LM4051_技术文档

March 2005

LM4051

Precision Micropower Shunt Voltage Reference

j

General Description

Low output noise

(10 Hz to 10kHz)

20µV_rms

60µA to 12mA

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 ad-

vanced 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 adjust-

able 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.

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Wide operating current range

Industrial temperature range

Extended temperature range

Low temperature coefficient

−40˚C to +85˚C

−40˚C to +125˚C

50 ppm/˚C (max)

Applications

n Portable, Battery-Powered Equipment

n Data Acquisition Systems

n Instrumentation

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.

n Process Control

n Energy Management

n Automotive and Industrial

n Precision Audio Components

n Base Stations

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.

n Battery Chargers

n Medical Equipment

n Communication

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)

j

Output voltage tolerance

(A grade, 25˚C)

0.1%(max)

Connection Diagrams

SOT-23

10122201

10122240

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

Top View

See NS Package Number MF03A

DS101222

www.national.com

Ordering Information

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

Reverse Breakdown

Voltage Tolerance at 25˚C and Average

Reverse Breakdown

LM4051 Supplied as 1000 Units,

Tape and Reel

LM4051 Supplied as 3000 Units,

Tape and Reel

Voltage Temperature Coefficient

LM4051AIM3-1.2

LM4051AIM3-ADJ

LM4051BIM3-1.2

LM4051BIM3-ADJ

LM4051CIM3-1.2

LM4051CIM3-ADJ

LM4051AIM3X-1.2

LM4051AIM3X-ADJ

LM4051BIM3X-1.2

LM4051BIM3X-ADJ

LM4051CIM3X-1.2

LM4051CIM3X-ADJ

0.1%, 50 ppm/˚C max (A grade)

0.2%, 50 ppm/˚C max (B grade)

0.5%, 50 ppm/˚C max (C grade)

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

Reverse Breakdown

Voltage Tolerance at 25˚C and Average

Reverse Breakdown

LM4051 Supplied as 1000 Units,

Tape and Reel

LM4051 Supplied as 3000 Units,

Tape and Reel

Voltage Temperature Coefficient

LM4051AEM3-1.2

LM4051AEM3-ADJ

LM4051BEM3-1.2

LM4051BEM3-ADJ

LM4051CEM3-1.2

LM4051CEM3-ADJ

LM4051AEM3X-1.2

LM4051AEM3X-ADJ

LM4051BEM3X-1.2

LM4051BEM3X-ADJ

LM4051CEM3X-1.2

LM4051CEM3X-ADJ

0.1%, 50 ppm/˚C max (A grade)

0.2%, 50 ppm/˚C max (B grade)

0.5%, 50 ppm/˚C max (C grade)

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

RHA

Field Definition

First Field:

RIA

R = Reference

Second Field:

RHB

RIB

H = 1.225V Voltage Option

I = Adjustable

Third Field:

RHC

RIC

A–C = Initial Reverse Breakdown

Voltage or Reference Voltage Tolerance

A = 0.1%, B = 0.2%, C = 0.5%

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2

Absolute Maximum Ratings (Note 1)

Human Body Model (Note 3)

Machine Model (Note 3)

2 kV

200V

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

See AN-450 “Surface Mounting Methods and Their Effect

on Product Reliability” for other methods of soldering

surface mount devices.

Reverse Current

20 mA

10 mA

Forward Current

Maximum Output Voltage

(LM4051-ADJ)

Operating Ratings (Note 2)

15V

Temperature Range

Industrial Temperature Range

Extended Temperature Range

Reverse Current

(T_min≤ T_A≤ T_max)

Power Dissipation (T_A= 25˚C) (Note 2)

M3 Package

−40˚C ≤ T_A≤ +85˚C

−40˚C ≤ T_A≤ +125˚C

280 mW

Storage Temperature

Lead Temperature

−65˚C to +150˚C

LM4051-1.2

60 µA to 12 mA

M3 Packages

LM4051-ADJ

Vapor phase (60 seconds)

Infrared (15 seconds)

ESD Susceptibility

+215˚C

+220˚C

Output Voltage Range

LM4051-ADJ

1.24V to 10V

LM4051-1.2

Electrical Characteristics

Boldface limits apply for T_A= T_J= T_MINto T_MAX; all other limits T_A= T_J= 25˚C. The grades A, B and C designate initial Re-

verse Breakdown Voltage tolerances of 0.1%, 0.2% and 0.5% respectively.

