SLVSI74A July   2025  – November 2025 TLV61290

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 I2C Interface Timing Characteristics
    8. 6.8 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 Output Voltage Setting
      2. 7.3.2 Switching frequency and Spread Spectrum Function
    4. 7.4 Device Functional Modes
      1. 7.4.1  Enable and Start-up
      2. 7.4.2  Operation Mode Setting
      3. 7.4.3  Bypass Mode
      4. 7.4.4  Boost Control Operation
      5. 7.4.5  Auto PFM Mode
      6. 7.4.6  Forced PWM Mode
      7. 7.4.7  Ultrasonic Mode
      8. 7.4.8  Output Discharge
      9. 7.4.9  Undervoltage Lockout
      10. 7.4.10 Current Limit Operation
      11. 7.4.11 Output Short-to-Ground Protection
      12. 7.4.12 Thermal Shutdown
      13. 7.4.13 Power-Good Indication Status
    5. 7.5 Programming
      1. 7.5.1 Data Validity
      2. 7.5.2 START and STOP Conditions
      3. 7.5.3 Byte Format
      4. 7.5.4 Acknowledge (ACK) and Not Acknowledge (NACK)
      5. 7.5.5 Target Address and Data Direction Bit
      6. 7.5.6 Single Read and Write
      7. 7.5.7 Multi-Read and Multi-Write
    6. 7.6 Register Maps
      1. 7.6.1 DeviceID Register
      2. 7.6.2 CONFIG Register
      3. 7.6.3 VOUTFLOORSET Register
      4. 7.6.4 ILIMBSTSET Register
      5. 7.6.5 VOUTROOFSET Register
      6. 7.6.6 STATUS Register
      7. 7.6.7 ILIMPTSET Register
      8. 7.6.8 BSTLOOP Register
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 TLV61290 with 2.5V-4.35V VIN, 3.4V VOUT, 4A Output Current
        1. 8.2.1.1 Design Requirement
        2. 8.2.1.2 Detailed Design Parameters
          1. 8.2.1.2.1 Inductor Selection
          2. 8.2.1.2.2 Output Capacitor
          3. 8.2.1.2.3 Input Capacitor
          4. 8.2.1.2.4 Checking Loop Stability
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
      3. 8.4.3 Thermal Information
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1.     79

7.4.10 Current Limit Operation

The TLV61290 device features an average inductor current limit scheme.

In dc/dc boost mode, the TLV61290 device employs a current limit detection scheme in which the voltage drop across the synchronous rectifier is sensed during the off-time. The average current limit threshold is set via an I2C register. The default average current limit in boost mode is approximately 8A, when it hits the current limit, the device works in constant current mode. The output voltage is reduced as the power stage of the device operates in a constant current mode.

The output voltage is reduced as the power stage of the device operates in a constant current mode. The maximum continuous output current (IOUT(max)), before entering current limit (CL) operation, is defined by Equation 6.

Equation 6. IOUTmax=ILIMIT×VINVOUT×η

where

  • η is the efficiency
  • IOUT(max) is the maximum output current
  • ILIMIT is the current limit of the input side
  • VIN is the input voltage
  • VOUT is the output voltage

The output current, IOUT, is the average of the rectifier ripple current waveform. When the load current is increased such that the trough is above the current limit threshold, the off-time is increased to allow the current to decrease this threshold before the next on-time begins (so called frequency fold-back mechanism). When the current limit is reached the output voltage decreases during further load increase.

TLV61290 Operation scheme of current limit in dc/dc boost modeFigure 7-5 Operation scheme of current limit in dc/dc boost mode

In true bypass mode, the TLV61290 device employs a hiccup protection scheme. The current limit threshold is set using an I2C register. The default current limit in true bypass mode is 10A, when it hits the current limit, the device turns off the bypass FET after a small delay, ca. 200ns, then the device enters into hiccup mode. Once the short-circuit is released, the TLV61290 goes through the soft start-up again.

TLV61290 Operation scheme of current limit in true bypass modeFigure 7-6 Operation scheme of current limit in true bypass mode