LM4132AMF-1.8/NOPB - NATIONAL SEMICONDUCTOR

LM4132

LM4132 SOT-23 Precision Low Dropout Voltage Reference

Literature Number: SNVS372B

LM4132

SOT-23 Precision Low Dropout Voltage Reference

General Description

The LM4132 family of precision voltage references performs

comparable to the best laser-trimmed bipolar references, but

in cost effective CMOS technology. The key to this break

through is the use of EEPROM registers for correction of

curvature, tempco, and accuracy on a CMOS bandgap ar-

chitecture that allows package level programming to over-

come assembly shift. The shifts in voltage accuracy and

tempco during assembly of die into plastic packages limit the

accuracy of references trimmed with laser techniques.

Unlike other LDO references, the LM4132 is capable of

delivering up to 20mA and does not require an output ca-

pacitor or buffer amplifier. These advantages and the SOT23

packaging are important for space-critical applications.

Series references provide lower power consumption than

shunt references, since they do not have to idle the maxi-

mum possible load current under no load conditions. This

advantage, the low quiescent current (60µA), and the low

dropout voltage (400mV) make the LM4132 ideal for battery-

powered solutions.

The LM4132 is available in five grades (A, B, C, D and E) for

greater flexibility. The best grade devices (A) have an initial

accuracy of 0.05% with guaranteed temperature coefficient

of 10ppm/˚C or less, while the lowest grade parts (E) have

an initial accuracy of 0.5% and a tempco of 30ppm/˚C.

Features

nOutput initial voltage accuracy 0.05%

nLow temperature coefficient 10ppm/˚C

nLow Supply Current, 60µA

nEnable pin allowing a 3µA shutdown mode

n20mA output current

nVoltage options 1.8V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V

nCustom voltage options available (1.8V to 4.096V)

range of V

REF

+ 400mV to 5.5V @10mA

nStable with low ESR ceramic capacitors

nSOT23-5 Package

Applications

nInstrumentation & Process Control

nTest Equipment

nData Acquisition Systems

nBase Stations

nServo Systems

nPortable, Battery Powered Equipment

nAutomotive & Industrial

nPrecision Regulators

nBattery Chargers

nCommunications

nMedical Equipment

Typical Application Circuit

20151301

*Note: The capacitor CIN is required and the capacitor COUT is optional.

