Precision Low Drift SOT-23

Voltage Reference with Shutdown

ADR318

FEATURES

Initial accuracy: ±5 mV maximum, ±0.27% maximum

Low temperature coefficient: 25 ppm/°C maximum

Load regulation: 100 ppm/mA

Line regulation: 25 ppm/V

Low supply headroom: 0.6 V

Wide operating range: (V

OUT

+ 0.6 V) to 15 V

Low power: 120 μA maximum

Shutdown to less than 3 μA maximum

Output current: 5 mA

Wide temperature range: 0°C to 70°C

Tiny 5-lead SOT-23 package

PIN CONFIGURATION

SHDN

V

IN

V

OUT(SENSE)

1

2

3

5

GND

ADR318

4

V

OUT(FORCE)

Figure 1. 5-Lead SOT-23

APPLICATIONS

Battery-powered instrumentation

Portable medical instruments

Data acquisition systems

Industrial process control systems

Fault protection critical systems

GENERAL DESCRIPTION

The ADR318 is a precision 1.8 V band gap voltage reference

featuring high accuracy, high stability, and low power

consumption in a tiny footprint. Patented temperature drift

curvature correction techniques minimize nonlinearity of the

voltage change with temperature. The wide operating range and

low power consumption with additional shutdown capability

make the part ideal for battery-powered applications. The

V

OUT (SENSE)

pin enables greater accuracy by supporting full

Kelvin operation in PCBs employing thin or long traces.

The ADR318 is a low dropout voltage (LDV) device that

provides a stable output voltage from supplies as low as 600 mV

above the output voltage. This device is specified over the

industrial operating range of 0°C to 70°C, and is available in a

tiny 5-lead SOT-23 package.

The combination of V

OUT (SENSE)

and shutdown functions also

enables a number of unique applications, combining precision

reference/regulation with fault decision and overcurrent

protection.

See the Applications section for details.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

03431-001

TOP VIEW

(Not to Scale)

ADR318

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Pin Configuration............................................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Electrical Characteristics............................................................. 3

Absolute Maximum Ratings............................................................ 4

Thermal Resistance ...................................................................... 4

ESD Caution.................................................................................. 4

Typical Performance Characteristics ............................................. 5

Terminology ...................................................................................... 8

Theory of Operation .........................................................................9

Device Power Dissipation Considerations.................................9

Shutdown Mode Operation .........................................................9

Applications..................................................................................... 10

Basic Voltage Reference Connection ....................................... 10

Precision Negative Voltage Reference Without Precision

Resistors....................................................................................... 10

General-Purpose Current Source ............................................ 10

High Power Performance with Current Limit ........................... 10

Outline Dimensions ....................................................................... 12

Ordering Guide .......................................................................... 12

REVISION HISTORY

10/06—Rev. 0 to Rev. A

Updated Format..................................................................Universal

Changes to Ordering Guide .......................................................... 12

Updated Outline Dimensions ....................................................... 12

1/03—Revision 0: Initial Version

Rev. A | Page 2 of 12

ADR318

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

T

A

= T

MIN

to T

MAX

, V

IN

= 5 V, unless otherwise noted

1

.

Table 1.