LM4051AIM3 LM4051BIM3 LM4051CIM3

Typical LM4051AEM3 LM4051BEM3 LM4051CEM3

Units

(Limit)

Symbol

V_R

Parameter

Conditions

(Note 4)

(Limits)

(Note 5)

(Limts)

(Note 5)

Reverse Breakdown Voltage

I_R= 100 µA

1.225

V

Reverse Breakdown Voltage

Tolerance (Note 6)

I_R= 100 µA

1.2

5.2

7.4

2.4

6.4

8.6

6

mV (max)

µA

Industrial Temp. Range

Extended Temp. Range

10.1

12.2

I_RMIN

Minimum Operating Current

39

60

µA (max)

ppm/˚C

65

∆V_R/∆T

Average Reverse Breakdown

Voltage Temperature

Coefficient (Note 6)

I_R= 10 mA

I_R= 1 mA

20

15

ppm/˚C

I_R= 100 µA

∆T = −40˚C to 125˚C

50

ppm/˚C (max)

∆V_R/∆I_R

Reverse Breakdown Voltage

Change with Operating

Current Change

I_RMIN≤ I_R≤ 1 mA

0.3

mV

1.1

mV (max)

mV

1.5

1 mA ≤ I_R≤ 12 mA

I_R= 1 mA, f = 120 Hz

1.8

6.0

mV (max)

Ω

8.0

Z_R

Reverse Dynamic Impedance

Wideband Noise

0.5

20

e_N

I_R= 100 µA

µV_rms

10 Hz ≤ f ≤ 10 kHz

∆V_R

Reverse Breakdown Voltage

Long Term Stability

(Note 9)

t = 1000 hrs

T = 25˚C 0.1˚C

I_R= 100 µA

120

ppm

V_HYST

Thermal Hysteresis

(Note 10)

∆T = −40˚C to 125˚C

0.36

mV/V

3

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LM4051-ADJ (Adjustable)

Electrical Characteristics

Boldface limits apply for T_A= T_J= T_MINto T_MAX; all other limits T_J= 25˚C unless otherwise specified (SOT-23, see (Note 7)

, I_RMIN≤ I_R≤ 12 mA, V_REF≤ V_OUT≤ 10V. The grades A, B and C designate initial Reference Voltage Tolerances of 0.1%,

0.2% and 0.5%, respectively for V_OUT= 5V.

Typical LM4051AIM3 LM4051BIM3 LM4051CIM3

Units

(Limit)

(Note 4) LM4051AEM3 LM4051BEM3 LM4051CEM3

Symbol

Parameter

Conditions

(Limits)

(Note 5)

(Limits)

(Note 5)

V_REF

Reference Voltage

I_R= 100 µA, V_OUT= 5V

Industrial Temp. Range

Extended Temp. Range

1.212

36

V

Reference Voltage Tolerance

(Note 6), (Note 8)

1.2

5.2

7.4

2.4

6.4

8.6

6

mV (max)

µA

10.1

12.2

I_RMIN

Minimum Operating Current

60

65

70

60

65

70

65

70

75

µA (max)

mV

Industrial Temp. Range

Extended Temp. Range

∆V_REF/∆I_RReference Voltage Change

with Operating Current

Change

I_RMIN≤ I_R≤ 1mA

V_OUT≥ 1.6V

(Note 7)

0.3

0.6

1.1

mV(max)

mV

1.5

1 mA ≤ I_R≤ 12 mA

V_OUT≥ 1.6V(Note 7)

