SLVS372C June 2001 – October 2015 TPS60240 , TPS60241 , TPS60242 , TPS60243
PRODUCTION DATA.
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TPS6024x is a switched capacitor voltage converter for VCO and PLL applications providing low noise conversion and tight tolerances. It supports regulated output voltages of 2.7 V, 3 V and 3.3 V from a 1.8-V to 5.5-V input voltage range. The TPS60241 generates 5-V output voltage from an 2.7-V to 5.5-V input voltage range.
8.2 Typical Applications
8.2.1 5-V Low-Noise VCO Supply from 3.3-V Input
Figure 4. 5-V Low-Noise VCO Supply from 3.3-V Input
8.2.1.1 Design Requirements
The complete charge pump circuitry requires no inductors and only four small ceramic capacitors.
8.2.1.2 Detailed Design Procedure
8.2.1.2.1 Output Voltage Ripple
The output voltage ripple depends on the capacitors used. Table 1 shows the dependence between output voltage ripple and capacitor selection.
Table 1. Output Voltage Ripple and Capacitor Selection(1)
| CI | CO | C1 | C2 | OUTPUT VOLTAGE RIPPLE [µVrms] |
|---|---|---|---|---|
| 1 µF | 1 µF | 1 µF | 1 µF | 288 |
| 2.2 µF | 2.2 µF | 1 µF | 1 µF | 212 |
| 4.7 µF | 4.7 µF | 1 µF | 1 µF | 183 |
| 4.7 µF | 1 µF | 1 µF | 1 µF | 272 |
| 1 µF | 4.7 µF | 1 µF | 1 µF | 185 |
For the best output ripple performance, low-ESR ceramic capacitors are recommended (see Table 2).
Table 2. Recommended Capacitors
| PART | MANUFACTURER | PART NUMBER | VALUE | TOLERANCE | DIELECTRIC MATERIAL | PACKAGE | RATED VOLTAGE |
|---|---|---|---|---|---|---|---|
| CI | Taiyo Yuden | LMK212BJ105KG–T | 1 µF | 10% | X7R | 0805 | 10 |
| TDK | C2012X5R0J475K | 4.7 µF | 10% | X5R | 0805 | 6.3 | |
| CO | Taiyo Yuden | LMK212BJ105KG–T | 1 µF | 10% | X7R | 0805 | 10 |
| TDK | C2012X5R0J475K | 4.7 µF | 10% | X5R | 0805 | 6.3 | |
| C1, C2 | Taiyo Yuden | LMK212BJ105KG–T | 1 µF | 10% | X7R | 0805 | 10 |
| CF | Taiyo Yuden | LMK212BJ105KG–T | 1 µF | 10% | X7R | 0805 | 10 |
8.2.1.3 Application Curves
Figure 5. TPS60240 Efficiency vs Input Voltage
Figure 7. TPS60242 Efficiency vs Input Voltage
Figure 9. TPS60240 Efficiency vs Output Voltage
Figure 11. TPS60242 Efficiency vs Output Voltage
Figure 13. TPS60240 Output Voltage vs Input Voltage
Figure 15. TPS60242 Output Voltage vs Input Voltage
Figure 17. TPS60240 Output Voltage vs Output Current
Figure 19. TPS60242 Output Voltage vs Output Current
Figure 21. TPS60241 Output Voltage vs Free-Air Temperature
Figure 23. TPS60240 Maximum Output Current vs Input Voltage
Figure 25. TPS60242 Maximum Output Current vs Input Voltage
Figure 27. Load Transient Response
Figure 29. Line Transient Response
| NOTE: Scope triggered by voltage at flying capacitors, noise removed by averaging function and bandwidth limit 20 MHz. |
Output Voltage Ripple vs Time
Figure 6. TPS60241 Efficiency vs Input Voltage
Figure 8. TPS60243 Efficiency vs Input Voltage
Figure 10. TPS60241 Efficiency vs Output Voltage
Figure 12. TPS60243 Efficiency vs Output Voltage
Figure 14. TPS60241 Output Voltage vs Input Voltage
Figure 16. TPS60243 Output Voltage vs Input Voltage
Figure 18. TPS60241 Output Voltage vs Output Current
Figure 20. TPS60243 Output Voltage vs Output Current
Figure 22. TPS60241 Output Noise Voltage vs Output Current
Figure 24. TPS60241 Maximum Output Current vs Input Voltage
Figure 26. TPS60243 Maximum Output Current vs Input Voltage
Figure 28. Start-Up Timing
Figure 30. TPS60241 Noise Voltage Spectrum
8.2.2 2-V to 3.3-V Low-Noise Converter
Standard application as a low noise boost converter. The device generates a regulated output voltage of 3.3 V from a 2-V supply with only 4 external 1-µF ceramic capacitors.
Figure 32. 2-V to 3.3-V Low-Noise Converter