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LM4128DMFX-2.0中文资料

November 2006 LM4128

SOT-23 Precision Micropower Series Voltage Reference

General Description

Ideal for space critical applications, the LM4128 precision voltage reference is available in the SOT-23 surface-mount package. The LM4128’s advanced design eliminates the need for an external stabilizing capacitor while ensuring sta-bility with capacitive loads up to 10 μF, thus making the LM4128 easy to use.

Series references provide lower power consumption than shunt references, since they do not have to idle the maximum possible load current under no load conditions. This advan-tage, the low quiescent current (60 μA), and the low dropout voltage (400 mV) make the LM4128 ideal for battery-powered solutions.

The LM4128 is available in four grades (A, B, C, and D) for greater flexibility. The best grade devices (A) have an initial accuracy of 0.1% with guaranteed temperature coefficient of 75 ppm/°C or less, while the lowest grade parts (D) have an initial accuracy of 1.0% and a tempco of 100 ppm/°C.Features

■Output voltage initial accuracy 0.1%

■Low temperature coefficient 75 ppm/°C

■Low Supply Current, 60 μA

■Enable pin allowing a 3 μA shutdown mode

■Up to 20 mA output current

■Voltage options 1.8V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V ■Custom voltage options available (1.8V to 4.096V)

■V IN range of V REF + 400 mV to 5.5V @10 mA

■Stable with low ESR ceramic capacitors

■SOT23-5 Package

■?40°C to 125°C junction temperature range Applications

■Instrumentation & Process Control

■Test Equipment

■Data Acquisition Systems

■Base Stations

■Servo Systems

■Portable, Battery Powered Equipment

■Automotive & Industrial

■Precision Regulators

■Battery Chargers

■Communications

■Medical Equipment

Typical Application Circuit

20211001

*Note: The capacitor C

IN is required and the capacitor C

OUT

is optional.

? 2006 National Semiconductor https://www.wendangku.net/doc/e64038497.html, LM4128 SOT-23 Precision Micropower Series Voltage Reference

Connection Diagram

Top View

20211002

SOT23-5 Package

NS Package Number MF05A

Ordering Information

Input Output Voltage Accuracy at 25°C And Temperature Coefficient LM4128 Supplied as 1000 units,Tape and Reel LM4128 Supplied as 3000 units,Tape and Reel

Part Marking

0.1%, 75 ppm/°C (A grade)

LM4128AMF-1.8LM4128AMFX-1.8R5AA LM4128AMF-2.0LM4128AMFX-2.0R5BA LM4128AMF-2.5LM4128AMFX-2.5R5CA LM4128AMF-3.0LM4128AMFX-3.0R5DA LM4128AMF-3.3LM4128AMFX-3.3R5EA LM4128AMF-4.1

LM4128AMFX-4.1R5FA 0.2%, 75 ppm/°C (B grade)

LM4128BMF-1.8LM4128BMFX-1.8R5AB LM4128BMF-2.0LM4128BMFX-2.0R5BB LM4128BMF-2.5LM4128BMFX-2.5R5CB LM4128BMF-3.0LM4128BMFX-3.0R5DB LM4128BMF-3.3LM4128BMFX-3.3R5EB LM4128BMF-4.1

LM4128BMFX-4.1R5FB 0.5%, 100 ppm/°C (C grade)

LM4128CMF-1.8LM4128CMFX-1.8R5AC LM4128CMF-2.0LM4128CMFX-2.0R5BC LM4128CMF-2.5LM4128CMFX-2.5R5CC LM4128CMF-3.0LM4128CMFX-3.0R5DC LM4128CMF-3.3LM4128CMFX-3.3R5EC LM4128CMF-4.1

LM4128CMFX-4.1R5FC 1.0%, 100 ppm/°C max (D grade)

LM4128DMF-1.8LM4128DMFX-1.8R5AD LM4128DMF-2.0LM4128DMFX-2.0R5BD LM4128DMF-2.5LM4128DMFX-2.5R5CD LM4128DMF-3.0LM4128DMFX-3.0R5DD LM4128DMF-3.3LM4128DMFX-3.3R5ED LM4128DMF-4.1

LM4128DMFX-4.1

R5FD

Pin Descriptions

Pin #Name Function

1N/C No connect pin, leave floating

2GND Ground 3EN Enable pin 4VIN Input supply 5

VREF

Reference output

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L M 4128

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.Maximum Voltage on any input -0.3 to 6V Output short circuit duration Indefinite Power Dissipation (T A = 25°C)(Note 2)

