LM138QML [TI]

LM138QML;


型号：	LM138QML
厂家：	TEXAS INSTRUMENTS
描述：	LM138QML
文件：	总35页 (文件大小：1143K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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LM138QML

ZHCSH04 –OCTOBER 2017

LM138QML 军用级 5A 可调输出线性稳压器

1 特性

LM138QML 器件的一项独特功能是可提供基于时间的

电流限制。电流限制电路支持稳压器在较短的时间内牵

引高达 12A 的峰值电流。因此，LM138QML 器件能够

在高瞬态负载下使用，并且可加快满载条件下的启动速

度。在持续负载条件下，电流限制会降至安全的值，以

保护稳压器。此外，芯片中还包含热过载保护和安全区

域保护功能（针对功率晶体管）。即使调节引脚意外断

开，过载保护功能仍然起作用。

•

按照德州仪器 (TI) 军用级流程进行制造和测试

额定峰值输出电流为 7A

额定输出电流为 5A

宽温度范围：-55°C 至 150°C

低至 1.2V 的可调节输出

额定热调节

电流限制在各种温度下保持恒定

已通过 P⁺产品增强性能测试

输出具有短路保护

通常不需要使用电容器，除非器件的位置距离输入滤波

电容器超过 6 英寸，此时需要使用输入旁路。可以添

加输出电容器以改善瞬态响应，而旁路掉调节引脚可提

高稳压器的纹波抑制能力。

2 应用

•

可调节电源

除了替代固定稳压器或分立式设计之外，LM138QML

也可应用于各种其他应用。由于该稳压器属于“浮动型”

稳压器，并且仅接收输入到输出差分电压，因此，只要

不超过最大输入到输出差分电压，就可以调节几百伏特

的电源电压；换而言之，不会让输出发生接地短路故

障。

恒定电流稳压器

电池充电器

3 说明

LM138QML 可调节 3 端子正电压稳压器能够在 1.2V

至 32V 输出范围内提供超过 5A 的电流。该器件极易

使用，并且仅需要 2 个电阻器即可设置输出电压。电

路设计精心细致，可实现出色的负载和线路调节，并且

可与许多商用电源相媲美。

器件信息⁽¹⁾

器件型号

LM138K-MIL

等级

封装

军用

TO-3 (2)

裸片

LM138KG-MD8

LM138KG-MW8

晶圆

(1) 如需了解所有可用封装，请参阅数据表末尾的可订购产品附

录。

典型应用电路

LM138QML

V_OUT

V_IN

I₁

V_REF

ADJ

V_OUT

I_ADJ

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

English Data Sheet: SNVSAA9

LM138QML

ZHCSH04 –OCTOBER 2017

www.ti.com.cn

7.4 Device Functional Modes........................................ 11

Application and Implementation ........................ 12

8.1 Application Information............................................ 12

8.2 Typical Applications ................................................ 13

8.3 System Examples ................................................... 17

Power Supply Recommendations...................... 29

特性.......................................................................... 1

应用.......................................................................... 1

说明.......................................................................... 1

修订历史记录 ........................................................... 2

Pin Configuration and Functions......................... 3

Specifications......................................................... 4

6.1 Absolute Maximum Ratings ...................................... 4

6.2 Recommended Operating Conditions....................... 4

6.3 Thermal Information.................................................. 5

6.4 Electrical Characteristics........................................... 5

6.5 Quality Conformance Inspection............................... 6

6.6 Typical Performance Characteristics ........................ 7

Detailed Description ............................................ 10

7.1 Overview ................................................................. 10

7.2 Functional Block Diagram ....................................... 10

7.3 Feature Description................................................. 10

10 Layout................................................................... 29

10.1 Layout Guidelines ................................................. 29

10.2 Layout Example .................................................... 29

11 器件和文档支持 ..................................................... 30

11.1 接收文档更新通知 ................................................. 30

11.2 社区资源................................................................ 30

11.3 商标....................................................................... 30

11.4 静电放电警告......................................................... 30

11.5 Glossary................................................................ 30

12 机械、封装和可订购信息....................................... 30

4 修订历史记录

日期

修订版本

说明

2017 年 10 月

初始发行版

LM138QML

www.ti.com.cn

ZHCSH04 –OCTOBER 2017

5 Pin Configuration and Functions

K Package

2-Pin TO-3

Bottom View

V_IN

ADJUSTMENT

CASE IS

OUTPUT

Package Number K0002C

Pin Functions

I/O

DESCRIPTION

NAME

ADJ

NO.

