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产品型号LM431ACM3的概述

LM431ACM3 芯片概述 LM431ACM3是一款高精度可调精度参考电压源，该芯片属于LM431系列，是由德州仪器（Texas Instruments）生产的。作为一种三端可调元件，LM431主要应用于电源管理和电压监控电路，因其优良的性能而被广泛应用于各种电子设备中。该芯片具有高精度、低温漂和宽输入电压范围等特点，适合于高要求的电源设计场合。LM431的输出电压范围从2.5V到36V，提供可调节的参考电压，以满足不同电路设计需求。此外，芯片的输出电流可以达到100mA，适合驱动较大的负载。 LM431ACM3 详细参数 LM431ACM3的详细参数包括： - 输出电压范围：2.5V至36V - 输出电流：最大100mA - 输入电压范围：2.5V到37V - 功耗：最大为1.5W - 工作温度范围：-40°C至+125°C - 精度：典型0.5%偏差 - 电源电流：典型为1.5...

产品型号LM431ACM3的Datasheet PDF文件预览

March 2002

LM431

Adjustable Precision Zener Shunt Regulator

General Description

Features

n Average temperature coefficient 50 ppm/˚C

The LM431 is a 3-terminal adjustable shunt regulator with

guaranteed temperature stability over the entire temperature

range of operation. It is now available in a chip sized pack-

age (4-Bump micro SMD) using National’s micro SMD pack-

age technology. The output voltage may be set at any level

greater than 2.5V (V_REF) up to 36V merely by selecting two

external resistors that act as a voltage divided network. Due

to the sharp turn-on characteristics this device is an excel-

lent replacement for many zener diode applications.

n Temperature compensated for operation over the full

temperature range

n Programmable output voltage

n Fast turn-on response

n Low output noise

n LM431 in micro SMD package

n See AN-1112 for micro SMD considerations

Connection Diagrams

TO-92: Plastic Package

SOT-23: 3-Lead Small Outline

DS010055-28

DS010055-1

Top View

4-Bump micro SMD

SO-8: 8-Pin Surface Mount

DS010055-54

DS010055-2

Top View

(bump side down)

Top view

Note: NC = Not internally connected. Must be electrically isolated from the

rest of the circuit for the microSMD package.

DS010055

www.national.com

Ordering Information

Package

Typical Accuracy Order Number/Package Marking

Temperature

Range

Transport Media

NSC

Drawing

0.5%

LM431ACZ/

LM431ACZ

TO-92

LM431CCZ/

LM431CCZ

LM431BCZ/

LM431BCZ

0˚C to +70˚C

−40˚C to +85˚C

0˚C to +70˚C

Rails

Z03A

M08A

LM431CIZ/

LM431CIZ

LM431BIZ/

LM431BIZ

LM431AIZ/

LM431AIZ

SO-8

LM431CCM/

431CCM

LM431BCM/

431BCM

LM431ACM/

LM431ACM

Rails and Tape &Reel

LM431CIM/

431CIM

LM431BIM/

431BIM

LM431AIM/

LM431AIM

−40˚C to +85˚C

0˚C to +70˚C

SOT-23

LM431CCM3/ LM431BCM3/ LM431ACM3/

N1B

N1D

N1F

MF03A

LM431CIM3

N1A

LM431BIM3

N1C

LM431AIM3

N1E

−40˚C to +85˚C

micro SMD

LM431AIBP

LM431AIBPX(Note 1)

250 Units Tape and Reel

3k Units Tape and Reel

–

BPA04AFB

Note 1: The micro SMD package marking is a 1 digit manufacturing Date Code only

micro SMD Top View Marking Example

DS010055-56

www.national.com

Symbol and Functional Diagrams

DS010055-99

DS010055-55

DC Test Circuits

DS010055-4

DS010055-5

Note:

= V

(1 + R1/R2) + I_REF• R1

REF

FIGURE 1. Test Circuit for V_Z= V_REF

FIGURE 2. Test Circuit for V_ZV_REF

DS010055-6

FIGURE 3. Test Circuit for Off-State Current

www.national.com

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Reference Voltage

−0.5V

Reference Input Current

10 mA

Internal Power Dissipation (Notes 3, 4)

TO-92 Package

SO-8 Package

SOT-23 Package

0.78W

0.81W

0.28W

Storage Temperature Range

Operating Temperature Range

Industrial (LM431xI)

−65˚C to +150˚C

micro SMD Package

0.30W

−40˚C to +85˚C

0˚C to +70˚C

Commercial (LM431xC)

Soldering Information

Operating Conditions

Min

Max

Infrared or Convection (20 sec.)

