LM1086IT-1.8 [NSC]

1.5A Low Dropout Positive Regulators; 1.5A低压差正稳压器


型号：	LM1086IT-1.8
厂家：	National Semiconductor
描述：	1.5A Low Dropout Positive Regulators 1.5A低压差正稳压器稳压器调节器输出元件局域网
文件：	总15页 (文件大小：819K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

June 2005

LM1086

1.5A Low Dropout Positive Regulators

General Description

Features

n Available in 1.8V, 2.5V, 2.85V, 3.3V, 3.45V, 5V and

Adjustable Versions

The LM1086 is a series of low dropout positive voltage

regulators with a maximum dropout of 1.5V at 1.5A of load

current. It has the same pin-out as National Semiconductor’s

industry standard LM317.

n Current Limiting and Thermal Protection

n Output Current

1.5A

The LM1086 is available in an adjustable version, which can

set the output voltage with only two external resistors. It is

also available in six fixed voltages: 1.8V, 2.5V, 2.85V, 3.3V,

3.45V and 5.0V. The fixed versions integrate the adjust

resistors.

n Line Regulation

n Load Regulation

0.015% (typical)

0.1% (typical)

Applications

n SCSI-2 Active Terminator

n High Efficiency Linear Regulators

n Battery Charger

The LM1086 circuit includes a zener trimmed bandgap ref-

erence, current limiting and thermal shutdown.

The LM1086 series is available in TO-220, TO-263, and LLP

packages. Refer to the LM1084 for the 5A version, and the

LM1085 for the 3A version.

n Post Regulation for Switching Supplies

n Constant Current Regulator

n Microprocessor Supply

Connection Diagrams

TO-220

TO-263

LLP

10094802

Top View

10094804

Top View

10094866

Pins 6, 7, and 8 must be tied together.

Top View

Application Circuit

Basic Functional Diagram, Adjustable Version

10094865

10094852

1.2V to 15V Adjustable Regulator

DS100948

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Ordering Information

Package

3-lead TO-263

Temperature Range

Part Number

LM1086IS-ADJ

LM1086ISX-ADJ

LM1086IS-1.8

Transport Media

Rails

NSC Drawing

−40˚C to +125˚C

Tape and Reel

Rails

LM1086ISX-1.8

LM1086IS-2.85

LM1086ISX-2.85

LM1086IS-3.3

Tape and Reel

Rails

Tape and Reel

Rails

LM1086ISX-3.3

LM1086IS-3.45

LM1086ISX-3.45

LM1086IS-5.0

Tape and Reel

Rails

TS3B

Tape and Reel

Rails

LM1086ISX-5.0

LM1086CS-ADJ

LM1086CSX-ADJ

LM1086CS-2.5

LM1086CSX-2.5

LM1086CS-2.85

LM1086CSX-2.85

LM1086CS-3.3

LM1086CSX-3.3

LM1086CS-5.0

LM1086CSX-5.0

LM1086IT-ADJ

LM1086IT-1.8

Tape and Reel

Rails

0˚C to +125˚C

Tape and Reel

Rails

Tape and Reel

Rails

Tape and Reel

Rails

Tape and Reel

Rails

Tape and Reel

Rails

3-lead TO-220

−40˚C to +125˚C

Rails

LM1086IT-2.85

LM1086IT-3.3

Rails

LM1086IT-5.0

Rails

T03B

0˚C to +125˚C

LM1086CT-ADJ

LM1086CT-2.85

LM1086CT-3.3

LM1086CT-5.0

LM1086ILD-ADJ

LM1086ILDX-ADJ

LM1086ILD-1.8

LM1086ILDX-1.8

LM1086ILD-2.5

LM1086ILDX-2.5

LM1086ILD-2.85

LM1086ILDX-2.85

LM1086ILD-3.3

LM1086ILDX-3.3

LM1086ILD-5.0

LM1086ILDX-5.0

Rails

8-Lead LLP

−40˚C to +125˚C

Rails

Tape and Reel

Rails

Tape and Reel

Rails

Tape and Reel

Rails

LDC008AA

Tape and Reel

Rails

Tape and Reel

Rails

Tape and Reel

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Simplified Schematic

10094834

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Storage Temperature Range

Lead Temperature

-65˚C to 150˚C

260˚C, to 10 sec

2000V

ESD Tolerance (Note 4)