Output voltage adjustment pin. Connect to a resistor divider to set V_O.

V_IN

Supply input pin.

V_OUT

Case

Voltage output pin.

LM138QML

ZHCSH04 –OCTOBER 2017

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6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)⁽¹⁾

MIN

MAX

UNIT

Power dissipation

Internally limited

Input and output voltage differential

Storage temperature, T_stg

–0.3

–65

150

300

°C

Lead temperature (soldering, 10 seconds)

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

6.2 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN

–55

MAX

150

UNIT

°C

Operating temperature, T_J

Input-to-output voltage differential

Output current

LM138QML

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ZHCSH04 –OCTOBER 2017

6.3 Thermal Information

LM138QML

THERMAL METRIC⁽¹⁾

K (TO-3)

2 PINS

42.8

UNIT

R_θJA

R_θJC(top)

ψ_JT

Junction-to-ambient thermal resistance

°C/W

Junction-to-case (top) thermal resistance

Junction-to-top characterization parameter

Junction-to-board characterization parameter

3.3

2.5

ψ_JB

37.4

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.4 Electrical Characteristics

Values apply for V_IN– V_OUT= 5 V; and I_OUT= 10 mA (unless otherwise noted)⁽¹⁾

SUB-

PARAMETER

TEST CONDITIONS

V_IN– V_OUT= 3 V⁽³⁾

MIN

TYP⁽²⁾

MAX UNIT

GROUPS

[1, 2, 3]

[1]

1.19

–3.5

–14

1.29

V_IN– V_OUT= 3 V, I_OUT= 5 A

V_IN– V_OUT= 5 V, I_OUT= 7 A

V_IN– V_OUT= 35 V

V_REF

Reference voltage

1.29

3.5

V_IN– V_OUT= 35 V, I_OUT= 150 mA

3 V ≤ (V_IN– V_OUT) ≤ 35 V

3.3 V ≤ (V_IN– V_OUT) ≤ 35 V

V_RLINE

Line regulation⁽⁴⁾

Load regulation⁽⁴⁾

[2, 3]

V_IN– V_OUT= 3 V, 10 mA ≤ I_OUT≤ 5 A,

V_OUT= V_REF

[1]

–3.8

–8

3.8

V_IN– V_OUT= 3.3 V, 10 mA ≤ I_OUT≤ 5 A,

V_OUT= V_REF

[2, 3]

V_RLOAD

[1]

–3.8

–8

3.8

V_IN– V_OUT= 35 V, 10 mA ≤ I_OUT≤ 150

mA, V_OUT= V_REF

[2, 3]

V_IN– V_OUT= 10 V, pulse = 20 ms,

I_OUT= 1 A⁽⁵⁾

V_IN– V_OUT= 3 V⁽³⁾

V_RTH

I_ADJ

Thermal regulation

[1]

0.002

0.01 %/W

[1, 2, 3]

100

μA

Adjustment pin current

V_IN– V_OUT= 35 V

3 V ≤ (V_IN– V_OUT) ≤ 35 V⁽³⁾

100

–5

0.5

0.2

3.5

ΔI_ADJ

Adjustment pin current change

μA

10 mA ≤ I_OUT≤ 5 A

V_IN– V_OUT= 3 V, V_OUT= 1.4 V⁽³⁾

V_IN– V_OUT= 35 V, V_OUT= 1.4 V

I_LOAD(MIN)Minimum load current

V_IN– V_OUT= 10 V, T = 0.5 ms,

V_OUT= 0 V

[1, 2, 3]

[4]

I_CL

Current limit

T = 5 ms, V_OUT= 0 V

V_OUT= V_REF, e_IN= 1 V_RMS, f = 120 Hz,

I_OUT= 500 mA⁽⁶⁾

ΔV_R/ΔV_INRipple rejection ratio

(1) These specifications are applicable for power dissipations up to 50W. Power dissipation is specified at these values up to 15-V input-

output differential. Above 15-V differential, power dissipation will be limited by internal protection circuitry. All limits (that is, the numbers

in the minimum and maximum columns) are specified to TI's AOQL (Average Outgoing Quality Level).

