LM4120_05 [NSC]

Precision Micropower Low Dropout Voltage Reference; 精密微功耗低压差电压基准


型号：	LM4120_05
厂家：	National Semiconductor
描述：	Precision Micropower Low Dropout Voltage Reference 精密微功耗低压差电压基准
文件：	总12页 (文件大小：721K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

March 2005

LM4120

Precision Micropower Low Dropout Voltage Reference

General Description

Features

n Small SOT23-5 package

n Low dropout voltage:

n High output voltage accuracy:

n Source and Sink current output:

n Supply current:

The LM4120 is a precision low power low dropout bandgap

voltage reference with up to 5 mA output current source and

sink capability.

120 mV Typ 1 mA

0.2%

5 mA

This series reference operates with input voltages as low as

2V and up to 12V consuming 160 µA (Typ.) supply current. In

power down mode, device current drops to less than 2 µA.

160 µA Typ.

50 ppm/˚C

n Low Temperature Coefficient:

n Enable pin

n Fixed output voltages:

and 5.0V

n Industrial temperature Range:

The LM4120 comes in two grades (A and Standard) and

seven voltage options for greater flexibility. The best grade

devices (A) have an initial accuracy of 0.2%, while the stan-

dard have an initial accuracy of 0.5%, both with a tempco of

50ppm/˚C guaranteed from −40˚C to +125˚C.

1.8, 2.048, 2.5, 3.0, 3.3, 4.096

−40˚C to +85˚C

n (For extended temperature range, −40˚C to 125˚C,

contact National Semiconductor)

The very low dropout voltage, low supply current and power-

down capability of the LM4120 makes this product an ideal

choice for battery powered and portable applications.

Applications

The device performance is guaranteed over the industrial

temperature range (−40˚C to +85˚C), while certain specs are

guaranteed over the extended temperature range (−40˚C to

+125˚C). Please contact National for full specifications over

the extended temperature range. The LM4120 is available in

a standard 5-pin SOT-23 package.

n Portable, battery powered equipment

n Instrumentation and process control

n Automotive & Industrial

n Test equipment

n Data acquisition systems

n Precision regulators

n Battery chargers

n Base stations

n Communications

n Medical equipment

Functional Block Diagram

Connection Diagram

10104702

Refer to the Ordering Information Table in this Data Sheet for Specific

Part Number

SOT23-5 Surface Mount Package

10104701

DS101047

www.national.com

Ordering Information

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

LM4120 Supplied as

1000 Units, Tape and

Reel

LM4120 Supplied as

3000 Units, Tape and

Reel

Initial Output Voltage Accuracy at 25˚C

And Temperature Coefficient

Top

Marking

LM4120AIM5-1.8

LM4120AIM5-2.0

LM4120AIM5-2.5

LM4120AIM5-3.0

LM4120AIM5-3.3

LM4120AIM5-4.1

LM4120AIM5-5.0

LM4120IM5-1.8

LM4120IM5-2.0

LM4120IM5-2.5

LM4120IM5-3.0

LM4120IM5-3.3

LM4120IM5-4.1

LM4120IM5-5.0

LM4120AIM5X-1.8

LM4120AIM5X-2.0

LM4120AIM5X-2.5

LM4120AIM5X-3.0

LM4120AIM5X-3.3

LM4120AIM5X-4.1

LM4120AIM5X-5.0

LM4120IM5X-1.8

LM4120IM5X-2.0

LM4120IM5X-2.5

LM4120IM5X-3.0

LM4120IM5X-3.3

LM4120IM5X-4.1

LM4120IM5X-5.0

R21A

R14A

R08A

R15A

R16A

R17A

R18A

R21B

R14B

R08B

R15B

R16B

R17B

R18B

0.2%, 50 ppm/˚C max (A grade)

0.5%, 50 ppm/˚C max

SOT-23 Package Marking Information

Only four fields of marking are possible on the SOT-23’s small surface. This

table gives the meaning of the four fields.

Field Information

First Field:

R = Reference

Second and third Field:

21 = 1.800V Voltage Option

14 = 2.048V Voltage Option

08 = 2.500V Voltage Option

15 = 3.000V Voltage Option

16 = 3.300V Voltage Option

17 = 4.096V Voltage Option

18 = 5.000V Voltage Option

Fourth Field:

A-B = Initial Reference Voltage Tolerance

A = 0.2%

B = 0.5%

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Lead Temperature:

Soldering, (10 sec.)

