SLVSCM5A September   2014  – November 2016 TPS562209 , TPS563209

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics TPS562209
    7. 6.7 Typical Characteristics TPS563209
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 The Adaptive On-Time Control and PWM Operation
      2. 7.3.2 Soft Start and Pre-Biased Soft Start
      3. 7.3.3 Current Protection
      4. 7.3.4 Over Voltage Protection
      5. 7.3.5 UVLO Protection
      6. 7.3.6 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Forced CCM Operation
      3. 7.4.3 Standby Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 TPS562209 4.5-V to 17-V Input, 1.05-V Output Converter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Output Voltage Resistors Selection
          2. 8.2.1.2.2 Output Filter Selection
          3. 8.2.1.2.3 Input Capacitor Selection
          4. 8.2.1.2.4 Bootstrap Capacitor Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 TPS563209 4.5-V to 17-V Input, 1.05-V Output Converter
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedures
          1. 8.2.2.2.1 Output Filter Selection
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Links
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

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 TPS562209 and TPS563209 are typically used as step down converters, which convert a voltage from 4.5V - 17V to a lower voltage. Webench software is available to aid in the design and analysis of circuits

8.2 Typical Applications

8.2.1 TPS562209 4.5-V to 17-V Input, 1.05-V Output Converter

TPS562209 TPS563209 App_SCH1_slvsCM5.gif Figure 20. TPS562209 1.05V/2A Reference Design

8.2.1.1 Design Requirements

To begin the design process, you must know a few application parameters:

Table 1. Design Parameters

PARAMETER VALUE
Input voltage range 4.5 V to 17 V
Output voltage 1.05 V
Output current 2 A
Output voltage ripple 20 mVpp

8.2.1.2 Detailed Design Procedure

8.2.1.2.1 Output Voltage Resistors Selection

The output voltage is set with a resistor divider from the output node to the VFB pin. It is recommended to use 1% tolerance or better divider resistors. Start by using Equation 1 to calculate VOUT.

To improve efficiency at very light loads consider using larger value resistors, too high of resistance will be more susceptible to noise and voltage errors from the VFB input current will be more noticeable.

Equation 1. TPS562209 TPS563209 eq1_vout_slvsCM5.gif

8.2.1.2.2 Output Filter Selection

The LC filter used as the output filter has double pole at:

Equation 2. TPS562209 TPS563209 Eq03_FP_slvscm5.gif

At low frequencies, the overall loop gain is set by the output set-point resistor divider network and the internal gain of the device. The low frequency phase is 180 degrees. At the output filter pole frequency, the gain rolls off at a –40 dB per decade rate and the phase drops rapidly. D-CAP2™ introduces a high frequency zero that reduces the gain roll off to –20 dB per decade and increases the phase to 90 degrees one decade above the zero frequency. The inductor and capacitor for the output filter must be selected so that the double pole of Equation 2 is located below the high frequency zero but close enough that the phase boost provided be the high frequency zero provides adequate phase margin for a stable circuit. To meet this requirement use the values recommended in Table 2.

Table 2. Recommended Component Values

OUTPUT VOLTAGE
(V)		 R2
(kΩ)		 R3
(kΩ)		 L1 (µH) C5 + C6 (µF)
MIN TYP MAX
1 3.09 10.0 1.5 2.2 4.7 20 - 68
1.05 3.74 10.0 1.5 2.2 4.7 20 - 68
1.2 5.76 10.0 1.5 2.2 4.7 20 - 68
1.5 9.53 10.0 1.5 2.2 4.7 20 - 68
1.8 13.7 10.0 1.5 2.2 4.7 20 - 68
2.5 22.6 10.0 2.2 3.3 4.7 20 - 68
3.3 33.2 10.0 2.2 3.3 4.7 20 - 68
5 54.9 10.0 3.3 4.7 4.7 20 - 68
6.5 75 10.0 3.3 4.7 4.7 20 - 68

The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 3, Equation 4 and Equation 5. The inductor saturation current rating must be greater than the calculated peak current and the RMS or heating current rating must be greater than the calculated RMS current.

