NSC LM4051AIM3X-ADJ, LM4051AIM3-ADJ, LM4051AIM3-1.2, LM4051CIM3X-ADJ, LM4051CIM3X-1.2 Datasheet

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LM4051 Precision Micropower Shunt Voltage Reference

February 2000

General Description

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

1.3 mm) SSOT-23 surface-mount package. The LM4051’s advanced designeliminates 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: SSOT-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)

n Output voltage tolerance

(A grade, 25˚C)

n Low output noise

(10 Hz to 10kHz) 20µV

n Wide operating current range 60µA to 12mA n Industrial temperature range

(tempco guaranteed from

−40˚C to +125˚C)

n Low temperature coefficient 50 ppm/˚C (max)

0.1%(max)

rms

−40˚C to +85˚C

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

Connection Diagrams

DS101222-1

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

SSOT-23

DS101222-40

Top View

See NS Package Number MF03A

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) LM4051AIM3-1.2 LM4051AIM3X-1.2 RIA

0.2%, 50 ppm/˚C max (B grade) LM4051BIM3-1.2 LM4051BIM3X-1.2 RIB

0.5%, 50 ppm/˚C max (C grade) LM4051CIM3-1.2 LM4051CIM3X-1.2 RIC

LM4051 Supplied as

1000 Units, Tape and

Reel

LM4051AIM3-ADJ LM4051AIM3X-ADJ RHA

LM4051BIM3-ADJ LM4051BIM3X-ADJ RHB

LM4051CIM3-ADJ LM4051CIM3X-ADJ RHC

SOT-23 Package Marking Information

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

Field Definition

First Field:

R = Reference

Second Field:

I = 1.225V Voltage Option H = Adjustable

Third Field:

A–C = Initial Reverse Breakdown

Voltage or Reference Voltage Tolerance

0.1%, B =±0.2%, C =±0.5%

LM4051 Supplied as

3000 Units, Tape and

Reel

Part Marking

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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

LM4051-1.2 Electrical Characteristics

Boldface limits apply for TA=TJ=T

verse Breakdown Voltage tolerances of

Symbol Parameter Conditions

Reverse Breakdown Voltage

Tolerance (Note 6)

RMIN

Minimum Operating Current

∆V

/∆T Average Reverse

Breakdown Voltage Temperature Coefficient (Note 6)

∆V

/∆IRReverse Breakdown

Voltage Change with Operating Current Change

Reverse Dynamic Impedance

to T

MIN

0.1%,±0.2% and±0.5% respectively.

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

MAX

IR= 100 µA 1.225 V

= 100 µA

=10mA

=1mA

= 100 µA

∆T = −40˚C to 125˚C

≤ IR≤ 1 mA 0.3 mV

RMIN

1mA≤I

≤12 mA 1.8 mV

IR= 1 mA, f = 120 Hz 0.5 Ω

ESD Susceptibility

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(Notes 1, 2)

Temperature Range (T Industrial 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

(Limits)

(Note 5)

1.2

5.2

LM4051BIM3

(Limits)

(Note 5)

2.4

6.4

LM4051CIM3

Limts

(Note 5)

10.1 mV (max)

39 µA

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)

≤ TA≤ T

min

6 mV (max)

50 ppm/˚C

≤ +85˚C

Units

(Limit)

(max)

max

)

Wideband Noise IR= 100 µA 20 µV

rms

10 Hz ≤ f ≤ 10 kHz

∆V

Reverse Breakdown

Voltage Long Term Stability

t = 1000 hrs T = 25˚C I

= 100 µA

0.1˚C 120 ppm

(Note 9)

HYST

Output Hysteresis

∆T = −40˚C to 125˚C 0.36 mV/V

(Note 10)

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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

REF

≤ V

OUT

Symbol Parameter Conditions

REF

Reference Voltage IR= 100 µA, V Reference Voltage

Tolerance (Note 6), (Note 8)

RMIN

Minimum Operating Current

/∆IRReference

∆V

REF

VoltageChange with Operating Current Change

/∆VOReference Voltage

∆V

REF

Changewith Output Voltage Change

∆V

REF

Feedback Current 70

/∆T Average

ReferenceVoltage Temperature Coefficient (Note 8)

OUT

Dynamic Output Impedance

Wideband Noise IR= 100 µA

Reference Voltage

∆V

REF

Long Term Stability (Note 9)

HYST

Output Hysteresis (Note 10)

to T

MIN

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

= 5V.

OUT

= 100 µA, V

≤ IR≤ 1mA

RMIN

≥ 1.6V

OUT

(Note 7) 1mA≤I

≥ 1.6V(Note 7)

OUT

= 0.1 mA −1.69

= 2.5V

OUT

= 10mA 20 ppm/˚C

= 1mA 15 ppm/˚C

= 100µA 15

∆T = −40˚C to +125˚C IR= 1 mA,

f = 120 Hz,

= 0.1 I

OUT=VREF

= 10V

OUT

OUT=VREF

10 Hz ≤ f ≤ 10 kHz t = 1000 hrs,

= 100 µA

T = 25˚C ∆T = −40˚C to +125˚C 0.3 mV/V

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

MAX

Typical

(Note 4)

= 5V 1.212 V

OUT

=5V

OUT

LM4051AIM3

(Note 5)

1.2

5.2

LM4051BIM3

(Note 5)

2.4

6.4

LM4051CIM3

(Note 5)

10.1

0.3

≤12 mA

0.6

1.1

1.5

−2.8

−3.5

130

150

1.1

1.5

−2.8

−3.5

130

150

1.1

1.5

−2.8

−3.5

130

150

50 ppm/˚C

0.3 2

20 µV

120 ppm

0.1˚C

Units

(Limit)

mV (max) mV (max)

µA µA (max) µA (max)

mV (max)

mV(max)

mV mV (max) mV (max)

mV/V mV/V (max) mV/V (max)

nA nA (max) nA (max)

(max)

Ω Ω

rms

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Electrical Characteristics (continued)

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 bient thermal resistance), and T given in the Absolute Maximum Ratings, whichever is lower. For the LM4051, T 280˚C/W for the SSOT-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 di- rectly 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 Toleranceisdefinedastheroomtemperature 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:

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

MIN

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

= 25˚C and represent most likely parametric norm.

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

Jmax

A-grade:±0.425% =±0.1%±50 ppm/˚C x 65˚C

B-grade: C-grade:

Therefore, as an example, the A-grade LM4051-1.2 has an over-temperature Reverse Breakdown Voltage tolerance of±1.2V x 0.425% =±5.2 mV. 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 changes in 25˚C output voltage before and after cycling the device from −40˚C or +125˚C.

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

OUT

25˚C measured during 1000 hrs.

0.522% =±0.2%±50 ppm/˚C x 65˚C

0.825% =±0.5%±50 ppm/˚C x 65˚C

(maximum junction temperature), θJA(junction to am-

Jmax

max

=(T

Jmax−TA

)/θJAor the number

LM4051

Typical Performance Characteristics

Temperature Drift for Different Average Temperature Coefficient

DS101222-19

Output Impedance vs Frequency

DS101222-4

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