REF2912
REF2920
REF2925
REF2930
REF2933
REF2940
SBVS033A – JUNE 2002 – REVISED MARCH 2003
100ppm/
°
C, 50
µ
A in SOT23-3
CMOS VOLTAGE REFERENCE
FEATURES
q
MicroSIZE
PACKAGE: SOT23-3
q
LOW DROPOUT: 1mV
q
HIGH OUTPUT CURRENT: 25mA
q
LOW TEMPERATURE DRIFT: 100ppm/
°
C max
q
HIGH ACCURACY: 2%
q
LOW I
Q
: 50
µ
A max
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
REF2912
REF2920
REF2925
REF2930
REF2933
REF2940
VOLTAGE (V)
1.25
2.048
2.5
3.0
3.3
4.096
APPLICATIONS
q
PORTABLE, BATTERY-POWERED EQUIPMENT
q
DATA ACQUISITION SYSTEMS
q
MEDICAL EQUIPMENT
q
HAND-HELD TEST EQUIPMENT
DROPOUT VOLTAGE vs LOAD CURRENT
IN
1
Dropout Voltage (mV)
OUT
2
REF2912
REF2920
REF2925
REF2930
REF2933
REF2940
SOT23-3
350
3
GND
300
250
200
150
100
50
0
0
5
10
15
20
25
30
Load Current (mA)
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.
Copyright © 2002-2003, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage, V+ to V– ................................................................... 7.0V
Output Short-Circuit
(2)
.............................................................. Continuous
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.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments 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 degrada-
tion 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
PACKAGE
DESIGNATOR
(1)
DBZ
SPECIFIED
TEMPERATURE
RANGE
–40°C to +125°C
PACKAGE
MARKING
R29A
ORDERING
NUMBER
REF2912AIDBZT
REF2912AIDBZR
REF2920AIDBZT
REF2920AIDBZR
REF2925AIDBZT
REF2925AIDBZR
REF2930AIDBZT
REF2930AIDBZR
REF2933AIDBZT
REF2933AIDBZR
REF2940AIDBZT
REF2940AIDBZR
TRANSPORT
MEDIA, QUANTITY
Tape and Reel, 250
Tape and Reel, 3000
Tape and Reel, 250
Tape and Reel, 3000
Tape and Reel, 250
Tape and Reel, 3000
Tape and Reel, 250
Tape and Reel, 3000
Tape and Reel, 250
Tape and Reel, 3000
Tape and Reel, 250
Tape and Reel, 3000
PRODUCT
REF2912
PACKAGE-LEAD
SO T23-3
"
REF2920
"
SOT23-3
"
DBZ
"
–40°C to +125°C
"
R29B
"
REF2925
"
SOT23-3
"
DBZ
"
–40°C to +125°C
"
R29C
"
REF2930
"
SOT23-3
"
DBZ
"
–40°C to +125°C
"
R29D
"
REF2933
"
SOT23-3
"
DBZ
"
–40°C to +125°C
"
R29E
"
REF2940
"
SOT23-3
"
DBZ
"
–40°C to +125°C
"
R29F
"
"
"
"
"
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,
T
A
= –40
°
C to +125
°
C.
At T
A
= +25°C, I
LOAD
= 0mA, V
IN
= 5V, unless otherwise noted.
REF29xx
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
REF2912-1.25V
OUTPUT VOLTAGE
Initial Accuracy
NOISE
Output Voltage Noise
Voltage Noise
LINE REGULATION
V
OUT
1.225
1.25
1.275
2
V
%
µVp-p
µVrms
190
µV/V
f = 0.1Hz to 10Hz
f = 10Hz to 10kHz
1.8V
≤
V
IN
≤
5.5V
20
42
60
REF2920
OUTPUT VOLTAGE
Initial Accuracy
NOISE
Output Voltage Noise
Voltage Noise
LINE REGULATION
V
OUT
2.007
2.048
2.089
2
V
%
µVp-p
µVrms
290
µV/V
f = 0.1Hz to 10Hz
f = 10Hz to 10kHz
V
REF
+ 50mV
≤
V
IN
≤
5.5V
28
65
110
REF2925
OUTPUT VOLTAGE
Initial Accuracy
NOISE
Output Voltage Noise
Voltage Noise
LINE REGULATION
V
OUT
2.450
2.50
2.550
2
V
%
µVp-p
µVrms
325
µV/V
f = 0.1Hz to 10Hz
f = 10Hz to 10kHz
V
REF
+ 50mV
≤
V
IN
≤
5.5V
35
80
120
2
REF2912, 2920, 2925, 2930, 2933, 2940
www.ti.com
SBVS033A
ELECTRICAL CHARACTERISTICS
(Cont.)
Boldface
limits apply over the specified temperature range,
T
A
= –40
°
C to +125
°
C.
At T
A
= +25°C, I
LOAD
= 0mA, V
IN
= 5V, unless otherwise noted.
