REF3033TB-GT3 - ON Semiconductor L.L.C.

April, 2011 − Rev. 0

1Publication Order Number:

REF3012/D

REF3012, REF3020,

REF3025, REF3030,

REF3033, REF3040

High Precision, Low Drift,

CMOS Voltage Reference

The REF30xx family of voltage references provides accurate

voltage regulation with a maximum temperature drift of 50 ppm/°C.

The REF30xx can source or sink up to 10 mA of load current. It is

supplied in a space−saving SOT−23 package, and for most

applications can forgo the use of an output bypass capacitor.

Features

•Reference Voltages:

1.25 V, 2.048 V, 2.5 V, 3.0 V, 3.3 V, 4.096 V

•High Accuracy: ±0.2%

•Low Quiescent Current: 30 mA max

•High Output Current: 10 mA Sourced or Sunk

•Maximum 50 ppm/°C Temperature Drift over the Specified Range of

−40°C to +85°C

•SOT−23 3−Lead Package

•This Device is Pb−Free, Halogen Free/BFR Free, and RoHS

Compliant

Typical Applications

•Battery Powered Systems

•A/D and D/A Converters

•Precision Regulator Systems

•Power Supplies

•Portable Medical Equipment

GND

REF30xx

0.1 mF

VIN VIN VOUT

VOUT

Figure 1. Application Circuit

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PIN CONNECTIONS

GND

VIN

(Top View)

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

ORDERING INFORMATION

SOT23−3

TB SUFFIX

CASE 527AG

S3 = Specific Device Code

Y = Production Year

= (Last Digit)

M = Production Month

= (1 − 9, O, N, D)

MARKING DIAGRAM

S3YM

VOUT

PIN FUNCTIONS

Pin Name

VIN

Function

Supply Voltage Input

VOUT Output Voltage

GND Ground

Pin No.

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

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Table 1. ORDERING INFORMATION

Device Output Voltage Marking Package Shipping †

REF3012TB−GT3 1.25 V

S3YM SOT−23 3000 / Tape & Reel

REF3020TB−GT3 2.048 V

REF3025TB−GT3 2.5 V

REF3030TB−GT3 3.0 V

REF3033TB−GT3 3.3 V

REF3040TB−GT3 (Note 1) 4.096 V

1. Contact factory for availability of these and other custom voltages.

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

Table 2. ABSOLUTE MAXIMUM RATINGS (Note 2)

Rating Value Unit

VIN 6.5 V

Storage Temperature Range −55 to +125 _C

Junction Temperature Range +150 _C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

2. Maximum terminal current is bounded by the maximum current handling of the switches, maximum power dissipation of the package.

Table 3. RECOMMENDED OPERATING CONDITIONS

Rating Value Unit

Temperature Range −40 to +85 _C

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

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Table 4. ELECTRICAL CHARACTERISTICS

(VIN = 3.0 V, IOUT = 0 mA, COUT = 0.001 mF, −40°C to +85°C unless specified otherwise.)

Parameter Test Conditions Symbol Min Typ Max Unit

Output Voltage REF3012

REF3020

REF3025

REF3030 (VIN = 5.0 V)

REF3033 (VIN = 5.0 V)

REF3040 (VIN = 5.0 V)

Vout 1.2475

2.044

2.495

2.994

3.294

4.088

1.250

2.048

2.500

3.000

3.300

4.096

1.2525

2.052

2.505

3.006

3.306

4.104

Output Voltage Accuracy −0.2 +0.2 %

Output Voltage Noise (Note 3) f = 0.1 Hz to 10 Hz 50 mVp−p

Line Regulation 2.7 V ≤ VIN ≤ 5.5 V 30 100 mV/V

Output voltage temp Drift −40°C ≤ TA ≤ +85°C dVOUT/dT 20 50 ppm/°C

Long−Term Stability (Note 3) 0−1000 h 50 ppm

Load Regulation VIN = 3 V

0 mA < ILOAD < 10 mA

−10 mA < ILOAD < 0 mA

dVOUT/

dILOAD 100

150

250

350

mV/mA

Thermal Hysteresis (Note 3) ΔTA = 125°C dT 100 ppm

Dropout Voltage VOUT = 2.5 V VIN − VOUT 1 2.5 mV

Short−Circuit Current (Note 3) TA = 25°C

OUT pin shorted to GND

OUT pin shorted to IN

ISC

Turn On Settling Time To 0.1% at VIN = 5 V with CL = 0 2 ms

Power Supply Voltage IL = 0 VS2.7 5.5 V

Supply Current IL = 0 IQ30 mA

Temperature Range

Specified Range

Operating Range

Storage Range

−40

−55

+85

+125

°C

3. Guaranteed by design.

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

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TYPICAL CHARACTERISTICS

Unit 3

Figure 2. Output Voltage vs. Temperature Figure 3. Output Voltage vs. Supply Voltage

(No Load)

TEMPERATURE (°C)

