SLVAFX0B October   2024  – March 2026 TLV702 , TLV703 , TLV755P , TPS74401 , TPS7A13 , TPS7A14 , TPS7A20 , TPS7A21 , TPS7A49 , TPS7A52 , TPS7A53 , TPS7A53B , TPS7A54 , TPS7A57 , TPS7A74 , TPS7A83A , TPS7A84A , TPS7A85A , TPS7A91 , TPS7A92 , TPS7A94 , TPS7A96 , TPS7H1111-SP

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction to Linear Regulator Turn-On Time
  5. 2What Impacts the LDO Rise Time?
    1. 2.1 Simple Use Cases
      1. 2.1.1 Case 1: LDO With an NR Filter But Without CFF Capacitance
      2. 2.1.2 Case 2: NR Filter With a CFF Capacitance
      3. 2.1.3 Fast-Charge Circuitry
      4. 2.1.4 Non-Preferred LDO Behavior
        1. 2.1.4.1 Applied Voltage Bias
        2. 2.1.4.2 Fast Charge Current Tolerance
        3. 2.1.4.3 Internal Error Amplifier Offset Voltage
        4. 2.1.4.4 Temperature Impacts the Fast-Charge Current Source
        5. 2.1.4.5 Error Amplifier Common Mode Voltage
        6. 2.1.4.6 Reference Voltage (VREF) Ramp Time Dominates the Turn-On Time
        7. 2.1.4.7 Start-Up During Dropout Mode
        8. 2.1.4.8 Large Values of COUT Induce Internal Current Limit
        9. 2.1.4.9 Limitations of Large-Signal LDO Bandwidth
    2. 2.2 Specific Use Cases and Examples
      1. 2.2.1 Case 3: Precision Voltage Reference With RNR/SS and Parallel IFC Fast Charge
      2. 2.2.2 Case 4: Precision Voltage Reference With IFC Fast Charge and No RNR/SS
      3. 2.2.3 Case 5: Precision Current Reference
      4. 2.2.4 Case 6: Soft-Start Timing
  6. 3System Considerations
    1. 3.1 Inrush Current Calculation
    2. 3.2 Inrush Current Analysis
    3. 3.3 Maximum Slew Rate
  7. 4Summary
  8. 5Conclusion
  9. 6References

6 References

  1. Lathi, B.P. (2000). Signal Processing and Linear Systems. Oxford University Press. ISBN 978-0195219173.
  2. Liu, Jason (2016). Various Applications for Voltage-Tracking LDO, application report. Texas Instruments.
  3. Nöbauer, G. T., & Moser, H. (2000). Analytical Approach to Temperature Evaluation in Bonding Wires and Calculation of Allowable Current, in IEEE Transactions on Advanced Packaging. IEEE Transactions on Advanced Packaging, 23(3), 426–435.
  4. Novak, I., Williams, K.B., Miller, J.R., Blando, G., and Shannon, N. (2011). DC and AC Bias Dependence of Capacitors Including Temperature Dependence. DesignCon East 2011.
  5. Texas Instruments (2025). AM64x SitaraTM Processors, datasheet.
  6. Texas Instruments (2025). TPS74401 3.0A, Ultra-LDO with Programmable Soft-Start, datasheet.
  7. Texas Instruments (2025). TPS748A 1.5A, Low-Dropout Linear Regulator With Programmable Soft-Start, datasheet.
  8. Texas Instruments (2024). TPS7A20 300mA, Ultra-Low-Noise, Low-IQ, High PSRR LDO, datasheet.
  9. Texas Instruments (2023). TPS7A96 2A, Ultra-Low Noise, Ultra-High PSRR, RF Voltage Regulator, datasheet.
  10. Texas Instruments (2023). TPS7H1111-SP and TPS7H1111-SEP 1.5A, Ultra-Low Noise, High PSRR Radiation Hardened Low Dropout (LDO) Linear Regulator, datasheet.
  11. Texas Instruments (2022). TPS7A57 5A, Low-VIN (0.7V), Low-Noise (2.1µVRMS), High-Accuracy (1%), Ultra-Low Dropout (LDO) Voltage Regulator, datasheet.
  12. Texas Instruments (2022). TPS7A74 1.5A, Low-Dropout Linear Regulator With Programmable Soft-Start, datasheet.
  13. Texas Instruments (2020). TPS7A84A 3A, High-Accuracy (0.75%), Low-Noise (4.4µVRMS) LDO Regulator, datasheet.
  14. Texas Instruments (2016). TPS7A91 1A, High-Accuracy, Low-Noise LDO Voltage Regulator, datasheet.
  15. Texas Instruments (2016), TPS7B4250-Q1 50mA 40V Voltage-Tracking LDO With 5mV Tracking Tolerance, datasheet.
  16. Texas Instruments (2015). TPS7A49 36V, 150mA, Ultralow-Noise, Positive Linear Regulator, datasheet.
  17. Thomas, R. E., Rosa, A. J., and Toussaint, G. J. (2012). The Analysis and Design of Linear Circuits (7th ed.). John Wiley & Sons. ISBN 978-1118065587.
  18. TI E2E™ forums.
  19. Traynham, Paul (2013). Overcoming Minimum Vdd Ramp Rate Limitation, application note. Renesas.
  20. Zhang, Penn, and Song, Jason (2020). Avoid Start-Up Overshoot of LDO, application report. Texas Instruments.
  21. Ziel, Stephen (2024). Tips, Tricks and Advanced Applications of Linear Regulators. Texas Instruments Power Supply Design Seminar SEM2600.