SLVS815D January   2008  – October 2016 TPS62560 , TPS62561 , TPS62562


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Dynamic Voltage Positioning
      2. 8.3.2 Undervoltage Lockout
      3. 8.3.3 Mode Selection
      4. 8.3.4 Enable
      5. 8.3.5 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Soft-Start
      2. 8.4.2 Power-Save Mode
        1. 100% Duty-Cycle Low-Dropout Operation
        2. Short-Circuit Protection
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. Output Voltage Setting
        2. Output Filter Design (inductor and Output Capacitor)
          1. Inductor Selection
          2. Output Capacitor Selection
          3. Input Capacitor Selection
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9 Application and Implementation


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.

9.1 Application Information

The TPS6256x devices are high-efficiency synchronous step-down DC–DC converter featuring power-save mode or 2.25-MHz fixed frequency operation.

9.2 Typical Application

TPS62560 TPS62561 TPS62562 front_typ_app_lvs815.gif Figure 6. TPS62560DRV Adjustable

9.2.1 Design Requirements

The TPS6256x is a highly integrated DC/DC converter. The output voltage is set with an external voltage divider for the adjustable output voltage version. The output voltage is fixed to 1.8V for the TPS62562. For proper operation a input- and output capacitor and an inductor is required. Table 2 shows the components used for the application characteristic curves.

9.2.2 Detailed Design Procedure Output Voltage Setting

For adjustable output voltage versions, the output voltage can be calculated by Equation 2 with the internal reference voltage VREF = 0.6 V typically.

Equation 2. TPS62560 TPS62561 TPS62562 inl1_vout_lvs815.gif

To minimize the current through the feedback divider network, R2 should be 180 kΩ or 360 kΩ. The sum of R1 and R2 should not exceed ~1 MΩ, to keep the network robust against noise. An external feed-forward capacitor C1 is required for optimum load transient response. The value of C1 should be in the range between 22 pF and 33 pF.

In case of using the fixed output voltage version (TPS62562), Vout has to be connected to the feedback pin FB.

Route the FB line away from noise sources, such as the inductor or the SW line. Output Filter Design (inductor and Output Capacitor)

The TPS62560 is designed to operate with inductors in the range of 1.5 μH to 4.7 μH and with output capacitors in the range of 4.7 μF to 22 μF. The part is optimized for operation with a 2.2-μH inductor and 10-μF output capacitor.

Larger or smaller inductor values can be used to optimize the performance of the device for specific operation conditions. For stable operation, the L and C values of the output filter may not fall below 1 μH effective inductance and 3.5 μF effective capacitance. Inductor Selection

The inductor value has a direct effect on the ripple current. The selected inductor must be rated for its dc resistance and saturation current. The inductor ripple current (ΔIL) decreases with higher inductance and increases with higher VIN or VOUT.

The inductor selection also impacts the output voltage ripple in PFM mode. Higher inductor values lead to lower output voltage ripple and higher PFM frequency; lower inductor values lead to a higher output voltage ripple but lower PFM frequency.

Equation 3 calculates the maximum inductor current in PWM mode under static load conditions. The saturation current of the inductor should be rated higher than the maximum inductor current as calculated with Equation 4. This is recommended because during heavy load transients the inductor current rises above the calculated value.

Equation 3. TPS62560 TPS62561 TPS62562 q3_delta_lvs763_.gif
Equation 4. TPS62560 TPS62561 TPS62562 q4_ilmax_lvs763.gif


  • f = Switching frequency (2.25 MHz, typical)
  • L = Inductor value
  • ΔIL = Peak-to-peak inductor ripple current
  • ILmax = Maximum inductor current

A more conservative approach is to select the inductor current rating just for the switch current limit ILIMF of the converter.

Accepting larger values of ripple current allows the use of lower inductance values, but results in higher output voltage ripple, greater core losses, and lower output current capability.

The total losses of the coil have a strong impact on the efficiency of the dc/dc conversion and consist of both the losses in the dc resistance (R(DC)) and the following frequency-dependent components:

  • The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
  • Additional losses in the conductor from the skin effect (current displacement at high frequencies)
  • Magnetic field losses of the neighboring windings (proximity effect)
  • Radiation losses

Table 1. List of Inductors

2,5 × 2 × 1 max 2 MIPS2520D2R2 FDK
2,5 × 2 × 1,2 max 2 MIPSA2520D2R2 FDK
2,5 × 2 × 1 max 2.2 KSLI-252010AG2R2 Hitachi Metals
2,5 × 2 × 1,2 max 2.2 LQM2HPN2R2MJ0L Murata
3 × 3 × 1,5 max 2.2 LPS3015 2R2 Coilcraft Output Capacitor Selection

The advanced fast-response voltage-mode control scheme of the TPS62560 allows the use of tiny ceramic capacitors. Ceramic capacitors with low ESR values have the lowest output voltage ripple and are recommended. The output capacitor requires either an X7R or X5R dielectric. Y5V and Z5U dielectric capacitors, aside from their wide variation in capacitance over temperature, become resistive at high frequencies.