August 2006

LM4132 SOT-23 Precision Low Dropout Voltage Reference

Connection Diagram

Top View

20151302

SOT23-5 Package

NS Package Number MF05A

Ordering Information

Input Output Voltage Accuracy at

25˚C And Temperature Coefficient

LM4132 Supplied as 1000

units, Tape and Reel

LM4132 Supplied as 3000 units,

Tape and Reel Part Marking

0.05%, 10 ppm/˚C max (A grade) LM4132AMF-1.8 LM4132AMFX-1.8 R4AA

LM4132AMF-2.0 LM4132AMFX-2.0 R4BA

LM4132AMF-2.5 LM4132AMFX-2.5 R4CA

LM4132AMF-3.0 LM4132AMFX-3.0 R4DA

LM4132AMF-3.3 LM4132AMFX-3.3 R4EA

LM4132AMF-4.1 LM4132AMFX-4.1 R4FA

0.1%, 20 ppm/˚C max (B grade) LM4132BMF-1.8 LM4132BMFX-1.8 R4AB

LM4132BMF-2.0 LM4132BMFX-2.0 R4BB

LM4132BMF-2.5 LM4132BMFX-2.5 R4CB

LM4132BMF-3.0 LM4132BMFX-3.0 R4DB

LM4132BMF-3.3 LM4132BMFX-3.3 R4EB

LM4132BMF-4.1 LM4132BMFX-4.1 R4FB

0.2%, 20 ppm/˚C max (C grade) LM4132CMF-1.8 LM4132CMFX-1.8 R4AC

LM4132CMF-2.0 LM4132CMFX-2.0 R4BC

LM4132CMF-2.5 LM4132CMFX-2.5 R4CC

LM4132CMF-3.0 LM4132CMFX-3.0 R4DC

LM4132CMF-3.3 LM4132CMFX-3.3 R4EC

LM4132CMF-4.1 LM4132CMFX-4.1 R4FC

0.4%, 20 ppm/˚C max (D grade) LM4132DMF-1.8 LM4132DMFX-1.8 R4AD

LM4132DMF-2.0 LM4132DMFX-2.0 R4BD

LM4132DMF-2.5 LM4132DMFX-2.5 R4CD

LM4132DMF-3.0 LM4132DMFX-3.0 R4DD

LM4132DMF-3.3 LM4132DMFX-3.3 R4ED

LM4132DMF-4.1 LM4132DMFX-4.1 R4FD

0.5%, 30 ppm/˚C max (E grade) LM4132EMF-1.8 LM4132EMFX-1.8 R4AE

LM4132EMF-2.0 LM4132EMFX-2.0 R4BE

LM4132EMF-2.5 LM4132EMFX-2.5 R4CE

LM4132EMF-3.0 LM4132EMFX-3.0 R4DE

LM4132EMF-3.3 LM4132EMFX-3.3 R4EE

LM4132EMF-4.1 LM4132EMFX-4.1 R4FE

Pin Descriptions

Pin # Name Function

1 N/C No connect pin, leave floating

2 GND Ground

3 EN Enable pin

Input supply

REF

Reference output

LM4132

www.national.com 2

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

= 25˚C)

(Note 2) 350mW

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 2kV

Operating Ratings

Maximum Input Supply Voltage 5.5V

Maximum Enable Input Voltage V

Maximum Load Current 20mA

Junction Temperature Range (T

) −40˚C to

+125˚C

Electrical Characteristics

LM4132-1.8 (V

OUT

= 1.8V) Limits in standard type are for T

= 25˚C only, and limits in boldface type apply

over the junction temperature (T

) 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

25˚C, and are provided for reference purposes only. Unless otherwise specified V

= 5V and I

LOAD

Symbol Parameter Conditions

Min

(Note 4)

Typ

(Note

Max

(Note 4) Unit

REF

Output Voltage Initial Accuracy

LM4132A-1.8 (A Grade - 0.05%) -0.05 0.05 %

LM4132B-1.8 (B Grade - 0.1%) -0.1 0.1

LM4132C-1.8 (C Grade - 0.2%) -0.2 0.2

LM4132D-1.8 (D Grade - 0.4%) -0.4 0.4

LM4132E-1.8 (E Grade - 0.5%) -0.5 0.5

TCV

REF

/˚C

(Note 6)

Temperature Coefficient

LM4132A-1.8 0˚C ≤T

≤+ 85˚C 10

ppm/˚C

-40˚C ≤T

≤+125˚C 20

LM4132B-1.8

-40˚C ≤T

≤+125˚C

LM4132C-1.8 20

LM4132D-1.8 20

LM4132E-1.8 30

Supply Current 60 100 µA

Q_SD

Supply Current in Shutdown EN = 0V 3 7µA

∆V

REF

/∆V

Line Regulation V

REF

+ 400mV ≤V

≤5.5V 30 ppm / V

∆V

REF

/∆I

LOAD

Load Regulation 0mA ≤I

LOAD

≤20mA 25 120 ppm/mA

∆V

REF

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤T

≤+125˚C 75

-V

REF

Dropout Voltage (Note 9) I

LOAD

= 10mA 230 400 mV

Output Noise Voltage 0.1 Hz to 10 Hz 170 µV

Short Circuit Current 75 mA

Enable Pin Maximum Low Input

Level

35 %V

Enable Pin Minimum High Input

Level

65 %V

LM4132

www.national.com3

Electrical Characteristics

LM4132-2.0 (V

OUT

= 2.048V) Limits in standard type are for T

= 25˚C only, and limits in boldface type ap-

ply over the junction temperature (T

) 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

25˚C, and are provided for reference purposes only. Unless otherwise specified V

= 5V and I

LOAD

Symbol Parameter Conditions

Min

(Note 4)

