Texas Instruments REF2912, REF2920, REF2925, REF2930, REF2933 Schematic [ru]

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REF2912
REF2920
REF2925
REF2930
REF2933
REF2940

SBVS033B – JUNE 2002 – REVISED FEBRUARY 2008

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 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.

All trademarks are the property of their respective owners.

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.

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100

Dropout Voltage (mV)

50

0

0 5 10 15 20 25 30

Load Current (mA)

Copyright © 2002-2008, 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

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

(1)

PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT

(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 package and ordering information, see the Package Option Addendum at the end of this data sheet, or see the TI 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 14 µV
Voltage Noise f = 10Hz to 10kHz 42 µVrms

LINE REGULATION 1.8V ≤ VIN ≤ 5.5V 60 190 µV/V

OUTPUT VOLTAGE V

Initial Accuracy 2%

NOISE

Output Voltage Noise f = 0.1Hz to 10Hz 23 µV
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 28 µV
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

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

PP

PP

PP

2

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REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033B

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 33 µV
Voltage Noise f = 10Hz to 10kHz 94 µVrms

LINE REGULATION V

OUTPUT VOLTAGE V

Initial Accuracy 2%

NOISE

Output Voltage Noise f = 0.1Hz to 10Hz 36 µV
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 µV
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

PP

PP

PP

REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033B

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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

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REF2912, 2920, 2925, 2930, 2933, 2940

SBVS033B

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

SBVS033B

vs SUPPLY VOLTAGE (I

Supply (V)

LOAD

= 25mA)

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5