SBVS033C June   2002  – June 2016 REF2912 , REF2920 , REF2925 , REF2930 , REF2933 , REF2940

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Supply Voltage
      2. 8.3.2 Thermal Hysteresis
      3. 8.3.3 Temperature Drift
      4. 8.3.4 Noise Performance
      5. 8.3.5 Long-Term Stability
      6. 8.3.6 Load Regulation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Negative Reference Voltage
      2. 8.4.2 Data Acquisition
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Supply voltage, V+ to V– 7 V
Output short circuit(2) Continuous °C
Lead temperature (soldering, 10 s) 300 °C
Operating temperature –40 125 °C
Junction temperature 150 °C
Storage temperature, Tstg –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Short-circuit to ground.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±4000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
VIN Input voltage VREF + 0.05(1) 5.5 V
ILOAD Load current 25 mA
TA Operating temperature –40 125 °C
(1) Minimum supply voltage for the REF2912 is 1.8 V.

7.4 Thermal Information

THERMAL METRIC(1) REF29xx UNIT
DBZ (SOT-23)
3 PINS
RθJA Junction-to-ambient thermal resistance 297.3 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 128.5 °C/W
RθJB Junction-to-board thermal resistance 91.7 °C/W
ψJT Junction-to-top characterization parameter 12.8 °C/W
ψJB Junction-to-board characterization parameter 90.3 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance N/A °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

7.5 Electrical Characteristics

Boldface limits apply over the specified temperature range, TA = –40°C to 125°C. At TA = 25°C, ILOAD = 0 mA, VIN = 5 V, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
REF2912 – 1.25 V
VOUT Output voltage 1.225 1.25 1.275 V
Initial accuracy 2%
Output voltage noise f = 0.1 Hz to 10 Hz, 14 µVPP
Voltage noise f = 10 Hz to 10 kHz 42 µVrms
Line regulation 1.8 V ≤ VIN ≤ 5.5 V 60 190 µV/V
REF2920
VOUT Output voltage 2.007 2.048 2.089 V
Initial accuracy 2%
Output voltage noise f = 0.1 Hz to 10 Hz, 23 µVPP
Voltage noise f = 10 Hz to 10 kHz 65 µVrms
Line regulation VREF + 50 mV ≤ VIN ≤ 5.5 V 110 290 µV/V
REF2925
VOUT Output voltage 2.45 2.5 2.55 V
Initial accuracy 2%
Output voltage noise f = 0.1 Hz to 10 Hz 28 µVPP
Voltage noise f = 10 Hz to 10 kHz 80 µVrms
Line regulation VREF + 50 mV ≤ VIN ≤ 5.5 V 120 325 µV/V
REF2930
VOUT Output voltage 2.94 3 3.06 V
Initial accuracy 2%
Output voltage noise f = 0.1 Hz to 10 Hz, 33 µVPP
Voltage noise f = 10 Hz to 10 kHz 94 µVrms
Line regulation VREF + 50 mV ≤ VIN ≤ 5.5 V 120 375 µV/V
REF2933
VOUT Output voltage 3.234 3.3 3.366 V
Initial accuracy 2%
Output voltage noise f = 0.1 Hz to 10 Hz, 36 µVPP
Voltage noise f = 10 Hz to 10 kHz 105 µVrms
Line regulation VREF + 50 mV ≤ VIN ≤ 5.5 V 130 400 µV/V
REF2940
VOUT Output voltage 4.014 4.096 4.178 V
Initial accuracy 2%
Output voltage noise f = 0.1 Hz to 10 Hz, 45 µVPP
Voltage noise f = 10 Hz to 10 kHz 128 µVrms
VREF + 50 mV ≤ VIN ≤ 5.5 V 160 410 µV/V
REF2912, REF2920, REF2925, REF2930, REF2933, REF2940
dVOUT/dT Output voltage temperature drift(2) –40°C ≤ TA ≤ 125°C 35 100 ppm/°C
ILOAD Output current 25 mA
Long-term stability 0 to 1000H 24 ppm
1000 to 2000H 15
dVOUT/dILOAD Load regulation(3) 0 mA < ILOAD < 25 mA,
VIN = VREF + 500 mV(1)		 3 100 µV/mA
dT Thermal Hysteresis(4) 25 100 ppm
VIN – VOUT Dropout voltage 1 50 mV
ISC Short-circuit current 45 mA
Turnon settling time to 0.1% at VIN = 5 V with CL = 0 120 µs
POWER SUPPLY
VS Voltage IL = 0 VREF + 0.001(5) 5.5 V
Voltage over temperature –40°C ≤ TA ≤ 125°C VREF + 0.05 5.5
IQ Quiescent current 42 50 µA
Quiescent current over temperature –40°C ≤ TA ≤ 125°C 59
TEMPERATURE RANGE
Specified range –40 125 °C
Operating range –40 125 °C
Storage range –65 150 °C
RθJC Thermal resistance for SOT-23 surface-mount 110 °C/W
RθJA 336 °C/W
(1) Minimum supply voltage for REF2912 is 1.8 V.
(2) Box Method used to determine overtemperature drift.
(3) Typical value of load regulation reflects measurements using a force and sense contacts, see Load Regulation.
(4) Thermal hysteresis procedure is explained in more detail in Thermal Hysteresis.
(5) For IL > 0, see Typical Characteristics.

7.6 Typical Characteristics

REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_02_SBVS033C.gif
Figure 1. Temperature Drift (0°C to 70°C)
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_04_SBVS033C.gif
Figure 3. Output Voltage vs Temperature
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_06_SBVS033C.gif
Figure 5. Load Regulation vs Temperature
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_08_SBVS033C.gif
Figure 7. Line Regulation vs Temperature
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_10_SBVS033C.gif
Figure 9. Power-Supply Rejection Ratio vs Frequency
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_12_SBVS033C.gif
Figure 11. Output Voltage vs Supply Voltage (ILOAD = 25 mA)
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_14_SBVS033C.gif
Figure 13. Step Response, CL = 0, 3-V Start-Up
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_16_SBVS033C.gif
Figure 15. Line Transient Response
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_18_SBVS033C.gif
Figure 17. 0 to 5-mA Load Transient (CL = 0)
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_20_SBVS033C.gif
Figure 19. 1 to 25-mA Load Transient (CL = 1 µF)
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_22_SBVS033C.gif
Figure 21. Long-Term Stability 0 to 1000 Hours
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_24_SBVS033C.gif
Figure 23. Long-Term Stability 0 to 2000 Hours
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_03_SBVS033C.gif
Figure 2. Temperature Drift (–40°C to 125°C)
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_05_SBVS033C.gif
Figure 4. Maximum Load Current vs Temperature
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_07_SBVS033C.gif
Figure 6. Quiescent Current vs Temperature
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_09_SBVS033C.gif
Figure 8. Output Impedance vs Frequency
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_11_SBVS033C.gif
Figure 10. Output Voltage vs Supply Voltage (No Load)
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_13_SBVS033C.gif
Figure 12. Output Voltage vs Load Current
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_15_SBVS033C.gif
Figure 14. Step Response, CL = 0, 5-V Start-Up
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_17_SBVS033C.gif
Figure 16. 0 to 1-mA Load Transient (CL = 0)
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_19_SBVS033C.gif
Figure 18. 1 to 6-mA Load Transient (CL = 1 µF)
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_21_SBVS033C.gif
Figure 20. 0.1 to 10-Hz Noise
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 Graph_23_SBVS033C.gif
Figure 22. Long-Term Stability 1000 to 2000 Hours