SLVSHH0 June   2026 TPS61290

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  Output Discharge
      8. 7.4.8  Undervoltage Lockout
      9. 7.4.9  Current Limit Operation
      10. 7.4.10 Output Short-to-Ground Protection
      11. 7.4.11 Thermal Shutdown
      12. 7.4.12 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 TPS61290x With 2.5V – 4.35V VIN, 3.4V VOUT, 6A 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
      2. 9.2.2 TPS61290x With 2.5V – 4.85V VIN, 5.0V VOUT, 4A Output Current
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 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.     81

7.4.2 Operation Mode Setting

The TPS61290x device can be configured (through Section 7.6.5) to select the operating mode of the device.

When the EN pin is set to logic high, ENABLE bit (CONFIG[5:6]) = 01 (default value), the device enters normal mode (that is, automatic boost/bypass mode) and enables the output voltage to remain above a pre-defined target voltage.

When the EN pin is set to logic high, ENABLE bit (CONFIG[5:6]) = 10, the device enters forced bypass mode. In this mode, the synchronous rectifier is current limited to ca. 8A (programmable through I2C) allowing an external load (for example audio amplifier) to be powered with a restricted supply. The output voltage is slightly reduced due to voltage drop across the bypass MOSFET. The device consumes only a standby current of 23µA (typical).

When the EN pin is set to logic high, and ENABLE bit (CONFIG[5:6]) = 11 forces the device in shutdown mode, but I2C block works, with a standby current of typically 16µA. In this mode, true load disconnect between the battery and load prevents current flow from VIN to VOUT, as well as reverse current flow from VOUT to VIN.

When the EN pin is set to logic low forces the device in shutdown mode (regardless of what ENABLE bit is), with a shutdown current of typically 0.8µA. In this mode, true load disconnect between the battery and load prevents current flow from VIN to VOUT, as well as reverse current flow from VOUT to VIN.

Table 7-3 Mode of Operation
EN PINENABLE BITOPERATION MODE
LowxxShutdown mode. True load disconnection and no VOUT. The device shutdown current is approximately 0.8μA typical.
High11I2C shutdown mode. Power stage is turned off and no VOUT, but I2C is active. True load disconnection. The device standby current in this mode is approximately 16μA typical.
High10Forced bypass mode. VOUT follows VIN. The device standby current is approximately 23μA typical.
High00/01 (default 01)Automatic boost/bypass mode. In boost mode, VOUT = VOUT_TAR (default 3.4V). In bypass mode, VOUT follows VIN.