(2) Typical figures are at T_A= 25°C, and represent most likely parametric norms. Test limits are ensured to Texas Instruments' average

outgoing quality level (AOQL).

(3) V_IN– V_OUT= 3.3 V at –55°C and 125°C.

(4) Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

heating effects are covered under the specifications for thermal regulation.

(5) Datalog reading in mV, 0.01% = 1.19 mV.

(6) Family board not required for this device.

LM138QML

ZHCSH04 –OCTOBER 2017

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6.5 Quality Conformance Inspection

MIL-STD-883, Method 5005 - Group A

SUBGROUP

DESCRIPTION

Static tests at

TEMPERATURE (°C)

125

–55

Static tests at

Dynamic tests at

Functional tests at

Switching tests at

Setting time at

125

–55

125

–55

125

–55

Setting time at

125

–55

Setting time at

LM138QML

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ZHCSH04 –OCTOBER 2017

6.6 Typical Performance Characteristics

图 1. Current Limit

图 2. Current Limit

图 3. Current Limit

图 4. Load Regulation

图 6. Adjustment Current

图 5. Dropout Voltage

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ZHCSH04 –OCTOBER 2017

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Typical Performance Characteristics (接下页)

图 7. Temperature Stability

图 8. Output Impedance

图 10. Ripple Rejection

图 9. Minimum Operating Current

图 11. Ripple Rejection

图 12. Ripple Rejection

LM138QML

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ZHCSH04 –OCTOBER 2017

Typical Performance Characteristics (接下页)

图 13. Line Transient Response

图 14. Load Transient Response

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ZHCSH04 –OCTOBER 2017

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7 Detailed Description

7.1 Overview

The LM138QML device is an adjustable, three-terminal, positive-voltage regulator capable of supplying more

than 5 A over an output-voltage range of 1.2 V to 32 V. It requires only two external resistors to set the output

voltage. The LM138QML device features a typical line regulation of 0.005% and typical load regulation of 0.1%. It

includes time-dependent current limiting, thermal overload protection, and safe operating area protection.

Overload protection remains functional even if the ADJUST terminal is disconnected.

The LM138QML devices are versatile in their applications, including uses in programmable output regulation and

local on-card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the

LM138QML device can function as a precision current regulator. An optional output capacitor can be added to

improve transient response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios,

which are difficult to achieve with standard three-terminal regulators.

7.2 Functional Block Diagram

V_IN

310

190

5.6 k

Q21

Q10

R19

370

Q25

R18

130

6.3 V

R16

6.7 k

R17

12 k

Q14

Q18

Q26

Q20

Q27

Q16

200 k

5 pF

R23

18 k

R21

400

Q13

R27

4 k

R22

160

12.4 k

Q21

Q15

R20

13 k

130

6.3 V

Q19

Q24

Q17

6.3 V

Q11 Q12

30 pF

R15

2.4 k

R24

160

30 pF

180

R10

4.1 k

R13

5.1 k

R11

5.8 k

R12

R14

12 k

R25

R26

0.03

V_OUT

ADJ

6 V

7.3 Feature Description

7.3.1 NPN Darlington Output Drive

NPN Darlington output topology provides naturally low output impedance and an output capacitor is optional. To

support maximum current and lowest temperature, 3-V headroom is recommended (V_I– V_O).

7.3.2 Overload Block

Overcurrent and overtemperature shutdown protects the device against overload or damage from operating in

excessive heat.

7.3.3 Programmable Feedback

An op amp with 1.25-V offset input at the ADJUST terminal provides easy output voltage or current, but not both,

programming. For current regulation applications, a single resistor whose resistance value is 1.25 V/I_Oand power

rating is greater than 1.25 V²/R must be used. For voltage regulation applications, two resistors set the output

voltage.

LM138QML

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ZHCSH04 –OCTOBER 2017

7.4 Device Functional Modes

7.4.1 Normal Operation

The device OUTPUT pin sources current necessary to make the OUTPUT pin 1.25-V greater than the ADJUST

terminal to provide output regulation.

