National Semiconductor LM4051 Technical data

LM4051 Precision Micropower Shunt Voltage Reference

March 2005

General Description

Ideal for space critical applications, the LM4051 precision voltage reference is available in the sub-miniature (3 mm x

1.3 mm) SOT-23 surface-mount package. The LM4051’s advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, thus making the LM4051 easy to use. Further reducing design effort is the availability of a fixed (1.225V) and adjustable reverse breakdown voltage. The minimum operating current is 60 µA for the LM4051-1.2 and the LM4051-ADJ. Both versions have a maximum operating current of 12 mA.

The LM4051 comes in three grades (A, B, and C). The best grade devices (A) have an initial accuracy of 0.1%, while the B-grade have 0.2% and the C-grade 0.5%, all with a tempco of 50 ppm/˚C guaranteed from −40˚C to 125˚C.

The LM4051 utilizes fuse and zener-zap trim of reference voltage during wafer sort to ensure that the prime parts have an accuracy of better than

0.1% (A grade) at 25˚C.

Features

n Small packages: SOT-23 n No output capacitor required n Tolerates capacitive loads n Reverse breakdown voltage options of 1.225V and

adjustable

Key Specifications (LM4051-1.2)

Output voltage tolerance

(A grade, 25˚C)

0.1%(max)

Low output noise

(10 Hz to 10kHz) 20µV

Wide operating current range 60µA to 12mA

Industrial temperature range −40˚C to +85˚C

Extended temperature range −40˚C to +125˚C

Low temperature coefficient 50 ppm/˚C (max)

Applications

n Portable, Battery-Powered Equipment n Data Acquisition Systems n Instrumentation n Process Control n Energy Management n Automotive and Industrial n Precision Audio Components n Base Stations n Battery Chargers n Medical Equipment n Communication

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Connection Diagrams SOT-23

*This pin must be left floating or connected to pin 2.

10122201

Top View

See NS Package Number MF03A

10122240

Ordering Information

LM4051

Reverse Breakdown

Voltage Tolerance at 25˚C and Average

Reverse Breakdown

Voltage Temperature Coefficient

0.1%, 50 ppm/˚C max (A grade)

0.2%, 50 ppm/˚C max (B grade)

0.5%, 50 ppm/˚C max (C grade)

Reverse Breakdown

Voltage Tolerance at 25˚C and Average

Reverse Breakdown

Voltage Temperature Coefficient

0.1%, 50 ppm/˚C max (A grade)

0.2%, 50 ppm/˚C max (B grade)

0.5%, 50 ppm/˚C max (C grade)

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

LM4051 Supplied as 1000 Units,

Tape and Reel

LM4051AIM3-1.2 LM4051AIM3X-1.2

LM4051AIM3-ADJ LM4051AIM3X-ADJ

LM4051BIM3-1.2 LM4051BIM3X-1.2

LM4051BIM3-ADJ LM4051BIM3X-ADJ

LM4051CIM3-1.2 LM4051CIM3X-1.2

LM4051CIM3-ADJ LM4051CIM3X-ADJ

Extended Temperature Range (−40˚C to +125˚C)

LM4051 Supplied as 1000 Units,

Tape and Reel

LM4051AEM3-1.2 LM4051AEM3X-1.2

LM4051AEM3-ADJ LM4051AEM3X-ADJ

LM4051BEM3-1.2 LM4051BEM3X-1.2

LM4051BEM3-ADJ LM4051BEM3X-ADJ

LM4051CEM3-1.2 LM4051CEM3X-1.2

LM4051CEM3-ADJ LM4051CEM3X-ADJ

LM4051 Supplied as 3000 Units,

Tape and Reel

LM4051 Supplied as 3000 Units,

Tape and Reel

SOT-23 Package Marking Information

Only three fields of marking are possible on the SOT-23’s small surface. This table gives the meaning of the three fields.

