SBOS913 February   2018 XTR305

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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: Voltage Output Mode
    6. 6.6  Electrical Characteristics: Current Output Mode
    7. 6.7  Electrical Characteristics: Operational Amplifier (OPA)
    8. 6.8  Electrical Characteristics: Instrumentation Amplifier (IA)
    9. 6.9  Electrical Characteristics: Current Monitor
    10. 6.10 Electrical Characteristics: Power and Digital
    11. 6.11 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Functional Features
      2. 7.3.2 Current Monitor
      3. 7.3.3 Error Flags
      4. 7.3.4 Power On/Off Glitch
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Voltage Output Mode
        2. 8.2.2.2  Current Output Mode
        3. 8.2.2.3  Input Signal Connection
        4. 8.2.2.4  Externally-Configured Mode: OPA and IA
        5. 8.2.2.5  Driver Output Disable
        6. 8.2.2.6  Driving Capacitive Loads and Loop Compensation
        7. 8.2.2.7  Internal Current Sources, Switching Noise, and Settling Time
        8. 8.2.2.8  IA Structure, Voltage Monitor
        9. 8.2.2.9  Digital I/O and Ground Considerations
        10. 8.2.2.10 Output Protection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 VQFN Package and Heat Sinking
    4. 10.4 Power Dissipation
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.2.5 Driver Output Disable

The OPA output (DRV) can be switched to a high-impedance mode by driving the OD control pin low. This input can be connected to the overtemperature flag, EFOT, and a pullup resistor to protect the IC from over-temperature by disconnecting the load.

The output disable mode can be used to sense and measure the voltage at the IA input pins without loading from the DRV output. This mode allows testing of any voltage present at the I/O connector. However, consider the bias current of the IA input pins.

The digital control inputs, M1 and M2, set the four operation modes of the XTR305 as shown in Table 1. When M1 is asserted low, M2 determines voltage or current mode and the corresponding appropriate current limit (ISC) setting. When M1 is high, the internal feedback connections are opened; IAOUT and IMON are both connected to the output pins; and M2 only determines the current limit (ISC) setting.

M1 and M2 are pulled low internally with 1 μA. Terminate these two pins to avoid noise coupling. Output disable (OD) is internally pulled high with approximately 1 μA. When connecting OD to EFOT, a 2.2-kΩ pullup resistor is recommended.

Table 1. Summary of Configuration Modes(1)

M1M2MODEDESCRIPTION
L L VOUT Voltage output mode, ISC = 20 mA
L H IOUT Current output mode, ISC = 32 mA
H L Ext IA and IMON on external pins, ISC = 20 A
H H Ext IA and IMON on external pins, ISC = 32 mA
(1) OD is a control pin independent of M1 or M2.