Use 650 kHz for fSW. Make sure the chosen inductor is rated for the peak current of Equation 4 and the RMS current of Equation 5.

Equation 3. TPS562209 TPS563209 Eq04_Ilpp_slvscm5.gif
Equation 4. TPS562209 TPS563209 Eq05_Ipeak_slvscm5.gif
Equation 5. TPS562209 TPS563209 Eq06_ILO_slvscm5.gif

For this design example, the calculated peak current is 2.34 A and the calculated RMS current is 2.01 A. The inductor used is a TDK CLF7045T-2R2N with a peak current rating of 5.5-A and an RMS current rating of 4.3-A

The capacitor value and ESR determines the amount of output voltage ripple. The TPS562209 is intended for use with ceramic or other low ESR capacitors. Recommended values range from 20µF to 68µF. Use Equation 6 to determine the required RMS current rating for the output capacitor.

Equation 6. TPS562209 TPS563209 Eq07_ICO_slvscm5.gif

For this design two TDK C3216X5R0J226M 22µF output capacitors are used. The typical ESR is 2 mΩ each. The calculated RMS current is 0.199A and each output capacitor is rated for 4A.

8.2.1.2.3 Input Capacitor Selection

The TPS562209 and TPS563209 require an input decoupling capacitor and a bulk capacitor is needed depending on the application. A ceramic capacitor over 10 µF is recommended for the decoupling capacitor. An additional 0.1 µF capacitor (C3) from pin 3 to ground is optional to provide additional high frequency filtering. The capacitor voltage rating needs to be greater than the maximum input voltage.

8.2.1.2.4 Bootstrap Capacitor Selection

A 0.1µF ceramic capacitor must be connected between the VBST to SW pin for proper operation. It is recommended to use a ceramic capacitor.

8.2.1.3 Application Curves

TPS562209 TPS563209 D023_SLVSCM5.gif Figure 21. TPS562209 Efficiency
TPS562209 TPS563209 D025_SLVSCM5.gif Figure 23. TPS562209 Load Regulation, VI = 5 V
TPS562209 TPS563209 D028_SLVSCM5.gif Figure 25. TPS562209 Line Regulation
TPS562209 TPS563209 Vout_ripple_a_2209_slvsCM5.gif Figure 27. TPS562209 Output Voltage Ripple
TPS562209 TPS563209 start_vin_2209_slvsCM5.gif Figure 29. TPS562209 Start Up Relative to VI
TPS562209 TPS563209 stop_vin_2209_slvsCM5.gif Figure 31. TPS562209 Shut Down Relative to VI
TPS562209 TPS563209 D024_SLVSCM5.gif Figure 22. TPS562209 Light Load Efficiency
TPS562209 TPS563209 D026_SLVSCM5.gif Figure 24. TPS562209 Load Regulation, VI = 12 V
TPS562209 TPS563209 Vin_ripple_2209_slvsCM5.gif Figure 26. TPS562209 Input Voltage Ripple
TPS562209 TPS563209 transient1_2209_slvsCM5.gif Figure 28. TPS562209 Transient Response
TPS562209 TPS563209 start_en_2209_slvsCM5.gif Figure 30. TPS562209 Start Up Relative to EN
TPS562209 TPS563209 stop_en_2209_slvsCM5.gif Figure 32. TPS562209 Shut Down Relative to EN

8.2.2 TPS563209 4.5-V to 17-V Input, 1.05-V Output Converter

TPS562209 TPS563209 App_SCH2_slvsCM5.gif Figure 33. TPS563209 1.05V/3A Reference Design

8.2.2.1 Design Requirements

To begin the design process, the user must know a few application parameters:

Table 3. Design Parameters

PARAMETER VALUE
Input voltage range 4.5 V to 17 V
Output voltage 1.05 V
Output current 3 A
Output voltage ripple 20 mVpp

8.2.2.2 Detailed Design Procedures

The detailed design procedure for TPS563209 is the same as for TPS562209 except for inductor selection.