Typ

(Note

Max

(Note 4) Unit

REF

Output Voltage Initial Accuracy

LM4132A-2.0 (A Grade - 0.05%) -0.05 0.05 %

LM4132B-2.0 (B Grade - 0.1%) -0.1 0.1

LM4132C-2.0 (C Grade - 0.2%) -0.2 0.2

LM4132D-2.0 (D Grade - 0.4%) -0.4 0.4

LM4132E-2.0 (E Grade - 0.5%) -0.5 0.5

TCV

REF

/˚C

(Note 6)

Temperature Coefficient

LM4132A-2.0 0˚C ≤T

≤+ 85˚C 10

ppm/˚C

-40˚C ≤T

≤+125˚C 20

LM4132B-2.0

-40˚C ≤T

≤+125˚C

LM4132C-2.0 20

LM4132D-2.0 20

LM4132E-2.0 30

Supply Current 60 100 µA

Q_SD

Supply Current in Shutdown EN = 0V 3 7µA

∆V

REF

/∆V

Line Regulation V

REF

+ 400mV ≤V

≤5.5V 30 ppm / V

∆V

REF

/∆I

LOAD

Load Regulation 0mA ≤I

LOAD

≤20mA 25 120 ppm/mA

∆V

REF

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤T

≤+125˚C 75

-V

REF

Dropout Voltage (Note 9) I

LOAD

= 10mA 175 400 mV

Output Noise Voltage 0.1 Hz to 10 Hz 190 µV

Short Circuit Current 75 mA

Enable Pin Maximum Low Input

Level

35 %V

Enable Pin Minimum High Input

Level

65 %V

LM4132

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Electrical Characteristics

LM4132-2.5 (V

OUT

= 2.5V) Limits in standard type are for T

= 25˚C only, and limits in boldface type apply

over the junction temperature (T

) 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

25˚C, and are provided for reference purposes only. Unless otherwise specified V

= 5V and I

LOAD

Symbol Parameter Conditions

Min

(Note 4)

Typ

(Note 5)

Max

(Note 4) Unit

REF

Output Voltage Initial Accuracy

LM4132A-2.5 (A Grade - 0.05%) -0.05 0.05 %

LM4132B-2.5 (B Grade - 0.1%) -0.1 0.1

LM4132C-2.5 (C Grade - 0.2%) -0.2 0.2

LM4132D-2.5 (D Grade - 0.4%) -0.4 0.4

LM4132E-2.5 (E Grade - 0.5%) -0.5 0.5

TCV

REF

/˚C

(Note 6)

Temperature Coefficient

LM4132A-2.5 0˚C ≤T

≤+ 85˚C 10

ppm/˚C

-40˚C ≤T

≤+125˚C 20

LM4132B-2.5

-40˚C ≤T

≤+125˚C

LM4132C-2.5 20

LM4132D-2.5 20

LM4132E-2.5 30

Supply Current 60 100 µA

Q_SD

Supply Current in Shutdown EN = 0V 3 7µA

∆V

REF

/∆V

Line Regulation V

REF

+ 400mV ≤V

≤5.5V 50 ppm / V

∆V

REF

/∆I

LOAD

Load Regulation 0mA ≤I

LOAD

≤20mA 25 120 ppm/mA

∆V

REF

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤T

≤+125˚C 75

-V

REF

Dropout Voltage (Note 9) I

LOAD

= 10mA 175 400 mV

Output Noise Voltage 0.1 Hz to 10 Hz 240 µV

Short Circuit Current 75 mA

Enable Pin Maximum Low Input

Level

35 %V

Enable Pin Minimum High Input

Level

65 %V

LM4132

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Electrical Characteristics

LM4132-3.0 (V

OUT

= 3.0V) Limits in standard type are for T

= 25˚C only, and limits in boldface type apply

over the junction temperature (T

) 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

25˚C, and are provided for reference purposes only. Unless otherwise specified V

= 5V and I

LOAD

Symbol Parameter Conditions

Min

(Note 4)

Typ

(Note 5)

