Datasheet LM4132AMF-2.0, LM4132AMF-2.5, LM4132AMF-4.1, LM4132BMF-2.0, LM4132BMF-2.5 Datasheet (National) [ru]

LM4132
SOT-23 Precision Low Dropout Voltage Reference

LM4132 SOT-23 Precision Low Dropout Voltage Reference

September 2005

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 ar­chitecture that allows package level programming to over­come 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 ca­pacitor 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 maxi­mum 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 battery­powered 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

n Output initial voltage accuracy 0.05%
n Low temperature coefficient 10ppm/˚C
n Low Supply Current, 60µA
n Enable pin allowing a 3µA shutdown mode
n 20mA output current
n Voltage options 2.048V, 2.5V, 4.096V
n Custom voltage options available (1.8V to 4.096V)
n V

range of V

IN

n Stable with low ESR ceramic capacitors
n SOT23-5 Package

+ 400mV to 5.5V@10mA

REF

Applications

n Instrumentation & Process Control
n Test Equipment
n Data Acquisition Systems
n Base Stations
n Servo Systems
n Portable, Battery Powered Equipment
n Automotive & Industrial
n Precision Regulators
n Battery Chargers
n Communications
n Medical Equipment

Typical Application Circuit

*Note: The capacitor CINis required and the capacitor C

OUT

is optional.

20151301

© 2005 National Semiconductor Corporation DS201513 www.national.com

Connection Diagram

LM4132

Top View

SOT23-5 Package

NS Package Number MA05B

20151302

Ordering Information

Input Output Voltage Accuracy at

25˚C And Temperature Coefficient

0.05%, 10 ppm/˚C max (A grade) LM4132AMF-2.0 LM4132AMFX-2.0 R4BA

0.1%, 20 ppm/˚C max (B grade) LM4132BMF-2.0 LM4132BMFX-2.0 R4BB

0.2%, 20 ppm/˚C max (C grade) LM4132CMF-2.0 LM4132CMFX-2.0 R4BC

0.4%, 20 ppm/˚C max (D grade) LM4132DMF-2.0 LM4132DMFX-2.0 R4BD

0.5%, 30 ppm/˚C max (E grade) LM4132EMF-2.0 LM4132EMFX-2.0 R4BE

LM4132 Supplied as 1000

units, Tape and Reel

LM4132AMF-2.5 LM4132AMFX-2.5 R4CA

LM4132AMF-4.1 LM4132AMFX-4.1 R4FA

LM4132BMF-2.5 LM4132BMFX-2.5 R4CB

LM4132BMF-4.1 LM4132BMFX-4.1 R4FB

LM4132CMF-2.5 LM4132CMFX-2.5 R4CC

LM4132CMF-4.1 LM4132CMFX-4.1 R4FC

LM4132DMF-2.5 LM4132DMFX-2.5 R4CD

LM4132DMF-4.1 LM4132DMFX-4.1 R4FD

LM4132EMF-2.5 LM4132EMFX-2.5 R4CE

LM4132EMF-4.1 LM4132EMFX-4.1 R4FE

LM4132 Supplied as 3000 units,

Tape and Reel Part Marking

Pin Descriptions

Pin # Name Function

1 N/C No connect pin, leave floating

2 GND Ground

3 EN Enable pin

4V

5V

REF

IN

Input supply

Reference output

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LM4132

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

Lead Temperature (soldering, 10sec) 260˚C

Vapor Phase (60 sec) 215˚C

Infrared (15sec) 220˚C

ESD Susceptibility (Note 3)
Human Body Model 2kV

Output short circuit duration Indefinite

Power Dissipation (T

= 25˚C)

A

Operating Ratings

(Note 2) 350mW

Storage Temperature Range −65˚C to 150˚C

Maximum Input Supply Voltage 5.5V

Maximum Enable Input Voltage V

Maximum Load Current 20mA

Junction Temperature Range (T

Electrical Characteristics
LM4132-2.0 (V

ply over the junction temperature (T

= 2.048V) Limits in standard type are for T

OUT

) range of -40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test,

J

design, or statistical correlation. Typical values represent the most likely parametric norm at T
reference purposes only. Unless otherwise specified V

= 5V and I

IN

LOAD

=0

Symbol Parameter Conditions

V

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

(Note 6)