8.2.2.2.1 Output Filter Selection

Table 4. Recommended Component Values

OUTPUT VOLTAGE
(V)		 R2
(kΩ)		 R3
(kΩ)		 L1 (µH) C5 +C6 + C7 (µF)
MIN TYP MAX
1 3.09 10.0 1.0 1.5 4.7 20 - 68
1.05 3.74 10.0 1.0 1.5 4.7 20 - 68
1.2 5.76 10.0 1.0 1.5 4.7 20 - 68
1.5 9.53 10.0 1.0 1.5 4.7 20 - 68
1.8 13.7 10.0 1.5 2.2 4.7 20 - 68
2.5 22.6 10.0 1.5 2.2 4.7 20 - 68
3.3 33.2 10.0 1.5 2.2 4.7 20 - 68
5 54.9 10.0 2.2 3.3 4.7 20 - 68
6.5 75 10.0 2.2 3.3 4.7 20 - 68

The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 7, Equation 8 and Equation 9. The inductor saturation current rating must be greater than the calculated peak current and the RMS or heating current rating must be greater than the calculated RMS current. Use 650 kHz for ƒSW.

Use 650 kHz for ƒSW. Make sure the chosen inductor is rated for the peak current of Equation 8 and the RMS current of Equation 9.

Equation 7. TPS562209 TPS563209 eq4_IIpp_slvscb0.gif
Equation 8. TPS562209 TPS563209 eq5_IIpeak_slvscb0.gif
Equation 9. TPS562209 TPS563209 eq6_ILO_slvscb0.gif

For this design example, the calculated peak current is 3.505 A and the calculated RMS current is 3.014 A. The inductor used is a TDK CLF7045T-1R5N with a peak current rating of 7.3-A and an RMS current rating of 4.9-A

The capacitor value and ESR determines the amount of output voltage ripple. The TPS563209 is intended for use with ceramic or other low ESR capacitors. Recommended values range from 20µF to 68µF. Use Equation 6 to determine the required RMS current rating for the output capacitor.

Equation 10. TPS562209 TPS563209 Eq07_ICO_slvscm5.gif

For this design three TDK C3216X5R0J226M 22µF output capacitors are used. The typical ESR is 2 mΩ each. The calculated RMS current is 0.292A and each output capacitor is rated for 4A.

8.2.2.3 Application Curves

TPS562209 TPS563209 D019_SLVSCM5.gif Figure 34. TPS563209 Efficiency
TPS562209 TPS563209 D021_SLVSCM5.gif Figure 36. TPS563209 Load Regulation, VI = 5 V
TPS562209 TPS563209 D020_SLVSCM5.gif Figure 35. TPS563209 Light Load Efficiency
TPS562209 TPS563209 D022_SLVSCM5.gif Figure 37. TPS563209 Load Regulation, VI = 12 V
TPS562209 TPS563209 D029_SLVSCM5.gif Figure 38. TPS563209 Line Regulation
TPS562209 TPS563209 Vout_ripple_b_3209_slvsCM5.gif Figure 40. TPS563209 Output Voltage Ripple
TPS562209 TPS563209 start_vin_3209_slvsCM5.gif Figure 42. TPS563209 Start Up Relative to VI
TPS562209 TPS563209 stop_vin_3209_slvsCM5.gif Figure 44. TPS563209 Shut Down Relative to VI
TPS562209 TPS563209 Vin_ripple_3209_slvsCM5.gif Figure 39. TPS563209 Input Voltage Ripple
TPS562209 TPS563209 transient1_3209_slvsCM5.gif Figure 41. TPS563209 Transient Response
TPS562209 TPS563209 start_en_3209_slvsCM5.gif Figure 43. TPS563209 Start Up Relative to EN
TPS562209 TPS563209 stop_en_3209_slvsCM5.gif Figure 45. TPS563209 Shut Down Relative to EN