SLVSHP0 July   2024 TLVM14404 , TLVM14406

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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 System Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Input Voltage Range (VIN1, VIN2)
      2. 7.3.2  Enable EN Pin and Use as VIN UVLO
      3. 7.3.3  CONFIG Device Configuration Pin
      4. 7.3.4  Adjustable Switching Frequency
      5. 7.3.5  Adjustable Output Voltage (FB)
      6. 7.3.6  Input Capacitors
      7. 7.3.7  Output Capacitors
      8. 7.3.8  Power-Good Output Voltage Monitoring
      9. 7.3.9  Bias Supply Regulator (VCC, VOSNS)
      10. 7.3.10 Overcurrent Protection (OCP)
      11. 7.3.11 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
  9. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Design 1 – High-efficiency, Dual Output 5V at 3A, 3.3V at 3A, Synchronous Buck Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Output Voltage Setpoint
          3. 8.2.1.2.3 Switching Frequency Selection
          4. 8.2.1.2.4 Input Capacitor Selection
          5. 8.2.1.2.5 Output Capacitor Selection
          6. 8.2.1.2.6 Other Considerations
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2 – High-efficiency, 6A, Synchronous Buck Regulator for Industrial Applications
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Output Voltage Setpoint
          2. 8.2.2.2.2 Switching Frequency Selection
          3. 8.2.2.2.3 Input Capacitor Selection
          4. 8.2.2.2.4 Output Capacitor Selection
          5. 8.2.2.2.5 Other Connections
        3. 8.2.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Thermal Design and Layout
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.8 Power-Good Output Voltage Monitoring

While the PG1/PG2 of the TLVM1440x resembles a standard power-good function, the functionality is designed to replace a discrete reset IC, reducing BOM cost. There are three major differences between the PG function and the normal power-good function seen in most regulators:

  • A delay has been added for release of reset. See Table 7-7.
  • PG output signals a fault (pulls the output to ground) while the part is disabled.
  • PG continues to operate with input voltage as low as 1.2V. Below this input voltage, PG output can be high impedance.

For dual output configuration (RCONFIG = 0 or 121kΩ), The PG1 is an open-drain and must be tied through a resistor to an external voltage, and pulls low if the monitors on FB1 or VOSNS1 trip. The PG2 flag is configured in the same manner as PG1 and monitors the second output at either FB2 or VOSNS2.

For single-output operation (RCONFIG = 9.53kΩ), PG2 is no long active and the PG2/NC terminal of the primary device can be left floating.

TLVM14404 TLVM14406 PG Static Voltage ThresholdsFigure 7-5 PG Static Voltage Thresholds
TLVM14404 TLVM14406 PG Timing Diagram (Excludes OV Events)Figure 7-6 PG Timing Diagram (Excludes OV Events)
Table 7-7 Conditions that Cause PG to Signal a Fault (Pull Low)
FAULT CONDITION INITIATEDFAULT CONDITION ENDS (AFTER WHICH tRESET_ACT MUST PASS BEFORE RESET OUTPUT IS RELEASED)
FB below VRESET_UV for longer than tRESET_FILTERFB above VRESET_UV + VRESET_HYST for longer than tRESET_FILTER
FB above VRESET_OV for longer than tRESET_FILTERFB below VRESET_OV – VRESET_HYST for longer than tRESET_FILTER
Junction temperature exceeds TSD_RJunction temperature falls below TSD_F(1)
EN lowtEN passes after EN becomes high(1)
VIN falls low enough so that VCC falls below VCC_UVLO - VCC_UVLO_HYST. This value is called VIN_OPERATE.Voltage on VIN is high enough so that VCC pin exceed VCC_UVLO(1)
(1) As an additional operational check, PG remains low during soft start. Soft start is defined as until the lesser of either full output voltage reached or tSS2 has passed since initiation. This definition is true even if all other conditions in this table are met and tRESET_ACT has passed. Lockout during soft start does not require tRESET_ACT to pass before PG is released.

The threshold voltage for the PG function is specified to take advantage of the availability of the internal feedback threshold to the PG circuit. This allows a maximum threshold of 96.5% of selected output voltage to be specified at the same time as 96% of actual operating point. The net result is a more accurate reset function while expanding the system allowance for transient response. See the output voltage error stack-up comparison in Figure 7-7.

In addition to signaling a fault upon overvoltage detection (FB above VRESET_OV), the switch node is shut down and a small, approximately 1mA pulldown is applied to the SW node.

TLVM14404 TLVM14406 Reset Threshold Voltage Stack-upFigure 7-7 Reset Threshold Voltage Stack-up

The PG signal can be used for start-up sequencing of downstream regulators, as shown in the following figure, or for fault protection and output monitoring.

TLVM14404 TLVM14406 TLVM1440x Sequencing Implementation Using PG and EN| Figure 7-8 TLVM1440x Sequencing Implementation Using PG and EN|