LM4030AMFX-2.5 [NSC]

Ultra-High Precision Shunt Voltage Reference; 超高精度并联型电压基准


型号：	LM4030AMFX-2.5
厂家：	National Semiconductor
描述：	Ultra-High Precision Shunt Voltage Reference 超高精度并联型电压基准
文件：	总14页 (文件大小：378K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

May 30, 2008

LM4030

SOT-23 Ultra-High Precision Shunt Voltage Reference

General Description

Features

The LM4030 is an ultra-high precision shunt voltage refer-

ence, having exceptionally high initial accuracy (0.05%) and

temperature stability (10ppm/°C). The LM4030 is available

with fixed voltage options of 2.5V and 4.096V. Despite the tiny

SOT23 package, the LM4030 exhibits excellent thermal hys-

teresis (75ppm) and long-term stability (40ppm) as well as

immunity to board stress effects.

High output voltage accuracy 0.05%

■

Low temperature coefficient 10 ppm/°C

Extended temperature operation -40-125°C

Excellent thermal hysteresis, 75ppm

Excellent long-term stability, 40ppm

High immunity to board stress effects

The LM4030 is designed to operate without an external ca-

pacitor, but any capacitor up to 10µF may be used. The

LM4030 can be powered off as little as 120µA (max) but is

capable of shunting up to 30mA continuously. As with any

shunt reference, the LM4030 can be powered off of virtually

any supply and is a simple way to generate a highly accurate

system reference.

Capable of handling 50 mA transients

Voltage options 2.5V, 4.096V

SOT23-5 Package

■

Applications

Data Acquisition/Signal path

■

The LM4030 is available in three grades (A, B, and C). The

best grade devices (A) have an initial accuracy of 0.05% with

guaranteed temperature coefficient of 10 ppm/°C or less,

while the lowest grade parts (C) have an initial accuracy of

0.15% and a temperature coefficient of 30 ppm/°C.

Test and Measurement

Automotive & Industrial

Communications

Instrumentation

Power Management

Typical Application Circuit

30046301

Connection Diagram

Top View

30046302

SOT23-5 Package

NS Package Number MF05A

300463

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Ordering Information

Input Output Voltage Accuracy at

25°C And Temperature Coefficient

LM4030 Supplied as 1000

units, Tape and Reel

LM4030 Supplied as 3000 units, Part Marking

Tape and Reel

0.05%, 10 ppm/°C max (A grade)

0.10%, 20 ppm/°C max (B grade)

0.15%, 30 ppm/°C max (C grade)

LM4030AMF-2.5

LM4030AMF-4.096

LM4030BMF-2.5

LM4030BMF-4.096

LM4030CMF-2.5

LM4030CMF-4.096

LM4030AMFX-2.5

LM4030AMFX4.096

LM4030BMFX-2.5

LM4030BMFX4.096

LM4030CMFX-2.5

LM4030CMFX4.096

R5JA

R5KA

R5JB

R5KB

R5JC

R5KC

Pin Descriptions

Pin #

Name

N/C

Function

No connect pin, leave floating

Ground or no connect

No connect pin, leave floating

Reference voltsge

GND, N/C

N/C

VREF

GND

Ground

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Infrared (15sec)

ESD Susceptibility (Note 3)

Human Body Model

220°C

2kV

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 Ratings

Maximum Continuous Shunt Current

Maximum Shunt Current (<1s)

Junction Temperature Range (T_J)

Maximum Voltage on any input

Power Dissipation (T_A= 25°C)

(Note 2)

-0.3 to 6V

30mA

50mA

−40°C to

+125°C

350mW

−65°C to 150°C

260°C

Storage Temperature Range

ꢀLead Temperature (soldering, 10sec)

Vapor Phase (60 sec)

215°C

Electrical Characteristics

LM4030-2.5 (V_OUT= 2.5V) Limits in standard type are for T_J= 25°C only, and limits in boldface type apply over

the junction temperature (T_J) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed through test, design, or

statistical correlation. Typical values represent the most likely parametric norm at T_J= 25°C, and are provided for reference

purposes only.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

(Note 4) (Note 5) (Note 4)

