TEXAS INSTRUMENTS REF2912 Technical data

查询REF2912供应商

REF2912
REF2920
REF2925
REF2930
REF2933
REF2940

SBVS033A – JUNE 2002 – REVISED MARCH 2003

100ppm/°C, 50µA in SOT23-3

CMOS VOLTAGE REFERENCE

FEATURES

●

Micro

SIZE PACKAGE: SOT23-3

● LOW DROPOUT: 1mV

● HIGH OUTPUT CURRENT: 25mA

● LOW TEMPERATURE DRIFT: 100ppm/

°C max

● HIGH ACCURACY: 2%

● LOW IQ: 50µA max

APPLICATIONS

● PORTABLE, BATTERY-POWERED EQUIPMENT

● DATA ACQUISITION SYSTEMS

● MEDICAL EQUIPMENT

● HAND-HELD TEST EQUIPMENT

REF2912

1IN

REF2920

2OUT

REF2925
REF2930
REF2933
REF2940

SOT23-3

3 GND

DESCRIPTION

The REF29xx is a precision, low-power, low-voltage dropout
voltage reference family available in a tiny SOT23-3.

The REF29xx’s small size and low power consumption
(50µA max) make it ideal for portable and battery-powered
applications. The REF29xx does not require a load capacitor,
but is stable with any capacitive load.

Unloaded, the REF29xx can be operated with supplies within
1mV of output voltage. All models are specified for the wide
temperature range, –40°C to +125°C.

PRODUCT VOLTAGE (V)

REF2912 1.25
REF2920 2.048
REF2925 2.5
REF2930 3.0
REF2933 3.3
REF2940 4.096

DROPOUT VOLTAGE vs LOAD CURRENT

350

300

250

200

150

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

www.ti.com

100

Dropout Voltage (mV)

50

0

0 5 10 15 20 25 30

Load Current (mA)

Copyright © 2002-2003, Texas Instruments Incorporated

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V+ to V–................................................................... 7.0V

Output Short-Circuit

Operating Temperature .................................................. –40°C to +125°C

Storage Temperature ..................................................... –65°C to +125°C

Junction Temperature .................................................................... +150°C

Lead Temperature (soldering, 10s) ............................................... +300°C

NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these, or any other conditions beyond those specified, is not implied.
(2) Short-circuit to ground.

(2)

.............................................................. Continuous

(1)

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instru­ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degrada­tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.

PACKAGE/ORDERING INFORMATION

PRODUCT PACKAGE-LEAD DESIGNATOR

PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT

REF2912 SOT23-3 DBZ –40°C to +125°C R29A REF2912AIDBZT Tape and Reel, 250

(1)

SPECIFIED

RANGE MARKING NUMBER MEDIA, QUANTITY

" """"REF2912AIDBZR Tape and Reel, 3000

REF2920 SOT23-3 DBZ –40°C to +125°C R29B REF2920AIDBZT Tape and Reel, 250

" """"REF2920AIDBZR Tape and Reel, 3000

REF2925 SOT23-3 DBZ –40°C to +125°C R29C REF2925AIDBZT Tape and Reel, 250

" """"REF2925AIDBZR Tape and Reel, 3000

REF2930 SOT23-3 DBZ –40°C to +125°C R29D REF2930AIDBZT Tape and Reel, 250

" """"REF2930AIDBZR Tape and Reel, 3000

REF2933 SOT23-3 DBZ –40°C to +125°C R29E REF2933AIDBZT Tape and Reel, 250

" """"REF2933AIDBZR Tape and Reel, 3000

REF2940 SOT23-3 DBZ –40°C to +125°C R29F REF2940AIDBZT Tape and Reel, 250

" """"REF2940AIDBZR Tape and Reel, 3000

NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.

ELECTRICAL CHARACTERISTICS

Boldface limits apply over the specified temperature range, TA = –40°C to +125°C.