350 mW

Storage Temperature Range

?65°C to 150°C

?Lead Temperature (soldering, 10sec)260°C Vapor Phase (60 sec)

215°C

Infrared (15sec)

220°C ESD Susceptibility (Note 3)Human Body Model

2 kV

Operating Ratings

Maximum Input Supply Voltage 5.5V Maximum Enable Input Voltage V IN Maximum Load Current

20mA Junction Temperature Range (T J )

?40°C to +125°C

Electrical Characteristics LM4128-1.8 (V OUT = 1.8V)

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 unless otherwise specified.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. Unless otherwise specified V IN = 5V and I LOAD = 0A.Symbol Parameter

Conditions

Min (Note 4)Typ (Note 5)Max (Note 4)

Unit V REF

Output Voltage Initial Accuracy

LM4128A-1.8(A Grade - 0.1%)-0.1 +0.1%

LM4128B-1.8(B Grade - 0.2%)-0.2 +0.2LM4128C-1.8(C Grade - 0.5%)-0.5 +0.5LM4128D-1.8

(D Grade - 1.0%)-1.0 +1.0TCV REF / °C (Note 6)

Temperature Coefficient

LM4128A-1.8 75ppm / °C LM4128B-1.8 75LM4128C-1.8 100LM4128D-1.8

100I Q Supply Current

60100μA I Q_SD Supply Current in Shutdown EN = 0V

37μA ΔV REF /ΔV IN Line Regulation V REF + 400 mV ≤ V IN ≤ 5.5V 30 ppm / V ΔV REF /ΔI LOAD

Load Regulation

0 mA ≤ I LOAD ≤ 20 mA 25120ppm / mA ΔV REF Long Term Stability (Note 7)1000 Hrs

50 ppm Thermal Hysteresis (Note 8)-40°C ≤ T J ≤ +125°C 75 V IN - V REF

Dropout Voltage (Note 9)I LOAD = 10 mA 200400mV V N Output Noise Voltage 0.1 Hz to 10 Hz 170 μV PP I SC Short Circuit Current

75mA V IL Enable Pin Maximum Low Input Level 35%V V IH

Enable Pin Minimum High Input Level

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LM4128

Electrical Characteristics LM4128-2.0 (V OUT = 2.048V)

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 unless otherwise specified.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. Unless otherwise specified V IN = 5V and I LOA

D = 0A.Symbol Parameter

Conditions

Min (Note 4)Typ (Note 5)Max (Note 4)

Unit V REF

Output Voltage Initial Accuracy

LM4128A-2.0(A Grade - 0.1%)-0.1 +0.1%

LM4128B-2.0(B Grade - 0.2%)-0.2 +0.2LM4128C-2.0(C Grade - 0.5%)-0.5 +0.5LM4128D-2.0

(D Grade - 1.0%)-1.0 +1.0TCV REF / °C (Note 6)

Temperature Coefficient

LM4128A-2.0 75ppm / °C LM4128B-2.0 75LM4128C-2.0 100LM4128D-2.0

100I Q Supply Current

60100μA I Q_SD Supply Current in Shutdown EN = 0V

37μA ΔV REF /ΔV IN Line Regulation V REF + 400 mV ≤ V IN ≤ 5.5V 30 ppm / V ΔV REF /ΔI LOAD

Load Regulation

0 mA ≤ I LOAD ≤ 20 mA 25120ppm / mA ΔV REF Long Term Stability (Note 7)1000 Hrs

50 ppm Thermal Hysteresis (Note 8)-40°C ≤ T J ≤ +125°C 75 V IN - V REF

Dropout Voltage (Note 9)I LOAD = 10 mA 175400mV V N Output Noise Voltage 0.1 Hz to 10 Hz 190 μV PP I SC Short Circuit Current

75mA V IL Enable Pin Maximum Low Input Level 35%V V IH

Enable Pin Minimum High Input Level

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L M 4128

Electrical Characteristics LM4128-2.5 (V OUT = 2.5V)

Limits in standard type are for T J = 25°C

Conditions

Min (Note 4)Typ (Note 5)Max (Note 4)

Unit V REF

Output Voltage Initial Accuracy

LM4128A-2.5(A Grade - 0.1%)-0.1 +0.1%

LM4128B-2.5(B Grade - 0.2%)-0.2 +0.2LM4128C-2.5(C Grade - 0.5%)-0.5 +0.5LM4128D-2.5

