SDAA379 June   2026 TPS62912

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2CMOS AVDD requirements
  6. 3TPS62912 Performance and Design Considerations
    1. 3.1 Steady-State Operation Performance
    2. 3.2 Output Voltage Ripple Performance With Long Cable
    3. 3.3 TPS62912 and LDO Performance Comparison in Actual Board Implementation
  7. 4Design Considerations
    1. 4.1 Measurement Spike Mitigation
    2. 4.2 Feedforward Capacitor for Enhanced Loop Response
  8. 5Conclusion
  9. 6Reference

Abstract

This paper presents a design for powering CMOS image sensors using the TI TPS6291X series buck converter. By employing the TPS6291X, the system eliminates the need for a dedicated linear and low-dropout regulator (LDO) while still delivering high power supply rejection ratio (PSRR) and low output voltage ripple to meet CMOS AVDD power supply requirements, thereby reducing overall system power consumption. The AVDD requirements of CMOS sensors are discussed, and the capability of the TPS6291X is validated through experimental results covering output ripple and load transient. Furthermore, design considerations for achieving LDO-equivalent performance with the TPS62912 are presented and compared against conventional designs.