At TA = +25°C, I

PARAMETER CONDITIONS MIN TYP MAX UNITS

OUTPUT VOLTAGE V

Initial Accuracy 2%

NOISE

Output Voltage Noise f = 0.1Hz to 10Hz 20 µVp-p
Voltage Noise f = 10Hz to 10kHz 42 µVrms

LINE REGULATION 1.8V ≤ V

OUTPUT VOLTAGE V

Initial Accuracy 2%

NOISE

Output Voltage Noise f = 0.1Hz to 10Hz 28 µVp-p
Voltage Noise f = 10Hz to 10kHz 65 µVrms

LINE REGULATION V

OUTPUT VOLTAGE V

Initial Accuracy 2%

NOISE

Output Voltage Noise f = 0.1Hz to 10Hz 35 µVp-p
Voltage Noise f = 10Hz to 10kHz 80 µVrms

LINE REGULATION V

= 0mA, VIN = 5V, unless otherwise noted.

LOAD

OUT

OUT

OUT

REF29xx

REF2912-1.25V

1.225 1.25 1.275 V

≤ 5.5V 60 190 µV/V

IN

REF2920

2.007 2.048 2.089 V

+ 50mV ≤ VIN ≤ 5.5V 110 290 µV/V

REF

REF2925

2.450 2.50 2.550 V

+ 50mV ≤ VIN ≤ 5.5V 120 325 µV/V

REF

2

www.ti.com

REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

ELECTRICAL CHARACTERISTICS (Cont.)

Boldface limits apply over the specified temperature range, TA = –40°C to +125°C.

At TA = +25°C, I

PARAMETER CONDITIONS MIN TYP MAX UNITS

OUTPUT VOLTAGE V

Initial Accuracy 2%

NOISE

Output Voltage Noise f = 0.1Hz to 10Hz µVp-p
Voltage Noise f = 10Hz to 10kHz µVrms

LINE REGULATION V

OUTPUT VOLTAGE V

Initial Accuracy 2%

NOISE

Output Voltage Noise f = 0.1Hz to 10Hz 41 µVp-p
Voltage Noise f = 10Hz to 10kHz 105 µVrms

LINE REGULATION V

OUTPUT VOLTAGE V

Initial Accuracy 2%

NOISE

Output Voltage Noise f = 0.1Hz to 10Hz 45 µVp-p
Voltage Noise f = 10Hz to 10kHz 128 µVrms

LINE REGULATION V

OUTPUT VOLTAGE TEMP DRIFT

OUTPUT CURRENT I
LONG-TERM STABILITY

LOAD REGULATION

THERMAL HYSTERESIS
DROPOUT VOLTAGE V
SHORT-CIRCUIT CURRENT I
TURN-ON SETTLING TIME to 0.1% at V
POWER SUPPLY

Voltage V

Over Temperature –40

Quiescent Current I

Over Temperature –40

TEMPERATURE RANGE

Specified Range –40 +125 °C
Operating Range –40 +125 °C
Storage Range –65 +150 °C
Thermal Resistance
SOT23-3 Surface-Mount

NOTES: (1) Minimum supply voltage for REF2912 is 1.8V. (2) Box Method used to determine over temperature drift. (3) Typical value of load regulation reflects
measurements using a force and sense contacts, see text “Load Regulation”. (4) Thermal hysteresis procedure is explained in more detail in Applications Information
section of data sheet. (5) For I

= 0mA, VIN = 5V, unless otherwise noted.

LOAD

OUT

OUT

OUT

REF2912, REF2920, REF2925, REF2930, REF2933, REF2940

(2)

dV

/dT

OUT

LOAD

(3)

dV

/dI

OUT

LOAD

(4)

> 0, see Typical Characteristic curves.

L

dT 25 100 ppm

– V

IN

OUT

SC

S

Q

θ

JC

θ

JA

REF29xx

REF2930

2.940 3.0 3.06 V

+ 50mV ≤ VIN ≤ 5.5V 120 375 µV/V

REF

REF2933

3.234 3.30 3.366 V

+ 50mV ≤ VIN ≤ 5.5V 130 400 µV/V

REF

REF2940

4.014 4.096 4.178 V

+ 50mV ≤ VIN ≤ 5.5V 160 410 µV/V

REF

°C ≤ T

–40

0mA < I

V

IN

≤ +125°C 35 100 ppm/°C

A

25 mA

0-1000

1000-2000

LOAD

= V

REF

H

H

< 25mA, 3 100 µV/mA

+ 500mV

(1)

24 ppm
15 ppm

150 mV

45 mA

= 5V with CL = 0 120 µs

IN

IL = 0

°C ≤ T

≤ +125°CV

A

°C ≤ T

≤ +125°C59µA

A

V

REF

(5)

+ 0.001

+ 0.05 5.5 V

REF

42 50 µA

5.5 V

110 °C/W
336 °C/W

REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

www.ti.com

3

TYPICAL CHARACTERISTICS

At TA = +25°C, VIN = +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted.