85603510−15−40

1.2492

1.2494

1.2496

1.2498

1.2502

1.2504

1.2506

1.2508

Figure 4. Line Regulation over Temperature Figure 5. Load Regulation over Temperature

OUTPUT VOLTAGE (V)

Unit 1

Unit 2

1.2500

INPUT VOLTAGE (V)

5.54.54.03.53.02.5

1.2498

1.2499

1.2500

1.2501

1.2502

OUTPUT VOLTAGE (V)

Unit 3

Unit 1

Unit 2

5.0

INPUT VOLTAGE (V)

5.55.04.54.03.53.02.5

−25

OUTPUT VOLTAGE CHANGE (mV)

+85°C

+25°C

−40°C

OUTPUT CURRENT (mA)

1050−5−10

−1.5

−1.0

−0.5

0.5

1.0

1.5

2.0

OUTPUT VOLTAGE CHANGE (mV)

+85°C

+25°C

−40°C

SINKING SOURCING

Figure 6. Power−Supply Rejection Ratio vs.

Frequency

FREQUENCY (Hz)

100 k10 k1 k100101

−90

−80

−70

−50

−40

−30

−10

PSRR (dB)

−60

−20

No Load

1 nF Load

10 nF Load

100 nF Load

1 M

Figure 7. Output Impedance vs. Frequency

FREQUENCY (Hz)

100 k10 k1 k100101

100

120

160

OUTPUT IMPEDANCE (W)

140

No Load

1 nF Load

10 nF Load

100 nF Load

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

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TYPICAL CHARACTERISTICS

Figure 8. Step Response, CL = 0, 3 V Startup Figure 9. 0.1 Hz to 10 Hz Noise

Figure 10. Line Transient Response Figure 11. Line Transient Response

with Cap. Load

Figure 12. Load Transient (IL = 50 mA) Figure 13. Load Transient (IL = 10 mA)

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

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APPLICATION INFORMATION

Application Information

A supply bypass capacitor of 0.1 mF is recommended.

In most applications, the REF30xx does not require an

output bypass capacitor. For the effects of a capacitive load

on device performance, see Figures 8 and 9 in the Typical

Characteristics section.

Power Supply

The REF30xx family of references works at supply

voltages between 2.7 V and 5.5 V. The maximum dropout

voltage in this range is 2.5 mV.

While the power supply voltage rises to the specified level

during power−up, the REF30xx will temporarily draw a

higher than typical current. It is recommended to use a

power supply with a fast rising edge.

Line Regulation

Line regulation is defined as the change in output voltage

due to the change in the input voltage. For REF30xx, this

change is less than 100 mV/V across the specified supply

voltage range.

Thermal Hysteresis

Thermal hysteresis is defined as the change in the output

voltage after the device is cycled through the operating

temperature range. This change is reported as a fraction of

the nominal output voltage, in ppm. The initial output VPRE

is measured at 25°C. After the device is cooled to −40°C,

heated to +80°C, then cooled back to 25°C, the final output

voltage VPOST is measured. The thermal hysteresis is equal

ThHYST +

ŤVPRE *VPOSTŤ

VNOM

@106(ppm) (eq. 1)

where VNOM is the nominal output voltage.

Temperature Drift

Temperature drift is defined as the change in the output

voltage caused by a change in operating temperature. (See

Figure 2 in the Typical Characteristics section.) The

REF30xx family is designed to exhibit a temperature drift of

less than 50 ppm/°C across its entire operating temperature

range of −40°C to +85°C.

Noise Performance

The noise generated by the REF30xx family is typically

less than 50 mVp−p between frequencies of 0.1 Hz to 10 Hz,

as shown in the Typical Characteristic Curves. Output noise

can be additionally reduced using a low−pass filter, although

care should be taken, as capacitive loads affect the PSRR and

the output impedance. (See the Typical Characteristics

section.)

Load Regulation

Load regulation is defined as the change in output voltage

due to a specified change in load current. The REF30xx

family can sink or source up to 10 mA of current, with an

output change of less than 250 mV/mA when sourcing, or

350 mV/mA when sinking current.

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

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Figure 14. Adjustable Voltage Reference

SDA

SCL

VCC

+5 V

Vout

GND

CAT5171

Vin

REF3040

+5 V

SDA

SCL

0.1 mF

Figure 15. Data Acquisition System using REF30xx Voltage Reference, with Noise Filter

GND

0.1 mF

+5 V

Vout

Vin

REF30xx 10 W

0.01 mF

+5 V

Vin

serial bus

VREF

+5 V

VCC

ADC

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

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PACKAGE DIMENSIONS

SOT−23, 3 Lead

CASE 527AG−01

ISSUE O

E1 E

TOP VIEW

SIDE VIEW END VIEW

L1 L

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC TO-236.

SYMBOL MIN NOM MAX

0°8°

0.013

0.37

0.085

2.80

2.10

1.20

1.90 BSC

0.40 REF

1.12

0.10

0.50

0.18

3.04

2.64

1.40

0.54 REF

0.95 BSC

0.89

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice

to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

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REF3012/D

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