LM4120IM5X-1.8 [NSC]

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


型号：	LM4120IM5X-1.8
厂家：	National Semiconductor
描述：	Precision Micropower Low Dropout Voltage Reference 精密微功耗低压差电压基准电源电路参考电压源光电二极管
文件：	总11页 (文件大小：292K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

February 2000

LM4120

Precision Micropower Low Dropout Voltage Reference

General Description

The LM4120 is a precision low power low dropout bandgap

voltage reference with up to 5 mA output current source and

sink capability.

Features

n Small SOT23-5 package

n Low dropout voltage:

n High output voltage accuracy:

n Source and Sink current output:

n Supply current:

120 mV Typ 1 mA

0.2

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.

5 mA

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

DS101047-2

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

Part Number

SOT23-5 Surface Mount Package

DS101047-1

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:

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

0.2%

0.5

www.national.com

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)

Output Short-Circuit Duration

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

MA05B package − θ_JA

Power Dissipation

Storage Temperature Range

Ambient Temperature Range

Junction Temperature Range

−65˚C to +150˚C

−40˚C to +85˚C

−40˚C to +125˚C

280˚C/W

350 mW

ESD Susceptibility (Note 3)

Human Body Model

Machine Model

2 kV

200V

Electrical Characteristics

LM4120-1.8V, 2.048V and 2.5V ^{Unless otherwise specified V}_IN3.3V, I_LOAD0, C_OUT0.01µF, T_AT_j

25˚C. Limits with standard typeface are for T_j25˚C, and limits in boldface type apply over the −40˚C ≤ T_A≤ +85˚C tem-

perature range.

Symbol

Parameter

Conditions

Min (Note 5) Typ (Note 4) Max (Note 5)

Units

Output Voltage Initial

Accuracy

LM4120A-1.800

LM4120A-2.048

LM4120A-2.500

0.2

V_OUT

LM4120-1.800

LM4120-2.048

LM4120-2.500

0.5

TCV_OUT/˚C

Temperature Coefficient

Line Regulation

−40˚C ≤ T_A≤ +125˚C

3.3V ≤ V_IN≤ 12V

ppm/˚c

∆V_OUT/∆V_IN

0.0007

0.008

0.01

0 mA ≤ I_LOAD≤ 1 mA

1 mA ≤ I_LOAD≤ 5 mA

0.03

0.01

0.08

0.17

0.04

0.1

/mA

∆V_OUT/∆I_LOADLoad Regulation

−1 mA ≤ I_LOAD≤ 0 mA

−5 mA ≤ I_LOAD≤ −1 mA

I_LOAD= 0 mA

0.04

0.01

0.12

I_LOAD= +1 mA

I_LOAD= +5 mA

120

180

150

180

V_IN−V_OUT

Dropout Voltage (Note 6)

210

250

V_N

Output Noise Voltage (Note 8) 0.1 Hz to 10 Hz

10 Hz to 10 kHz

µV_PP

µA

I_S

Supply Current

160

250

275

I_SS

Power-down Supply Current

Enable 0.4V

−40˚C ≤ T_J≤ +85˚C

µA

Enable 0.2V

V_H

V_L

I_H

Logic High Input Voltage

Logic Low Input Voltage

Logic High Input Current

2.4

0.4

2.4

µA

0.2

www.national.com

Electrical Characteristics

LM4120-1.8V, 2.048V and 2.5V ^{Unless otherwise specified V}_IN3.3V, I_LOAD0, C_OUT0.01µF, T_AT_j

25˚C. Limits with standard typeface are for T =

25˚C, and limits in boldface type apply over the −40˚C ≤ T_A≤ +85˚C

temperature range. (Continued)

Symbol Parameter

Conditions

Min (Note 5) Typ (Note 4) Max (Note 5)

Units

I_L

Logic Low Input Current

Short Circuit Current

0.1

µA

V_IN3.3V, V_OUT

I_SC

V_IN12V, V_OUT

Hyst

Thermal Hysteresis

(Note 7)

−40˚C ≤ T_A≤ 125˚C

0.5

mV/V

ppm

∆V_OUT

Long Term Stability

(Note 9)

1000 hrs. 25˚C

100

Electrical Characteristics

LM4120-3.0V, 3.3V, 4.096V and 5.0V ^{Unless otherwise specified V}_INV_OUT+ 1V, I_LOAD0, C_OUT

0.01µF, T_AT_j25˚C. Limits with standard typeface are for T_j25˚C, and limits in boldface type apply over the −40˚C ≤

T_A≤ +85˚C temperature range.

Symbol

Parameter

Conditions

Min (Note 5) Typ (Note 4) Max (Note 5) Units

Output Voltage Initial

Accuracy

LM4120A-3.000

LM4120A-3.300

LM4120A-4.096

LM4120A-5.000

0.2

0.5

V_OUT

LM4120-3.000

LM4120-3.300

LM4120-4.096

LM4120-5.000

TCV_OUT/˚C

Temperature Coefficient

Line Regulation

−40˚C ≤ T_A≤ +125˚C

ppm/˚c

∆V_OUT/∆V_IN

(V_OUT+ 1V) ≤ V_IN≤ 12V

0.0007

0.008

0.01

0 mA ≤ I_LOAD≤ 1 mA

1 mA ≤ I_LOAD≤ 5 mA

0.03

0.01

0.08

0.17

0.04

0.1

/mA

∆V_OUT/∆I_LOADLoad Regulation

−1 mA ≤ I_LOAD≤ 0 mA

−5 mA ≤ I_LOAD≤ −1 mA

I_LOAD= 0 mA

0.04

0.01

0.12

I_LOAD= +1 mA

I_LOAD= +5 mA

120

180

150

180

V_IN−V_OUT

Dropout Voltage (Note 6)

