SLVSLZ3 August   2026 TLV612901

PRODMIX  

  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 I2C Interface Timing Requirements
    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 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 Overvoltage Protection
      13. 7.4.13 Thermal Shutdown
      14. 7.4.14 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
  9. 8 Register Maps
    1. 8.1 DeviceID Register
    2. 8.2 CONFIG Register
    3. 8.3 VOUTFLOORSET Register
    4. 8.4 ILIMBSTSET Register
    5. 8.5 VOUTROOFSET Register
    6. 8.6 STATUS Register
    7. 8.7 ILIMPTSET Register
    8. 8.8 BSTLOOP Register
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 TLV612901 With 2.5V – 4.85V VIN, 5.0V VOUT, 3A Output Current
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection
          2. 9.2.1.2.2 Output Capacitor
          3. 9.2.1.2.3 Input Capacitor
          4. 9.2.1.2.4 Checking Loop Stability
        3. 9.2.1.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
      3. 9.4.3 Thermal Information
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1.     79

7.4.10 Current Limit Operation

The TLV612901 device features an average inductor current limit scheme.

In DC/DC boost mode, the TLV612901 device employs an average inductor current limit detection scheme and senses the voltage drop across the synchronous rectifier during the off-time. The average inductor current limit threshold can be set through an I2C register, and the default value is 8A (typical). When this current limit is reached, if the output current continues to increase, the TLV612901 reduces the output voltage while maintaining the inductor current at the current limit value.

Equation 6 calculates the maximum continuous output current (IOUT(max)) before entering current limit (CL).

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
TLV612901 Operation Scheme of Current Limit in DC/DC Boost ModeFigure 7-5 Operation Scheme of Current Limit in DC/DC Boost Mode

In bypass mode, the TLV612901 device is protected by a very fast current limit detection scheme. If the current in the bypass FET exceeds approximately 8A, the device turns off the bypass FET after a small delay, ca. 200ns. Then, the device cycles through a start-up procedure.

TLV612901 Operation Scheme of Current Limit in Bypass ModeFigure 7-6 Operation Scheme of Current Limit in Bypass Mode