6

mV (max)

mV/V

8

∆V_REF/∆V_OReference Voltage

Changewith Output Voltage

Change

I_R= 0.1 mA

−1.69

70

−2.8

mV/V (max)

nA

−3.5

I_FB

Feedback Current

130

150

130

150

130

150

nA (max)

∆V_REF/∆T Average Reference Voltage

Temperature Coefficient

(Note 8)

V_OUT= 2.5V

I_R= 10mA

20

15

ppm/˚C

I_R= 1mA

I_R=100µA

50

ppm/˚C (max)

∆T = −40˚C to +125˚C

Z_OUT

Dynamic Output Impedance

I_R= 1 mA,

f = 120 Hz,

I_AC= 0.1 I_R

V_OUT= V_REF

0.3

2

Ω

V_OUT

= 10V

e_N

Wideband Noise

I_R= 100 µA

20

120

0.3

µV_rms

V_OUT= V_REF

10 Hz ≤ f ≤ 10 kHz

Reference Voltage

Long Term Stability

(Note 9)

t = 1000 hrs,

I_R= 100 µA

T = 25˚C 0.1˚C

ppm

∆V_REF

V_HYST

Thermal Hysteresis

(Note 10)

∆T = −40˚C to +125˚C

mV/V

www.national.com

4

LM4051-ADJ (Adjustable)

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

(maximum junction temperature), θ (junction to

JA

Jmax

ambient thermal resistance), and T (ambient temperature). The maximum allowable power dissipation at any temperature is PD

= (T

− T )/θ or the

A

max

Jmax A JA

number given in the Absolute Maximum Ratings, whichever is lower. For the LM4051, T

is 280˚C/W for the SOT-23 package.

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

Jmax

JA

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 = 25˚C and represent most likely parametric norm.

J

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

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

R

T

or T

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

MAX

MIN R

max∆T=65˚C is shown below:

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

B-grade: 0.525% = 0.2% 50 ppm/˚C x 65˚C

C-grade: 0.825% = 0.5% 50 ppm/˚C x 65˚C

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

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

R

OUT

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

25˚C measured during 1000 hrs.

R

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.

5

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Typical Performance Characteristics

Temperature Drift for Different

Average Temperature Coefficient

Output Impedance vs Frequency

10122219

10122204

Noise Voltage

Reverse Characteristics and

Minimum Operating Current

10122205

10122209

Start-Up

Characteristics

10122208

10122207

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6

Typical Performance Characteristics (Continued)

Reference Voltage vs Output

Voltage and Temperature

Reference Voltage vs Temperature

and Output Voltage

10122211

10122210

Feedback Current vs Output

Voltage and Temperature

Output Saturation

(SOT-23 Only)

10122212

10122233

Output Impedance vs Frequency

10122213

10122214

7

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Typical Performance Characteristics (Continued)

Reverse Characteristics

10122216

10122215

Large Signal Response

10122218

10122217

Thermal Hysteresis

10122250

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8

Functional Block Diagram

10122221

*LM4051-ADJ only

**LM4051-1.2 only

LM4051 even when the supply voltage is at its minimum and

the load current is at its maximum value. When the supply

voltage is at its maximum and I_Lis at its minimum, R_Sshould

be large enough so that the current flowing through the

LM4051 is less than 12 mA.

Applications Information

The LM4051 is a precision micro-power curvature-corrected

bandgap shunt voltage reference. For space critical applica-

tions, the LM4051 is available in the sub-miniature SOT-23

surface-mount package. The LM4051 has been designed for

stable operation without the need of an external capacitor

connected between the “+” pin and the “−” pin. If, however, a

bypass capacitor is used, the LM4051 remains stable. De-

sign effort is further reduced with the choice of either a fixed

1.2V or an adjustable reverse breakdown voltage. The mini-

mum operating current is 60 µA for the LM4051-1.2 and the

LM4051-ADJ. Both versions have a maximum operating

current of 12 mA.

R_Sshould be selected based on the supply voltage, (V_S), the

desired load and operating current, (I_Land I_Q), and the

LM4051’s reverse breakdown voltage, V_R.