Maximum Input-to-Output Voltage Differential

Operating Ratings (Note 1)

Junction Temperature Range (T_J) (Note 3)

LM1086-ADJ

LM1086-1.8

29V

27V

"C" Grade

LM1086-2.5

27V

Control Section

0˚C to 125˚C

0˚C to 150˚C

LM1086-2.85

27V

Output Section

LM1086-3.3

27V

"I" Grade

LM1086-3.45

Control Section

−40˚C to 125˚C

−40˚C to 150˚C

LM1086-5.0

25V

Output Section

Power Dissipation (Note 2)

Junction Temperature (T_J)(Note 3)

Internally Limited

150˚C

Electrical Characteristics

Typicals and limits appearing in normal type apply for T_J= 25˚C. Limits appearing in Boldface type apply over the entire junc-

tion temperature range for operation.

Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Symbol

Parameter

Conditions

Units

V_REF

Reference Voltage

LM1086-ADJ

I_OUT= 10mA, V_IN−V_OUT= 3V

10mA ≤I_OUT≤ I_{FULL LOAD}

1.238

1.250

1.262

1.225

1.250

1.270

1.5V ≤ V_IN−V_OUT≤ 15V (Note 7)

V_OUT

Output Voltage

(Note 7)

LM1086-1.8

1.782

1.8

1.818

I_OUT= 0mA, V_IN= 5V

1.764

1.8

1.836

0 ≤ I_OUT≤ I_{FULL LOAD}, 3.3V ≤ V_IN≤ 18V

LM1086-2.5

2.475

2.50

2.525

I_OUT= 0mA, V_IN= 5V

2.450

2.55

0 ≤ I_OUT≤ I_{FULL LOAD}, 4.0V ≤ V_IN≤ 18V

LM1086-2.85

2.82

2.85

2.88

I_OUT= 0mA, V_IN= 5V

2.79

2.85

2.91

0 ≤ I_OUT≤ I_{FULL LOAD}, 4.35V ≤ V_IN≤ 18V

LM1086-3.3

3.267

3.300

3.333

I_OUT= 0mA, V_IN= 5V

3.235

3.300

3.365

0 ≤ I_OUT≤ I_{FULL LOAD}, 4.75V ≤ V_IN≤ 18V

LM1086-3.45

3.415

3.381

3.45

3.484

3.519

I_OUT= 0mA, V_IN= 5V

0 ≤ I_OUT≤ I_{FULL LOAD}, 4.95V ≤ V_IN≤ 18V

LM1086-5.0

4.950

5.000

5.050

I_OUT= 0mA, V_IN= 8V

4.900

5.000

5.100

0 ≤ I_OUT≤ I_{FULL LOAD}, 6.5V ≤ V_IN≤ 20V

LM1086-ADJ

∆V_OUT

Line Regulation

(Note 8)

0.015

0.035

0.3

0.2

I_OUT=10mA, 1.5V≤ (V_IN-V_OUT) ≤ 15V

LM1086-1.8

I_OUT= 0mA, 3.3V ≤ V_IN≤ 18V

LM1086-2.5

0.6

0.3

I_OUT= 0mA, 4.0V ≤ V_IN≤ 18V

0.6

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Electrical Characteristics (Continued)

Typicals and limits appearing in normal type apply for T_J= 25˚C. Limits appearing in Boldface type apply over the entire junc-

tion temperature range for operation.