(D Grade - 1.0%)-1.0 +1.0TCV REF / °C (Note 6)

Temperature Coefficient

LM4128A-2.5 75ppm / °C LM4128B-2.5 75LM4128C-2.5 100LM4128D-2.5

100I Q Supply Current

60100μA I Q_SD Supply Current in Shutdown EN = 0V

37μA ΔV REF /ΔV IN Line Regulation V REF + 400 mV ≤ V IN ≤ 5.5V 50 ppm / V ΔV REF /ΔI LOAD

Load Regulation

0 mA ≤ I LOAD ≤ 20 mA 25120ppm / mA ΔV REF Long Term Stability (Note 7)1000 Hrs

50 ppm Thermal Hysteresis (Note 8)-40°C ≤ T J ≤ +125°C 75 V IN - V REF

Dropout Voltage (Note 9)I LOAD = 10 mA 175400mV V N Output Noise Voltage 0.1 Hz to 10 Hz 275 μV PP I SC Short Circuit Current

75mA V IL Enable Pin Maximum Low Input Level 35%V V IH

Enable Pin Minimum High Input Level

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LM4128

Electrical Characteristics LM4128-3.0 (V OUT = 3.0V)

Limits in standard type are for T J = 25°C

Conditions

Min (Note 4)Typ (Note 5)Max (Note 4)

Unit V REF

Output Voltage Initial Accuracy

LM4128A-3.0(A Grade - 0.1%)-0.1 +0.1%

LM4128B-3.0(B Grade - 0.2%)-0.2 +0.2LM4128C-3.0(C Grade - 0.5%)-0.5 +0.5LM4128D-3.0

(D Grade - 1.0%)-1.0 +1.0TCV REF / °C (Note 6)

Temperature Coefficient

LM4128A-3.0 75ppm / °C LM4128B-3.0 75LM4128C-3.0 100LM4128D-3.0

100I Q Supply Current

60100μA I Q_SD Supply Current in Shutdown EN = 0V

37μA ΔV REF /ΔV IN Line Regulation V REF + 400 mV ≤ V IN ≤ 5.5V 70 ppm / V ΔV REF /ΔI LOAD

Load Regulation

0 mA ≤ I LOAD ≤ 20 mA 25120ppm / mA ΔV REF Long Term Stability (Note 7)1000 Hrs

50 ppm Thermal Hysteresis (Note 8)-40°C ≤ T J ≤ +125°C 75 V IN - V REF

Dropout Voltage (Note 9)I LOAD = 10 mA 175400mV V N Output Noise Voltage 0.1 Hz to 10 Hz 285 μV PP I SC Short Circuit Current

75mA V IL Enable Pin Maximum Low Input Level 35%V V IH

Enable Pin Minimum High Input Level

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L M 4128

Electrical Characteristics LM4128-3.3 (V OUT = 3.3V)

Limits in standard type are for T J = 25°C

Conditions

Min (Note 4)Typ (Note 5)Max (Note 4)

Unit V REF

Output Voltage Initial Accuracy

LM4128A-3.3(A Grade - 0.1%)-0.1 +0.1%

LM4128B-3.3(B Grade - 0.2%)-0.2 +0.2LM4128C-3.3(C Grade - 0.5%)-0.5 +0.5LM4128D-3.3

(D Grade - 1.0%)-1.0 +1.0TCV REF / °C (Note 6)

Temperature Coefficient

LM4128A-3.3 75ppm / °C LM4128B-3.3 75LM4128C-3.3 100LM4128D-3.3

100I Q Supply Current

60100μA I Q_SD Supply Current in Shutdown EN = 0V

37μA ΔV REF /ΔV IN Line Regulation V REF + 400 mV ≤ V IN ≤ 5.5V 85 ppm / V ΔV REF /ΔI LOAD

Load Regulation

0 mA ≤ I LOAD ≤ 20 mA 25120ppm / mA ΔV REF Long Term Stability (Note 7)1000 Hrs

50 ppm Thermal Hysteresis (Note 8)-40°C ≤ T J ≤ +125°C 75 V IN - V REF

Dropout Voltage (Note 9)I LOAD = 10 mA 175400mV V N Output Noise Voltage 0.1 Hz to 10 Hz 310 μV PP I SC Short Circuit Current

