LM4125AIM5X-2.0/NOPB [NSC]

IC,VOLT REFERENCE,FIXED,2V,BIPOLAR,TSOP,5PIN,PLASTIC;


型号：	LM4125AIM5X-2.0/NOPB
厂家：	National Semiconductor
描述：	IC,VOLT REFERENCE,FIXED,2V,BIPOLAR,TSOP,5PIN,PLASTIC 光电二极管
文件：	总13页 (文件大小：330K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

National Semiconductor is now part of

Texas Instruments.

Search http://www.ti.com/ for the latest technical

information and details on our current products and services.

November 2003

LM4125

Precision Micropower Low Dropout Voltage Reference

General Description

Features

n Small SOT23-5 package

n Low dropout voltage:

The LM4125 is a precision low power low dropout bandgap

voltage reference with up to 5 mA output current source and

sink capability.

120 mV Typ 1 mA

n High output voltage accuracy:

n Source and Sink current output:

n Supply current:

n Low Temperature Coefficient:

n Fixed output voltages:

n Industrial temperature Range:

0.2%

5 mA

This series reference operates with input voltages as low as

2V and up to 6V consuming 160 µA (Typ.) supply current. In

power down mode, device current drops to less than 2 µA.

160 µA Typ.

50 ppm/˚C

2.048, 2.5,and 4.096

−40˚C to +85˚C

The LM4125 comes in two grades (A and Standard) and

three voltage options for greater flexibility. The best grade

devices (A) have an initial accuracy of 0.2%, while the stan-

dard have an initial accuracy of 0.5%, both with a tempco of

50ppm/˚C guaranteed from −40˚C to +125˚C.

n (For extended temperature range, −40˚C to 125˚C,

contact National Semiconductor)

The very low dropout voltage, low supply current and power-

down capability of the LM4125 makes this product an ideal

choice for battery powered and portable applications.

Applications

n Portable, battery powered equipment

n Instrumentation and process control

n Automotive & Industrial

n Test equipment

The device performance is guaranteed over the industrial

temperature range (−40˚C to +85˚C), while certain specs are

guaranteed over the extended temperature range (−40˚C to

+125˚C). Please contact National for full specifications over

the extended temperature range. The LM4125 is available in

a standard 5-pin SOT-23 package.

n Data acquisition systems

n Precision regulators

n Battery chargers

n Base stations

n Communications

n Medical equipment

Connection Diagram

20069802

Refer to the Ordering Information Table in this Data Sheet for Specific Part Number

SOT23-5 Surface Mount Package

DS200698

www.national.com

Ordering Information

Industrial Temperature Range (−40˚C to + 85˚C)

LM4125 Supplied as

1000 Units, Tape and

Reel

LM4125 Supplied as

3000 Units, Tape and

Reel

Initial Output Voltage Accuracy at 25˚C

And Temperature Coefficient

Top

Marking

LM4125AIM5-2.0

LM4125AIM5-2.5

LM4125AIM5-4.1

LM4125IM5-2.0

LM4125IM5-2.5

LM4125IM5-4.1

LM4125AIM5X-2.0

LM4125AIM5X-2.5

LM4125AIM5X-4.1

LM4125IM5X-2.0

LM4125IM5X-2.5

LM4125IM5X-4.1

R80A

R81A

R82A

R80B

R81B

R82B

0.2%, 50 ppm/˚C max (A grade)

0.5%, 50 ppm/˚C max

SOT-23 Package Marking Information

Only four fields of marking are possible on the SOT-23’s small surface. This

table gives the meaning of the four fields.

Field Information

First Field:

R = Reference

Second and third Field:

80 = 2.048V Voltage Option

81 = 2.500V Voltage Option

82 = 4.096V Voltage Option

Fourth Field:

A-B = Initial Reference Voltage Tolerance

A = 0.2%

B = 0.5%

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.

Lead Temperature:

Soldering, (10 sec.)

Vapor Phase (60 sec.)

Infrared (15 sec.)

+260˚C

+215˚C

+220˚C

Maximum Voltage on input or

enable pins

−0.3V to 8V

Indefinite

Operating Range (Note 1)

Storage Temperature

Range

Output Short-Circuit Duration

Power Dissipation (T_A= 25˚C) (Note 2):

MA05B package − θ_JA

Power Dissipation

−65˚C to +150˚C

−40˚C to +85˚C

−40˚C to +125˚C

280˚C/W

350 mW

Ambient Temperature

Range

ESD Susceptibility (Note 3)

Human Body Model

Junction Temperature

Range

2 kV

Machine Model

200V

Electrical Characteristics

LM4125-2.048V and 2.5V ^{Unless otherwise specified V}_IN= 3.3V, I_LOAD= 0, C_OUT= 0.01µF, T_A= T_j= 25˚C.

Limits with standard typeface are for T_j= 25˚C, and limits in boldface type apply over the −40˚C ≤ T_A≤ +85˚C temperature

range.