Min

(Note 6)

Typ

(Note 5)

0.3

0.6

0.5

1.0

0.5

1.0

0.5

1.0

0.1

0.2

Max

(Note 6)

Symbol

Parameter

Conditions

Units

LM1086-2.85

I_OUT= 0mA, 4.35V ≤ V_IN≤ 18V

LM1086-3.3

I_OUT= 0mA, 4.5V ≤ V_IN≤ 18V

LM1086-3.45

I_OUT= 0mA, 4.95V ≤ V_IN≤ 18V

LM1086-5.0

I_OUT= 0mA, 6.5V ≤ V_IN≤ 20V

LM1086-ADJ

∆V_OUT

Load Regulation

(Note 8)

0.3

0.4

(V_IN-V

) = 3V, 10mA ≤ I_OUT≤ I_{FULL LOAD}

OUT

LM1086-1.8 ,2.5, 2.85

V_IN= 5V, 0 ≤ I_OUT≤ I_{FULL LOAD}

LM1086-3.3, 3.45

V_IN= 5V, 0 ≤ I_OUT≤ I_{FULL LOAD}

LM1086-5.0

V_IN= 8V, 0 ≤ I_OUT≤ I_{FULL LOAD}

LM1086-ADJ, 1.8, 2.5,2.85, 3.3, 3.45, 5

∆V_REF, ∆V_OUT= 1%, I_OUT= 1.5A

LM1086-ADJ

Dropout Voltage

(Note 9)

1.3

1.5

I_LIMIT

Current Limit

V_IN−V_OUT= 5V

1.50

0.05

1.5

2.7

0.15

2.7

V_IN−V_OUT= 25V

LM1086-1.8,2.5, 2.85, 3.3, 3.45, V_IN= 8V

LM1086-5.0, V_IN= 10V

1.5

2.7

Minimum Load Current LM1086-ADJ

(Note 10)

V_IN−V_OUT= 25V

5.0

10.0

0.04

Quiescent Current

LM1086-1.8, 2.5, 2.85, V_IN≤ 18V

LM1086-3.3, V_IN≤ 18V

LM1086-3.45, V_IN≤ 18V

LM1086-5.0, V_IN≤ 20V

T_A= 25˚C, 30ms Pulse

f_RIPPLE= 120Hz, C_OUT= 25µF Tantalum,

I_OUT= 1.5A

5.0

Thermal Regulation

Ripple Rejection

0.008

%/W

LM1086-ADJ, C_ADJ= 25µF, (V_IN−V_O) = 3V

LM1086-1.8, 2.5, 2.85, V_IN= 6V

LM1086-3.3, V_IN= 6.3V

LM1086-3.45, V_IN= 6.3V

LM1086-5.0 V_IN= 8V

µA

Adjust Pin Current

Change

LM1086

120

10mA ≤ I_OUT≤ I_{FULL LOAD}

1.5V ≤ (V_IN−V_OUT) ≤ 15V

0.2

0.5

µA

Temperature Stability

Long Term Stability

RMS Noise

T_A= 125˚C, 1000Hrs

0.3

1.0

10Hz ≤ f≤ 10kHz

0.003

(% of V_OUT

)

θ_JC

Thermal Resistance

Junction-to-Case

3-Lead TO-263: Control Section/Output

1.5/4.0

˚C/W

Section

3-Lead TO-220: Control Section/Output

Section

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Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Power dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery in Application Notes. The value θ for the LLP package

is specifically dependent on PCB trace area, trace material, and the number of thermal vias. For improved thermal resistance and power dissipation for the LLP

package, refer to Application Note AN-1187.

Note 3: The maximum power dissipation is a function of T

, θ , and T . The maximum allowable power dissipation at any ambient temperature

JA A

J(MAX)

is P = (T

–T )/θ . All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.

J(MAX)

A JA

Note 4: For testing purposes, ESD was applied using human body model, 1.5kΩ in series with 100pF.

Note 5: Typical Values represent the most likely parametric norm.

Note 6: All limits are guaranteed by testing or statistical analysis.

Note 7: I

is defined in the current limit curves. The I

Curve defines current limit as a function of input-to-output voltage. Note that 15W power

FULL LOAD

dissipation for the LM1086 is only achievable over a limited range of input-to-output voltage.

Note 8: Load and line regulation are measured at constant junction temperature, and 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 9: Dropout voltage is specified over the full output current range of the device.