V_REF

Reverse Breakdown Voltage

I_SHUNT= 120µA

2.5

Reverse Breakdown Voltage Tolerance (I_SHUNT= 120µA)

LM4030A-2.5

(A Grade - 0.05%)

(B Grade - 0.10%)

(C Grade - 0.15%)

-0.05

-0.10

-0.15

0.05

0.10

0.15

120

LM4030B-2.5

LM4030C-2.5

I_RMIN

Minimum Operating Current

Temperature Coefficient (Note 6)

LM4030A-2.5

µA

ppm / °C

ppm / mA

0°C ≤ T_J≤ + 85°C

-40°C ≤ T_J≤ +125°C

160µA ≤ I_SHUNT≤ 30mA

LM4030B-2.5

LM4030C-2.5

Reverse Breakdown Voltage Change

with Current

110

ΔV_REF/ΔI_SHUNT

Long Term Stability (Note 7)

Thermal Hysteresis (Note 8)

Output Noise Voltage (Note 9)

1000 Hrs, T_A= 30°C

ppm

µV_PP

ΔV_REF

V_HYST

-40°C ≤ T_J≤ +125°C

0.1 Hz to 10 Hz

V_N

105

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Electrical Characteristics

LM4030-4.096 (V_OUT= 4.096V) Limits in standard type are for T_J= 25°C only, and limits in boldface type apply

over the junction temperature (T_J) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed through test, design,

or statistical correlation. Typical values represent the most likely parametric norm at T_J= 25°C, and are provided for reference

purposes only.

Symbol

Parameter

Conditions

Min

(Note

Typ

Max

Unit

(Note (Note 4)

V_REF

Reverse Breakdown Voltage

I_SHUNT= 130µA

4.096

Reverse Breakdown Voltage Tolerance ( I_SHUNT= 130µA)

LM4030A-4.096

(A Grade - 0.05%)

(B Grade - 0.10%)

(C Grade - 0.15%)

-0.05

-0.10

-0.15

0.05

0.10

0.15

130

LM4030B-4.096

LM4030C-4.096

I_RMIN

Minimum Operating Current

Temperature Coefficient (Note 6)

LM4030A-4.096

µA

ppm / °C

ppm / mA

0°C ≤ T_J≤ + 85°C

-40°C ≤ T_J≤ +125°C

160µA ≤ I_SHUNT≤ 30mA

LM4030B-4.096

LM4030C-4.096

Reverse Breakdown Voltage

Change with Current

ΔV_REF/ΔI_LOAD

Long Term Stability (Note 7)

Thermal Hysteresis (Note 8)

Output Noise Voltage (Note 9)

1000 Hrs, T_A= 30°C

ppm

µV_PP

ΔV_REF

V_HYST

-40°C ≤ T_J≤ +125°C

0.1 Hz to 10 Hz

V_N

165

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

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics.

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

junction temperature), θ_J-A(junction to ambient thermal resistance) and T_A(ambient temperature). The maximum power dissipation at any temperature is:

P_DissMAX= (T_JMAX- T_A) /θ_J-Aup to the value listed in the Absolute Maximum Ratings. θ_J-Afor SOT23-5 package is 220°C/W, T_JMAX= 125°C.

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

Note 4: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality

Control.

Note 5: Typical numbers are at 25°C and represent the most likely parametric norm.

Note 6: Temperature coefficient is measured by the "Box" method; i.e., the maximum ΔV_REFis divided by the maximum ΔT.

Note 7: Long term stability is V_REF@25°C measured during 1000 hrs. This measurement is taken for I_R= 500 µA.

Note 8: Thermal hysteresis is defined as the change in +25°C output voltage before and after cycling the device from (-40°C to 125°C) eight times.

Note 9: Low frequency peak-to-peak noise measured using first-order 0.1 Hz HPF and second-order 10 Hz LPF.

