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Using the TPS6102x with Ceramic Output Caps

Using the TPS6102x with Ceramic Output Caps. Datasheet Requires ESR above 30 mOhm. Test Results. TPS61020EVM-025 evaluated with a DC load and with a load transient Evaluated with both recommended output capacitors and non-recommend output ceramic capacitors

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Using the TPS6102x with Ceramic Output Caps

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  1. Using the TPS6102x with Ceramic Output Caps

  2. Datasheet Requires ESR above 30 mOhm

  3. Test Results • TPS61020EVM-025 evaluated with a DC load and with a load transient • Evaluated with both recommended output capacitors and non-recommend output ceramic capacitors • Test conditions: 2.5V in, 3.3V out, DC load 500 mA, transient load 200 mA to 500 mA • Slides 4-7 are the standard EVM circuit with the proper output capacitor, while slides 8-12 use only ceramic

  4. Output Voltage Ripple (DC Coupled)

  5. Output Voltage Ripple (AC Coupled)

  6. Transient Response (DC Coupled)

  7. Transient Response (AC Coupled)

  8. EVM Modified by Replacing C3 with 22uF ceramic Insert 22uF ceramic

  9. Output Voltage Ripple (DC Coupled)

  10. Output Voltage Ripple (AC Coupled)

  11. Transient Response (DC Coupled)

  12. Transient Response (AC Coupled)

  13. Conclusion • TPS6102x is unstable with ceramic output capacitors, which have low ESR • Shows low frequency oscillation/ripple • Performance is normal when output capacitors with sufficient ESR are used • If ceramic output capacitors are required: • Use the newer, smaller TPS61200 • Use ceramic output capacitors with a discrete 30 mOhm resistors in series to give them the needed ESR

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