Note 10: The minimum output current required to maintain regulation.

Typical Performance Characteristics

Dropout Voltage vs. Output Current

Short-Circuit Current vs. Input/Output Difference

10094837

10094863

Load Regulation vs. Temperature

Percent Change in Output Voltage vs. Temperature

10094838

10094899

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Typical Performance Characteristics (Continued)

Adjust Pin Current vs. Temperature

Maximum Power Dissipation vs. Temperature

10094842

10094898

Ripple Rejection vs. Frequency (LM1086-Adj.)

Ripple Rejection vs. Output Current (LM1086-Adj.)

10094844

10094843

Ripple Rejection vs. Frequency (LM1086-5)

Ripple Rejection vs. Output Current (LM1086-5)

10094846

10094845

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Typical Performance Characteristics (Continued)

Line Transient Response

Load Transient Response

10094847

10094848

For fixed voltage devices, R1 and R2 are integrated inside

the devices.

Application Note

GENERAL

Figure 1 shows a basic functional diagram for the LM1086-

Adj (excluding protection circuitry) . The topology is basically

that of the LM317 except for the pass transistor. Instead of a

Darlingtion NPN with its two diode voltage drop, the LM1086

uses a single NPN. This results in a lower dropout voltage.

The structure of the pass transistor is also known as a quasi

LDO. The advantage a quasi LDO over a PNP LDO is its

inherently lower quiescent current. The LM1086 is guaran-

teed to provide a minimum dropout voltage 1.5V over tem-

perature, at full load.

10094817

FIGURE 2. Basic Adjustable Regulator

STABILITY CONSIDERATION

Stability consideration primarily concern the phase response

of the feedback loop. In order for stable operation, the loop

must maintain negative feedback. The LM1086 requires a

certain amount series resistance with capacitive loads. This

series resistance introduces a zero within the loop to in-

crease phase margin and thus increase stability. The equiva-

lent series resistance (ESR) of solid tantalum or aluminum

electrolytic capacitors is used to provide the appropriate zero

(approximately 500 kHz).

10094865

FIGURE 1. Basic Functional Diagram for the LM1086,

excluding Protection circuitry

The Aluminum electrolytic are less expensive than tantal-

ums, but their ESR varies exponentially at cold tempera-

tures; therefore requiring close examination when choosing

the desired transient response over temperature. Tantalums

are a convenient choice because their ESR varies less than

2:1 over temperature.

OUTPUT VOLTAGE

The LM1086 adjustable version develops at 1.25V reference

voltage, (V_REF), between the output and the adjust terminal.

As shown in figure 2, this voltage is applied across resistor

R1 to generate a constant current I1. This constant current

then flows through R2. The resulting voltage drop across R2

adds to the reference voltage to sets the desired output

voltage.

The recommended load/decoupling capacitance is a 10uF

tantalum or a 50uF aluminum. These values will assure

stability for the majority of applications.

The adjustable versions allows an additional capacitor to be

used at the ADJ pin to increase ripple rejection. If this is done

the output capacitor should be increased to 22uF for tantal-

ums or to 150uF for aluminum.

The current I_ADJfrom the adjustment terminal introduces an

output error . But since it is small (120uA max), it becomes

negligible when R1 is in the 100Ω range.

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When the adjustable regulator is used (Figure 4), the best

performance is obtained with the positive side of the resistor

R1 tied directly to the output terminal of the regulator rather

than near the load. This eliminates line drops from appearing

effectively in series with the reference and degrading regu-

lation. For example, a 5V regulator with 0.05Ω resistance

between the regulator and load will have a load regulation

due to line resistance of 0.05Ω x I_L. If R1 (=125Ω) is con-

nected near the load the effective line resistance will be

0.05Ω (1 + R2/R1) or in this case, it is 4 times worse. In

addition, the ground side of the resistor R2 can be returned

near the ground of the load to provide remote ground sens-

ing and improve load regulation.

