SBOS471B April   2010  – June 2015 REF5020-EP , REF5025-EP , REF5040-EP , REF5050-EP

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics: Per Device
    6. 6.6 Electrical Characteristics: All Devices
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Output Adjustment Using The TRIM/NR Pin
      2. 7.3.2 Low Temperature Drift
      3. 7.3.3 Temperature Monitoring
      4. 7.3.4 Noise Performance
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Negative Reference Voltage
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Positive Reference Voltage
        1. 8.2.2.1 Detailed Design Procedure
          1. 8.2.2.1.1 Load Capacitance
          2. 8.2.2.1.2 Bandgap Noise Reduction
    3. 8.3 System Example
      1. 8.3.1 Data Acquisition
  9. 9 Power Supply Recommendations
    1. 9.1 Basic Connections
    2. 9.2 Low Dropout Voltage
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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9 Power Supply Recommendations

The maximum voltage drop between the input and output pin is 0.2 V. The minimum power supply voltage for the specific REF50xx device depends on the value of the output voltage, (VINMIN = VOUT + 0.2 V). The exception to this rule is the REF5020, which requires a minimum 2.7-V power supply for proper operation. The maximum power supply voltage for the REF50xx series is 18 V. TI recommends adding a bypass capacitor of 1 μF to 10 μF at the input to compensate for the layout and power supply source impedance.

9.1 Basic Connections

Figure 34 shows the typical connections for the REF50xx. TI recommends a supply bypass capacitor ranging from 1 μF to 10 μF. A 1-μF to 50-μF output capacitor (CL) must be connected from VOUT to GND. The ESR value of CL must be less than or equal to 1.5 Ω to ensure output stability. To minimize noise, the recommended ESR of CL is between 1 Ω and 1.5 Ω.

REF5020-EP REF5025-EP REF5040-EP REF5050-EP ai_basic_conn_bos410.gifFigure 34. Basic Connections

9.2 Low Dropout Voltage

The REF50xx family of voltage references features extremely low dropout voltage. With the exception of the REF5020, which has a minimum supply requirement of 2.7 V, these references can be operated with a supply of 200 mV above the output voltage in an unloaded condition. For loaded conditions, a typical dropout voltage versus load plot is shown in Figure 6 in Typical Characteristics.