Min

(Note 5)

Typ

(Note 4)

Max

(Note 5)

Symbol

Parameter

Conditions

Units

Output Voltage Initial

Accuracy

0.2

LM4125A-2.048

LM4125A-2.500

LM4125-2.048

LM4125-2.500

Temperature

V_OUT

0.5

TCV_OUT/˚C

−40˚C ≤ T_A≤ +125˚C

0.0007

0.03

ppm/˚c

Coefficient

∆V_OUT/∆V_IN

Line Regulation

3.3V ≤ V_IN≤ 6V

0.008

0.01

0.08

0.17

0.04

0.1

%/V

0 mA ≤ I_LOAD≤ 1 mA

1 mA ≤ I_LOAD≤ 5 mA

0.01

∆V_OUT/∆I_LOAD

Load Regulation

%/mA

−1 mA ≤ I_LOAD≤ 0 mA

−5 mA ≤ I_LOAD≤ −1 mA

I_LOAD= 0 mA

0.04

0.01

0.12

100

150

200

210

300

Dropout Voltage

(Note 6)

I_LOAD= +1 mA

I_LOAD= +5 mA

120

180

V_IN−V_OUT

V_N

I_S

Output Noise Voltage 0.1 Hz to 10 Hz

µV_PP

µA

(Note 8)

10 Hz to 10 kHz

Supply Current

160

257

290

V_IN= 3.3V, V_OUT= 0

V_IN= 6V, V_OUT= 0

−40˚C ≤ T_A≤ 125˚C

I_SC

Short Circuit Current

Hyst

Thermal Hysteresis

(Note 7)

0.5

mV/V

www.national.com

Electrical Characteristics

LM4125-2.048V and 2.5V ^{Unless otherwise specified V}_IN= 3.3V, I_LOAD= 0, C_OUT= 0.01µF, T_A= T_j= 25˚C.

Limits with standard typeface are for T_j= 25˚C, and limits in boldface type apply over the −40˚C ≤ T_A≤ +85˚C temperature

range. (Continued)

Min

(Note 5)

Typ

(Note 4)

100

Max

(Note 5)

Symbol

∆V_OUT

Parameter

Conditions

Units

Long Term Stability

(Note 9)

1000 hrs. 25˚C

ppm

Electrical Characteristics

LM4125-4.096V

Unless otherwise specified V_IN= 5V, I_LOAD= 0, C_OUT= 0.01µF, T_A= T_j= 25˚C. Limits with standard typeface are for T_j=

25˚C, and limits in boldface type apply over the −40˚C ≤ T_A≤ +85˚C temperature range.

Typ (Note Max (Note

Symbol

Parameter

Conditions

Min (Note 5)

Units

Output Voltage Initial

Accuracy

0.2

V_OUT

LM4125A-4.096

LM4125-4.096

Temperature

0.5

TCV_OUT/˚C

−40˚C ≤ T_A≤ +125˚C

0.0007

0.03

ppm/˚c

Coefficient

∆V_OUT/∆V_IN

Line Regulation

5V ≤ V_IN≤ 6V

0.008

0.01

0.08

0.17

0.04

0.1

%/V

0 mA ≤ I_LOAD≤ 1 mA

1 mA ≤ I_LOAD≤ 5 mA

0.01

∆V_OUT/∆I_LOAD

Load Regulation

%/mA

−1 mA ≤ I_LOAD≤ 0 mA

−5 mA ≤ I_LOAD≤ −1 mA

I_LOAD= 0 mA

0.04

0.01

0.12

100

150

200

210

300

Dropout Voltage

(Note 6)

I_LOAD= +1 mA

I_LOAD= +5 mA

120

180

V_IN−V_OUT

V_N

I_S

Output Noise Voltage 0.1 Hz to 10 Hz

µV_PP

µA

(Note 8)

10 Hz to 10 kHz

Supply Current

160

257

290

V_OUT= 0

I_SC

Short Circuit Current

V_IN= 6V, V_OUT= 0

−40˚C ≤ T_A≤ 125˚C

Hyst

Thermal Hysteresis

(Note 7)

0.5

100

mV/V

ppm

1000 hrs. 25˚C

∆V_OUT

Long Term Stability

(Note 9)

www.national.com

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 do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The

guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed

test conditions.

Note 2: Without PCB copper enhancements. The maximum power dissipation must be de-rated at elevated temperatures and is limited by T

(maximum

JMAX

junction temperature), θ (junction to ambient thermal resistance) and T (ambient temperature). The maximum power dissipation at any temperature is: PDiss

J-A

MAX

= (T

− T )/θ

up to the value listed in the Absolute Maximum Ratings.

JMAX

J-A

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin.

Note 4: Typical numbers are at 25˚C and represent the most likely parametric norm.

Note 5: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Averaging Outgoing Quality Level (AOQL).

Note 6: Dropout voltage is the differential voltage between V

and V at which V

changes ≤ 1% from V

at V = 3.3V for 2.0V, 2.5V and 5V for 4.1V. A

OUT IN

OUT

parasitic diode exists between input and output pins; it will conduct if V

is pulled to a higher voltage than V .