Application Note (Continued)

Capacitors other than tantalum or aluminum can be used at

the adjust pin and the input pin. A 10uF capacitor is a

reasonable value at the input. See Ripple Rejection section

regarding the value for the adjust pin capacitor.

It is desirable to have large output capacitance for applica-

tions that entail large changes in load current (microproces-

sors for example). The higher the capacitance, the larger the

available charge per demand. It is also desirable to provide

low ESR to reduce the change in output voltage:

∆V = ∆I x ESR

It is common practice to use several tantalum and ceramic

capacitors in parallel to reduce this change in the output

voltage by reducing the overall ESR.

Output capacitance can be increased indefinitely to improve

transient response and stability.

RIPPLE REJECTION

Ripple rejection is a function of the open loop gain within the

feed-back loop (refer to Figure 1 and Figure 2). The LM1086

exhibits 75dB of ripple rejection (typ.). When adjusted for

voltages higher than V_REF, the ripple rejection decreases as

function of adjustment gain: (1+R1/R2) or V_O/V_REF. There-

fore a 5V adjustment decreases ripple rejection by a factor of

four (−12dB); Output ripple increases as adjustment voltage

increases.

However, the adjustable version allows this degradation of

ripple rejection to be compensated. The adjust terminal can

be bypassed to ground with a capacitor (C_ADJ). The imped-

ance of the C_ADJshould be equal to or less than R1 at the

desired ripple frequency. This bypass capacitor prevents

ripple from being amplified as the output voltage is in-

creased.

10094819

FIGURE 4. Best Load Regulation using Adjustable

Output Regulator

PROTECTION DIODES

1/(2π*f_RIPPLE*C_ADJ) ≤ R₁

Under normal operation, the LM1086 regulator does not

need any protection diode. With the adjustable device, the

internal resistance between the adjustment and output ter-

minals limits the current. No diode is needed to divert the

current around the regulator even with a capacitor on the

adjustment terminal. The adjust pin can take a transient

signal of 25V with respect to the output voltage without

damaging the device.

LOAD REGULATION

The LM1086 regulates the voltage that appears between its

output and ground pins, or between its output and adjust

pins. In some cases, line resistances can introduce errors to

the voltage across the load. To obtain the best load regula-

tion, a few precautions are needed.

Figure 3 shows a typical application using a fixed output

regulator. Rt1 and Rt2 are the line resistances. V_LOADis less

than the V_OUTby the sum of the voltage drops along the line

resistances. In this case, the load regulation seen at the

R_LOADwould be degraded from the data sheet specification.

To improve this, the load should be tied directly to the output

terminal on the positive side and directly tied to the ground

terminal on the negative side.

When an output capacitor is connected to a regulator and

the input is shorted, the output capacitor will discharge into

the output of the regulator. The discharge current depends

on the value of the capacitor, the output voltage of the

regulator, and rate of decrease of V_IN. In the LM1086 regu-

lator, the internal diode between the output and input pins

can withstand microsecond surge currents of 10A to 20A.

With an extremely large output capacitor (≥1000 µf), and

with input instantaneously shorted to ground, the regulator

could be damaged. In this case, an external diode is recom-

mended between the output and input pins to protect the

regulator, shown in Figure 5.

10094818

FIGURE 3. Typical Application using Fixed Output

Regulator

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Application Note (Continued)

10094816

FIGURE 6. Power Dissipation Diagram

Once the device power is determined, the maximum allow-

able (θ_JA(max)) is calculated as:

θ_{JA (max)}= T_R(max)/P_D= T_J(max)− T_A(max))/P_D

10094815

The LM1086 has different temperature specifications for two

different sections of the IC: the control section and the output

section. The Electrical Characteristics table shows the junc-

tion to case thermal resistances for each of these sections,

while the maximum junction temperatures (T_J(max)) for each

section is listed in the Absolute Maximum section of the

datasheet. T_J(max)is 125˚C for the control section, while

T_J(max)is 150˚C for the output section.

FIGURE 5. Regulator with Protection Diode

OVERLOAD RECOVERY

Overload recovery refers to regulator’s ability to recover from

a short circuited output. A key factor in the recovery process

is the current limiting used to protect the output from drawing

too much power. The current limiting circuit reduces the

output current as the input to output differential increases.

