SLVSHK8 December   2023 TPSM64406

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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 System Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Input Voltage Range (VIN1, VIN2)
      2. 7.3.2  Enable EN Pin and Use as VIN UVLO
      3. 7.3.3  CONFIG Device Configuration Pin
      4. 7.3.4  Adjustable Switching Frequency
      5. 7.3.5  Spread Spectrum
      6. 7.3.6  Adjustable Output Voltage (FB)
      7. 7.3.7  Input Capacitors
      8. 7.3.8  Output Capacitors
      9. 7.3.9  SYNC Allows Clock Synchronization and Mode Selection
      10. 7.3.10 Power-Good Output Voltage Monitoring
      11. 7.3.11 Bias Supply Regulator (VCC, VOSNS)
      12. 7.3.12 Overcurrent Protection (OCP)
      13. 7.3.13 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
  9. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Design 1 – High-efficiency Dual Output 5 V at 3 A, 3.3 V at 3 A, Synchronous Buck Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Output Voltage Setpoint
          2. 8.2.1.2.2 Switching Frequency Selection
          3. 8.2.1.2.3 Input Capacitor Selection
          4. 8.2.1.2.4 Output Capacitor Selection
          5. 8.2.1.2.5 Other Considerations
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2 – High-efficiency 6 A Synchronous Buck Regulator for Industrial Applications
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Output Voltage Setpoint
          2. 8.2.2.2.2 Switching Frequency Selection
          3. 8.2.2.2.3 Input Capacitor Selection
          4. 8.2.2.2.4 Output Capacitor Selection
          5. 8.2.2.2.5 Other Connections
        3. 8.2.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Thermal Design and Layout
      2. 8.4.2 Layout Example
  10. 9 Custom Design With WEBENCH® Tools
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Development Support
        1. 10.1.2.1 Custom Design With WEBENCH® Tools
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Mechanical Data

Package Options

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

7.3.3 CONFIG Device Configuration Pin

Several features are included to simplify compliance with CISPR 25 and automotive EMI requirements. To reduce input capacitor ripple current and EMI filter size, the device can be configured to operate in a stack of either two, four, or six phases with corresponding phase shift interleave operation based on the number of phases. For example, in a 4-phase setup, a 90° out-of-phase clock output setup works well for cascaded, multichannel, or multiphase power stages. Resistor-adjustable switching frequency as high as 2.2 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications. Optional spread spectrum modulation further improves the EMI signature.

The CONFIG terminal is used to set up the device for either dual output or single output multiphase operation. The spread spectrum can also be turned on and off with different resistor values.

Table 7-1 RCONFIG Resistor Selection

RCONFIG (kΩ)

Mode

Spread Spectrum

0

Dual output

No

9.53

2 phase primary

No

19.1

4 phase primary

 No

29.4

6 phase primary

 No

41.2

Secondary

N/A

56.2

2 phase primary

Yes

73.2

4 phase primary

Yes

93.1

6 phase primary

Yes

121

Dual output

Yes

When configured in single output multiphase operation, the VOSNS2 pin becomes the output of the error amplifier (COMP) and a resistor and capacitor are needed at this pin to compensate the control loop. RC = 11 kΩ, CC = 2.2 nF can be used in initial evaluation for many designs. Increasing the resistance results in higher loop gain and tends to require proportionately larger output capacitors. Decreasing the capacitance increases the loop response of the device, resulting in faster transients but can lower phase margin at the cross-over frequency and can require adjustments to the output capacitance. Table 7-2 provides several settings for different output configurations.

Table 7-2 Typical Bill of Materials
MODE VOUT1 VOUT2 FREQUENCY COUT EACH PHASE CIN + CHF EACH PHASE RC CC
DUAL 3.3 V 5 V 500 kHz 47 + 22 µF 2 × 10 µF + 1 × 100 nF INTERNAL INTERNAL
DUAL 3.3 V 5 V 2100 kHz 2 × 22 µF 1 × 10 µF + 1 × 100 nF INTERNAL INTERNAL
SINGLE 3.3 V 3.3 V 500 kHz 47 + 22 µF 2 × 10 µF + 1 × 100 nF 11 kΩ 2.2 nF
SINGLE 5 V 5 V 2100 kHz 2 × 22 µF 1 × 10 µF + 1 × 100 nF 11 kΩ 2.2 nF
GUID-20231205-SS0I-J0CK-MK6H-CJR5CWVMTBZR-low.svg High-efficiency, Single Output 2-Phase Step-down Converter
GUID-20231205-SS0I-6CCN-JSV3-R4ZQQDVMCCGW-low.svg High-efficiency, Single Output 4-Phase Step-down Converter
GUID-20231205-SS0I-Z4W3-PNN8-8RCTCS0SXXDR-low.svg High-efficiency, Single Output 6-Phase Step-down Converter