75mA V IL Enable Pin Maximum Low Input Level 35%V V IH

Enable Pin Minimum High Input Level

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LM4128

Electrical Characteristics LM4128-4.1 (V OUT = 4.096V)

Limits in standard type are for T J = 25°

D = 0A.Symbol Parameter

Conditions

Min (Note 4)Typ (Note 5)Max (Note 4)

Unit V REF

Output Voltage Initial Accuracy

LM4128A-4.1(A Grade - 0.1%)-0.1 +0.1%

LM4128B-4.1(B Grade - 0.2%)-0.2 +0.2LM4128C-4.1(C Grade - 0.5%)-0.5 +0.5LM4128D-4.1

(D Grade - 1.0%)-1.0 +1.0TCV REF / °C (Note 6)

Temperature Coefficient

LM4128A-4.1 75ppm / °C LM4128B-4.1 75LM4128C-4.1 100LM4128D-4.1

100I Q Supply Current

60100μA I Q_SD Supply Current in Shutdown EN = 0V

37μA ΔV REF /ΔV IN Line Regulation V REF + 400 mV ≤ V IN ≤ 5.5V 100 ppm / V ΔV REF /ΔI LOAD

Load Regulation

0 mA ≤ I LOAD ≤ 20 mA 25120ppm / mA ΔV REF Long Term Stability (Note 7)1000 Hrs

50 ppm Thermal Hysteresis (Note 8)-40°C ≤ T J ≤ +125°C 75 V IN - V REF

Dropout Voltage (Note 9)I LOAD = 10 mA 175400mV V N Output Noise Voltage 0.1 Hz to 10 Hz 350 μV PP I SC Short Circuit Current

75mA V IL Enable Pin Maximum Low Input Level 35%V V IH

Enable Pin Minimum High Input Level

%V 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), θJ-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 ) /θJ-A up to the value listed in the Absolute Maximum Ratings. θJ-A for 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 k ? 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 REF is divided by the maximum ΔT.Note 7:Long term stability is V REF @25°C measured during 1000 hrs.

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).

Note 9:Dropout voltage is defined as the minimum input to output differential at which the output voltage drops by 0.5% below the value measured with a 5V input.

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L M 4128

Typical Performance Characteristics for 2.5V

Output Voltage vs Temperature

20211054Load Regulation

20211055

Line Regulation 20211056

0.1 - 10 Hz Noise

20211021

Output Voltage Noise Spectrum 20211057

Power Supply Rejection Ratio vs Frequency

20211058

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LM4128

Dropout vs Load to 0.5% Accuracy 20211008

Typical Long Term Stability

20211030

Supply Current vs Input Voltage

20211053

Shutdown I Q vs Input Voltage

20211010

Ground Current vs Load Current

20211018

Line Transient Response

V IN = 3V to 5V

20211051

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L M 4128

Load Transient Response

LOAD

= 0 to 10mA

20211050Short-Circuit Protection and Recovery

20211082

Start-Up Response

20211083

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Application Information

THEORY OF OPERATION

The foundation of any voltage reference is the band-gap cir-cuit. While the reference in the LM4128 is developed from the gate-source voltage of transistors in the IC, principles of the band-gap circuit are easily understood using a bipolar exam-ple. For a detailed analysis of the bipolar band-gap circuit,please refer to Application Note AN-56.

SUPPLY AND ENABLE VOLTAGES

To ensure proper operation, V EN and V IN must be within a specified range. An acceptable range of input voltages is

V IN > V REF + 400 mV (I LOAD ≤ 10 mA)

The enable pin uses an internal pull-up current source (I PULL_UP ? 2 μA) that may be left floating or triggered by an external source. If the part is not enabled by an external source, it may be connected to V IN . An acceptable range of enable voltages is given by the enable transfer characteris-tics. See the E lectrical Characteristics section and E nable Transfer Characteristics figure for more detail. Note, the part will not operate correctly for V EN > V IN .

COMPONENT SELECTION

A small ceramic (X5R or X7R) capacitor on the input must be used to ensure stable operation. The value of C IN must be sized according to the output capacitor value. The value of C IN must satisfy the relationship C IN ≥ C OUT . When no output capacitor is used, C IN must have a minimum value of 0.1 μF.Noise on the power-supply input may affect the output https://www.wendangku.net/doc/e64038497.html,rger input capacitor values (typically 4.7 μF to 22 μF) may help reduce noise on the output and significantly reduce over-shoot during startup. Use of an additional optional bypass capacitor between the input and ground may help further re-duce noise on the output. With an input capacitor, the LM4128will drive any combination of resistance and capacitance up to V REF /20 mA and 10 μF respectively.