Refer to short circuit curve in the curve section.

_{JA (max)}should be calculated separately for each section as

follows:

θ_JA(max, CONTROL SECTION) = (125˚C for T_A(max))/P_D

θ_JA(max, OUTPUT SECTION) = (150˚C for T_A(max))/P_D

The required heat sink is determined by calculating its re-

quired thermal resistance (θ_HA(max)).

θ_HA(max)= θ_JA(max)− (θ_JC+ θ_CH

θ_{HA (max)}should be calculated twice as follows:

θ_{HA (max)}= θ_JA(max, CONTROL SECTION) - (θ_JC(CON-

TROL SECTION) + θ_CH

θ_{HA (max)}= θ_JA(max, OUTPUT SECTION) - (θ_JC(OUTPUT

SECTION) + θ_CH

If thermal compound is used, θ_CHcan be estimated at 0.2

C/W. If the case is soldered to the heat sink, then a θ_CHcan

be estimated as 0 C/W.

During normal start-up, the input to output differential is

small since the output follows the input. But, if the output is

shorted, then the recovery involves a large input to output

differential. Sometimes during this condition the current lim-

iting circuit is slow in recovering. If the limited current is too

low to develop a voltage at the output, the voltage will

stabilize at a lower level. Under these conditions it may be

necessary to recycle the power of the regulator in order to

get the smaller differential voltage and thus adequate start

up conditions. Refer to curve section for the short circuit

current vs. input differential voltage.

)

THERMAL CONSIDERATIONS

ICs heats up when in operation, and power consumption is

one factor in how hot it gets. The other factor is how well the

heat is dissipated. Heat dissipation is predictable by knowing

the thermal resistance between the IC and ambient (θ_JA).

Thermal resistance has units of temperature per power (C/

W). The higher the thermal resistance, the hotter the IC.

After, θ_{HA (max)}is calculated for each section, choose the

lower of the two θ_{HA (max)}values to determine the appropri-

ate heat sink.

If PC board copper is going to be used as a heat sink, then

Figure 7 can be used to determine the appropriate area

(size) of copper foil required.

The LM1086 specifies the thermal resistance for each pack-

age as junction to case (θ_JC). In order to get the total

resistance to ambient (θ_JA), two other thermal resistance

must be added, one for case to heat-sink (θ_CH) and one for

heatsink to ambient (θ_HA). The junction temperature can be

predicted as follows:

T_J= T_A+ P_D(θ_JC+ θ_CH+ θ_HA) = T_A+ P_Dθ_JA

T_Jis junction temperature, T_Ais ambient temperature, and

P_Dis the power consumption of the device. Device power

consumption is calculated as follows:

I_IN= I_L+ I_G

P_D= (V_IN−V_OUT) I_L+ V_{IN G}

Figure 6 shows the voltages and currents which are present

in the circuit.

10094864

FIGURE 7. Heat sink thermal Resistance vs. Area

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Typical Applications

10094854

10094849

Battery Charger

5V to 3.3V, 1.5A Regulator

10094850

10094855

Adjustable 5V

Adjustable Fixed Regulator

10094856

Regulator with Reference

10094852

1.2V to 15V Adjustable Regulator

10094857

High Current Lamp Driver Protection

10094853

5V Regulator with Shutdown

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Typical Applications (Continued)

10094860

Ripple Rejection Enhancement

10094859

Battery Backup Regulated Supply

10094861

Automatic Light control

10094858

Remote Sensing

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Typical Applications (Continued)

10094851

SCSI-2 Active termination

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Physical Dimensions inches (millimeters) unless otherwise noted

3-Lead TO-263

NS Package Number TS3B

3-Lead TO-220

NS Package Number T03B

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

8-Lead LLP

NS Package Number LDC008AA

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves

the right at any time without notice to change said circuitry and specifications.

For the most current product information visit us at www.national.com.

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LM1086IT-1.8 [NSC]

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