7.4.2 Operation With Low Input Voltage

The device requires up to 3-V headroom (V_I– V_O) to operate in regulation. With less headroom, the device may

drop out and the OUTPUT voltage is then the INPUT voltage minus the drop out voltage.

7.4.3 Operation at Light Loads

The device passes its bias current to the OUTPUT pin. The load or feedback must consume this minimum

current for regulation or the output may be too high. A 250-Ω feedback resistor between OUTPUT and ADJUST

consumes the worst case minimum load current of 5 mA.

7.4.4 Operation in Self Protection

When an overload occurs, the device shuts down the Darlington NPN output stage or reduces the output current

to prevent device damage. The device automatically resets from the overload. The output may be reduced or

alternate between on and off until the overload is removed.

LM138QML

ZHCSH04 –OCTOBER 2017

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8 Application and Implementation

注

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

In operation, the LM138QML device develops a nominal 1.25-V reference voltage, V_REF, between the output and

adjustment terminal. The reference voltage is impressed across program resistor R₁and, since the voltage is

constant, a constant current I₁then flows through the output set resistor R₂, giving an output voltage of:

(1)

LM138QML

V_OUT

V_IN

I₁

V_REF

ADJ

V_OUT

I_ADJ

Because the 50-μA current from the adjustment terminal represents an error term, the LM138QML was designed

to minimize I_ADJand make it very constant with line and load changes. To do this, all quiescent operating current

is returned to the output establishing a minimum load current requirement. If there is insufficient load on the

output, the output rises.

LM138QML

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ZHCSH04 –OCTOBER 2017

8.2 Typical Applications

8.2.1 Constant 5-V Regulator

D1**

1N4002

LM138QML

V_IN

V_OUT

††

V_IN

V_OUT

ADJ

270ꢀ

D2^†*

1N4002

†

C_OUT

C_IN*

0.1…F

1…F

C_ADJ

10…F

820ꢀ

GND

*Needed if device is more than 6 inches from filter

capacitors

†Optionalœœimproves transient response

**Recommended if C_OUTis used

R 2

≈

’

◊

††

V_OUT= 1.25V 1 +

+ I

(

R 2

)

∆

ADJ

†*Recommended if C_ADJis used

图 15. Constant 5-V Regulator

8.2.1.1 Design Requirements

表 1. Design Parameters

PART

NUMBER/VALUE

PARAMETER

DESCRIPTION

The LM138QML produces a typical 1.24-V potential between the OUTPUT and ADJUST

pins; therefore, placing a 270-Ω resistor between the OUTPUT and ADJUST pins causes

4.6 mA to flow through R1 and R2

Feedback resistor 1 (R1)

Feedback resistor 2 (R2)

270 Ω

To achieve a 5-V output, the sum of the voltages across R1 and R2 must equal 5 V.

Therefore, V_R2must equal 3.76 V when 4.6 mA is flowing through it. R2 = V_R2/ I = 3.76 V

/ 4.6 mA = ~820 Ω.

820 Ω

0.1 µF of input capacitance helps filter out unwanted noise, especially if the regulator is

located far from the power supply filter capacitors.

Input capacitor (C_IN

Output capacitor (C_OUT

Adjust capacitor (C_ADJ

)

0.1 µF

1 µF

The regulator is stable without any output capacitance, but adding a 1-µF capacitor

improves the transient response.

)

A 10-µF capacitor bypassing the ADJUST pin to ground improves the regulators ripple

rejection.

)

10 µF

Protection diode D1 is recommended if C_OUTis used. The diode provides a low-

impedance discharge path to prevent the capacitor from discharging into the output of the

regulator (see Protection Diodes).

Protection diode 1 (D1)

Protection diode 2 (D2)

1N4002

Protection diode D2 is recommended if C_ADJis used. The diode provides a low-impedance

discharge path to prevent the capacitor from discharging into the output of the regulator

(see Protection Diodes).

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ZHCSH04 –OCTOBER 2017

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8.2.1.2 Detailed Design Procedure

8.2.1.2.1 External Capacitors

An input bypass capacitor is recommended. A 0.1-μF disc or 1-μF solid tantalum on the input is suitable input

bypassing for almost all applications. The device is more sensitive to the absence of input bypassing when

adjustment or output capacitors are used but the above values will eliminate the possibility of problems.