Part Marking Field Definition

RHA First Field:

RIA R = Reference

RHB Second Field:

RIB H = 1.225V Voltage Option

RHC I = Adjustable

RIC Third Field:

A–C = Initial Reverse Breakdown

Voltage or Reference Voltage Tolerance

0.1%, B =±0.2%, C =±0.5%

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LM4051

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Reverse Current 20 mA

Forward Current 10 mA

Maximum Output Voltage

(LM4051-ADJ) 15V

Power Dissipation (T

= 25˚C) (Note 2)

M3 Package 280 mW

Storage Temperature −65˚C to +150˚C

Lead Temperature

M3 Packages

Vapor phase (60 seconds) +215˚C

Infrared (15 seconds) +220˚C

ESD Susceptibility

LM4051-1.2 Electrical Characteristics

Boldface limits apply for TA=TJ=T

verse Breakdown Voltage tolerances of

Symbol Parameter Conditions

RMIN

∆V

Reverse Breakdown Voltage IR= 100 µA 1.225 V

Reverse Breakdown Voltage Tolerance (Note 6)

Minimum Operating Current 39 µA

/∆T Average Reverse Breakdown

Voltage Temperature Coefficient (Note 6)

/∆IRReverse Breakdown Voltage

Change with Operating Current Change

Reverse Dynamic Impedance IR= 1 mA, f = 120 Hz 0.5 Ω

to T

MIN

0.1%,±0.2% and±0.5% respectively.

= 100 µA

Industrial Temp. Range

Extended Temp. Range

IR=10mA

=1mA

= 100 µA

∆T = −40˚C to 125˚C

≤ IR≤ 1 mA 0.3 mV

RMIN

1mA≤ I

; all other limits TA=TJ= 25˚C. The grades A, B and C designate initial Re-

MAX

≤ 12 mA 1.8 mV

Human Body Model (Note 3) 2 kV

Machine Model (Note 3) 200V

See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices.

Operating Ratings (Note 2)

Temperature Range (T

Industrial Temperature Range −40˚C ≤ T

Extended Temperature Range −40˚C ≤ T

Reverse Current

LM4051-1.2 60 µA to 12 mA

LM4051-ADJ 60 µA to 12 mA

Output Voltage Range

LM4051-ADJ 1.24V to 10V

Typical

(Note 4)

LM4051AIM3

LM4051AEM3

(Limits)

(Note 5)

1.2

5.2

7.4

60 60 60 µA (max)

65 65 65 µA (max)

20 ppm/˚C

15 ppm/˚C

1.1 1.1 1.1 mV (max)

1.5 1.5 1.5 mV (max)

6.0 6.0 6.0 mV (max)

8.0 8.0 8.0 mV (max)

LM4051BIM3

LM4051BEM3

(Limits)

(Note 5)

2.4

6.4

8.6

LM4051CIM3

LM4051CEM3

(Limts)

(Note 5)

± ±

≤ TA≤ T

min

≤ +125˚C

6 mV (max)

10.1 mV (max)

12.2 mV (max)

50 ppm/˚C (max)

max

≤ +85˚C

Units

(Limit)

)

∆V

HYST

Wideband Noise IR= 100 µA 20 µV

10 Hz ≤ f ≤ 10 kHz

Reverse Breakdown Voltage Long Term Stability (Note 9)

Thermal Hysteresis (Note 10)

t = 1000 hrs T = 25˚C±0.1˚C IR= 100 µA

∆T = −40˚C to 125˚C 0.36 mV/V

120 ppm

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LM4051-ADJ (Adjustable) Electrical Characteristics

LM4051

Boldface limits apply for TA=TJ=T

≤ IR≤ 12 mA, V

RMIN

0.2% and±0.5%, respectively for V

Symbol Parameter Conditions

RMIN

∆V

REF

OUT

REF

HYST

Reference Voltage IR= 100 µA, V

Reference Voltage Tolerance (Note 6), (Note 8)

Minimum Operating Current 36 µA

/∆IRReference Voltage Change

with Operating Current Change

/∆VOReference Voltage

Changewith Output Voltage Change

Feedback Current 70 nA

/∆T Average Reference Voltage

Temperature Coefficient (Note 8)

Dynamic Output Impedance IR= 1 mA,

Wideband Noise IR= 100 µA

Reference Voltage Long Term Stability (Note 9)

Thermal Hysteresis (Note 10)

REF

≤ V

OUT

MIN

≤ 10V. The grades A, B and C designate initial Reference Voltage Tolerances of±0.1%,

OUT

= 100 µA, V

Industrial Temp. Range

Extended Temp. Range

Industrial Temp. Range 65 65 70 µA (max)