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Typical Performance Characteristics for 2.5V

Output Voltage vs Temperature

0.1 - 10 Hz Peak-to-Peak Noise

30046303

30046332

Start Up - 120 µA

Start Up - 50 mA

30046305

30046304

Reverse Breakdown Voltage Change with Current

Reverse Dynamic Impedance vs Frequency

30046314

30046340

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Typical Performance Characteristics for 4.096V

Output Voltage vs Temperature

0.1 - 10 Hz Peak-to-Peak Noise

30046306

30046349

Start Up - 130 µA

Start Up - 50 mA

30046308

30046307

Reverse Breakdown Voltage Change with Current

Reverse Dynamic Impedance vs Frequency

30046312

30046341

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Typical Performance Characteristics

Forward Characteristic

Load Transient Response

30046313

30046311

Minimum Operating Current

Noise Spectrum

30046316

30046317

Thermal Hysteresis Distribution

Output Voltage vs Thermal Cycle (-40°C to 125°C)

30046351

30046330

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Long Term Stability (T_A= 25°C)

Long Term Stability (T_A=125°C)

30046347

30046348

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The LM4030 is designed to operate with or without a bypass

capacitor (C_OUTin Figure 1) and is stable with capacitors of

up to 10 μF. The use of a bypass capacitor can improve tran-

sient response and reduce broadband noise. Additionally, a

bypass capacitor will counter the rising reverse dynamic

impedance at higher frequencies improving noise immunity

(see Figure 3).

Application Information

THEORY OF OPERATION

The LM4030 is an ultra-high precision shunt voltage refer-

ence, having exceptionally high initial accuracy (0.05%) and

temperature stability (10ppm/°C). The LM4030 is available

with fixed voltage options of 2.5V and 4.096V. Despite the tiny

SOT23 package, the LM4030 exhibits excellent thermal hys-

teresis (75ppm) and long-term stability (25ppm). The LM4030

is designed to operate without an external capacitor, but any

capacitor up to 10 µF may be used. The LM4030 can be pow-

ered off as little as 120 µA (max) but is capable of shunting

up to 30 mA continuously. The typical application circuit for

the LM4030 is shown in Figure 1.

30046345

FIGURE 3. Reverse Dynamic Impedance vs C_OUT

30046301

As with other regulators, an external capacitor reduces the

amplitude of the V_REFtransient when a sudden change in

loading takes place. The capacitor should be placed as close

to the part as possible to reduce the effects of unwanted board

parasitics.

FIGURE 1. Typical Application Circuit

COMPONENT SELECTION

A resistor must be chosen to set the maximum operating cur-

rent for the LM4030 (R_Zin Figure 1). The value of the resistor

can be calculated using the following equation:

THERMAL HYSTERESIS

Thermal hysteresis is the defined as the change in output

voltage at 25°C after some deviation from 25°C. This is to say

that thermal hysteresis is the difference in output voltage be-

tween two points in a given temperature profile. An illustrative

temperature profile is shown in Figure 4.

R_Z= (V_IN- V_REF)/(I_{MIN_OPERATING}+ I_{LOAD_MAX}

)

R_Zis chosen such that the total current flowing through R_Zis

greater than the maximum load current plus the minimum op-

erating current of the reference itself. This ensures that the

reference is never starved for current. Running the LM4030

at higher currents is advantageous for reducing noise. The

reverse dynamic impedance of the V_REFnode scales inverse-

ly with the shunted current (see Figure 2) leading to higher

rejection of noise emanating from the input supply and from

EMI (electro-magnetic interferrence).

30046318

FIGURE 4. Illustrative Temperature Profile

This may be expressed analytically as the following:

Where

V_HYS= Thermal hysteresis expressed in ppm

V_REF= Nominal preset output voltage

V_REF1= V_REFbefore temperature fluctuation

30046346

FIGURE 2. Reverse Dynamic Impedance vs I_OUT

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V_REF2= V_REFafter temperature fluctuation.

shifts in VREF arise due to offsets between matched devices

within the regulation loop. Both passive and active devices

naturally experience drift over time and stress and tempera-

ture gradients across the silicon die also generate offset. The

LM4030 incorporates a dynamic offset cancellation scheme

which compensates for offsets developing within the regula-

tion loop. This gives the LM4030 excellent long-term stability

(40 ppm typical) and thermal hysteresis performance (75ppm

typical), as well as substantial immunity to PCB stress effects,

despite being packaged in a tiny SOT23.