Parameter

Initial Accuracy

Initial Accuracy Error

Temperature Coefficient

Minimum Supply Voltage Headroom

Line Regulation

Load Regulation

Quiescent Current

Voltage Noise

Turn-On Settling Time

Long-Term Stability

2

Output Voltage Hysteresis

Ripple Rejection Ratio

Short Circuit to Ground

Shutdown Supply Current

Shutdown Logic Input Current

Shutdown Logic Low

Shutdown Logic High

1

2

Symbol

V

O

V

OERR

TC

VO

V

IN

– V

OUT

ΔV

OUT

/ΔV

IN

ΔV

OUT

/ΔI

LOAD

I

SY

e

N

t

R

ΔV

OUT

V

O_HYS

RRR

I

SC

I

SHDN

I

LOGIC

V

INL

V

INH

Conditions

Min

1.795

−0.27

600

Typ

1.8

5

10

0°C to 70°C

V

IN

= 2.5 V to 15 V,

0°C < T

A

< 70°C

V

IN

= 3 V, I

LOAD

= 0 mA to 5 mA,

0°C < T

A

< 70°C

No load

0°C < T

A

< 70°C

0.1 Hz to 10 Hz

Max

1.802

+0.27

25

100

Unit

V

%

ppm/°C

mV

ppm/V

ppm/mA

μA

μV p-p

μs

ppm/1000 hours

ppm

dB

mA

μA

nA

V

100

5

20

50

40

85

25

30

120

140

f

IN

= 60 Hz

V

IN

= 5.0 V

V

IN

= 15.0 V

3

500

0.8

2.4

T

MIN

= 0°C, T

MAX

= 70°C.

The long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.

Rev. A | Page 3 of 12

ADR318

ABSOLUTE MAXIMUM RATINGS

At 25°C, unless otherwise noted.

Table 2.

Parameter

Supply Voltage

Output Short-Circuit Duration to GND

Storage Temperature Range: RJ-5 Package

Operating Temperature Range

Junction Temperature Range: RJ-5 Package

Lead Temperature Range (Soldering, 60 sec)

Rating

18 V

Observe derating

curves

–65°C to +125°C

0°C to 70°C

–65°C to +150°C

300°C

Stresses above those listed under Absolute Maximum Ratings

may cause permanent damage to the device. This is a stress

rating only; functional operation of the device at these or any

other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect

device reliability.

THERMAL RESISTANCE

θ

JA

is specified for the worst-case conditions, that is, a device

soldered in a circuit board for surface-mount packages.

Table 3. Thermal Resistance

Package Type

5-Lead SOT-23 (RJ-5)

θ

JA

230

θ

JC

146

Unit

°C/W

ESD CAUTION

Rev. A | Page 4 of 12

ADR318

TYPICAL PERFORMANCE CHARACTERISTICS

1.802

0

V

IN

= 2.5V TO 15V

1.801

MEAN + STANDARD DEVIATION

LINE REGULATION (ppm/mV)

03431-002

–5

V

OUT

(V)

–10

1.800

MEAN

–15

1.799

MEAN – STANDARD DEVIATION

–20

0

10

20

30

40

50

60

70

0

10

20

30

40

50

60

70

TEMPERATURE (°C)

Figure 2. Typical Output Voltage vs. Temperature

110

70°C

2.5

Figure 5. Line Regulation vs. Temperature

SUPPLY CURRENT (µA)

100

25°C

90

0°C

2.3

V

IN_MIN

(V)

0°C

2.1

25°C

70°C

80

1.9

03431-003

5.0

7.5

10.0

12.5

15.0

0

1

2

3

4

5

INPUT VOLTAGE (V)

LOAD CURRENT (mA)

Figure 3. Supply Current vs. Input Voltage

–30

Figure 6. Minimum Input Voltage vs. Load Current

LOAD REGULATION (ppm/mA)

–40

–50

10V

–60

2.5V

–70

VOLTAGE (2mV/DIV)

03431-004

–80

0

10

20

30

40

50

60

70

TIME (400ms/DIV)

TEMPERATURE (°C)

Figure 4. Load Regulation vs. Temperature

Figure 7. Typical Output Voltage Noise 0.1 Hz to 10 Hz

Rev. A | Page 5 of 12

03431-007

03431-006

70

2.5

1.7

03431-005

1.798

–25

参数名称	属性值
类别
厂商名称	ADI(亚德诺半导体)
包装	剪切带（CT）Digi-Reel® 得捷定制卷带
安装类型	表面贴装型
封装/外壳	SC-74A，SOT-753
供应商器件封装	SOT-23-5
基本产品编号	ADR318

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