Wave Soldering (10 sec.)

Cathode Voltage

235˚C

260˚C (lead temp.)

37V

Cathode Voltage

Cathode Current

V_REF

37V

1.0 mA

100 mA

Continuous Cathode Current

−10 mA to +150 mA

LM431

Electrical Characteristics

T_A= 25˚C unless otherwise specified

Symbol

Parameter

Reference Voltage

Conditions

Min

Typ

Max

Units

V_REF

V_Z= V_REF, I_I= 10 mA

2.440

2.495

2.550

2.520

2.510

LM431A (Figure 1 )

V_Z= V_REF, I_I= 10 mA

LM431B (Figure 1 )

2.470

2.485

2.495

2.500

8.0

V_Z= V_REF, I_I= 10 mA

LM431C (Figure 1 )

V_DEV

Deviation of Reference Input Voltage Over

Temperature (Note 5)

V_Z= V_REF, I_I= 10 mA,

T_A= Full Range (Figure 1 )

I_Z= 10 mA V_Zfrom V_REFto 10V

Ratio of the Change in Reference Voltage

−1.4

−1.0

2.0

−2.7

−2.0

4.0

mV/V

µA

to the Change in Cathode Voltage

Reference Input Current

(Figure 2 )

V_Zfrom 10V to 36V

∞

I_REF

R₁= 10 kΩ, R₂

I_I= 10 mA (Figure 2 )

∞

I_REF

Deviation of Reference Input Current over

Temperature

R₁= 10 kΩ, R₂

I_I= 10 mA,

0.4

1.2

µA

T_A= Full Range (Figure 2 )

V_Z= V_REF(Figure 1 )

I_Z(MIN)

I_Z(OFF)

r_Z

Minimum Cathode Current for Regulation

Off-State Current

0.4

0.3

1.0

µA

Ω

V_Z= 36V, V_REF= 0V (Figure 3 )

V_Z= V_REF, LM431A,

Dynamic Output Impedance (Note 6)

0.75

Frequency = 0 Hz (Figure 1 )

V_Z= V_REF, LM431B, LM431C

Frequency = 0 Hz (Figure 1 )

0.50

Ω

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device

beyond its rated operating conditions.

Note 3: T

= 150˚C.

J Max

Note 4: Ratings apply to ambient temperature at 25˚C. Above this temperature, derate the TO-92 at 6.2 mW/˚C, the SO-8 at 6.5 mW/˚C, the SOT-23 at 2.2 mW/˚C

and the micro SMD at 3mW/˚C.

Note 5: Deviation of reference input voltage, V

, is defined as the maximum variation of the reference input voltage over the full temperature range.

DEV

www.national.com

LM431

Electrical Characteristics ^(Continued)

DS010055-7

The average temperature coefficient of the reference input voltage,

, is defined as:

REF

Where:

− T = full temperature change (0-70˚C).

can be positive or negative depending on whether the slope is positive or negative.

REF

Example: V

= 8.0 mV, V

= 2495 mV, T − T = 70˚C, slope is positive.

DEV

REF 2 1

Note 6: The dynamic output impedance, r , is defined as:

When the device is programmed with two external resistors, R1 and R2, (see Figure 2 ), the dynamic output impedance of the overall circuit, r , is defined as:

Equivalent Circuit

DS010055-3

www.national.com

Typical Performance Characteristics

Input Current vs V_Z

Thermal Information

Input Current vs V_Z

DS010055-29

DS010055-31

DS010055-30

Dynamic Impedance vs Frequency

DS010055-10

DS010055-9

Stability Boundary Conditions

DS010055-11

Note: The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V were adjusted to establish

the initial V and I conditions with C = 0. V and C were then adjusted to determine the ranges of stability.