REF29xx
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
REF2930
OUTPUT VOLTAGE
Initial Accuracy
NOISE
Output Voltage Noise
Voltage Noise
LINE REGULATION
V
OUT
2.940
3.0
3.06
2
V
%
µVp-p
µVrms
120
375
µV/V
f = 0.1Hz to 10Hz
f = 10Hz to 10kHz
V
REF
+ 50mV
≤
V
IN
≤
5.5V
REF2933
OUTPUT VOLTAGE
Initial Accuracy
NOISE
Output Voltage Noise
Voltage Noise
LINE REGULATION
V
OUT
3.234
3.30
3.366
2
V
%
µVp-p
µVrms
400
µV/V
f = 0.1Hz to 10Hz
f = 10Hz to 10kHz
V
REF
+ 50mV
≤
V
IN
≤
5.5V
41
105
130
REF2940
OUTPUT VOLTAGE
Initial Accuracy
NOISE
Output Voltage Noise
Voltage Noise
LINE REGULATION
V
OUT
4.014
4.096
4.178
2
V
%
µVp-p
µVrms
410
µV/V
f = 0.1Hz to 10Hz
f = 10Hz to 10kHz
V
REF
+ 50mV
≤
V
IN
≤
5.5V
45
128
160
REF2912, REF2920, REF2925, REF2930, REF2933, REF2940
OUTPUT VOLTAGE TEMP DRIFT
(2)
OUTPUT CURRENT
LONG-TERM STABILITY
0-1000
H
1000-2000
H
LOAD REGULATION
(3)
THERMAL HYSTERESIS
(4)
DROPOUT VOLTAGE
SHORT-CIRCUIT CURRENT
TURN-ON SETTLING TIME
POWER SUPPLY
Voltage
Over Temperature
Quiescent Current
Over Temperature
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
SOT23-3 Surface-Mount
V
S
I
Q
dV
OUT
/dI
LOAD
dT
V
IN
– V
OUT
I
SC
to 0.1% at V
IN
= 5V with C
L
= 0
I
L
= 0
–40
°
C
≤
T
A
≤
+125
°
C
–40
°
C
≤
T
A
≤
+125
°
C
–40
–40
–65
V
REF
+ 0.001
(5)
V
REF
+ 0.05
42
0mA < I
LOAD
< 25mA,
V
IN
= V
REF
+ 500mV
(1)
24
15
3
25
1
45
120
5.5
5.5
50
59
+125
+125
+150
110
336
100
100
50
ppm
ppm
µV/mA
ppm
mV
mA
µs
V
V
µA
µ
A
°C
°C
°C
°C/W
°C/W
dV
OUT
/dT
I
LOAD
–40
°
C
≤
T
A
≤
+125
°
C
35
100
25
ppm/
°
C
mA
θ
JC
θ
JA
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
L
> 0, see Typical Characteristic curves.
REF2912, 2920, 2925, 2930, 2933, 2940
SBVS033A
3
www.ti.com
TYPICAL CHARACTERISTICS
At T
A
= +25°C, V
IN
= +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted.
TEMPERATURE DRIFT (0°C to +70°C)
50
45
40
100
90
80
TEMPERATURE DRIFT (–40°C to +125°C)
Number of Units
Number of Units
35
30
25
20
15
10
5
0
5
10 15 20 25 30 35 40 45 50 55 60 65
Drift (ppm/°C)
70
60
50
40
30
20
10
0
5
10 15 20 25 30 35 40 45 50 55 60 65
Drift (ppm/°C)
OUTPUT VOLTAGE vs TEMPERATURE
2.502
Maximum Load Current (mA)
MAXIMUM LOAD CURRENT vs TEMPERATURE
35
30
25
20
15
10
5
2.500
Output Voltage (V)
2.498
2.496
2.494
2.492
2.490
–40
–20
0
20
40
60
80
100
120
140
Temperature (°C)
–40
–20
0
20
40
60
80
100
120
140
Temperature (°C)
LOAD REGULATION vs TEMPERATURE
6
5
4
3
2
1
0
–40
–20
0
20
40
60
80
100
120
140
Temperature (°C)
60
50
40
QUIESCENT CURRENT vs TEMPERATURE
Load Regulation (µV/mA)
I
Q
(µA)
30
20
10
0
–40
–20
0
20
40
60
80
100
120
140
Temperature (°C)
4
REF2912, 2920, 2925, 2930, 2933, 2940
www.ti.com
SBVS033A
TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25°C, V
IN
= +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted.
LINE REGULATION vs TEMPERATURE
200
100
OUTPUT IMPEDANCE vs FREQUENCY
Output Impedance (dB)
Line Regulation (µV/V)
150
10
100
1
50
0
0.1
–50
–40
–20
0
20
40
60
80
100
120
140
Temperature (°C)
0.01
1
10
100
1k
10k
100k
Frequency (Hz)
POWER-SUPPLY REJECTION RATIO vs FREQUENCY
90
80
70
60
PSRR (dB)
50
40
30
20
10
0
1
10
100
1k
10k
100k
Frequency (Hz)
OUTPUT VOLTAGE vs SUPPLY VOLTAGE (No Load)
2.50138
2.50000
2.49862
Output Voltage (V)
2.49724
2.49586
2.49448
2.49310
2.49172
2.49034
2.48896
2.5
3
3.5
4
4.5
5
5.5
6
Supply (V)
OUTPUT VOLTAGE
vs SUPPLY VOLTAGE (I
LOAD
= 25mA)
2.5008
2.5000
2.4992
2.50152
2.50000
OUTPUT VOLTAGE vs LOAD CURRENT
Output Voltage (V)
2.4984
2.4976
2.4968
2.4967
2.4952
2.4944
2.4936
2.5
3
3.5
4
4.5
5
5.5
6
Supply (V)
Output Voltage (V)
2.49848
2.49696
2.49544
2.49392
2.49824
2.49088
2.48936
0
5
10
15
20
25
30
Load Current (mA)
REF2912, 2920, 2925, 2930, 2933, 2940
SBVS033A
5
www.ti.com