Vapor Phase (60 sec.)

Infrared (15 sec.)

+260˚C

+215˚C

+220˚C

Maximum Voltage on input or

enable pins

−0.3V to 14V

Indefinite

Operating Range (Note 1)

Storage Temperature

Range

Output Short-Circuit Duration

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

MA05B package − θ_JA

Power Dissipation

−65˚C to +150˚C

−40˚C to +85˚C

−40˚C to +125˚C

280˚C/W

350 mW

Ambient Temperature

Range

ESD Susceptibility (Note 3)

Human Body Model

Junction Temperature

Range

2 kV

Machine Model

200V

Electrical Characteristics

LM4120-1.8V, 2.048V and 2.5V ^{Unless otherwise specified V}_IN= 3.3V, I_LOAD= 0, C_OUT= 0.01µF, T_A

T_j= 25˚C. Limits with standard typeface are for T_j= 25˚C, and limits in boldface type apply over the −40˚C ≤ T_A≤ +85˚C

temperature range.

Typ (Note Max (Note

Symbol

Parameter

Conditions

Min (Note 5)

Units

Output Voltage Initial

Accuracy

LM4120A-1.800

LM4120A-2.048

LM4120A-2.500

LM4120-1.800

LM4120-2.048

LM4120-2.500

Temperature

0.2

V_OUT

0.5

TCV_OUT/˚C

−40˚C ≤ T_A≤ +125˚C

0.0007

0.03

ppm/˚c

Coefficient

∆V_OUT/∆V_IN

Line Regulation

3.3V ≤ V_IN≤ 12V

0.008

0.01

0.08

0.17

0.04

0.1

%/V

0 mA ≤ I_LOAD≤ 1 mA

1 mA ≤ I_LOAD≤ 5 mA

0.01

∆V_OUT/∆I_LOAD

Load Regulation

%/mA

−1 mA ≤ I_LOAD≤ 0 mA

−5 mA ≤ I_LOAD≤ −1 mA

I_LOAD= 0 mA

0.04

0.01

0.12

Dropout Voltage

(Note 6)

I_LOAD= +1 mA

I_LOAD= +5 mA

120

180

150

180

210

250

V_IN−V_OUT

V_N

I_S

Output Noise Voltage 0.1 Hz to 10 Hz

µV_PP

µA

(Note 8)

10 Hz to 10 kHz

Supply Current

160

250

275

I_SS

Power-down Supply

Current

Enable = 0.4V

−40˚C ≤ T_J≤ +85˚C

Enable = 0.2V

µA

V_H

Logic High Input

Voltage

2.4

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Electrical Characteristics

LM4120-1.8V, 2.048V and 2.5V ^{Unless otherwise specified V}_IN= 3.3V, I_LOAD= 0, C_OUT= 0.01µF, T_A= T_j

= 25˚C. Limits with standard typeface are for T_j= 25˚C, and limits in boldface type apply over the −40˚C ≤ T_A≤ +85˚C

temperature range. (Continued)

Typ (Note Max (Note

Symbol

Parameter

Conditions

Min (Note 5)

Units

V_L

I_H

I_L

Logic Low Input

Voltage

0.4

0.2

Logic High Input

Current

µA

Logic Low Input

Current

0.1

V_IN= 3.3V, V_OUT= 0

I_SC

Short Circuit Current

V_IN= 12V, V_OUT= 0

Hyst

Thermal Hysteresis

(Note 7)

−40˚C ≤ T_A≤ 125˚C

0.5

100

mV/V

ppm

1000 hrs. 25˚C

∆V_OUT

Long Term Stability

(Note 9)

Electrical Characteristics

LM4120-3.0V, 3.3V, 4.096V and 5.0V ^{Unless otherwise specified V}_IN= V_OUT+ 1V, I_LOAD= 0, C_OUT

0.01µF, T_A= T_j= 25˚C. Limits with standard typeface are for T_j= 25˚C, and limits in boldface type apply over the −40˚C ≤

T_A≤ +85˚C temperature range.