OUT

Note 7: Thermal hysteresis is defined as the change in +25˚C output voltage before and after exposing the device to temperature extremes.

Note 8: Output noise voltage is proportional to V . V for other voltage option is calculated using (V /1.8) * V . V (2.5V) = (36µV /1.8) * 2.5 = 46µV .

OUT

N(1.8V)

OUT

Note 9: Long term stability is change in V

at 25˚C measured continuously during 1000 hrs.

REF

www.national.com

LM4125 Typical Operating Characteristics

Unless otherwise specified, V_IN= 3.3V, V_OUT= 2.5V,

I_LOAD= 0, C_OUT= 0.022µF and T_A= 25˚C.

Long Term Drift

Typical Temperature Drift

20069812

20069813

Short Circuit Current vs Temperature

Dropout Voltage vs Output Error

20069814

20069815

Dropout Voltage vs Load Current

Load Regulation

20069833

20069818

www.national.com

LM4125 Typical Operating Characteristics Unless otherwise specified, V_IN= 3.3V, V_OUT= 2.5V,

I_LOAD= 0, C_OUT= 0.022µF and T_A= 25˚C. (Continued)

GND Pin Current at No Load

GND Pin Current

vs Temperature

20069819

20069821

GND Pin Current vs Load

0.1Hz to 10Hz output Noise

20069823

20069822

Output Impedance vs Frequency

PSRR vs Frequency

20069824

20069825

www.national.com

LM4125 Typical Operating Characteristics Unless otherwise specified, V_IN= 3.3V, V_OUT= 2.5V,

I_LOAD= 0, C_OUT= 0.022µF and T_A= 25˚C. (Continued)

Start-Up Response

Load Step Response

Thermal Hysteresis

Load Step Response

20069826

20069828

Line Step Response

20069829

20069830

20069831

www.national.com

sion references and is induced by thermal-mechanical pack-

age stress. Changes in environmental storage temperature,

operating temperature and board mounting temperature are

all factors that can contribute to thermal hysteresis.

Pin Functions

Output (Pin 5): Reference Output.

Input (Pin 4):Positive Supply.

Ground (Pin 2):Negative Supply or Ground Connection.

Application Hints

The standard application circuit for the LM4125 is shown in

Figure 1. It is designed to be stable with ceramic output

capacitors in the range of 0.022µF to 0.1µF. Note that

0.022µF is the minimum required output capacitor. These

capacitors typically have an ESR of about 0.1 to 0.5Ω.

Smaller ESR can be tolerated, however larger ESR can not.

The output capacitor can be increased to improve load tran-

sient response, up to about 1µF. However, values above

0.047µF must be tantalum. With tantalum capacitors, in the

1µF range, a small capacitor between the output and the

reference pin is required. This capacitor will typically be in

the 50pF range. Care must be taken when using output

capacitors of 1µF or larger. These application must be thor-

oughly tested over temperature, line and load.

20069832

FIGURE 1.

INPUT CAPACITOR

Noise on the power-supply input can effect the output noise,

but can be reduced by using an optional bypass capacitor

between the input pin and the ground.

An input capacitor is typically not required. However, a 0.1µF

ceramic can be used to help prevent line transients from

entering the LM4125. Larger input capacitors should be

tantalum or aluminium.

PRINTED CIRCUIT BOARD LAYOUT CONSIDERATION

The mechanical stress due to PC board mounting can cause

the output voltage to shift from its initial value. References in

SOT packages are generally less prone to assembly stress

than devices in Small Outline (SOIC) package.

The typical thermal hysteresis specification is defined as the

change in +25˚C voltage measured after thermal cycling.

The device is thermal cycled to temperature -40˚C and then

measured at 25˚C. Next the device is thermal cycled to

temperature +125˚C and again measured at 25˚C. The re-

sulting V_OUTdelta shift between the 25˚C measurements is

thermal hysteresis. Thermal hysteresis is common in preci-

To reduce the stress-related output voltage shifts, mount the

reference on the low flex areas of the PC board such as near

to the edge or the corner of the PC board.

www.national.com

Typical Application Circuits

Voltage Reference with Complimentary Output

Voltage Reference with Negative Output

20069806

Precision High Current Low Droput Regulator

20069803

Precision High Current Low Dropout Regulator

20069807

Precision Voltage Reference

with Force and Sense Output

20069804

Precision High Current

Negative Voltage Regulator

20069809

Programmable Current Source

20069805

20069810

www.national.com

Typical Application Circuits

Power Supply Splitter

(Continued)

Precision Regulator with Current Limiting Circuit

20069820

20069811

www.national.com

Physical Dimensions inches (millimeters)

unless otherwise noted

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.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products

Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification

(CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2.

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Support Center

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Support Center

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Email: ap.support@nsc.com

Email: jpn.feedback@nsc.com

Tel: 81-3-5639-7560

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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.

LM4125AIM5X-2.0/NOPB [NSC]

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