LM309K STEEL/NOPB [TI]

采用气密封装的 1A 5V 输出线性稳压器/LDO | NDS | 2 | 0 to 125;


型号：	LM309K STEEL/NOPB
厂家：	TEXAS INSTRUMENTS
描述：	采用气密封装的 1A 5V 输出线性稳压器/LDO \| NDS \| 2 \| 0 to 125 稳压器
文件：	总10页 (文件大小：291K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LM109,LM309

LM109/LM309 5-Volt Regulator

Literature Number: SNVS752A

April 1998

LM109/LM309

5-Volt Regulator

General Description

does improve transient response somewhat. Input bypass-

ing is needed, however, if the regulator is located very far

from the filter capacitor of the power supply. Stability is also

achieved by methods that provide very good rejection of load

or line transients as are usually seen with TTL logic.

The LM109 series are complete 5V regulators fabricated on

a single silicon chip. They are designed for local regulation

on digital logic cards, eliminating the distribution problems

association with single-point regulation. The devices are

available in two standard transistor packages. In the

solid-kovar TO-5 header, it can deliver output currents in

excess of 200 mA, if adequate heat sinking is provided. With

the TO-3 power package, the available output current is

greater than 1A.

Although designed primarily as a fixed-voltage regulator, the

output of the LM109 series can be set to voltages above 5V,

as shown. It is also possible to use the circuits as the control

element in precision regulators, taking advantage of the

good current-handling capability and the thermal overload

protection.

The regulators are essentially blowout proof. Current limiting

is included to limit the peak output current to a safe value. In

addition, thermal shutdown is provided to keep the IC from

overheating. If internal dissipation becomes too great, the

regulator will shut down to prevent excessive heating.

Features

n Specified to be compatible, worst case, with TTL and

DTL

n Output current in excess of 1A

n Internal thermal overload protection

n No external components required

Considerable effort was expended to make these devices

easy to use and to minimize the number of external compo-

nents. It is not necessary to bypass the output, although this

Schematic Diagram

DS007138-1

DS007138

www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Operating Junction Temperature Range

LM109

−55˚C to +150˚C

0˚C to +125˚C

LM309

Storage Temperature Range

Lead Temperature

(Soldering, 10 sec.)

−65˚C to +150˚C

Input Voltage

35V

300˚C

Power Dissipation

Internally Limited

Electrical Characteristics (Note 2)

Parameter

Conditions

LM109

Typ

LM309

Typ

Units

Max

Min

Max

5.3

Min

Output Voltage

T_j= 25˚C

4.7

5.05

4.0

4.8

5.05

4.0

5.2

Line Regulation

T_j= 25˚C

7.10V ≤ V_IN≤ 25V

T_j= 25˚C

Load Regulation

TO-39 Package

TO-3 Package

Output Voltage

5 mA ≤ I_OUT≤ 0.5A

5 mA ≤ I_OUT≤ 1.5A

7.40V ≤ V_IN≤ 25V,

100

5.4

100

5.25

4.6

4.75

5 mA ≤ I_OUT≤ I_MAX

P_MAX

Quiescent Current

7.40V ≤ V_IN≤ 25V

5 mA ≤ I_OUT≤ I_MAX

T_A= 25˚C

5.2

0.5

0.8

5.2

0.5

0.8

µV

Quiescent Current Change

Output Noise Voltage

10 Hz ≤ f ≤ 100 kHz

Long Term Stability

Ripple Rejection

Thermal Resistance,

Junction to Case

TO-39 Package

TO-3 Package

T_j= 25˚C

(Note 3)

˚C/W

2.5

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

functional, but do not guarantee specific performance limits.

Note 2: Unless otherwise specified, these specifications apply −55˚C ≤ T ≤ +150˚C for the LM109 and 0˚C ≤ T ≤ +125˚C for the LM309; V = 10V; and I

OUT

0.1A for the TO-39 package or I

= 0.5A for the TO-3 package. For the TO-39 package, I

= 0.2A and P

= 2.0W. For the TO-3 package, I

= 1.0A and

MAX

OUT

MAX

= 20W.

Note 3: Without a heat sink, the thermal resistance of the TO-39 package is about 150˚C/W, while that of the TO-3 package is approximately 35˚C/W. With a heat

sink, the effective thermal resistance can only approach the values specified, depending on the efficiency of the sink.

Note 4: Refer to RETS109H drawing for LM109H or RETS109K drawing for LM109K military specifications.