The LM4051-ADJ’s output voltage can be adjusted to any

value in the range of 1.24V through 10V. It is a function of the

internal reference voltage (V_REF) and the ratio of the external

feedback resistors as shown in Figure 2 . The output voltage

is found using the equation

LM4051s using the SOT-23 package have pin 3 connected

as the (-) output through the package’s die attach interface.

Therefore, the LM4051-1.2’s pin 3 must be left floating or

connected to pin 2 and the LM4051-ADJ’s pin 3 is the (-)

output.

V_O= V_REF[(R2/R1) + 1]

(1)

The typical thermal hysteresis specification is defined as the

change in +25˚C voltage measured after thermal cycling.

The device is thermal cycled to temperature -40˚C and then

measured at 25˚C. Next the device is thermal cycled to

temperature +125˚C and again measured at 25˚C. The re-

sulting V_OUTdelta shift between the 25˚C measurements is

thermal hysteresis. Thermal hysteresis is common in preci-

sion references and is induced by thermal-mechanical pack-

age stress. Changes in environmental storage temperature,

operating temperature and board mounting temperature are

all factors that can contribute to thermal hysteresis.

(2)

where V_Ois the output voltage. The actual value of the

internal V_REFis a function of V_O. The “corrected” V_REFis

determined by

V_REF= V_O(∆V_REF/∆V_O) + V_Y

(3)

where

V_Y= 1.22V

In a conventional shunt regulator application (Figure 1), an

external series resistor (R_S) is connected between the sup-

ply voltage and the LM4051. R_Sdetermines the current that

flows through the load (I_L) and the LM4051 (I_Q). Since load

current and supply voltage may vary, R_Sshould be small

enough to supply at least the minimum acceptable I_Qto the

∆V_REF/∆V_Ois found in the Electrical Characteristics and is

typically −1.55 mV/V. You can get a more accurate indication

of the output voltage by replacing the value of V_REFin

equation (1) with the value found using equation (3).

9

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Typical Applications

10122222

FIGURE 1. Shunt Regulator

10122234

FIGURE 2. Adjustable Shunt Regulator

10122224

FIGURE 3. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage.

Nominal clamping voltage is V_O(LM4051’s reverse breakdown voltage) +2 diode V_F.

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10

Typical Applications (Continued)

10122226

10122220

FIGURE 7. Bidirectional Clamp 2.4V

FIGURE 4. Voltage Level Detector

10122223

FIGURE 5. Voltage Level Detector

10122235

FIGURE 8. Bidirectional Adjustable

Clamp 18V to 2.4V

10122225

FIGURE 6. Fast Positive Clamp

2.4V + V_D1

10122236

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11

FIGURE 9. Bidirectional Adjustable

Clamp 2.4V to 6V

Typical Applications (Continued)

10122237

FIGURE 10. Simple Floating Current Detector

10122238

FIGURE 11. Current Source

Note 11: *D1 can be any LED, V = 1.5V to 2.2V at 3 mA. D1 may act as an indicator. D1 will be on if I

falls below the threshold current, except with

THRESHOLD

F

I = O.

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12

Typical Applications (Continued)

10122239

FIGURE 12. Precision Floating Current Detector

10122229

10122228

FIGURE 13. Precision 1 µA to 1 mA Current Sources

13

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Physical Dimensions inches (millimeters) unless otherwise noted

Plastic Surface Mount Package (M3)

NS Package Number MF03A

(JEDEC Registration TO-236AB)

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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型号：	LM4051
厂家：	TEXAS INSTRUMENTS
描述：	Precision Micropower Shunt Voltage Reference
文件：	总16页 (文件大小：725K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LM4051 [TI]

相关型号：

LM4051-N

LM4051AEM3-1.2

LM4051AEM3-1.2

LM4051AEM3-1.2+T

LM4051AEM3-1.2-T

LM4051AEM3-ADJ

LM4051AEM3-ADJ

LM4051AEM3-ADJ/NOPB

LM4051AEM3X-1.2

LM4051AEM3X-1.2

LM4051AEM3X-ADJ

LM4051AEM3X-ADJ