Extended Temp. Range 70 70 75 µA (max)

RMIN

OUT

(Note 7)

1mA≤ I V

OUT

IR= 0.1 mA −1.69 mV/V

OUT

= 10mA 20 ppm/˚C

= 1mA 15 ppm/˚C

=100µA 15

∆T = −40˚C to +125˚C

f = 120 Hz, I

= 0.1 I

OUT=VREF

OUT

OUT=VREF

10 Hz ≤ f ≤ 10 kHz

t = 1000 hrs, IR= 100 µA T = 25˚C

∆T = −40˚C to +125˚C 0.3 mV/V

to T

; all other limits TJ= 25˚C unless otherwise specified (SOT-23, see (Note 7)

MAX

= 5V.

OUT

≤ IR≤ 1mA ≥ 1.6V

≤ 12 mA

≥ 1.6V(Note 7)

= 2.5V

= 10V

0.1˚C

Typical

(Note 4)

LM4051AIM3

LM4051AEM3

(Limits)

(Note 5)

LM4051BIM3

LM4051BEM3

(Limits)

(Note 5)

LM4051CIM3

LM4051CEM3

(Limits)

(Note 5)

Units

(Limit)

= 5V 1.212 V

=5V

1.2

5.2

7.4

2.4

6.4

8.6

6 mV (max)

10.1 mV (max)

12.2 mV (max)

60 60 65 µA (max)

0.3 mV

1.1 1.1 1.1 mV(max)

1.5 1.5 1.5 mV(max)

0.6 mV

6 6 6 mV (max)

888mV (max)

−2.8 −2.8 −2.8 mV/V (max)

−3.5 −3.5 −3.5 mV/V (max)

130 130 130 nA (max)

150 150 150 nA (max)

0.3

50 ppm/˚C (max)

20 µV

120 ppm

Ω Ω

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LM4051-ADJ (Adjustable) Electrical Characteristics

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

functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the 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: The maximum power dissipation must be derated at elevated temperatures and is dictated by T ambient thermal resistance), and T number given in the Absolute Maximum Ratings, whichever is lower. For the LM4051, T is 280˚C/W for the SOT-23 package.

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: Typicals are at T

Note 5: Limits are 100% production tested at 25˚C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods.

The limits are used to calculate National’s AOQL.

Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance

[(∆VR/∆T)(max ∆T)(VR)]. Where, ∆VR/∆T is the VRtemperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25 ˚C to

or T

MAX

max∆T=65˚C is shown below:

Therefore, as an example, the A-grade LM4051-1.2 has an over-temperature Reverse Breakdown Voltage tolerance of

Note 7: When V the die (-) output and the package (-) output pin. See the Output Saturation curve in the Typical Performance Characteristics section.

Note 8: Reference voltage and temperature coefficient will change with output voltage. See Typical Performance Characteristics curves.

Note 9: Long term stability is V

Note 10: Thermal hysteresis is defined as the difference in voltage measured at +25˚C after cycling to temperature -40˚C and the 25˚C measurement after cycling

to temperature +125˚C.

, and VRis the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where

MIN

A-grade:

B-grade:

C-grade:

0.425% =±0.1%±50 ppm/˚C x 65˚C

0.525% =±0.2%±50 ppm/˚C x 65˚C

0.825% =±0.5%±50 ppm/˚C x 65˚C

OUT

= 25˚C and represent most likely parametric norm.

≤ 1.6V, the LM4051-ADJ in the SOT-23 package must operate at reduced IR. This is caused by the series resistance of the die attach between

(ambient temperature). The maximum allowable power dissipation at any temperature is PD

25˚C measured during 1000 hrs.

(Continued)

(maximum junction temperature), θJA(junction to

Jmax

= 125˚C, and the typical thermal resistance (θJA), when board mounted,

Jmax

1.2V x 0.425% =±5.2 mV.

max

=(T

Jmax−TA

)/θJAor the

LM4051

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National Semiconductor LM4051 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

General Description

Features

Key Specifications (LM4051-1.2)

Applications

Ordering Information

SOT-23 Package Marking Information

Absolute Maximum Ratings (Note 1)

LM4051-1.2 Electrical Characteristics

Operating Ratings (Note 2)

LM4051-ADJ (Adjustable) Electrical Characteristics