Max

(Note 4) Unit

REF

Output Voltage Initial Accuracy

LM4132A-3.0 (A Grade - 0.05%) -0.05 0.05 %

LM4132B-3.0 (B Grade - 0.1%) -0.1 0.1

LM4132C-3.0 (C Grade - 0.2%) -0.2 0.2

LM4132D-3.0 (D Grade - 0.4%) -0.4 0.4

LM4132E-3.0 (E Grade - 0.5%) -0.5 0.5

TCV

REF

/˚C

(Note 6)

Temperature Coefficient

LM4132A-3.0 0˚C ≤T

≤+ 85˚C 10

ppm/˚C

-40˚C ≤T

≤+125˚C 20

LM4132B-3.0

-40˚C ≤T

≤+125˚C

LM4132C-3.0 20

LM4132D-3.0 20

LM4132E-3.0 30

Supply Current 60 100 µA

Q_SD

Supply Current in Shutdown EN = 0V 3 7µA

∆V

REF

/∆V

Line Regulation V

REF

+ 400mV ≤V

≤5.5V 70 ppm / V

∆V

REF

/∆I

LOAD

Load Regulation 0mA ≤I

LOAD

≤20mA 25 120 ppm/mA

∆V

REF

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤T

≤+125˚C 75

-V

REF

Dropout Voltage (Note 9) I

LOAD

= 10mA 175 400 mV

Output Noise Voltage 0.1 Hz to 10 Hz 285 µV

Short Circuit Current 75 mA

Enable Pin Maximum Low Input

Level

35 %V

Enable Pin Minimum High Input

Level

65 %V

LM4132

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Electrical Characteristics

LM4132-3.3 (V

OUT

= 3.3V) Limits in standard type are for T

= 25˚C only, and limits in boldface type apply

over the junction temperature (T

) 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

25˚C, and are provided for reference purposes only. Unless otherwise specified V

= 5V and I

LOAD

Symbol Parameter Conditions

Min

(Note 4)

Typ

(Note 5)

Max

(Note 4) Unit

REF

Output Voltage Initial Accuracy

LM4132A-3.3 (A Grade - 0.05%) -0.05 0.05 %

LM4132B-3.3 (B Grade - 0.1%) -0.1 0.1

LM4132C-3.3 (C Grade - 0.2%) -0.2 0.2

LM4132D-3.3 (D Grade - 0.4%) -0.4 0.4

LM4132E-3.3 (E Grade - 0.5%) -0.5 0.5

TCV

REF

/˚C

(Note 6)

Temperature Coefficient

LM4132A-3.3 0˚C ≤T

≤+ 85˚C 10

ppm/˚C

-40˚C ≤T

≤+125˚C 20

LM4132B-3.3

-40˚C ≤T

≤+125˚C

LM4132C-3.3 20

LM4132D-3.3 20

LM4132E-3.3 30

Supply Current 60 100 µA

Q_SD

Supply Current in Shutdown EN = 0V 3 7µA

∆V

REF

/∆V

Line Regulation V

REF

+ 400mV ≤V

≤5.5V 85 ppm / V

∆V

REF

/∆I

LOAD

Load Regulation 0mA ≤I

LOAD

≤20mA 25 120 ppm/mA

∆V

REF

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤T

≤+125˚C 75

-V

REF

Dropout Voltage (Note 9) I

LOAD

= 10mA 175 400 mV

Output Noise Voltage 0.1 Hz to 10 Hz 310 µV

Short Circuit Current 75 mA

Enable Pin Maximum Low Input

Level

35 %V

Enable Pin Minimum High Input

Level

65 %V

LM4132

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Electrical Characteristics

LM4132-4.1 (V

OUT

= 4.096V) Limits in standard type are for T

= 25˚C only, and limits in boldface type ap-

ply over the junction temperature (T

) 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

25˚C, and are provided for reference purposes only. Unless otherwise specified V

= 5V and I

LOAD

Symbol Parameter Conditions

Min

(Note 4)