The adjustment terminal can be bypassed to ground on the LM138QML to improve ripple rejection. This bypass

capacitor prevents ripple from being amplified as the output voltage is increased. With a 10-μF bypass capacitor,

75-dB ripple rejection is obtainable at any output level. Increases over 20 μF do not appreciably improve the

ripple rejection at frequencies above 120 Hz. If the bypass capacitor is used, it is sometimes necessary to

include protection diodes to prevent the capacitor from discharging through internal low current paths and

damaging the device.

In general, the best type of capacitors to use are solid tantalum. Solid tantalum capacitors have low impedance

even at high frequencies. Depending upon capacitor construction, it takes about 25 μF in aluminum electrolytic to

equal 1-μF solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies; however,

some types have a large decrease in capacitance at frequencies around 0.5 MHz. For this reason, a 0.01-μF disc

may seem to work better than a 0.1-μF disc as a bypass.

Although the LM138QML is stable with no output capacitors, like any feedback circuit, certain values of external

capacitance can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1-μF solid

tantalum (or 25-μF aluminum electrolytic) on the output swamps this effect and insures stability.

8.2.1.2.2 Load Regulation

The LM138QML device is capable of providing extremely good load regulation but a few precautions are needed

to obtain maximum performance. The current set resistor connected between the adjustment terminal and the

output terminal (usually 240 Ω) should be tied directly to the output of the regulator (case) rather than near the

load; this eliminates line drops from appearing effectively in series with the reference and degrading regulation.

For example, a 15-V regulator with 0.05-Ω resistance between the regulator and load will have a load regulation

due to line resistance of 0.05 Ω × I_L. If the set resistor is connected near the load the effective line resistance will

be 0.05 Ω (1 + R2/R1) or in this case, 11.5 times worse.

图 16 shows the effect of resistance between the regulator and 240-Ω set resistor.

LM138QML

R_S

V_IN

V_OUT

V_IN

V_OUT

ADJ

R1*

240

图 16. Regulator With Line Resistance in Output Lead

With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor by using two

separate leads to the case. The ground of R2 can be returned near the ground of the load to provide remote

ground sensing and improve load regulation.

8.2.1.2.3 Protection Diodes

When external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes to

prevent the capacitors from discharging through low current points into the regulator. Most 20-μF capacitors have

low enough internal series resistance to deliver 20-A spikes when shorted. Although the surge is short, there is

enough energy to damage parts of the IC.

LM138QML

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When an output capacitor is connected to a regulator and the input is shorted, the output capacitor discharges

into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage

of the regulator, and the rate of decrease of V_IN. In the LM138QML, this discharge path is through a large

junction that is able to sustain 25-A surge with no problem; this is not true of other types of positive regulators.

For output capacitors of 100 μF or less at an output of 15 V or less, there is no need to use diodes.

The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs

when either the input or output is shorted. Internal to the LM138QML is a 50-Ω resistor which limits the peak

discharge current. No protection is needed for output voltages of 25-V or less and 10-μF capacitance. 图 17

shows an LM138QML with protection diodes included for use with outputs greater than 25 V and high values of

output capacitance.

1N4002

LM138QML

V_IN

V_OUT

ADJ

120

1N4002

10 µF

D1 protects against C1

D2 protects against C2

≈

’

V_OUT= 1.25 V 1+

+ I_ADJR2

∆

◊

图 17. Regulator With Protection Diodes

8.2.1.3 Application Curves

图 18. Regulator Start-Up

图 19. Regulator Shutdown

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图 20. Regulator Response to Load Stop

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ZHCSH04 –OCTOBER 2017

8.3 System Examples

LM138QML

V_OUT

V_IN

V_OUT= 15 V

ADJ

120

1.4 k

V_REF= 6.95 V

LM329

图 21. Regulator and Voltage Reference

LM138QML

VIN > 28 V

V_OUT††

V_OUT

V_IN

ADJ

R1**

240

C1*

0.1 µF

C2†

1 µF

R2**

5 k

Full output current not available at high input-output voltages

† Optional—improves transient response. Output capacitors in the range of 1 μF to 1000 μF of aluminum or tantalum

electrolytic are commonly used to provide improved output impedance and rejection of transients.