The LM4030 features a low thermal hysteresis of 75 ppm

(typical) from -40°C to 125°C after 8 temperature cycles.

TEMPERATURE COEFFICIENT

Temperature drift is defined as the maximum deviation in out-

put voltage over the temperature range. This deviation over

temperature may be illustrated as shown in Figure 5.

EXPRESSION OF ELECTRICAL CHARACTERISTICS

Electrical characteristics are typically expressed in mV, ppm,

or a percentage of the nominal value. Depending on the ap-

plication, one expression may be more useful than the other.

To convert one quantity to the other one may apply the fol-

lowing:

ppm to mV error in output voltage:

30046320

FIGURE 5. Illustrative V_REFvs Temperature Profile

Where:

V_REFis in volts (V) and V_ERRORis in milli-volts (mV).

Bit error (1 bit) to voltage error (mV):

Temperature coefficient may be expressed analytically as the

following:

V_REFis in volts (V), V_ERRORis in milli-volts (mV), and n is the

number of bits.

T_D= Temperature drift

V_REF= Nominal preset output voltage

mV to ppm error in output voltage:

V_{REF_MIN}

temperature range

V_{REF_MAX}Maximum output voltage over operating

Minimum output voltage over operating

temperature range

ΔT = Operating temperature range.

The LM4030 features a low temperature drift of 10ppm (max)

Where:

V_REFis in volts (V) and V_ERRORis in milli-volts (mV).

Voltage error (mV) to percentage error (percent):

to 30ppm (max), depending on the grade.

DYNAMIC OFFSET CANCELLATION AND LONG TERM

STABILITY

Aside from initial accuracy and drift performance, other spec-

ifications such as thermal hysteresis and long-term stability

can affect the accuracy of a voltage reference, especially over

the lifetime of the application. The reference voltage can also

shift due to board stress once the part is mounted onto the

PCB and during subsequent thermal cycles. Generally, these

Where:

V_REFis in volts (V) and V_ERRORis in milli-volts (mV).

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PRINTED CIRCUIT BOARD and LAYOUT

CONSIDERATIONS

voltage drop proportional to load current and should be min-

imized. The LM4030 should be placed as close to the load it

is driving as the layout will allow. The location of R_Zis not

important, but C_OUTshould be as close to the LM4030 as

possible so added ESR does not degrade the transient per-

formance.

The LM4030 has a very small change in reverse voltage with

current (25ppm/mA typical) so large variations in load current

(up to 50mA) should not appreciably shift VREF. Parasitic re-

sistance between the LM4030 and the load introduces a

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Physical Dimensions inches (millimeters) unless otherwise noted

SOT23-5 Package

NS Package Number MF05A

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Notes

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Notes

For more National Semiconductor product information and proven design tools, visit the following Web sites at:

Products

www.national.com/amplifiers

Design Support

Amplifiers

WEBENCH

www.national.com/webench

www.national.com/AU

Audio

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www.national.com/timing

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Analog University

App Notes

Clock Conditioners

Data Converters

Displays

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www.national.com/quality/green

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Distributors

www.national.com/displays

www.national.com/ethernet

www.national.com/interface

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Green Compliance

Packaging

Ethernet

Interface

Quality and Reliability www.national.com/quality

LVDS

Reference Designs

Feedback

www.national.com/refdesigns

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Power Management

Switching Regulators

LDOs

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www.national.com/switchers

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LED Lighting

PowerWise

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Serial Digital Interface (SDI) www.national.com/sdi

Temperature Sensors

Wireless (PLL/VCO)

www.national.com/tempsensors

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