/˚C

Temperature Coefficient

LM4132A-2.0 0˚C ≤ T

-40˚C ≤ T

≤ + 85˚C 10

J

≤ +125˚C 20

J

LM4132B-2.0

LM4132C-2.0 20

LM4132D-2.0 20

-40˚C ≤ T

≤ +125˚C

J

LM4132E-2.0 30

∆V

∆V

REF

V

I

Q

I

Q_SD

/∆V

REF

/∆I

LOAD

∆V

REF

IN-VREF

V

N

I

SC

V

IL

Supply Current 60 100 µA

Supply Current in Shutdown EN = 0V 3 7 µA

Line Regulation V

IN

Load Regulation 0mA ≤ I

+ 400mV ≤ VIN≤ 5.5V 30 ppm / V

REF

≤ 20mA 25 120 ppm/mA

LOAD

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤ T

Dropout Voltage (Note 9) I

LOAD

≤ +125˚C 75

J

= 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

V

IH

Enable Pin Minimum High Input
Level

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

J

Min

(Note 4)

65 %V

) −40˚C to

J

= 25˚C, and are provided for

J

Typ

(Note5)Max

(Note 4) Unit

20

ppm/˚C

35 %V

IN

+125˚C

PP

IN

IN

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Electrical Characteristics
LM4132-2.5 (V

LM4132

over the junction temperature (T
sign, or statistical correlation. Typical values represent the most likely parametric norm at T
erence purposes only. Unless otherwise specified V

Symbol Parameter Conditions

V

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

(Note 6)

/˚C

Temperature Coefficient

LM4132A-2.5 0˚C ≤ T

LM4132B-2.5

LM4132C-2.5 20

LM4132D-2.5 20

LM4132E-2.5 30

∆V

∆V

REF

∆V

I

Q_SD

REF

I

Q

/∆I

REF

/∆V

LOAD

Supply Current 60 100 µA

Supply Current in Shutdown EN = 0V 3 7 µA

Line Regulation V

IN

Load Regulation 0mA ≤ I

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤ T

V

IN-VREF

V

I

SC

V

N

IL

Dropout Voltage (Note 9) I

Output Noise Voltage 0.1 Hz to 10 Hz 240 µV

Short Circuit Current 75 mA

Enable Pin Maximum Low Input
Level

V

IH

Enable Pin Minimum High Input
Level

= 2.5V) Limits in standard type are for T

OUT

) range of -40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test, de-

J

= 5V and I

IN

-40˚C ≤ T

-40˚C ≤ T

REF

LOAD

J

=0

LOAD

≤ + 85˚C 10

J

≤ +125˚C 20

J

≤ +125˚C

J

+ 400mV ≤ VIN≤ 5.5V 50 ppm / V

≤ 20mA 25 120 ppm/mA

LOAD

≤ +125˚C 75

J

= 10mA 175 400 mV

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

= 25˚C, and are provided for ref-

J

Typ

Min

(Note 4)

(Note5)Max

(Note 4) Unit

20

ppm/˚C

PP

35 %V

65 %V

IN

IN

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Electrical Characteristics
LM4132-4.1 (V

ply over the junction temperature (T

= 4.096V) Limits in standard type are for T

OUT

) range of -40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test,

J

design, or statistical correlation. Typical values represent the most likely parametric norm at T
reference purposes only. Unless otherwise specified V

= 5V and I

IN

LOAD

=0

Symbol Parameter Conditions

V

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

(Note 6)

/˚C

Temperature Coefficient

LM4132A-4.1 0˚C ≤ T

-40˚C ≤ T

≤ + 85˚C 10

J

≤ +125˚C 20

J

LM4132B-4.1

LM4132C-4.1 20

LM4132D-4.1 20

-40˚C ≤ T

≤ +125˚C

J

LM4132E-4.1 30

∆V

∆V

REF

V

I

Q

I

Q_SD

/∆V

REF

/∆I

LOAD

∆V

REF

IN-VREF

V

N

I

SC

V

IL

Supply Current 60 100 µA

Supply Current in Shutdown EN = 0V 3 7 µA

Line Regulation V

IN

Load Regulation 0mA ≤ I

+ 400mV ≤ VIN≤ 5.5V 100 ppm / V

REF

≤ 20mA 25 120 ppm/mA

LOAD

Long Term Stability (Note 7) 1000 Hrs 50 ppm

Thermal Hysteresis (Note 8) -40˚C ≤ T

Dropout Voltage (Note 9) I

LOAD

≤ +125˚C 75

J

= 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

V

IH

Enable Pin Minimum High Input
Level

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

J

Min

(Note 4)

65 %V

= 25˚C, and are provided for

J

Typ

(Note5)Max

(Note 4) Unit

20

ppm/˚C

35 %V

LM4132

PP

IN

IN

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
junction temperature), θ
=(T

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 ∆V

Note 7: Long term stability is V

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.

JMAX-TA

)/θ

(junction to ambient thermal resistance) and TA(ambient temperature). The maximum power dissipation at any temperature is: P

J-A

up to the value listed in the Absolute Maximum Ratings. θ

J-A

@

25˚C measured during 1000 hrs.