* Needed if device is more than 6 inches from filter capacitors.

≈

’

†† V_OUT= 1.25 V 1+

+ I_ADJ(R ₂)

∆

◊

** R1, R2 as an assembly can be ordered from Bourns:

MIL part no. 7105A-AT2-502

COMM part no. 7105A-AT7-502

图 22. 1.2-V to 25-V Adjustable Regulator

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System Examples (接下页)

LM138QML

OUT

V_OUT

V_IN

ADJ

1.2 k

HEATER

LM334

100 k

GAIN

图 23. Temperature Controller

LM138QML

OUT

> 4 V

V_IN

V_OUT

ADJ

1.2 k

375

IN457

10 k*

LM336

IN457

2 k

OUTPUT

ADJUST

* Adjust for 3.75 V across R1

图 24. Precision Power Regulator With Low Temperature Coefficient

LM138QML

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ZHCSH04 –OCTOBER 2017

System Examples (接下页)

LM138QML

V_OUT

15 V

V_IN

ADJ

120

0.1 µF

1N4002

50 k

1.37 k

2N2905

100 µF

图 25. Slow Turnon 15-V Regulator

LM138QML

V_IN

V_OUT

ADJ

D1*

1N4002

240

0.1 µF

1 µF†

10 µF

5 k

† Solid tantalum

* Discharges C1 if output is shorted to ground

图 26. Adjustable Regulator With Improved Ripple Rejection

LM138QML

V_OUT

10 V

V_IN

15 V

V_OUT

V_IN

ADJ

2 K

0.1 µF

1.5 K

267

图 27. High Stability 10-V Regulator

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System Examples (接下页)

LM138QML

V_OUT

V_IN

V_OUT

V_IN

ADJ

240

R2*

Inputs

* Sets maximum V_OUT

图 28. Digitally Selected Outputs

0.1

LM138QML

V_IN

V_OUT

ADJ

2 k

LM138QML

0.05

0.1

V_IN

V_OUT

ADJ

2 k

LM307

0.1

LM138QML

V_IN

V_OUT

ADJ

R7*

120

22 µF

10 µF

2 k

* Minimum load—100 mA

图 29. 15-A Regulator

LM138QML

www.ti.com.cn

ZHCSH04 –OCTOBER 2017

System Examples (接下页)

LM138QML

V_INV_OUT

V_IN

7 V œ 35 V

V_OUT

5 V

ADJ

120

0.1 µF

360

2N2219

TTL

1 k

** Minimum output ≈ 1.2 V

图 30. 5-V Logic Regulator With Electronic Shutdown**

LM138QML

V_IN

OUT

ADJ

2 k

图 31. Light Controller

LM138QML

ZHCSH04 –OCTOBER 2017

www.ti.com.cn

System Examples (接下页)

LM138QML

V_INV_OUT

V_IN

25 V

V_OUT

ADJ

240

0.1 µF

5 k

LM113

1.2 V

680

œ10 V

Full output current not available at high input-output voltages

图 32. 0-V to 22-V Regulator

500

0.2

LM138QML

VIN > 18 V

LED

1 k

230

15 k

TO 12 V

BATTERY

2N2905

LM301A

1N457

3 k

0.1 µF

1 µF

1000 pF

START

图 33. 12-V Battery Charger

LM138QML

www.ti.com.cn

ZHCSH04 –OCTOBER 2017

System Examples (接下页)

LM138QML

0.24

I_OUT

V_IN

V_OUT

0 A œ 5 A

ADJ

150

V_IN

V_OUT

ADJ

LM117

120

Vœ

œ5 V TO œ10 V

图 34. Adjustable Current Regulator

LM138QML

V_OUT

V_REF

V_IN

I_OUT=

V_IN

ADJ

图 35. Precision Current Limiter

LM138QML

V_IN

V_OUT

V_IN

ADJ

0.24 Ω

2 W

0.1 µF

LOAD

图 36. 5-A Current Regulator

LM138QML

ZHCSH04 –OCTOBER 2017

www.ti.com.cn

System Examples (接下页)