Test Circuit for Curve A Above

Test Circuit for Curves B, C and D Above

DS010055-12

DS010055-13

www.national.com

Typical Applications

Shunt Regulator

Single Supply Comparator with

Temperature Compensated Threshold

DS010055-14

DS010055-15

Series Regulator

Output Control of a Three

Terminal Fixed Regulator

DS010055-16

DS010055-17

Higher Current Shunt Regulator

Crow Bar

DS010055-18

DS010055-19

www.national.com

Typical Applications (Continued)

Over Voltage/Under Voltage

Protection Circuit

DS010055-20

Voltage Monitor

DS010055-21

www.national.com

Typical Applications (Continued)

Delay Timer

Current Limiter or Current Source

DS010055-23

DS010055-22

Constant Current Sink

DS010055-24

2.0 LM431 micro SMD Light Sensitivity

Application Info

When the LM431 micro SMD package is exposed to bright

sunlight, normal office fluorescent light, and other LED’s and

lasers, it operates within the guaranteed limits specified in

the electrical characteristics table.

1.0 Mounting

To ensure that the geometry of the micro SMD package

maintains good physical contact with the printed circuit

board, pin A1 (NC) must be soldered to the pcb. Please see

AN-1112 for more detailed information regarding board

mounting techniques for the micro SMD package.

www.national.com

Physical Dimensions inches (millimeters) unless otherwise noted

NS Package Number M08A

SOT-23 Molded Small Outline Transistor Package (M3)

NS Package Number MF03A

www.national.com

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

NS Package Number Z03A

www.national.com

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

NOTES: UNLESS OTHERWISE SPECIFIED

1. EPOXY COATING

2. 63Sn/37Pb EUTECTIC BUMP

3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.

4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE

NUMBERED.

5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS

PACKAGE LENGTH AND X3 IS PACKAGE HEIGHT.

6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BA.

4-Bump micro SMD

X1 = 0.777 X2 = 0.904 X3 = 0.850

NS Package Number BPA04AFB

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

Europe

National Semiconductor

Asia Pacific Customer

Response Group

Tel: 65-2544466

Fax: 65-2504466

National Semiconductor

Japan Ltd.

Tel: 81-3-5639-7560

Fax: 81-3-5639-7507

Fax: +49 (0) 180-530 85 86

Email: support@nsc.com

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

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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LM431ACM3产品参数

型号:	LM431ACM3
是否无铅：	含铅
是否Rohs认证：	不符合
生命周期：	Obsolete
IHS 制造商：	TEXAS INSTRUMENTS INC
零件包装代码：	SOT-23
包装说明：	PLASTIC, SOT-23, 3 PIN
针数：	3
Reach Compliance Code：	not_compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
Factory Lead Time：	1 week
风险等级：	7.56
Is Samacsys：	N
其他特性：	OUTPUT VOLTAGE ADJUSTABLE FROM 2.495 TO 36V WITH TWO EXTERNAL RESISTORS
模拟集成电路 - 其他类型：	TWO TERMINAL VOLTAGE REFERENCE
JESD-30 代码：	R-PDSO-G3
JESD-609代码：	e0
长度：	2.92 mm
湿度敏感等级：	1
功能数量：	1
输出次数：	1
端子数量：	3
最高工作温度：	70 °C
最低工作温度：
最大输出电流：	0.1 A
最大输出电压：	2.55 V
最小输出电压：	2.44 V
标称输出电压：	2.495 V
封装主体材料：	PLASTIC/EPOXY
封装代码：	TSOP
封装等效代码：	TO-236
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE
峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified
座面最大高度：	1.12 mm
子类别：	Voltage References
表面贴装：	YES
技术：	BIPOLAR
最大电压温度系数：	97.338 ppm/ °C
温度等级：	COMMERCIAL
端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING
端子节距：	0.95 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED
微调/可调输出：	YES
宽度：	1.3 mm
Base Number Matches：	1

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