At nominal load current, the device operates in PWM mode, and the RMS ripple current is calculated by Equation 5:

Equation 5. TPS62560 TPS62561 TPS62562 q3_irms_lvs815.gif

At nominal load current, the device operates in PWM mode, and the overall output voltage ripple is the sum of the voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and discharging the output capacitor shown in Equation 6:

Equation 6. TPS62560 TPS62561 TPS62562 q4_dvout_lvs815.gif

At light load currents, the converter operates in power-save mode, and the output voltage ripple is dependent on the output capacitor and inductor values. Larger output capacitor and inductor values minimize the voltage ripple in PFM mode and tighten dc output accuracy in PFM mode. Input Capacitor Selection

An input capacitor is required for best input voltage filtering and minimizing the interference with other circuits caused by high input voltage spikes. For most applications, a 4.7-μF to 10-μF ceramic capacitor is recommended. Because a ceramic capacitor loses up to 80% of its initial capacitance at 5 V, it is recommended that 10-μF input capacitors be used for input voltages > 4.5 V. The input capacitor can be increased without any limit for better input voltage filtering. Take care when using only small ceramic input capacitors. When a ceramic capacitor is used at the input and the power is being supplied through long wires, such as from a wall adapter, a load step at the output or VIN step on the input can induce ringing at the VIN terminal. This ringing can couple to the output and be mistaken as loop instability or could even damage the part by exceeding the maximum ratings.

Table 2. List of Capacitors(1)

4.7 μF GRM188R60J475K 0603—1,6 × 0,8 × 0,8 mm Murata
10 μF GRM188R60J106M69D 0603—1,6 × 0,8 × 0,8 mm Murata

9.2.3 Application Curves

TPS62560 TPS62561 TPS62562 g002_lvs815.gif Figure 7. Efficiency vs Output Current
TPS62560 TPS62561 TPS62562 eff_33_vin_lvs763.gif Figure 9. Efficiency vs Output Current
TPS62560 TPS62561 TPS62562 g004_lvs815.gif Figure 11. Efficiency vs Output Current
TPS62560 TPS62561 TPS62562 tc_pwm18_lvs763.gif Figure 13. Typical Operation - PWM Mode
TPS62560 TPS62561 TPS62562 tc_tr_pwpf_lvs763.gif Figure 15. Mode Pin Transition from PWM to PFM MODE at Light Load
TPS62560 TPS62561 TPS62562 tc_fpwm1_lvs763.gif Figure 17. Forced PWM Load Transient
TPS62560 TPS62561 TPS62562 tc_pfm1_lvs763.gif Figure 19. PFM Load Transient
TPS62560 TPS62561 TPS62562 tc_pflotr1_lvs763.gif Figure 21. PFM Load Transient
TPS62560 TPS62561 TPS62562 tc_pflotr3_lvs763.gif Figure 23. PFM Load Transient
TPS62560 TPS62561 TPS62562 tc_pflotr5_lvs763.gif Figure 25. PFM Load Transient
TPS62560 TPS62561 TPS62562 tc_litr2_lvs763.gif Figure 27. PWM Line Transient
TPS62560 TPS62561 TPS62562 tc_pfm_rip_lvs763.gif Figure 29. Typical Operation - PFM Mode
TPS62560 TPS62561 TPS62562 g003_lvs815.gif Figure 8. Efficiency vs Output Current
TPS62560 TPS62561 TPS62562 eff_33_gnd_lvs763.gif Figure 10. Efficiency vs Output Current
TPS62560 TPS62561 TPS62562 g005_lvs815.gif Figure 12. Efficiency vs Output Current
TPS62560 TPS62561 TPS62562 tc_tr_pfpw_lvs763.gif Figure 14. Mode Pin Transition from PFM to FORCED PWM Mode at Light Load
TPS62560 TPS62561 TPS62562 tc_st_vo18_lvs763.gif Figure 16. Start-UP Timing
TPS62560 TPS62561 TPS62562 tc_fpwm2_lvs763.gif Figure 18. Forced PWM Load Transient
TPS62560 TPS62561 TPS62562 tc_pfm2f_lvs763.gif Figure 20. PFM Load Transient
TPS62560 TPS62561 TPS62562 tc_pflotr2_lvs763.gif Figure 22. PFM Load Transient
TPS62560 TPS62561 TPS62562 tc_pflotr4_lvs763.gif Figure 24. PFM Load Transient
TPS62560 TPS62561 TPS62562 tc_litr1_lvs763.gif Figure 26. PFM Line Transient
TPS62560 TPS62561 TPS62562 tc_pfm18_lvs763.gif Figure 28. Typical Operation - PFM Mode

9.3 System Examples

TPS62560 TPS62561 TPS62562 s0364-01_lvs815.gif Figure 30. TPS62560 Adjustable 1.2-V Output
TPS62560 TPS62561 TPS62562 s0365-01_lvs815.gif Figure 31. TPS62560 Adjustable 1.5-V Output
TPS62560 TPS62561 TPS62562 s0366-01_lvs815.gif Figure 32. TPS62562 Fixed 1.8-V Output