TEMPERATURE DRIFT (0°C to +70°C)

50
45
40
35
30
25
20

Number of Units

15
10

5
0

51015202530 4035 45 50 55 6560

Drift (ppm/°C)

2.502

2.500

2.498

2.496

OUTPUT VOLTAGE vs TEMPERATURE

TEMPERATURE DRIFT (–40°C to +125°C)

100

90
80
70
60
50
40

Number of Units

30
20
10

0

51015202530 4035 45 50 55 6560

Drift (ppm/°C)

MAXIMUM LOAD CURRENT vs TEMPERATURE

35

30

25

20

2.494

Output Voltage (V)

2.492

2.490
–40 –20 0 20 6040 80 100 120 140

Temperature (°C)

6

5

4

3

2

Load Regulation (µV/mA)

1

0

–40 –20 0 20 6040 80 100 120 140

LOAD REGULATION vs TEMPERATURE

Temperature (°C)

15

10

Maximum Load Current (mA)

5

–40 –20 0 20 6040 80 100 120 140

Temperature (°C)

60

50

40

30

(µA)

Q

I

20

10

0

QUIESCENT CURRENT vs TEMPERATURE

–40 –20 0 20 6040 80 100 120 140

Temperature (°C)

4

www.ti.com

REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

TYPICAL CHARACTERISTICS (Cont.)

OUTPUT IMPEDANCE vs FREQUENCY

100

10

1

0.1

0.01

Output Impedance (dB)

1 10 100 1k 10k 100k

Frequency (Hz)

OUTPUT VOLTAGE vs LOAD CURRENT

2.50152

2.50000

2.49848

2.49696

2.49544

2.49392

2.49824

2.49088

2.48936

Output Voltage (V)

0 5 10 15 20 25 30

Load Current (mA)

OUTPUT VOLTAGE vs SUPPLY VOLTAGE (No Load)

2.50138

2.50000

2.49862

2.49724

2.49586

2.49448

2.49310

2.49172

2.49034

2.48896

Output Voltage (V)

2.5 3 3.5 4 4.5 5 5.5 6
Supply (V)

At TA = +25°C, VIN = +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted.

200

150

100

50

Line Regulation (µV/V)

0

–50

–40 –20 0 20 6040 80 100 120 140

90
80
70
60
50
40

PSRR (dB)

30
20
10

0

1 10 100 1k 10k 100k

LINE REGULATION vs TEMPERATURE

Temperature (°C)

POWER-SUPPLY REJECTION RATIO vs FREQUENCY

Frequency (Hz)

OUTPUT VOLTAGE

2.5008

2.5000

2.4992

2.4984

2.4976

2.4968

2.4967

Output Voltage (V)

2.4952

2.4944

2.4936

2.5 3 3.5 4 4.5 5 5.5 6

REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

vs SUPPLY VOLTAGE (I

Supply (V)

LOAD

= 25mA)

5

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TYPICAL CHARACTERISTICS (Cont.)

At TA = +25°C, VIN = +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted.

3V/div1V/div

500mV/div50mV/div

STEP RESPONSE, CL = 0, 3V START-UP

V

IN

V

OUT

40µs/div

LINE TRANSIENT RESPONSE

V

IN

5V/div1V/div

STEP RESPONSE, CL = 0, 5V START-UP

V

IN

V

OUT

10µs/div

0-1mA LOAD TRANSIENT (CL = 0)

IL = 1mA

IL = 0mA

V

OUT

IL = 5mA

V

OUT

20mV/div

10µs/div

0-5mA LOAD TRANSIENT (CL = 0)

IL = 0mA

10µs/div

V

OUT

20mV/div

IL = 6mA

V

OUT

20mV/div

10µs/div

1-6mA LOAD TRANSIENT (CL = 1µF)

IL = 0mA

40µs/div

6

www.ti.com

REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

TYPICAL CHARACTERISTICS (Cont.)