The LM4128 is designed to operate with or without an output capacitor and is stable with capacitive loads up to 10 μF.Connecting a capacitor between the output and ground will significantly improve the load transient response when switching from a light load to a heavy load. The output ca-pacitor should not be made arbitrarily large because it will effect the turn-on time as well as line and load transients.While a variety of capacitor chemistry types may be used, it is typically advisable to use low esr ceramic capacitors. Such capacitors provide a low impedance to high frequency sig-nals, effectively bypassing them to ground. Bypass capacitors should be mounted close to the part. Mounting bypass ca-pacitors close to the part will help reduce the parasitic trace components thereby improving performance.

SHORT CIRCUITED OUTPUT

The LM4128 features indefinite short circuit protection. This protection limits the output current to 75 mA when the output is shorted to ground.

TURN ON TIME

Turn on time is defined as the time taken for the output voltage to rise to 90% of the preset value. The turn on time depends on the load. The turn on time is typically 33.2 μs when driving a 1μF load and 78.8 μs when driving a 10 μF load. Some users may experience an extended turn on time (up to 10 ms) under brown out conditions and low temperatures (-40°C).

THERMAL HYSTERESIS

Thermal hysteresis is defined as the change in output voltage at 25oC after some deviation from 25oC. This is to say that thermal hysteresis is the difference in output voltage between two points in a given temperature profile. An illustrative tem-perature profile is shown in Figure 1.

20211038

FIGURE 1. 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 REF before temperature fluctuation V REF2 = V REF after temperature fluctuation.

The LM4128 features a low thermal hysteresis of 190 μV from -40°C to 125°C.

TEMPERATURE COEFFICIENT

Temperature drift is defined as the maximum deviation in out-put voltage over the operating temperature range. This devi-ation over temperature may be illustrated as shown in Figure 2.

20211039

FIGURE 2. Illustrative Temperature Coefficient Profile Temperature coefficient may be expressed analytically as the following:

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L M 4128

= Temperature drift

REF

= Nominal preset output voltage

REF_MIN

= Minimum output voltage over operating

temperature range

REF_MAX

= Maximum output voltage over operating

temperature range

ΔT = Operating temperature range.

The LM4128 features a low temperature drift of 75 ppm (max)

to 100 ppm (max), depending on the grade, from -40°C to

125°C.

LONG TERM STABILITY

Long-term stability refers to the fluctuation in output voltage

over a long period of time (1000 hours). The LM4128 features

a typical long-term stability of 50 ppm over 1000 hours. The

measurements are made using 5 units of each voltage option,

at a nominal input voltage (5V), with no load, at room tem-

perature.

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:

Where:

REF

is in volts (V) and V

ERROR

is in milli-volts (mV).

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

REF

is in volts (V), V

ERROR

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

number of bits.

mV to ppm error in output voltage:

Where:

REF

is in volts (V) and V

ERROR

is in milli-volts (mV).

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

Where:

REF

is in volts (V) and V

ERROR

is in milli-volts (mV).

PRINTED CIRCUIT BOARD and LAYOUT

CONSIDERATIONS

References in SOT packages are generally less prone to PC

board mounting than devices in Small Outline (SOIC) pack-

ages. To minimize the mechanical stress due to PC board

mounting that can cause the output voltage to shift from its

initial value, mount the reference on a low flex area of the PC

board, such as near the edge or a corner.

The part may be isolated mechanically by cutting a U shape

slot on the PCB for mounting the device. This approach also

provides some thermal isolation from the rest of the circuit.

Bypass capacitors must be mounted close to the part. Mount-

ing bypass capacitors close to the part will reduce the para-

sitic trace components thereby improving performance.

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LM4128

Typical Application Circuits

20211026

FIGURE 3. Voltage Reference with Complimentary Output

20211027

FIGURE 4. Precision Voltage Reference with Force and Sense Output

20211028

FIGURE 5. Programmable Current Source

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L M 4128

Physical Dimensions inches (millimeters) unless otherwise noted

SOT23-5 Package

NS Package Number MF05A

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Notes

L M 4128 S O T -23 P r e c i s i o n M i c r o p o w e r S e r i e s V o l t a g e R e f e r e n c e

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