720

240

LM138QML

ADJ

V_IN

V_OUT

V_IN

V_OUT

V_IN

ADJ

LM138QML

120

0.1 µF

1 µF

1 k

OUTPUT

ADJUST

图 37. Tracking Preregulator

LM138QML

V_OUT

V_IN

V_OUT

V_IN

V_OUT

†

V_IN

V_OUT†

ADJ

120

1N4002

1 k

† Minimum load—10 mA

* All outputs within ±100 mV

图 38. Adjusting Multiple On-Card Regulators With Single Control*

LM138QML

www.ti.com.cn

ZHCSH04 –OCTOBER 2017

System Examples (接下页)

35 V

100 k

MJ4502

R_F

C_F

10 k

75 pF

5 k

LF351

1000 µF

R_L> 4

20 pF

LM395

1 µF

100 k

INPUT

ADJ

OUT

LM138QML

0.1 µF

0.4

A_V= 1, R_F= 10k, C_F= 100 pF

A_V= 10, R_F= 100k, C_F= 10 pF

Bandwidth ≥ 100 kHz

Distortion ≤ 0.1%

图 39. Power Amplifier

LM138QML

V_OUT

R_S*

0.1

V_IN

ADJ

240

12 V

1000 µF**

2.4 k

≈

’

Z _OUT= R _{S ∆}1+

◊

* R_Ssets output impedance of charger

Use of R_Sallows low charging rates with fully charged battery.

** The 1000 μF is recommended to filter out input transients

图 40. Simple 12-V Battery Charger

LM138QML

ZHCSH04 –OCTOBER 2017

www.ti.com.cn

System Examples (接下页)

0.1

V_IN

LM138QML

0.1

LM138QML

V_IN

V_OUT

4.5 V to 25 V

ADJ

100

5 k

2N2905

LM308

150

1.5 k

5 k

200 pF

图 41. Adjustable 15-A Regulator

LM138QML

www.ti.com.cn

ZHCSH04 –OCTOBER 2017

System Examples (接下页)

LM138QML

V_IN

9 V to 30 V

V_OUT

V_IN

ADJ

240

1000 µF**

1.1 k

100

2N2222

0.2*

* Set max charge current to 3 A

** The 1000 μF is recommended to filter out input transients.

图 42. Current Limited 6-V Charger

LM138QML

ZHCSH04 –OCTOBER 2017

www.ti.com.cn

System Examples (接下页)

0.1

LM138QML

V_INV_OUT

ADJ

2 k

LM107

LM138QML

0.1

OUTPUT*

1.2 V to 20 V

V_IN

V_OUT

ADJ

120

1 µF

2 k

* Minimum load—100 mA

图 43. 10-A Regulator

LM138QML

www.ti.com.cn

ZHCSH04 –OCTOBER 2017

9 Power Supply Recommendations

The input supply to LM138QML must be kept at a voltage level such that its maximum input to output differential

voltage rating is not exceeded. The minimum dropout voltage must also be met with extra headroom when

possible to keep the LM138QML in regulation. TI recommends a capacitor be placed at the input to bypass

noise.

10 Layout

10.1 Layout Guidelines

Some layout guidelines must be followed to ensure proper regulation of the output voltage with minimum noise.

Traces carrying the load current must be wide to reduce the amount of parasitic trace inductance and the

feedback loop from V_OUTto ADJ must be kept as short as possible. To improve PSRR, a bypass capacitor can

be placed at the ADJ pin and must be placed as close as possible to the device. In cases when V_INshorts to

ground, an external diode must be placed from V_OUTto V_INto divert the surge current from the output capacitor

and protect the deice. Similarly, in cases when a large bypass capacitor is placed at the ADJ pin and V_OUTshorts

to ground, an external diode must be placed from ADJ to V_OUTto provide a path for the bypass capacitor to

discharge. These diodes must be placed close to the corresponding device pins to increase their effectiveness.