0.1Hz TO 10Hz NOISE

10µV/div

1.0s/div

At TA = +25°C, VIN = +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted.

1-25mA LOAD TRANSIENT (CL = 1µF)

IL = 25mA

V

OUT

20mV/div

80
70
60
50
40
30
20
10

Absolute Output Voltage Drift (ppm)

0

LONG-TERM STABILITY 0 TO 1000 HOURS

0 100 200 300 400 500 600 700 800 900 1000

IL = 1mA

100µs/div

Time (hours)

80
70
60
50
40
30
20
10

Absolute Output Voltage Drift (ppm)

LONG-TERM STABILITY 1000 TO 2000 HOURS

0

1000 1100 1400 1500 1700

1200 1300 1600 1800 1900 2000

Time (hours)

80
70
60
50
40
30
20
10

Absolute Output Voltage Drift (ppm)

0

0 200 400 600 800 1000 1200 1400 1600 1800 2000

REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

LONG-TERM STABILITY 0 TO 2000 HOURS

Time (hours)

7

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THEORY OF OPERATION

The REF29xx is a series, CMOS, precision bandgap voltage
reference. It’s basic topology is shown in Figure 1. The
transistors Q
density of Q
two base-emiter voltages, Vbe
temperature coefficient and is forced across resistor R1. This
voltage is gained up and added to the base-emitter voltage
of Q

, which has a negative coefficient. The resulting output

2

voltage is virtually independent of temperature. The curvature
of the bandgap voltage, as seen in the typical curve, “Output
Voltage vs Temperature”, is due to the slightly nonlinear
temperature coefficient of the base-emitter voltage of Q

, and Q2, are biased such that the current

1

is greater than that of Q2. The difference of the

1

+

+

Vbe

Vbe

1

2

–

Q

1

–

– Vbe2, has a positive

1

R

1

Q

2

.

2

The REF29xx features a low quiescent current, which is
extremely stable over changes in both temperature and
supply. The typical room temperature quiescent current is
42µA, and the maximum quiescent current over temperature
is just 59µA. Additionally, the quiescent current typically
changes less than 2.5µA over the entire supply range, as
shown in Figure 3.

42.5

42.0

41.5

(µA)

Q

I

41.0

40.5

40.0
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6

V

(V)

IN

FIGURE 3. Supply Current vs Supply Voltage.

FIGURE 1. Simplified Schematic of Bandgap Reference.

APPLICATION INFORMATION

The REF29xx does not require a load capacitor, and is stable
with any capacitive load. Figure 2 shows typical connections
required for operation of the REF29xx. A supply bypass
capacitor of 0.47µF is recommended.

V

IN

V

OUT

FIGURE 2. Typical Connections for Operating REF29xx.

SUPPLY VOLTAGE

The REF30xx family of references features an extremely low
dropout voltage. With the exception of the REF2912, which
has a minimum supply requirement of 1.8V, the REF29xx
can be operated with a supply of only 1mV above the output
voltage in an unloaded condition. For loaded conditions, a
typical dropout voltage versus load is shown on the cover
page.

0.47µF

1

2

REF29xx

3

Supply voltages below the specified levels can cause the
REF29xx to momentarily draw currents greater than the
typical quiescent current. Using a power supply with a fast
rising edge and low output impedance easily prevents this.

THERMAL HYSTERESIS

Thermal hysteresis for the REF29xx is defined as the change
in output voltage after operating the device at 25°C, cycling
the device through the specified temperature range, and
returning to 25°C, and can be expressed as:

Where: V



V

HYST

HYST =

V

PRE

absV V

=




Calculated hysteresis

= Output voltage measured at 25°C pre-

PRE

V

–

NOM

POST



6

10

ppm

•

(




)

temperature cycling
V

= Output voltage measured when device has

POST

been operated at 25°C, cycled through specified
range –40°C to +125°C and returned to operation at
25°C

TEMPERATURE DRIFT

The REF30xx is designed to exhibit minimal drift error, defined
as the change in output voltage over varying temperature.
Using the ‘box’ method of drift measurement, the REF29xx
features a typical drift coefficient of 20ppm from 0°C to 70°C—
the primary temperature range of use for many applications.
For industrial temperature ranges of –40°C to 125°C, the
REF30xx family drift increases to a typical value of 50ppm.