Typ

(Note

Max

(Note 4) Unit

REF

Output Voltage Initial Accuracy

LM4132A-4.1 (A Grade - 0.05%) -0.05 0.05 %

LM4132B-4.1 (B Grade - 0.1%) -0.1 0.1

LM4132C-4.1 (C Grade - 0.2%) -0.2 0.2

LM4132D-4.1 (D Grade - 0.4%) -0.4 0.4

LM4132E-4.1 (E Grade - 0.5%) -0.5 0.5

TCV

REF

/˚C

(Note 6)

Temperature Coefficient

LM4132A-4.1 0˚C ≤T

≤+ 85˚C 10

ppm/˚C

-40˚C ≤T

≤+125˚C 20

LM4132B-4.1

-40˚C ≤T

≤+125˚C

LM4132C-4.1 20

LM4132D-4.1 20

LM4132E-4.1 30

Supply Current 60 100 µA

Q_SD

Supply Current in Shutdown EN = 0V 3 7µA

∆V

REF

/∆V

Line Regulation V

REF

+ 400mV ≤V

≤5.5V 100 ppm / V

∆V

REF

/∆I

LOAD

Load Regulation 0mA ≤I

LOAD

≤20mA 25 120 ppm/mA

∆V

REF

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤T

≤+125˚C 75

-V

REF

Dropout Voltage (Note 9) I

LOAD

= 10mA 175 400 mV

Output Noise Voltage 0.1 Hz to 10 Hz 350 µV

Short Circuit Current 75 mA

Enable Pin Maximum Low Input

Level

35 %V

Enable Pin Minimum High Input

Level

65 %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 TJMAX (maximum

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

=(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, TJMAX = 125˚C.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩresistor 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 ∆VREF is divided by the maximum ∆T.

Note 7: Long term stability is VREF @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.

LM4132

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Typical Performance Characteristics for 1.8V

Output Voltage vs Temperature Load Regulation

20151364 20151367

Line Regulation 0.1-10Hz Noise Spectrum

20151368

20151379

Output Voltage Noise Spectrum Power Supply Rejection vs Frequency

20151373 20151376

LM4132

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Typical Performance Characteristics for 2.048V

Output Voltage vs Temperature Load Regulation

20151303 20151304

Line Regulation 0.1 - 10 Hz Noise

20151309

20151314

Output Voltage Noise Spectrum Power Supply Rejection vs Frequency

20151340 20151315

LM4132

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Typical Performance Characteristics for 2.5V

Output Voltage vs Temperature Load Regulation

20151354 20151355

Line Regulation 0.1 - 10 Hz Noise

20151356

20151321

Output Voltage Noise Spectrum Power Supply Rejection vs Frequency

20151357 20151358

LM4132

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Typical Performance Characteristics for 3.0V

Output Voltage vs Temperature Load Regulation

20151365 20151369

Line Regulation 0.1-10 Hz Noise Spectrum

20151370

20151380

Output Voltage Noise Spectrum Power Supply Rejection vs Frequency

20151374 20151377

LM4132

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Typical Performance Characteristics for 3.3V

Output Voltage vs Temperature Load Regulation

20151366 20151371

Line Regulation 0.1-10 Hz Noise Spectrum

20151372

20151381

Output Voltage Noise Spectrum Power Supply Rejection vs Frequency

20151375 20151378

LM4132

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Typical Performance Characteristics for 4.096V

Output Voltage vs Temperature Load Regulation

20151359 20151360

Line Regulation 0.1 - 10 Hz Noise

20151361

20151319

Output Voltage Noise Spectrum Power Supply Rejection vs Frequency

20151362 20151363

LM4132

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Typical Performance Characteristics

Dropout vs Load to 0.5% Accuracy Supply Current vs Input Voltage

20151308 20151353

Enable Threshold Voltage and Hysteresis Shutdown I

vs Temperature

20151317

20151310

Typical Long Term Stability Ground Current vs Load Current

20151330

20151318

LM4132

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Typical Performance Characteristics (Continued)