10.2 Layout Example

图 44. LM138QML Layout

LM138QML

ZHCSH04 –OCTOBER 2017

www.ti.com.cn

11 器件和文档支持

11.1 接收文档更新通知

要接收文档更新通知，请转至 TI.com 上的器件产品文件夹。单击右上角的通知我进行注册，即可每周接收产品信

息更改摘要。有关更改的详细信息，请查看任何已修订文档中包含的修订历史记录。

11.2 社区资源

下列链接提供到 TI 社区资源的连接。链接的内容由各个分销商“按照原样”提供。这些内容并不构成 TI 技术规范，

并且不一定反映 TI 的观点；请参阅 TI 的《使用条款》。

TI E2E™ 在线社区 TI 的工程师对工程师 (E2E) 社区。此社区的创建目的在于促进工程师之间的协作。在

e2e.ti.com 中，您可以咨询问题、分享知识、拓展思路并与同行工程师一道帮助解决问题。

设计支持

TI 参考设计支持可帮助您快速查找有帮助的 E2E 论坛、设计支持工具以及技术支持的联系信息。

11.3 商标

E2E is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

11.4 静电放电警告

这些装置包含有限的内置 ESD 保护。存储或装卸时，应将导线一起截短或将装置放置于导电泡棉中，以防止 MOS 门极遭受静电损

伤。

11.5 Glossary

SLYZ022 — TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.

12 机械、封装和可订购信息

以下页面包含机械、封装和可订购信息。这些信息是指定器件的最新可用数据。这些数据如有变更，恕不另行通知

和修订此文档。如欲获取此数据表的浏览器版本，请参阅左侧的导航。

PACKAGE OPTION ADDENDUM

www.ti.com

10-Dec-2020

PACKAGING INFORMATION

Orderable Device

Status Package Type Package Pins Package

Eco Plan

Lead finish/

Ball material

MSL Peak Temp

Op Temp (°C)

Device Marking

Samples

Drawing

Qty

(1)

(2)

(3)

(4/5)

(6)

LM138K-MIL

ACTIVE

Non-RoHS &

Non-Green

Call TI

LM138K-MIL

ACO

LM138KG-MD8

ACTIVE

DIESALE

100

RoHS & Green

Call TI

Level-1-NA-UNLIM

-55 to 125

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

⁽²⁾RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

⁽³⁾MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

⁽⁴⁾There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

⁽⁵⁾Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

(6)

Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two

lines if the finish value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

10-Dec-2020

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

Addendum-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com

5-Jan-2022

TRAY

Chamfer on Tray corner indicates Pin 1 orientation of packed units.

*All dimensions are nominal

Device

Package Package Pins SPQ Unit array

Max

matrix temperature

(°C)

L (mm)

Name

Type

(mm) (µm) (mm) (mm) (mm)

LM138K-MIL

TO-CAN

9 X 6

292.1 215.9 25654 3.87

22.3

25.4

Pack Materials-Page 1

MECHANICAL DATA

K0002C

K02C (Rev E)

4214774/A 03/2013

NOTES:

1. All linear dimensions are in millimeters. Dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M.

2. This drawing is subject to change without notice.

3. Leads not to be bent greater than 15º

www.ti.com

重要声明和免责声明

TI“按原样”提供技术和可靠性数据（包括数据表）、设计资源（包括参考设计）、应用或其他设计建议、网络工具、安全信息和其他资源，

不保证没有瑕疵且不做出任何明示或暗示的担保，包括但不限于对适销性、某特定用途方面的适用性或不侵犯任何第三方知识产权的暗示担

保。

这些资源可供使用 TI 产品进行设计的熟练开发人员使用。您将自行承担以下全部责任：(1) 针对您的应用选择合适的 TI 产品，(2) 设计、验

证并测试您的应用，(3) 确保您的应用满足相应标准以及任何其他功能安全、信息安全、监管或其他要求。

这些资源如有变更，恕不另行通知。TI 授权您仅可将这些资源用于研发本资源所述的 TI 产品的应用。严禁对这些资源进行其他复制或展示。

您无权使用任何其他 TI 知识产权或任何第三方知识产权。您应全额赔偿因在这些资源的使用中对 TI 及其代表造成的任何索赔、损害、成

本、损失和债务，TI 对此概不负责。

TI 提供的产品受 TI 的销售条款或 ti.com 上其他适用条款/TI 产品随附的其他适用条款的约束。TI 提供这些资源并不会扩展或以其他方式更改

TI 针对 TI 产品发布的适用的担保或担保免责声明。

TI 反对并拒绝您可能提出的任何其他或不同的条款。IMPORTANT NOTICE

邮寄地址：Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

LM138QML [TI]

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