.0

Ripple Rejection

AMS1083

f =120Hz , C_OUT= 25µF Tantalum, I_OUT= 8A,

(V_IN-V_OUT) = 3V, C_ADJ=25µF

AMS1083-1.5

AMS1083-2.5

AMS1083-2.85

AMS1083-3.0

AMS1083-3.3

AMS1083-3.5

AMS1083-5.0

f =120Hz , C_OUT= 25µF Tantalum, I_OUT= 8A,

V_IN= 4.5V

f =120Hz , C_OUT= 25µF Tantalum, I_OUT= 8A,

V_IN= 5.5V

f =120Hz , C_OUT= 25µF Tantalum, I_OUT= 8A,

V_IN= 6V

f =120Hz , C_OUT= 25µF Tantalum, I_OUT= 8A

V_IN= 6V

f =120Hz , C_OUT= 25µF Tantalum, I_OUT= 8A

V_IN= 6.3V

f =120Hz , C_OUT= 25µF Tantalum, I_OUT= 8A

V_IN= 6.5V

f =120Hz , C_OUT= 25µF Tantalum, I_OUT= 8A

V_IN= 8V

Thermal Regulation

Adjust Pin Current

AMS1083

T_A= 25°C, 30ms pulse

0.008

0.04

10mA ≤ I_OUT≤ 8A , 1.5V≤ (V_IN- V_OUT) ≤ 12V

µA

120

Adjust Pin Current

Change

AMS1083

0.2

10mA ≤ I_OUT≤ 8A , 1.5V≤ (V_IN- V_OUT) ≤ 12V

µA

Temperature Stability

Long Term Stability

RMS Output Noise

0.5

0.3

T_A=125°C, 1000Hrs

0.003

T_A= 25°C , 10Hz ≤ f ≤ 10kHz

(% of V_OUT

)

Thermal Resistance

Junction-to-Case

M Package: Control Circuitry/ Power Transistor

T Package: Control Circuitry/ Power Transistor

1.5/4.0

°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_IN- V_OUT) = 12V the device is guaranteed

to regulate if the output current is greater than 10mA.

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS1083

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.

AMS1083

V_OUT

V_IN

OUT

ADJ

C_OUT

R₁

150µF

Stability

C_ADFJ

R₂

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 150µF aluminum electrolytic or a 22µF solid

tantalum on the output will ensure stability for all operating

conditions.

Overload Recovery

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 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.

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 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.

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 100Ω

to120Ω) 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 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_OUT/ V_REF).

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.

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS1083

APPLICATION HINTS

This current is normally the specified minimum load current of

10mA. Because I_ADJis very small and constant it represents a

small error and it can usually be ignored.

Connected as shown, R_Pnot 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.

AMS1083

Thermal Considerations

V_OUT

V_IN

OUT

ADJ

V_REF

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.

I_ADJ

50µA

V_OUT= V_REF(1+ R2/R1)+I_ADJR2

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:

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.

R_Px ( R2+R1 ) , R_P= Parasitic Line Resistance

R_P

PARASITIC

LINE RESISTANCE

AMS1083

V_IN

OUT

ADJ

R_L

R1*

R2*

*CONNECT R1 TO CASE

CONNECT R2 TO LOAD

Figure 3. Connections for Best Load Regulation

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS1083

TYPICAL PERFORMANCE CHARACTERISTICS

Dropout Voltage

Load Regulation

Temperature Stability

0.10

2.0

∆I = 8A

0.05

1.0

T_J=25° C

-0.05

T_J=150° C

-0.10

-1.0

-2.0

-0.15

-0.20

-50 -25

25 50 75 100 125 150

-25

25 50 75 100 125 150

-50

TEMPERATURE (° C)

OUTPUT CURRENT (A)

TEMPERATURE (° C)

Ripple Rejection

Ripple Rejection vs. Current

Short-Circuit Current

100

V_RIPPLE

≤

3V_P-P

V_RIPPLE

≤

0.5V_P-P

f_R= 120Hz

V_RIPPLE≤ 3V_P-P

(V_IN-V_OUT) ≥ 3V

f_R=20kHz

V_RIPPLE0.5V_P-P

≤

(V_IN-V_OUT)≥V_DROPOUT

I_OUT=I_{FULL LOAD}

100

10k

100k

0.4

0.6

0.8

1.0

0.2

10 12

FREQUENCY (Hz)

OUTPUT CURRENT (0 TO I _{FULL LOAD}

)

INPUT/OUTPUT DIFFERENTIAL (V)

Maximum Power Dissipation*

Load Transient Response

Line Transient Response

0.6

0.4

0.2

150

100

C_ADJ= 0

-50

-100

-150

-0.2

-0.4

C_IN= 1µF

C_OUT= 10

F TANTALUM

V_OUT= 10V

I_IN= 0.2A

V_OUT= 10V

V_IN= 13V

PRELOAD = 100mA

C_IN= 1µF TANTALUM

C_OUT= 10µF TANTALUM

100

200

100

110 120 130 140 150

80 90

100

TIME (µs)

CASE TEMPERATURE (° C)

*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS1083

TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

Minimum Operating Current

Adjust Pin Current

(Adjustable only)

100

T_J= 150° C

T_J= 25° C

-50 -25

25 50 75

100 125

10 12 14

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. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS1083

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

0.595-0.615

(15.113-15.621)

0.335-0.380

(8.50-9.65)

(0.102

)

-0.102

0.095-0.115

0.059

(1.499)

TYP

(2.413-2.921)

0.050±0.012

(1.270±0.305)

0.090-0.110

(2.286-2.794)

0.050

(1.270)

TYP

0.013-0.023

(0.330-0.584)

M (DD3) AMS DRW# 042191

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS1083CT-3.5 [ASI]

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