Connection Diagrams

Metal Can Packages

DS007138-33

DS007138-34

Order Number LM109H, LM109H/883 or LM309H

See NS Package Number H03A

Order Number LM109K STEEL or

LM309K STEEL

See NS Package Number K02A

Order Number LM109K/883

See NS Package Number K02C

www.national.com

5. Preventing latchoff for loads connected to negative

Application Hints

1. Bypass the input of the LM109 to ground with ≥ 0.2 µF

ceramic or solid tantalum capacitor if main filter capaci-

tor is more than 4 inches away.

voltage:

If the output of the LM109 is pulled negative by a high

current supply so that the output pin is more than 0.5V

negative with respect to the ground pin, the LM109 can latch

off. This can be prevented by clamping the ground pin to the

output pin with a germanium or Schottky diode as shown. A

silicon diode (1N4001) at the output is also needed to keep

the positive output from being pulled too far negative. The

10Ω resistor will raise +V_OUTby ≈ 0.05V.

2. Avoid insertion of regulator into “live” socket if input

voltage is greater than 10V. The output will rise to within

2V of the unregulated input if the ground pin does not

make contact, possibly damaging the load. The LM109

may also be damaged if a large output capacitor is

charged up, then discharged through the internal clamp

zener when the ground pin makes contact.

3. The output clamp zener is designed to absorb tran-

sients only. It will not clamp the output effectively if a

failure occurs in the internal power transistor structure.

Zener dynamic impedance is ≈ 4Ω. Continuous RMS

current into the zener should not exceed 0.5A.

4. Paralleling of LM109s for higher output current is not

recommended. Current sharing will be almost nonexist-

ent, leading to a current limit mode operation for devices

with the highest initial output voltage. The current limit

devices may also heat up to the thermal shutdown point

(≈ 175˚C). Long term reliability cannot be guaranteed

under these conditions.

DS007138-7

Crowbar Overvoltage Protection

Input Crowbar

Output Crowbar

DS007138-8

DS007138-9

*Zener is internal to LM109.

* Q1 must be able to withstand 7A continuous current if fusing is not used

at regulator input. LM109 bond wires will fuse at currents above 7A.

†

Q2 is selected for surge capability. Consideration must be given to filter

capacitor size, transformer impedance, and fuse blowing time.

††

Trip point is ≈ 7.5V.

Typical Performance Characteristics

Maximum Average

Power Dissipation (LM109K)

Maximum Average

Power Dissipation (LM309K)

Output Impedance

DS007138-18

DS007138-16

DS007138-17

www.national.com

Typical Performance Characteristics (Continued)

Maximum Average

Power Dissipation (LM109H)

Maximum Average

Power Dissipation (LM309H)

Ripple Rejection

DS007138-21

DS007138-19

DS007138-20

Current Limit

Characteristics (Note 5)

Thermally Induced Output

Voltage Variation

Ripple Rejection

DS007138-24

DS007138-22

DS007138-23

Note 5: Current limiting foldback characteristics are determined by input output differential, not by output voltage.

Input-Output Differential (V)

Output Voltage (V)

DS007138-26

DS007138-25

DS007138-27

www.national.com

Typical Performance Characteristics (Continued)

Quiescent Current

Output Voltage Noise

DS007138-30

DS007138-28

DS007138-29

Line Transient Response

Load Transient Response

DS007138-31

DS007138-32

Typical Applications

Fixed 5V Regulator

Adjustable Output Regulator

DS007138-4

DS007138-2

*Required if regulator is located more than 4" from power supply filter

capacitor.

†

Although no output capacitor is needed for stability, it does improve

transient response.

C2 should be used whenever long wires are used to connect to the load,

or when transient response is critical.

Note: Pin 3 electrically connected to case.

www.national.com

Typical Applications (Continued)

High Stability Regulator

DS007138-5

*Regulation better than 0.01%, load, line and temperature, can be obtained.

†

‡

Determines zener current. May be adjusted to minimize thermal drift.

Solid tantalum.

Current Regulator

DS007138-6

*Determines output current. If wirewound resistor is used, bypass with 0.1 µF.

www.national.com

Physical Dimensions inches (millimeters) unless otherwise noted

Metal Can Package (H)

Order Number LM109H, LM109H/883 or LM309H

NS Package Number H03A

Metal Can Package (K)

Order Number LM109K STEEL, LM309K STEEL

NS Package Number K02A

www.national.com

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

Metal Can Package (K)

Mil-Aero Product

Order Number LM109K/883

NS Package Number K02C

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

National Semiconductor

Corporation

Americas

National Semiconductor

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National Semiconductor

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Response Group

Tel: 65-2544466

Fax: 65-2504466

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English Tel: +44 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

Email: ap.support@nsc.com

www.national.com

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.

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LM309K STEEL/NOPB [TI]

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