SNVS234C September   2004  – September 2016 LM5112 , LM5112-Q1

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
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Inverting Mode
      2. 7.4.2 Non-Inverting Mode
  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
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Thermal Considerations
        1. 10.1.1.1 Drive Power Requirement Calculations In LM5112
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Links
    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

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • NGG|6
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9 Power Supply Recommendations

The recommended bias supply voltage range for LM5112 is from 3.5 V to 14 V. The lower end of this range is governed by the internal UVLO protection feature of the VCC supply circuit. The upper end of this range is driven by the 14 V maximum recommended operating voltage rating of the VCC supply. It is recommended to keep proper margin to allow for transient voltage spikes. The dedicated input ground pin (IN_REF) allows split output supply operation. For such applications, ensure VEE is not connected to IN_REF.

The UVLO protection feature also involves a hysteresis function. This means that once the device is operating in normal mode, if the VCC voltage drops, the device continues to operate in normal mode as long as the voltage drop does not exceed the hysteresis specification, VCCH. If the voltage drop is greater than the hysteresis specification, the device shuts down. Therefore, while operating at or near the 3.5 V range, the voltage ripple on the auxiliary power supply output must be smaller than the hysteresis specification of LM5112 to avoid triggering device-shutdown.

A low-ESR or low-ESL capacitor must be connected close to the IC and between the VCC and VEE pins to support high peak currents being drawn from VCC during turnon of the MOSFET. Also, if input pin (IN or INB) is not being used, it must be connected to VCC or IN_REF, respectively, to avoid spurious output signals.