210

250

V_N

Output Noise Voltage (Note 8) 0.1 Hz to 10 Hz

10 Hz to 10 kHz

µV_PP

µA

I_S

Supply Current

160

250

275

I_SS

Power-down Supply Current

Enable 0.4V

−40˚C ≤ T_J≤ +85˚C

µA

Enable 0.2V

www.national.com

Electrical Characteristics

LM4120-3.0V, 3.3V, 4.096V and 5.0V ^{Unless otherwise specified V}_INV_OUT+ 1V, I_LOAD0, C_OUT

0.01µF, T_AT_j25˚C. Limits with standard typeface are for T_j25˚C, and limits in boldface type apply over the −40˚C ≤

T_A≤ +85˚C temperature range. (Continued)

Symbol

Parameter

Conditions

Min (Note 5) Typ (Note 4) Max (Note 5) Units

V_H

V_L

Logic High Input Voltage

2.4

Logic Low Input Voltage

0.4

0.2

I_H

I_L

Logic High Input Current

Logic Low Input Current

µA

0.1

V_OUT

I_SC

Short Circuit Current

V_IN12V, V_OUT

Hyst

Thermal Hysteresis

(Note 7)

−40˚C ≤ T_A≤ 125˚C

0.5

mV/V

ppm

∆V_OUT

Long Term Stability

(Note 9)

1000 hrs. 25˚C

100

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 guar-

anteed 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 junction

JMAX

temperature), θ

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

J-A

MAX

− T )/θ

up to the value listed in the Absolute Maximum Ratings.

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 di-

rectly 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 (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

LM4120 Typical Operating Characteristics Unless otherwise specified, V_IN3.3V, V_OUT2.5V,

I_LOAD0, C_OUT0.022µF, T_A25˚C and V_ENV_IN

Long Term Drift

Typical Temperature Drift

Short Circuit Current vs

Temperature

DS101047-12

DS101047-13

DS101047-14

www.national.com

LM4120 Typical Operating Characteristics Unless otherwise specified, V_IN3.3V, V_OUT2.5V,

I_LOAD0, C_OUT0.022µF, T_A25˚C and V_ENV_IN. (Continued)

Dropout Voltage vs Output Error

Line Regulation

Dropout Voltage vs Load Current

DS101047-33

DS101047-17

DS101047-15

Load Regulation

GND Pin Current

GND Pin Current at No Load

vs Temperature

DS101047-19

DS101047-18

DS101047-21

GND Pin Current vs Load

0.1Hz to 10Hz output Noise

Output Impedance vs Frequency

DS101047-23

DS101047-22

DS101047-24

www.national.com

LM4120 Typical Operating Characteristics Unless otherwise specified, V_IN3.3V, V_OUT2.5V,

I_LOAD0, C_OUT0.022µF, T_A25˚C and V_ENV_IN. (Continued)

PSRR vs Frequency

Enable Response

Start-Up Response

DS101047-27

DS101047-26

DS101047-25

Load Step Response

Line Step Response

DS101047-28

DS101047-29

DS101047-30

Thermal Hysteresis

Enable Pin Current

DS101047-16

DS101047-31

www.national.com

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 ca-

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

0.022µF is the minimum required output capacitor. These ca-

pacitors typically have an ESR of about 0.1 to 0.5Ω. Smaller

ESR can be tolerated, however larger ESR can not. The out-

put capacitor can be increased to improve load transient re-

sponse, 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 refer-

ence pin is required. This capacitor will typically be in the

50pF range. Care must be taken when using output capaci-

tors of 1µF or larger. These application must be thoroughly

tested over temperature, line and load.

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

ceramic can be used to help prevent line transients from en-

tering the LM4120. Larger input capacitors should be tanta-

lum or aluminium.

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

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

much as possible.

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

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.

DS101047-32

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.

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.

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.

www.national.com

Typical Application Circuits

Voltage Reference with Complimentary Output

Voltage Reference with Negative Output

DS101047-6

Precision High Current Low Droput Regulator

DS101047-3

Precision High Current Low Dropout Regulator

DS101047-7

Stacking Voltage References

DS101047-4

Precision High Current

Negative Voltage Regulator

DS101047-8

DS101047-5

www.national.com

Typical Application Circuits

Precision Regulator with Current Limiting Circuit

(Continued)

Precision Voltage Reference

with Force and Sense Output

DS101047-9

DS101047-11

Programmable Current Source

Power Supply Splitter

DS101047-20

DS101047-10

www.national.com

Physical Dimensions inches (millimeters) unless otherwise noted

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.

National Semiconductor

Corporation

Americas

Tel: 1-800-272-9959

Fax: 1-800-737-7018

Email: support@nsc.com

National Semiconductor

Europe

National Semiconductor

Asia Pacific Customer

Response Group

Tel: 65-2544466

Fax: 65-2504466

National Semiconductor

Japan Ltd.

Tel: 81-3-5639-7560

Fax: 81-3-5639-7507

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

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

English Tel: +44 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

Email: ap.support@nsc.com

www.national.com

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.

LM4120IM5X-1.8 [NSC]

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