Typ (Note Max (Note

Symbol

Parameter

Conditions

Min (Note 5)

Units

Output Voltage Initial

Accuracy

LM4120A-3.000

LM4120A-3.300

LM4120A-4.096

LM4120A-5.000

LM4120-3.000

LM4120-3.300

LM4120-4.096

LM4120-5.000

Temperature

0.2

V_OUT

0.5

TCV_OUT/˚C

−40˚C ≤ T_A≤ +125˚C

0.0007

0.03

ppm/˚c

%/V

Coefficient

∆V_OUT/∆V_IN

Line Regulation

(V_OUT+ 1V) ≤ V_IN≤ 12V

0 mA ≤ I_LOAD≤ 1 mA

1 mA ≤ I_LOAD≤ 5 mA

0.008

0.01

0.08

0.17

0.04

0.1

0.01

∆V_OUT/∆I_LOAD

Load Regulation

%/mA

−1 mA ≤ I_LOAD≤ 0 mA

−5 mA ≤ I_LOAD≤ −1 mA

I_LOAD= 0 mA

0.04

0.01

0.12

Dropout Voltage

(Note 6)

I_LOAD= +1 mA

I_LOAD= +5 mA

120

180

150

180

210

250

V_IN−V_OUT

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Electrical Characteristics

LM4120-3.0V, 3.3V, 4.096V and 5.0V ^{Unless otherwise specified V}_IN= V_OUT+ 1V, I_LOAD= 0, C_OUT

0.01µF, T_A= T_j= 25˚C. Limits with standard typeface are for T_j= 25˚C, and limits in boldface type apply over the −40˚C ≤ T_A

≤ +85˚C temperature range. (Continued)

Typ (Note Max (Note

Symbol

Parameter

Conditions

Min (Note 5)

Units

V_N

I_S

Output Noise Voltage 0.1 Hz to 10 Hz

µV_PP

µA

(Note 8)

10 Hz to 10 kHz

Supply Current

160

250

275

I_SS

Power-down Supply

Current

Enable = 0.4V

−40˚C ≤ T_J≤ +85˚C

Enable = 0.2V

µA

V_H

V_L

I_H

Logic High Input

Voltage

2.4

0.4

2.4

Logic Low Input

Voltage

0.2

Logic High Input

Current

µA

I_L

Logic Low Input

Current

0.1

V_OUT= 0

I_SC

Short Circuit Current

V_IN= 12V, V_OUT= 0

−40˚C ≤ T_A≤ 125˚C

Hyst

Thermal Hysteresis

(Note 7)

0.5

100

mV/V

ppm

1000 hrs. 25˚C

∆V_OUT

Long Term Stability

(Note 9)

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

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see 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: Without PCB copper enhancements. The maximum power dissipation must be de-rated at elevated temperatures and is limited by T

(maximum

JMAX

junction temperature), θ (junction to ambient thermal resistance) and T (ambient temperature). The maximum power dissipation at any temperature is: PDiss

J-A

MAX

= (T

− T )/θ

up to the value listed in the Absolute Maximum Ratings.

JMAX

J-A

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: Typical numbers are at 25˚C and represent the most likely parametric norm.

Note 5: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Averaging Outgoing Quality Level (AOQL).

Note 6: Dropout voltage is the differential voltage between V

and V at which V

changes ≤ 1% from V

at V = 3.3V for 1.8V, 2.0V, 2.5V and V

OUT

1V for others.For 1.8V option, dropout voltage is not guaranteed over temperature. A parasitic diode exists between input and output pins; it will conduct if V

pulled to a higher voltage than V

Note 7: Thermal hysteresis is defined as the change in +25˚C output voltage before and after exposing the device to temperature extremes.

Note 8: Output noise voltage is proportional to V . V for other voltage option is calculated using (V /1.8) * V . V (2.5V) = (36µV /1.8) * 2.5 = 46µV .

OUT

N(1.8V)

OUT

Note 9: Long term stability is change in V

at 25˚C measured continuously during 1000 hrs.

REF

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LM4120 Typical Operating Characteristics

Unless otherwise specified, V_IN= 3.3V, V_OUT= 2.5V,

I_LOAD= 0, C_OUT= 0.022µF, T_A= 25˚C and V_EN= V_IN

Long Term Drift

Typical Temperature Drift

10104712

10104713

Short Circuit Current vs Temperature

Dropout Voltage vs Output Error

10104714

10104715

Dropout Voltage vs Load Current

Line Regulation

10104733

10104717

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LM4120 Typical Operating Characteristics Unless otherwise specified, V_IN= 3.3V, V_OUT= 2.5V,

I_LOAD= 0, C_OUT= 0.022µF, T_A= 25˚C and V_EN= V_IN. (Continued)