8

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REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

NOISE PERFORMANCE

The REF29xx generates noise less than 50µVp-p between
frequencies of 0.1Hz to 10Hz, and can be seen in the Typical
Characteristic Curve “0.1 to 10Hz Voltage Noise”. The noise
voltage of the REF29xx increases with output voltage and
operating temperature. Additional filtering may be used to
improve output noise levels, although care should be taken
to ensure the output impedance does not degrade AC
performance.

LONG TERM STABILITY

Long term stability refers to the change of the output voltage
of a reference over a period of months or years. This effect
lessens as time progresses as is apparent by the long term
stability curves. The typical drift value for the REF29xx is
24ppm from 0-1000 hours, and 15ppm from 1000-2000
hours. This parameter is characterized by measuring 30
units at regular intervals for a period of 2000 hours.

LOAD REGULATION

Load regulation is defined as the change in output voltage
due to changes in load current. Load regulation for the
REF29xx is measured using force and sense contacts as
pictured in Figure 4. The force and sense lines tied to the

contact area of the output pin reduce the impact of contact
and trace resistance, resulting in accurate measurement of
the load regulation contributed solely by the REF29xx. For
applications requiring improved load regulation, force and
sense lines should be used.

APPLICATION CIRCUITS
Negative Reference Voltage

For applications requiring a negative and positive reference
voltage, the OPA703 and REF29xx can be used to provide
a dual supply reference from a ±5V supply. Figure 5 shows
the REF2925 used to provide a ±2.5V supply reference
voltage. The low offset voltage and low drift of the OPA703
complement the low drift performance of the REF29xx to
provide an accurate solution for split-supply applications.

+5V

REF2925

10kΩ

10kΩ

+5V

+2.5V

Output Pin

Sense Line

+

V

OUT

–

Meter

I

L

Load

Contact and
Trace Resistance

Force Line

FIGURE 4. Accurate Load Regulation of REF29xx.

ADS7822

0.1µF

V

REF

V

OPA703

–5V

–2.5V

FIGURE 5. REF2925 Combined with OPA703 to Create

Positive and Negative Reference Voltages.

DATA ACQUISITION

Often data acquisition systems require stable voltage
references to maintain necessary accuracy. The REF29xx
family features stability and a wide range of voltages suitable
for most micro-controllers and data converters. See Figure 6
for a basic data acquisition system.

3.3V

5Ω

V

CC

+

1µF to 10µF

S

+

1µF to
10µF

REF2933

GND

V+

V

IN

+In

–In

GND

DCLOCK

FIGURE 6. Basic Data Acquisition System 1.

REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

CS

D

OUT

Microcontroller

9

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PACKAGE DRAWING

DBZ (R-PDSO-G3) PLASTIC SMALL-OUTLINE

3,04
2,80

2,05
1,78

1,03
0,89

0,51
0,37

0,60
0,45

1,40
1,20

2,64
2,10

1,12
0,89

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.
C. Dimensions are inclusive of plating.
D. Dimensions are exclusive of mold flash and metal burr.

0,100
0,013

0,55 REF

0,180
0,085

4203227/A 08/01

10

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REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033A

PACKAGE OPTION ADDENDUM

www.ti.com

3-Oct-2003

PACKAGING INFORMATION

ORDERABLE DEVICE STATUS(1) PACKAGE TYPE PACKAGE DRAWING PINS PACKAGE QTY

REF2912AIDBZR ACTIVE SOP DBZ 3 3000
REF2912AIDBZT ACTIVE SOP DBZ 3 250
REF2920AIDBZR ACTIVE SOP DBZ 3 3000
REF2920AIDBZT ACTIVE SOP DBZ 3 250
REF2925AIDBZR ACTIVE SOP DBZ 3 3000
REF2925AIDBZT ACTIVE SOP DBZ 3 250
REF2930AIDBZR ACTIVE SOP DBZ 3 3000
REF2930AIDBZT ACTIVE SOP DBZ 3 250
REF2933AIDBZR ACTIVE SOP DBZ 3 3000
REF2933AIDBZT ACTIVE SOP DBZ 3 250
REF2940AIDBZR ACTIVE SOP DBZ 3 3000
REF2940AIDBZT ACTIVE SOP DBZ 3 250

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.

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