REF

for SOT23-5 package is 220˚C/W, T

J-A

is divided by the maximum ∆T.

REF

JMAX

= 125˚C.

JMAX

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(maximum

DissMAX

Typical Performance Characteristics for 2.048V

LM4132

Output Voltage vs Temperature Load Regulation

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20151304

Line Regulation 0.1 - 10 Hz Noise

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20151309

Output Voltage Noise Spectrum Power Supply Rejection Ratio vs Frequency

20151340 20151315

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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

LM4132

20151321

20151356

Output Voltage Noise Spectrum Power Supply Rejection Ratio vs Frequency

20151357 20151358

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Typical Performance Characteristics for 4.096V

LM4132

Output Voltage vs Temperature Load Regulation

20151359

20151360

Line Regulation 0.1 - 10 Hz Noise

20151319

20151361

Output Voltage Noise Spectrum Power Supply Rejection Ratio vs Frequency

20151362

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20151363

Typical Performance Characteristics

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

LM4132

20151308

Enable Threshold Voltage and Hysteresis Shutdown IQvs Temperature

20151317

Typical Long Term Stability Ground Current vs Load Current

20151353

20151310

20151330

20151318

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Typical Performance Characteristics (Continued)

LM4132

Typical Thermal Hysteresis Turn-On Transient Response

20151331

Load Transient Response

= 0 to 10mA

I

LOAD

Line Transient Response

VIN= 4V to 5.5V

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20151350

20151351

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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
specified range. An acceptable range of input voltages is

>

V

V

IN

+ 400mV (I

REF

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

) 2µA) that may be left floating or triggered by an

ULL_UP

external source. If the part is not enabled by an external
source, it may be connected to V
enable voltages is given by the enable transfer characteris­tics. 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
sized according to the output capacitor value. The value of

must satisfy the relationship CIN≥ C

C

IN

capacitor is used, C

must have a minimum value of 0.1µF.

IN

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 by­pass 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

/20mA and 10µF respectively.

REF

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 sig­nals, effectively bypassing them to ground. Bypass capaci­tors should be mounted close to the part. Mounting bypass
capacitors close to the part will help reduce the parasitic
trace components thereby improving performance.

and VINmust be within a

EN

≤ 10mA)

LOAD

. An acceptable range of

IN

>

VIN.

EN

IN

. When no output

OUT

must be

LM4132

THERMAL HYSTERESIS

Thermal hysteresis is the defined as the change in output
voltage at 25
say that thermal hysteresis is the difference in output voltage
between two points in a given temperature profile. An illus­trative temperature profile is shown in Figure 1.

-

P

This may be expressed analytically as the following:

Where
V

HYS

V

REF

V

REF1

V

REF2

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.

o

C after some deviation from 25oC. This is to

FIGURE 1. Illustrative Temperature Profile

= Thermal hysteresis expressed in ppm
= Nominal preset output voltage

=V

before temperature fluctuation

REF

=V

after temperature fluctuation.

REF

20151338

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 tempera­tures (-40˚C).

20151339

FIGURE 2. Illustrative V

vs Temperature Profile

REF

Temperature coefficient may be expressed analytically as
the following:

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Application Information (Continued)

T

LM4132

= Temperature drift

D

= Nominal preset output voltage

V

REF

V

REF_MIN

= Minimum output voltage over operating

temperature range
V

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.

Where:
V

is in volts (V) and V

REF

is in milli-volts (mV).

ERROR

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

LONG TERM STABILITY

Long-term stability refers to the fluctuation in output voltage
over a long period of time (1000 hours). The LM4132 fea­tures 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:

is in volts (V) and V

V

REF

is in milli-volts (mV).

ERROR

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

Where:
V

is in volts (V) and V

REF

is in milli-volts (mV).

ERROR

PRINTED CIRCUIT BOARD and LAYOUT CONSIDERATIONS

References in SOT packages are generally less prone to PC
board mounting than devices in Small Outline (SOIC) pack­ages. 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.

V

is in volts (V), V

REF

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

ERROR

number of bits.
mV to ppm error in output voltage:

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Typical Application Circuits

FIGURE 3. Voltage Reference with Complimentary Output

LM4132

20151326

20151327

FIGURE 4. Precision Voltage Reference with Force and Sense Output

20151328

FIGURE 5. Programmable Current Source

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Physical Dimensions inches (millimeters) unless otherwise noted

LM4132 SOT-23 Precision Low Dropout Voltage Reference

SOT23-5 Package

NS Package Number MA05B

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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LM4132 SOT-23 Precision Low Dropout Voltage Reference

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