Load Regulation

GND Pin Current

10104719

10104718

GND Pin Current at No Load

vs Temperature

GND Pin Current vs Load

10104722

10104721

0.1Hz to 10Hz output Noise

Output Impedance vs Frequency

10104723

10104724

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LM4120 Typical Operating Characteristics Unless otherwise specified, V_IN= 3.3V, V_OUT= 2.5V,

I_LOAD= 0, C_OUT= 0.022µF, T_A= 25˚C and V_EN= V_IN. (Continued)

PSRR vs Frequency

Start-Up Response

Load Step Response

Line Step Response

10104726

10104728

10104730

10104725

Enable Response

10104727

Load Step Response

10104729

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LM4120 Typical Operating Characteristics Unless otherwise specified, V_IN= 3.3V, V_OUT= 2.5V,

I_LOAD= 0, C_OUT= 0.022µF, T_A= 25˚C and V_EN= V_IN. (Continued)

Thermal Hysteresis

Enable Pin Current

10104716

10104731

must be taken close to GND to turn the part off (see spec.

table for thresholds). There is a minimum slew rate on this

pin of about 0.003V/µS to prevent glitches on the output. All

of these conditions can easily be met with ordinary CMOS or

TTL logic. If the shutdown feature is not required, then this

pin can safely be connected directly to the input supply.

Floating this pin is not recommended.

Pin Functions

Output (Pin 5): Reference Output.

Input (Pin 4):Positive Supply.

Ground (Pin 2):Negative Supply or Ground Connection.

Enable (Pin 3):Pulled to input for normal operation. Forcing

this pin to ground will turn-off the output.

REF (Pin 1):REF Pin. This pin should be left unconnected.

Application Hints

The standard application circuit for the LM4120 is shown in

Figure 1. It is designed to be stable with ceramic output

capacitors in the range of 0.022µF to 0.047µF. Note that

0.022µF is the minimum required output capacitor. These

capacitors typically have an ESR of about 0.1 to 0.5Ω.

Smaller ESR can be tolerated, however larger ESR can not.

The output capacitor can be increased to improve load tran-

sient response, up to about 1µF. However, values above

0.047µF must be tantalum. With tantalum capacitors, in the

1µF range, a small capacitor between the output and the

reference pin is required. This capacitor will typically be in

the 50pF range. Care must be taken when using output

capacitors of 1µF or larger. These application must be thor-

oughly tested over temperature, line and load.

10104732

FIGURE 1.

INPUT CAPACITOR

Noise on the power-supply input can effect the output noise,

but can be reduced by using an optional bypass capacitor

between the input pin and the ground.

An input capacitor is typically not required. However, a 0.1µF

ceramic can be used to help prevent line transients from

entering the LM4120. Larger input capacitors should be

tantalum or aluminium.

PRINTED CIRCUIT BOARD LAYOUT CONSIDERATION

The mechanical stress due to PC board mounting can cause

the output voltage to shift from its initial value. References in

SOT packages are generally less prone to assembly stress

than devices in Small Outline (SOIC) package.

The reference pin is sensitive to noise, and capacitive load-

ing. Therefore, the PCB layout should isolate this pin as

much as possible.

To reduce the stress-related output voltage shifts, mount the

reference on the low flex areas of the PC board such as near

to the edge or the corner of the PC board.

The enable pin is an analog input with very little hysteresis.

About 6µA into this pin is required to turn the part on, and it

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Typical Application Circuits

Voltage Reference with Complimentary Output

Voltage Reference with Negative Output

10104706

Precision High Current Low Droput Regulator

10104703

Precision High Current Low Dropout Regulator

10104707

Stacking Voltage References

10104704

Precision High Current

Negative Voltage Regulator

10104708

Precision Voltage Reference

with Force and Sense Output

10104705

10104709

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Typical Application Circuits

Power Supply Splitter

(Continued)

Programmable Current Source

10104720

10104710

Precision Regulator with Current Limiting Circuit

10104711

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Physical Dimensions inches (millimeters) unless otherwise noted

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.

LIFE SUPPORT POLICY

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.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products

Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain

no ‘‘Banned Substances’’ as defined in CSP-9-111S2.

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Support Center

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Fax: +49 (0) 180-530 85 86

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Support Center

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Email: jpn.feedback@nsc.com

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LM4120_05 [NSC]

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