Typical Thermal Hysteresis Turn-On Transient Response

20151331

20151352

Load Transient Response

LOAD

= 0 to 10mA

Line Transient Response

= 4V to 5.5V

20151350 20151351

LM4132

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Application Information

THEORY OF OPERATION

The foundation of any voltage reference is the band-gap

circuit. While the reference in the LM4132 is developed from

the gate-source voltage of transistors in the IC, principles of

the band-gap circuit are easily understood using a bipolar

example. 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

and V

must be within a

specified range. An acceptable range of input voltages is

REF

+ 400mV (I

LOAD

≤10mA)

The enable pin uses an internal pull-up current source (I

P-

ULL_UP

)2µA) 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

. An acceptable range of

enable voltages is given by the enable transfer characteris-

tics. See the Electrical Characteristics section and Enable

Transfer Characteristics figure for more detail. Note, the part

will not operate correctly for V

COMPONENT SELECTION

A small ceramic (X5R or X7R) capacitor on the input must be

used to ensure stable operation. The value of C

must be

sized according to the output capacitor value. The value of

must satisfy the relationship C

≥C

OUT

. When no output

capacitor is used, C

must have a minimum value of 0.1µF.

Noise on the power-supply input may affect the output noise.

Larger input capacitor values (typically 4.7µF to 22µF) may

help reduce noise on the output and significantly reduce

overshoot during startup. Use of an additional optional by-

pass capacitor between the input and ground may help

further reduce noise on the output. With an input capacitor,

the LM4132 will drive any combination of resistance and

capacitance up to V

REF

/20mA and 10µF respectively.

The LM4132 is designed to operate with or without an output

capacitor and is stable with capacitive loads up to 10µF.

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

capacitor 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 capaci-

tors should be mounted close to the part. Mounting bypass

capacitors close to the part will help reduce the parasitic

trace components thereby improving performance.

SHORT CIRCUITED OUTPUT

The LM4132 features indefinite short circuit protection. This

protection limits the output current to 75mA 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 33.2µs

when driving a 1µF load and 78.8µs when driving a 10µF

load. Some users may experience an extended turn on time

(up to 10ms) under brown out conditions and low tempera-

tures (-40˚C).

THERMAL HYSTERESIS

Thermal hysteresis is defined as the change in output volt-

age 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 illus-

trative temperature profile is shown in Figure 1.

This may be expressed analytically as the following:

Where

HYS

= Thermal hysteresis expressed in ppm

REF

= Nominal preset output voltage

REF1

REF

before temperature fluctuation

REF2

REF

after temperature fluctuation.

The LM4132 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

output voltage over the operating temperature range. This

deviation over temperature may be illustrated as shown in

Figure 2.

Temperature coefficient may be expressed analytically as

the following:

20151338

FIGURE 1. Illustrative Temperature Profile

20151339

FIGURE 2. Illustrative V

REF

vs Temperature Profile

LM4132

www.national.com17

Application Information (Continued)

= 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

∆T = Operating temperature range.

The LM4132 features a low temperature drift of 10ppm

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

LONG TERM STABILITY

Long-term stability refers to the fluctuation in output voltage

over a long period of time (1000 hours). The LM4132 fea-

tures a typical long-term stability of 50ppm 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

temperature.

EXPRESSION OF ELECTRICAL CHARACTERISTICS

Electrical characteristics are typically expressed in mV, ppm,

or a percentage of the nominal value. Depending on the

application, one expression may be more useful than the

other. To convert one quantity to the other one may apply the

following:

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.

Mounting bypass capacitors close to the part will reduce the

parasitic trace components thereby improving performance.

LM4132

www.national.com 18

Typical Application Circuits

20151326

FIGURE 3. Voltage Reference with Complimentary Output

20151327

FIGURE 4. Precision Voltage Reference with Force and Sense Output

20151328

FIGURE 5. Programmable Current Source

LM4132

www.national.com19

Physical Dimensions inches (millimeters) unless otherwise noted

SOT23-5 Package

NS Package Number MF05A

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.

For the most current product information visit us at www.national.com.

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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.

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National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances

and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at:

www.national.com/quality/green.

Lead free products are RoHS compliant.

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Support Center

Email: new.feedback@nsc.com

Tel: 1-800-272-9959

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www.national.com

LM4132 SOT-23 Precision Low Dropout Voltage Reference

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